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warrenm/CommonProfile.metal

Created November 14, 2019 01:29
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SceneKit's CommonProfile Shader v2 (macOS 10.15)
Raw
CommonProfile.metal
////////////////////////////////////////////////
// CommonProfile Shader v2
#import <metal_stdlib>
using namespace metal;
#ifndef __SCNMetalDefines__
#define __SCNMetalDefines__
enum {
SCNVertexSemanticPosition,
SCNVertexSemanticNormal,
SCNVertexSemanticTangent,
SCNVertexSemanticColor,
SCNVertexSemanticBoneIndices,
SCNVertexSemanticBoneWeights,
SCNVertexSemanticTexcoord0,
SCNVertexSemanticTexcoord1,
SCNVertexSemanticTexcoord2,
SCNVertexSemanticTexcoord3,
SCNVertexSemanticTexcoord4,
SCNVertexSemanticTexcoord5,
SCNVertexSemanticTexcoord6,
SCNVertexSemanticTexcoord7
};
// This structure hold all the informations that are constant through a render pass
// In a shader modifier, it is given both in vertex and fragment stage through an argument named "scn_frame".
struct SCNSceneBuffer {
float4x4 viewTransform;
float4x4 inverseViewTransform; // transform from view space to world space
float4x4 projectionTransform;
float4x4 viewProjectionTransform;
float4x4 viewToCubeTransform; // transform from view space to cube texture space (canonical Y Up space)
float4x4 lastFrameViewProjectionTransform;
float4 ambientLightingColor;
float4 fogColor;
float3 fogParameters; // x:-1/(end-start) y:1-start*x z:exp
float2 inverseResolution;
float time;
float sinTime;
float cosTime;
float random01;
float motionBlurIntensity;
// new in macOS 10.12 and iOS 10
float environmentIntensity;
float4x4 inverseProjectionTransform;
float4x4 inverseViewProjectionTransform;
// new in macOS 10.13 and iOS 11
float2 nearFar; // x: near, y: far
float4 viewportSize; // xy:size, zw:origin
// new in macOS 10.14 and iOS 12
float4x4 inverseTransposeViewTransform;
// internal, DO NOT USE
float4 clusterScale; // w contains z bias
};
// In custom shaders or in shader modifiers, you also have access to node relative information.
// This is done using an argument named "scn_node", which must be a struct with only the necessary fields
// among the following list:
//
// float4x4 modelTransform;
// float4x4 inverseModelTransform;
// float4x4 modelViewTransform;
// float4x4 inverseModelViewTransform;
// float4x4 normalTransform; // This is the inverseTransposeModelViewTransform, need for normal transformation
// float4x4 modelViewProjectionTransform;
// float4x4 inverseModelViewProjectionTransform;
// float2x3 boundingBox;
// float2x3 worldBoundingBox;
#endif /* defined(__SCNMetalDefines__) */
//
// Utility
//
// Helper for compute kernels
#if defined(__METAL_IOS__)
#define RETURN_IF_OUTSIDE(dst) if ((index.x >= dst.get_width()) || (index.y >= dst.get_height())) return;
#define RETURN_IF_OUTSIDE3D(dst) if ((index.x >= dst.get_width()) || (index.y >= dst.get_height()) || (index.z >= dst.get_depth())) return;
#elif defined(__METAL_MACOS__) // On macOS, we use dispatchThread with won't execute on out of texture pixels
#define RETURN_IF_OUTSIDE(dst)
#define RETURN_IF_OUTSIDE3D(dst)
#endif
// Tool function
namespace scn {
// MARK: - Matrix/Vector utils
static inline float4 reduce_op(float4 d0, float4 d1)
{
d0.x = min(d0.x, d1.x);
d0.y = max(d0.y, d1.y);
d0.z += d1.z;
d0.w += d1.w;
return d0;
}
inline float vector_reduce_min(float4 v)
{
float2 min_lh = min(v.xy, v.zw);
return min(min_lh.x, min_lh.y);
}
inline float vector_reduce_max(float4 v)
{
float2 max_lh = max(v.xy, v.zw);
return max(max_lh.x, max_lh.y);
}
inline int vector_reduce_add(int4 v)
{
int2 add_lh = v.xy + v.zw;
return add_lh.x + add_lh.y;
}
inline float3x3 mat3(float4x4 mat4)
{
return float3x3(mat4[0].xyz, mat4[1].xyz, mat4[2].xyz);
}
inline float3 mat4_mult_float3_normalized(float4x4 matrix, float3 src)
{
float3 dst = src.xxx * matrix[0].xyz;
dst += src.yyy * matrix[1].xyz;
dst += src.zzz * matrix[2].xyz;
return normalize(dst);
}
inline float3 mat4_mult_float3(float4x4 matrix, float3 src)
{
float3 dst = src.xxx * matrix[0].xyz;
dst += src.yyy * matrix[1].xyz;
dst += src.zzz * matrix[2].xyz;
return dst;
}
inline float3 matrix_rotate(float4x4 mat, float3 dir)
{
return dir.xxx * mat[0].xyz +
dir.yyy * mat[1].xyz +
dir.zzz * mat[2].xyz;
}
inline float4 matrix_transform(float4x4 mat, float3 pos)
{
return pos.xxxx * mat[0] +
pos.yyyy * mat[1] +
pos.zzzz * mat[2] +
mat[3];
}
inline float3 quaternion_rotate_vector(float4 q, float3 v)
{
float3 t = 2.f * cross(q.xyz, v);
return v + q.w * t + cross(q.xyz, t);
}
// This seems unneeded with float. Maybe half ?
template <class T>
inline vec<T, 3> robust_normalize(vec<T, 3> v)
{
vec<T, 3> zero = 0.;
return all(v == zero) ? zero : normalize(v);
}
template <class T>
inline void generate_basis(vec<T, 3> inR, thread vec<T, 3> *outS, thread vec<T, 3> *outT)
{
// from http://marc-b-reynolds.github.io/quaternions/2016/07/06/Orthonormal.html
T x = -inR.x;
T y = inR.y;
T z = inR.z;
T sz = copysign(T(1.), z);
T a = y / (abs(z) + T(1.));
T b = y * a;
T c = x * a;
*outS = (vec<T, 3>){ z + sz * b, sz * c, x };
*outT = (vec<T, 3>){ c, T(1.) - b, -sz * y };
}
// MARK: - Blending operators
inline float3 blend_add(float3 base, float3 blend)
{
return min(base + blend, 1.0);
}
inline float3 blend_lighten(float3 base, float3 blend)
{
return max(blend, base);
}
inline float3 blend_screen(float3 base, float3 blend)
{
return (1.0 - ((1.0 - base) * (1.0 - blend)));
}
// MARK: - Math
inline half sq(half f) {
return f * f;
}
inline float sq(float f) {
return f * f;
}
inline float2 sincos(float angle) {
float cs;
float sn = ::sincos(angle, cs);
return float2(sn, cs);
}
// max error ~ 9.10-3
inline float acos_fast(float f) {
float x = abs(f);
float res = -0.156583f * x + M_PI_2_F;
res *= sqrt(1.0f - x);
return (f >= 0.f) ? res : M_PI_F - res;
}
inline float asin_fast(float f)
{
return M_PI_2_F - acos_fast(f);
}
// From Michal Drobot
inline float atan_fast(float inX)
{
float x = inX;
return x*(-0.1784f * abs(x) - 0.0663f * x * x + 1.0301f);
}
inline float atan2_fast(float y, float x)
{
float sx = x > 0.f ? -1.f : 1.f;
float abs_y = abs(y) + 1e-10f; // epsilon to prevent 0/0 condition
float r = (x + abs_y*sx) / (abs_y - x*sx);
float angle = sx * M_PI_4_F + M_PI_2_F;
angle += (0.1963f * r * r - 0.9817f) * r;
return y > 0.f ? angle : -angle;
}
// phi/theta are in the [0..1] range
template <class T>
inline vec<T, 3> cartesian_from_spherical(vec<T, 2> uv)
{
// do not use sinpi() waiting for
// <rdar://problem/28486742> sinpi(x) is 3x slower than sin(x * PI) on N71
T cos_phi;
T phi = uv.x * 2.0f * M_PI_F;
T sin_phi = ::sincos(phi, cos_phi);
T cos_theta;
T theta = uv.y * M_PI_F;
T sin_theta = ::sincos(theta, cos_theta);
return vec<T, 3>(cos_phi * sin_theta,
cos_theta,
-sin_phi * sin_theta);
}
inline float2 spherical_from_cartesian(float3 dir)
{
return float2( atan2(-dir.z, dir.x) * (0.5f * M_1_PI_F), acos(dir.y) * M_1_PI_F);
}
inline half2 spherical_from_cartesian(half3 dir)
{
return half2(atan2(-dir.z, dir.x) * 0.5h, acos(dir.y)) * M_1_PI_H;
}
inline float2 spherical_from_cartesian_fast(float3 dir)
{
return float2( atan2_fast(-dir.z, dir.x) * (0.5f * M_1_PI_F), acos_fast(dir.y) * M_1_PI_F);
}
inline half2 spherical_from_cartesian_fast(half3 dir)
{
return half2( atan2_fast(-dir.z, dir.x) * 0.5h, acos_fast(dir.y)) * M_1_PI_H;
}
#define dual_contract_factor 1.0
template <class T>
inline vec<T, 2> dual_paraboloid_from_cartesian(vec<T, 3> dir)
{
dir.xy /= abs(dir.z) + 1.0;
// dir.xy /= dual_contract_factor;
dir.y = 0.5 - dir.y * 0.5;
T s = sign(dir.z) * 0.25;
dir.x = s * (dir.x - 1.0) + 0.5;
return dir.xy;
}
// uv [0..1]
template <class T>
inline vec<T, 3> cartesian_from_dual_paraboloid(vec<T, 2> uv)
{
// put uv in [-1..1] for each side
T zside = 0.5 * sign(0.5 - uv.x);
uv.x = 1.0 - abs(4.0 * uv.x - 2.0); // [-1..1|1..-1]
uv.y = 1.0 - uv.y * 2.0;
T z = length_squared(uv); // * T(dual_contract_factor);
z = (1.0 - z) * zside;
return vec<T, 3>(uv.x, uv.y, z);
}
inline float reduce_min(float3 v) {
return min(v.x, min(v.y, v.z));
}
inline float reduce_min(float4 v) {
return min(min(v.x, v.y), min(v.z, v.w));
}
inline float reduce_max(float3 v) {
return max(v.x, max(v.y, v.z));
}
inline float reduce_max(float4 v) {
return max(max(v.x, v.y), max(v.z, v.w));
}
inline float3 randomSphereDir(float2 rnd)
{
float s = rnd.x * M_PI_F * 2.f;
float t = rnd.y * 2.f - 1.f;
return float3(sin(s), cos(s), t) / sqrt(1.f + t * t);
}
// from Sledgehammer slides
template <class T>
inline T interleaved_gradient_noise(vec<T, 2> pos)
{
vec<T, 3> magic( 0.06711056f, 0.00583715f, 52.9829189f );
return fract( magic.z * fract( dot( pos, magic.xy ) ) );
}
inline float3 hemisphere_reflect(float3 v, float3 nrm)
{
return v * sign(dot(v, nrm));
}
inline float3 randomHemisphereDir(float3 dir, float2 rnd)
{
return hemisphere_reflect(randomSphereDir( rnd ), dir);
}
inline void orthogonal_basis(float3 n, thread float3& xp, thread float3& yp)
{
// method 2a variant
float sz = n.z >= 0.f ? 1.f : -1.f;
float a = n.y / (1.f + abs(n.z));
float b = n.y * a;
float c = -n.x * a;
xp = float3(n.z + sz * b, sz * c, -n.x);
yp = float3(c, 1.f - b, -sz * n.y);
}
template <class U>
inline float2 normalized_coordinate(ushort2 index, U texture)
{
return float2(float(index.x) / float(texture.get_width() - 1),
float(index.y) / float(texture.get_height() - 1));
}
template <class U>
inline float2 normalized_coordinate(uint2 index, U texture)
{
return float2(float(index.x) / float(texture.get_width() - 1),
float(index.y) / float(texture.get_height() - 1));
}
template <class U>
inline half2 normalized_coordinate_half(uint2 index, U texture)
{
return half2(half(index.x) / half(texture.get_width() - 1),
half(index.y) / half(texture.get_height() - 1));
}
// MARK: Working with cube textures
template <class T>
inline vec<T, 3> cubemap_dir_from_sampleCoord(uint face, vec<T, 2> sampleCoord) // sampleCoord in [-1, 1]
{
switch(face) {
case 0: // +X
return vec<T, 3>( 1.0, -sampleCoord.y, -sampleCoord.x);
case 1: // -X
return vec<T, 3>(-1.0, -sampleCoord.y, sampleCoord.x);
case 2: // +Y
return vec<T, 3>(sampleCoord.x, 1.0, sampleCoord.y);
case 3: // -Y
return vec<T, 3>(sampleCoord.x, -1.0, -sampleCoord.y);
case 4: // +Z
return vec<T, 3>( sampleCoord.x, -sampleCoord.y, 1.0);
default: // -Z
return vec<T, 3>(-sampleCoord.x, -sampleCoord.y, -1.0);
}
}
// convert form [0..1] to [-1..1]
template <class T>
inline T signed_unit(T uv) {
return uv * 2.0 - 1.0;
}
// convert form [-1..1] to [0..1]
template <class T>
inline T unsigned_unit(T uv) {
return uv * 0.5 + 0.5;
}
template <class T>
inline vec<T, 3> cubemap_dir_from_uv(uint face, vec<T, 2> uv) // uv in [0, 1]
{
return cubemap_dir_from_sampleCoord(face, signed_unit(uv));
}
template <class T>
inline vec<T, 3> cubemap_dir_from_uv_unit(uint face, vec<T, 2> uv) // uv in [0, 1]
{
return normalize(cubemap_dir_from_uv(face, uv));
}
// MARK: - SIMD Extensions
inline vector_float2 barycentric_mix(vector_float2 __x, vector_float2 __y, vector_float2 __z, vector_float3 __t) { return __t.x * __x + __t.y * __y + __t.z * __z; }
inline vector_float3 barycentric_mix(vector_float3 __x, vector_float3 __y, vector_float3 __z, vector_float3 __t) { return __t.x * __x + __t.y * __y + __t.z * __z; }
inline vector_float4 barycentric_mix(vector_float4 __x, vector_float4 __y, vector_float4 __z, vector_float3 __t) { return __t.x * __x + __t.y * __y + __t.z * __z; }
static inline float rect(float2 lt, float2 rb, float2 uv)
{
float2 borders = step(lt, uv) * step(uv, rb);
return borders.x * borders.y;
}
inline half4 debugColorForCascade(int cascade)
{
switch (cascade) {
case 0:
return half4(1.h, 0.h, 0.h, 1.h);
case 1:
return half4(0.9, 0.5, 0., 1.);
case 2:
return half4(1., 1., 0., 1.);
case 3:
return half4(0., 1., 0., 1.);
default:
return half4(0., 0., 0., 1.);
}
}
inline half3 debugColorForFace(int count)
{
switch (count) {
case 0: return half3(1.0h, 0.1h, 0.1h);
case 1: return half3(0.1h, 1.0h, 1.0h);
case 2: return half3(0.1h, 1.0h, 0.1h);
case 3: return half3(1.0h, 0.1h, 1.0h);
case 4: return half3(0.1h, 0.1h, 1.0h);
default: return half3(1.0h, 1.0h, 0.1h);
}
}
inline half4 debugColorForCount(int count)
{
switch (count) {
case 0: return half4(0.0h, 0.0h, 0.0h, 1.h);
case 1: return half4(0.0h, 0.0h, 0.4h, 1.h);
case 2: return half4(0.0h, 0.0h, 0.9h, 1.h);
case 3: return half4(0.0h, 0.4h, 0.7h, 1.h);
case 4: return half4(0.0h, 0.9h, 0.4h, 1.h);
case 5: return half4(0.0h, 0.9h, 0.0h, 1.h);
case 6: return half4(0.4h, 0.7h, 0.0h, 1.h);
case 7: return half4(0.9h, 0.7h, 0.0h, 1.h);
default: return half4(1., 0., 0., 1.);
}
}
inline float grid(float2 lt, float2 rb, float2 gridSize, float thickness, float2 uv)
{
float insideRect = rect(lt, rb + thickness, uv);
float2 gt = thickness * gridSize;
float2 lines = step(abs(lt - fract(uv * gridSize)), gt);
return insideRect * (lines.x + lines.y);
}
inline float checkerboard(float2 gridSize, float2 uv)
{
float2 check = floor(uv * gridSize);
return step(fmod(check.x + check.y, 2.f), 0.f);
}
// MARK: - Colors
inline float luminance(float3 color)
{
// `color` assumed to be in the linear sRGB color space
// https://en.wikipedia.org/wiki/Relative_luminance
return color.r * 0.212671 + color.g * 0.715160 + color.b * 0.072169;
}
inline float srgb_to_linear(float c)
{
return (c <= 0.04045f) ? c / 12.92f : powr((c + 0.055f) / 1.055f, 2.4f);
}
inline half srgb_to_linear_fast(half c)
{
return powr(c, 2.2h);
}
inline half3 srgb_to_linear_fast(half3 c)
{
return powr(c, 2.2h);
}
inline half srgb_to_linear(half c)
{
// return (c <= 0.04045h) ? c / 12.92h : powr((c + 0.055h) / 1.055h, 2.4h);
return (c <= 0.04045h) ? (c * 0.0773993808h) : powr(0.9478672986h * c + 0.05213270142h, 2.4h);
}
inline float3 srgb_to_linear(float3 c)
{
return float3(srgb_to_linear(c.x), srgb_to_linear(c.y), srgb_to_linear(c.z));
}
inline float linear_to_srgb(float c)
{
return (c < 0.0031308f) ? (12.92f * c) : (1.055f * powr(c, 1.f/2.4f) - 0.055f);
}
inline float3 linear_to_srgb(float3 v) { // we do not saturate since linear extended values can be fed in
return float3(linear_to_srgb(v.x), linear_to_srgb(v.y), linear_to_srgb(v.z));
}
}
// MARK: GL helpers
template <typename T>
inline T dFdx(T v) {
return dfdx(v);
}
// Y is up in GL and down in Metal
template <typename T>
inline T dFdy(T v) {
return -dfdy(v);
}
// MARK: -
inline float4 texture2DProj(texture2d<float> tex, sampler smp, float4 uv)
{
return tex.sample(smp, uv.xy / uv.w);
}
inline half4 texture2DProj(texture2d<half> tex, sampler smp, float4 uv)
{
return tex.sample(smp, uv.xy / uv.w);
}
static constexpr sampler scn_shadow_sampler_rev_z = sampler(coord::normalized, filter::linear, mip_filter::none, address::clamp_to_zero, compare_func::less_equal);
static constexpr sampler scn_shadow_sampler_ord_z = sampler(coord::normalized, filter::linear, mip_filter::none, address::clamp_to_edge, compare_func::greater_equal);
#if defined(USE_REVERSE_Z) && USE_REVERSE_Z
static constexpr sampler scn_shadow_sampler = scn_shadow_sampler_rev_z;
#else
static constexpr sampler scn_shadow_sampler = scn_shadow_sampler_ord_z;
#endif
inline float shadow2D(sampler shadow_sampler, depth2d<float> tex, float3 uv)
{
return tex.sample_compare(shadow_sampler, uv.xy, uv.z);
}
inline float shadow2DProj(sampler shadow_sampler, depth2d<float> tex, float4 uv)
{
float3 uvp = uv.xyz / uv.w;
return tex.sample_compare(shadow_sampler, uvp.xy, uvp.z);
}
inline float shadow2DArray(sampler shadow_sampler, depth2d_array<float> tex, float3 uv, uint slice)
{
return tex.sample_compare(shadow_sampler, uv.xy, slice, uv.z);
}
inline float shadow2DArrayProj(sampler shadow_sampler, depth2d_array<float> tex, float4 uv, uint slice)
{
float3 uvp = uv.xyz / uv.w;
return tex.sample_compare(shadow_sampler, uvp.xy, slice, uvp.z);
}
// MARK Shadow
inline float4 transformViewPosInShadowSpace(float3 pos, float4x4 shadowMatrix, bool reverseZ)
{
//project into light space
float4 lightScreen = shadowMatrix * float4(pos, 1.f);
// ensure receiver after the shadow projection box are not in shadow (when no caster == 1. instead of infinite)
// TODO : this is awkward : we maybe should rework the comparison order to have something more natural
if (!reverseZ) {
lightScreen.z = min(lightScreen.z, 0.9999f * lightScreen.w);
} else {
if (lightScreen.z <= 0.0) { // out of clip space will always be < of min shadowmap value (0), so considered in shadow. Artificially setting it to larger value than 1 will make the test fail = no shadow.
lightScreen.z = 2.0;
}
}
return lightScreen;
}
inline float ComputeShadow(sampler shadow_sampler, float3 worldPos, float4x4 shadowMatrix, depth2d<float> shadowMap, bool reverseZ)
{
float4 lightScreen = transformViewPosInShadowSpace(worldPos, shadowMatrix, reverseZ);
float shadow = shadow2DProj(shadow_sampler, shadowMap, lightScreen);
// Is this useful ?
shadow *= step(0., lightScreen.w);
return shadow;
}
inline float ComputeSoftShadowGrid(sampler shadow_sampler, float3 worldPos, float4x4 shadowMatrix, depth2d<float> shadowMap, int sampleCount, bool reverseZ)
{
float4 lightScreen = transformViewPosInShadowSpace(worldPos, shadowMatrix, reverseZ);
// if sampleCount is known compileTime, this get rid of the shadowKernel binding
float shadow;
if (sampleCount <= 1) {
shadow = shadow2DProj(shadow_sampler, shadowMap, lightScreen);
} else {
float3 uvp = lightScreen.xyz / lightScreen.w;
uvp.z += reverseZ ? 0.005f : -0.005f; // TODO: get rid of hardcoded bias...
float2 texelSize = 2.f / float2(shadowMap.get_width(), shadowMap.get_height());
float2 origin = uvp.xy - (sampleCount * 0.5f) * texelSize;
// penumbra
if (sampleCount <= 4) { // offset are limited to [-7..8]
half totalAccum = 0.h;
for (int y = 0; y < sampleCount; ++y) {
for (int x = 0; x < sampleCount; ++x) {
totalAccum += half(shadowMap.sample_compare(shadow_sampler, origin, uvp.z, 2 * int2(x,y)));
}
}
shadow = totalAccum / half(sampleCount * sampleCount);
} else {
float totalAccum = 0.f;
for (int y = 0; y < sampleCount; ++y) {
for (int x = 0; x < sampleCount; ++x) {
float2 samplePos = origin + texelSize * float2(x, y);
totalAccum += shadowMap.sample_compare(shadow_sampler, samplePos, uvp.z);
}
}
shadow = totalAccum / float(sampleCount * sampleCount);
}
}
// Is this useful ?
shadow *= step(0., lightScreen.w);
return shadow;
}
inline float ComputeSoftShadow(sampler shadow_sampler, float3 worldPos, float4x4 shadowMatrix, depth2d<float> shadowMap, constant float4* shadowKernel, int sampleCount, float shadowRadius, bool reverseZ)
{
float4 lightScreen = transformViewPosInShadowSpace(worldPos, shadowMatrix, reverseZ);
// if sampleCount is known compileTime, this get rid of the shadowKernel binding
float shadow;
if (sampleCount <= 1) {
shadow = shadow2DProj(shadow_sampler, shadowMap, lightScreen);
} else {
//*
// penumbra
float3 center_uv = lightScreen.xyz / lightScreen.w;
float3 scale_uv = float3(shadowRadius, shadowRadius, reverseZ ? shadowRadius * center_uv.z : shadowRadius / lightScreen.w );
//smooth all samples
float totalAccum = 0.0;
for (int i = 0; i < sampleCount; i++) {
totalAccum += shadow2D(shadow_sampler, shadowMap, center_uv + shadowKernel[i].xyz * scale_uv);
}
/*/ This version could introduce more shadow acne
float3 uvp = lightScreen.xyz / lightScreen.w;
float2 texelSize = shadowRadius;
//smooth all samples
float totalAccum = 0.0;
for (int i=0; i < sampleCount; i++){
float2 samplePos = uvp.xy + texelSize * shadowKernel[i].xy;
totalAccum += shadowMap.sample_compare(shadow_sampler, samplePos, uvp.z);
}
//*/
shadow = totalAccum / float(sampleCount);
}
// Is this useful ?
shadow *= step(0., lightScreen.w);
return shadow;
}
inline float ComputeCascadeBlendAmount(float3 shadowPos, bool cascadeBlending)
{
const float cascadeBlendingFactor = 0.1f; // No need to configure that
float3 cascadePos = abs(shadowPos.xyz * 2.f - 1.f);
if (cascadeBlending) {
#if 0
const float edge = 1.f - cascadeBlendingFactor;
// could also do a smoothstep
cascadePos = 1.f - saturate((cascadePos - edge) / cascadeBlendingFactor);
return cascadePos.x * cascadePos.y * cascadePos.z; //min(o.x, o.y);
#else
// OPTIM use reduce_max
float distToEdge = 1.0f - max(max(cascadePos.x, cascadePos.y), cascadePos.z);
return smoothstep(0.0f, cascadeBlendingFactor, distToEdge);
#endif
} else {
return step(cascadePos.x, 1.f) * step(cascadePos.y, 1.f) * step(cascadePos.z, 1.f);
}
}
inline float4 SampleShadowCascade(sampler shadow_sampler, depth2d_array<float> shadowMaps, float3 shadowPosition, uint cascadeIndex, constant float4* shadowKernel, int sampleCount, float shadowRadius)
{
// cascade debug + grid
float2 gridSize = float2(shadowMaps.get_width(), shadowMaps.get_height()) / 32;
float gd = scn::checkerboard(shadowPosition.xy, gridSize);
float3 gridCol = mix(float3(scn::debugColorForCascade(cascadeIndex).rgb), float3(0.f), float3(gd > 0.f));
float shadow = 0.f;
if (sampleCount > 1) {
// penumbra : sum all samples
for (int i = 0; i < sampleCount; ++i) {
shadow += shadow2DArray(shadow_sampler, shadowMaps, shadowKernel[i].xyz * shadowRadius + shadowPosition, cascadeIndex);
}
shadow /= float(sampleCount);
} else {
// OPTIM : do not use proj version since cascade are never projective
shadow = shadow2DArray(shadow_sampler, shadowMaps, shadowPosition, cascadeIndex);
}
return float4(gridCol, shadow);
}
inline float4 ComputeCascadedShadow(sampler shadow_sampler, float3 viewPos, float4x4 shadowMatrix, constant float4 *cascadeScale, constant float4 *cascadeBias, int cascadeCount, depth2d_array<float> shadowMaps, bool enableCascadeBlending, constant float4* shadowKernel, int sampleCount, float shadowRadius)
{
float4 shadow = 0.f;
float opacitySum = 1.f;
// get the position in light space
float3 pos_ls = (shadowMatrix * float4(viewPos, 1.f)).xyz;
for (int c = 0; c < cascadeCount; ++c) {
float3 pos_cs = pos_ls * cascadeScale[c].xyz + cascadeBias[c].xyz;
// we multiply the radius by the scale factor of the cascade
float cascadeRadius = shadowRadius * cascadeScale[c].x;
float opacity = ComputeCascadeBlendAmount(pos_cs, enableCascadeBlending);
if (opacity > 0.f) { // this cascade should be considered
float alpha = opacity * opacitySum;
shadow += SampleShadowCascade(shadow_sampler, shadowMaps, pos_cs, c, shadowKernel, sampleCount, cascadeRadius) * alpha;
opacitySum -= alpha;
}
if (opacitySum <= 0.f) // fully opaque shadow (no more blending needed) -> bail out
break;
}
return shadow;
}
namespace NAMESPACE_HASH {
// Macro for layered rendering & shadermodifier
#ifdef USE_LAYERED_RENDERING
#define texture2d_layer texture2d_array
#define sampleLayer(a,b) sample(a,b,in.sliceIndex)
#else
#define texture2d_layer texture2d
#define sampleLayer(a,b) sample(a,b)
#endif
#if defined(HAS_NORMAL) || defined(USE_OPENSUBDIV)
#define HAS_OR_GENERATES_NORMAL 1
#endif
#ifdef C3D_USE_TEXTURE_FOR_LIGHT_INDICES
#define LightIndex(lid) u_lightIndicesTexture.read((ushort)lid).x
#else
#define LightIndex(lid) u_lightIndicesBuffer[lid]
#endif
// Inputs
typedef struct {
#ifdef USE_MODELTRANSFORM
float4x4 modelTransform;
#endif
#ifdef USE_INVERSEMODELTRANSFORM
float4x4 inverseModelTransform;
#endif
#ifdef USE_MODELVIEWTRANSFORM
float4x4 modelViewTransform;
#endif
#ifdef USE_INVERSEMODELVIEWTRANSFORM
float4x4 inverseModelViewTransform;
#endif
#ifdef USE_NORMALTRANSFORM
float4x4 normalTransform;
#endif
#ifdef USE_MODELVIEWPROJECTIONTRANSFORM
float4x4 modelViewProjectionTransform;
#endif
#ifdef USE_INVERSEMODELVIEWPROJECTIONTRANSFORM
float4x4 inverseModelViewProjectionTransform;
#endif
#ifdef USE_MOTIONBLUR
float4x4 lastFrameModelTransform;
float motionBlurIntensity;
#endif
#ifdef USE_BOUNDINGBOX
float2x3 boundingBox;
#endif
#ifdef USE_WORLDBOUNDINGBOX
float2x3 worldBoundingBox;
#endif
#ifdef USE_NODE_OPACITY
float nodeOpacity;
#endif
#if defined(USE_PROBES_LIGHTING) && (USE_PROBES_LIGHTING == 2)
sh2_coefficients shCoefficients;
#elif defined(USE_PROBES_LIGHTING) && (USE_PROBES_LIGHTING == 3)
sh3_coefficients shCoefficients;
#endif
#ifdef USE_SKINNING // need to be last since we may cut the buffer size based on the real bone number
float4 skinningJointMatrices[765]; // Consider having a separate buffer ?
#endif
} commonprofile_node;
typedef struct {
float3 position [[attribute(SCNVertexSemanticPosition)]];
#ifdef HAS_NORMAL
float3 normal [[attribute(SCNVertexSemanticNormal)]];
#endif
#ifdef USE_TANGENT
float4 tangent [[attribute(SCNVertexSemanticTangent)]];
#endif
#ifdef USE_VERTEX_COLOR
float4 color [[attribute(SCNVertexSemanticColor)]];
#endif
#ifdef USE_SKINNING
float4 skinningWeights [[attribute(SCNVertexSemanticBoneWeights)]];
uint4 skinningJoints [[attribute(SCNVertexSemanticBoneIndices)]];
#endif
#if defined(NEED_IN_TEXCOORD0) || defined(DEBUG_PIXEL)
float2 texcoord0 [[attribute(SCNVertexSemanticTexcoord0)]];
#endif
#ifdef NEED_IN_TEXCOORD1
float2 texcoord1 [[attribute(SCNVertexSemanticTexcoord1)]];
#endif
#ifdef NEED_IN_TEXCOORD2
float2 texcoord2 [[attribute(SCNVertexSemanticTexcoord2)]];
#endif
#ifdef NEED_IN_TEXCOORD3
float2 texcoord3 [[attribute(SCNVertexSemanticTexcoord3)]];
#endif
#ifdef NEED_IN_TEXCOORD4
float2 texcoord4 [[attribute(SCNVertexSemanticTexcoord4)]];
#endif
#ifdef NEED_IN_TEXCOORD5
float2 texcoord5 [[attribute(SCNVertexSemanticTexcoord5)]];
#endif
#ifdef NEED_IN_TEXCOORD6
float2 texcoord6 [[attribute(SCNVertexSemanticTexcoord6)]];
#endif
#ifdef NEED_IN_TEXCOORD7
float2 texcoord7 [[attribute(SCNVertexSemanticTexcoord7)]];
#endif
} scn_vertex_t; // __attribute__((scn_per_frame));
typedef struct {
float4 fragmentPosition [[position]]; // The window relative coordinate (x, y, z, 1/w) values for the fragment
#ifdef USE_POINT_RENDERING
float fragmentSize [[point_size]];
#endif
#ifdef USE_VERTEX_COLOR
float4 vertexColor;
#endif
#ifdef USE_PER_VERTEX_LIGHTING
float3 diffuse;
#ifdef USE_SPECULAR
float3 specular;
#endif
#ifdef USE_CLEARCOAT
float clearCoat;
#endif
#ifdef USE_CLEARCOATROUGHNESS
float clearCoatRoughness;
#endif
#ifdef USE_CLEARCOATNORMAL
float clearCoatNormal;
#endif
#endif
#if defined(USE_POSITION) && (USE_POSITION == 2)
float3 position;
#endif
#if defined(USE_NORMAL) && (USE_NORMAL == 2) && defined(HAS_OR_GENERATES_NORMAL)
float3 normal;
#endif
#if defined(USE_TANGENT) && (USE_TANGENT == 2)
float3 tangent;
#endif
#if defined(USE_BITANGENT) && (USE_BITANGENT == 2)
float3 bitangent;
#endif
#ifdef USE_DISPLACEMENT_MAP
float2 displacementTexcoord; // Displacement texture coordinates
#endif
#ifdef USE_CLEARCOAT_MAP
float2 clearCoatTexcoord; // ClearCoat texture coordinates
#endif
#ifdef USE_CLEARCOATROUGHNESS_MAP
float2 clearCoatRoughnessTexcoord; // ClearCoatRoughness texture coordinates
#endif
#ifdef USE_CLEARCOATNORMAL_MAP
float2 clearCoatNormalTexcoord; // ClearCoatNormal texture coordinates
#endif
#ifdef USE_NODE_OPACITY
float nodeOpacity;
#endif
#ifdef USE_TEXCOORD
float2 texcoord0;
#endif
#ifdef USE_EXTRA_VARYINGS
#endif
#ifdef USE_MOTIONBLUR
float3 mv_fragment;
float3 mv_lastFragment;
#endif
#ifdef USE_OUTLINE
float outlineHash [[ flat ]];
#endif
#ifdef USE_LAYERED_RENDERING
uint sliceIndex [[render_target_array_index]];
#endif
#ifdef USE_MULTIPLE_VIEWPORTS_RENDERING
uint sliceIndex [[viewport_array_index]];
#endif
#if DEBUG_PIXEL
float2 uv0;
#endif
} commonprofile_io;
// Shader modifiers declaration (only enabled if one modifier is present)
#ifdef USE_SHADER_MODIFIERS
#endif
// This may rely on shader modifiers declaration
#define USE_QUAT_FOR_IES 1
// 256 bytes
struct scn_light
{
float4 color; // color.rgb + shadowColor.a 16
float3 pos; // 16 (12)
float3 dir; // 16 (12)
float shadowRadius; // 4
uint8_t lightType; // 1
uint8_t attenuationType; // 1
uint8_t shadowSampleCount; // 1
// 55 but in reality 64 for alignment reasons
union {
struct {
float4 cascadeScale[4]; // max cascade count
float4 cascadeBias[4];
} directional; // 128
struct {
float4 attenuationFactors; // scale/bias/power/invSquareRadius 16
float3 shadowScaleBias; // xy: scale/bias for z_lin -> z_ndc, z: depth bias
} omni;
struct {
float4 _attenuationFactors; // need to match omni, always use omni.attenuationFactors
float2 scaleBias; // scale/bias to compute spot falloff
} spot;
struct {
float4 _attenuationFactors; // need to match omni, always use omni.attenuationFactors
float2 scaleBias; // scale/bias to compute ies LUT
#if USE_QUAT_FOR_IES
float4 light_from_view_quat; // OPTIM: this could be a simple quaternion
#else
float4x4 light_from_view; // OPTIM: this could be a simple quaternion
#endif
} ies;
union {
struct {
float2 halfExtents;
float doubleSided;
} rectangle;
struct {
uint32_t vertexCount;
float doubleSided;
} polygon;
struct {
float halfLength;
} line;
struct {
float2 halfExtents;
float doubleSided;
} ellipse;
struct {
float3 halfExtents;
} ellipsoid;
} area;
struct {
float3 offset;
float4 halfExtents; // w: contains the blending distance
float3 parallaxCenter;
float3 parallaxExtents;
int32_t index; // index of the probe in the probe array (do not use uint8_t because of compiler crash)
int32_t parallaxCorrection; // do not use bool (compiler crash)
} probe;
} parameters; // 128
float4x4 shadowMatrix; // 64
};
#if defined(__METAL_VERSION__) && __METAL_VERSION__ >= 120
#define ambientOcclusionTexcoord ambientTexcoord
struct SCNShaderSurface {
float3 view; // Direction from the point on the surface toward the camera (V)
float3 position; // Position of the fragment
float3 normal; // Normal of the fragment (N)
float3 geometryNormal; // Normal of the fragment - not taking into account normal map
float2 normalTexcoord; // Normal texture coordinates
float3 tangent; // Tangent of the fragment
float3 bitangent; // Bitangent of the fragment
float4 ambient; // Ambient property of the fragment
float2 ambientTexcoord; // Ambient texture coordinates
float4 diffuse; // Diffuse property of the fragment. Alpha contains the opacity.
float2 diffuseTexcoord; // Diffuse texture coordinates
float4 specular; // Specular property of the fragment
float2 specularTexcoord; // Specular texture coordinates
float4 emission; // Emission property of the fragment
float2 emissionTexcoord; // Emission texture coordinates
float4 selfIllumination; // selfIllumination property of the fragment
float2 selfIlluminationTexcoord; // selfIllumination texture coordinates
float4 multiply; // Multiply property of the fragment
float2 multiplyTexcoord; // Multiply texture coordinates
float4 transparent; // Transparent property of the fragment
float2 transparentTexcoord; // Transparent texture coordinates
float4 reflective; // Reflective property of the fragment
float metalness; // Metalness
float2 metalnessTexcoord; // Metalness texture coordinates
float roughness; // Roughness
float2 roughnessTexcoord; // Roughness texture coordinates
float clearCoat; // ClearCoat property of the fragment
float2 clearCoatTexcoord; // ClearCoat texture coordinates
float clearCoatRoughness; // ClearCoatRoughness property of the fragment
float2 clearCoatRoughnessTexcoord;// ClearCoatRoughness texture coordinates
float3 clearCoatNormal; // ClearCoatNormal property of the fragment
float2 clearCoatNormalTexcoord;// ClearCoatNormal texture coordinates
float shininess; // Shininess property of the fragment.
float fresnel; // Fresnel property of the fragment.
float ambientOcclusion; // Ambient occlusion term of the fragment
float3 _normalTS; // UNDOCUMENTED in tangent space
float3 _clearCoatNormalTS; // UNDOCUMENTED in tangent space
#ifdef USE_SURFACE_EXTRA_DECL
#endif
};
// Structure to gather property of a light, packed to give access in a light shader modifier
// This must be kept intact for back compatibility in lighting modifiers
struct SCNShaderLight {
float4 intensity;
float3 direction;
float _att;
float3 _spotDirection;
float _distance;
};
enum SCNLightingModel
{
SCNLightingModelConstant,
SCNLightingModelLambert,
SCNLightingModelPhong,
SCNLightingModelBlinn,
SCNLightingModelNone,
SCNLightingModelPhysicallyBased,
SCNLightingModelShadowOnly,
SCNLightingModelCustom // 6 implicit when using a lighting shader modifier
};
enum C3DLightAttenuationType
{
kC3DLightAttenuationTypeNone,
kC3DLightAttenuationTypeConstant,
kC3DLightAttenuationTypeLinear,
kC3DLightAttenuationTypeQuadratic,
kC3DLightAttenuationTypeExponent,
kC3DLightAttenuationTypePhysicallyBased,
};
#define PROBES_NORMALIZATION 0
#define PROBES_OUTER_BLENDING 1
struct SCNShaderLightingContribution
{
float3 ambient;
float3 diffuse;
float3 specular;
float3 modulate;
#ifdef USE_SHADOWONLY
float shadowFactor;
#endif
#if PROBES_NORMALIZATION
float4 probesWeightedSum; // rgb: sum a:normalization factor
#else
float probeRadianceRemainingFactor;
#endif
thread SCNShaderSurface& surface;
#ifdef USE_PER_VERTEX_LIGHTING
commonprofile_io out;
#else
commonprofile_io in;
#endif
#if USE_REVERSE_Z
constant static constexpr bool reverseZ = true;
#else
constant static constexpr bool reverseZ = false;
#endif
#ifdef USE_PBR
static constexpr sampler linearSampler = sampler(filter::linear, mip_filter::linear);
float selfIlluminationOcclusion;
float3 reflectance;
float3 probeReflectance;
float NoV;
float NoVClearCoat;
float3 probeReflectanceClearCoat;
#endif
SCNShaderLightingContribution(thread SCNShaderSurface& iSurface, commonprofile_io io):surface(iSurface)
#ifdef USE_PER_VERTEX_LIGHTING
,out(io)
#else
,in(io)
#endif
{
ambient = 0.f;
diffuse = 0.f;
specular = 0.f;
#ifdef USE_SHADOWONLY
shadowFactor = 1.f;
#endif
#if PROBES_NORMALIZATION
#if PROBES_OUTER_BLENDING
probesWeightedSum = float4(0.f);
#else
probesWeightedSum = float4(0.f, 0.f, 0.f, 0.000001f); // avoid divide by 0 with an epsilon
#endif
#else
probeRadianceRemainingFactor = 1.f;
#endif
#ifdef USE_MODULATE
modulate = 1.f;
#else
modulate = 0.f;
#endif
}
#ifdef USE_PBR
void prepareForPBR(texture2d<float, access::sample> specularDFG, float occ)
{
selfIlluminationOcclusion = occ;
float3 n = surface.normal;
float3 v = surface.view;
reflectance = mix(PBR_F0_NON_METALLIC, surface.diffuse.rgb, surface.metalness);
NoV = saturate(dot(n, v));
float2 DFG = specularDFG.sample(linearSampler, float2(NoV, surface.roughness)).rg;
probeReflectance = reflectance * DFG.r + DFG.g;
}
void prepareForPBRClearCoat(texture2d<float, access::sample> specularDFG)
{
float3 n = surface.clearCoatNormal;
float3 v = surface.view;
NoVClearCoat = saturate(dot(n, v));
float2 DFG = specularDFG.sample(linearSampler, float2(NoVClearCoat, surface.clearCoatRoughness)).rg;
probeReflectanceClearCoat = 0.04 * DFG.r + DFG.g;
}
#endif
#ifdef USE_LIGHT_MODIFIER
#endif
float4 debug_pixel(float2 fragmentPosition)
{
const int width = 64;
switch (int(fragmentPosition.x + fragmentPosition.y ) / width) {
case 0: return float4(surface.view, 1.f);
case 1: return float4(surface.position, 1.f);
case 2: return float4(surface.normal, 1.f);
case 3: return float4(surface.geometryNormal, 1.f);
case 4: return float4(float3(surface.ambientOcclusion), 1.f);
case 5: return surface.diffuse;
case 6: return float4(float3(surface.metalness), 1.f);
case 7: return float4(float3(surface.roughness), 1.f);
case 8: return float4(ambient, 1.f);
case 9: return float4(diffuse, 1.f);
default: return float4(specular, 1.f);
}
}
// tool functions, could be external
static inline float3 lambert_diffuse(float3 l, float3 n, float3 color, float intensity) {
return color * (intensity * saturate(dot(n, l)));
}
void lambert(float3 l, float3 color, float intensity)
{
diffuse += lambert_diffuse(l, surface.normal, color, intensity);
}
void blinn(float3 l, float3 color, float intensity)
{
float3 D = lambert_diffuse(l, surface.normal, color, intensity);
diffuse += D;
float3 h = normalize(l + surface.view);
specular += powr(saturate(dot(surface.normal, h)), surface.shininess) * D;
}
void phong(float3 l, float3 color, float intensity)
{
float3 D = lambert_diffuse(l, surface.normal, color, intensity);
diffuse += D;
float3 r = reflect(-l, surface.normal);
specular += powr(saturate(dot(r, surface.view)), surface.shininess) * D;
}
#ifdef USE_PBR
void pbr(float3 l, float3 color, float intensity)
{
float3 n = surface.normal;
float3 v = surface.view;
float3 h = normalize(l + v);
float NoL = saturate(dot(n, l));
float NoH = saturate(dot(n, h));
float LoH = saturate(dot(l, h));
// for analytical lights, perfect mirror will not exhibit any specular
// so clamp the value to an arbitrary low values
// https://google.github.io/filament/Filament.md.html
// value chosen such that (MIN_ROUGHNESS^4) > 0 in fp16 (i.e. 2^(-14/4), slightly rounded up)
float roughness = max(surface.roughness, 0.089f);
float alpha = roughness * roughness; // perceptually-linear roughness
float D = scn_brdf_D(alpha, NoH);
float3 F = scn_brdf_F_opt(reflectance, LoH);
float Vis = scn_brdf_V(alpha, NoL, NoV);
// keep the scalar separated
diffuse += color * (NoL * M_1_PI_F * intensity);
specular += color * F * ( NoL * D * Vis * intensity);
#ifdef USE_CLEARCOAT
n = surface.clearCoatNormal;
roughness = max(surface.clearCoatRoughness, 0.089f);
alpha = roughness * roughness; // perceptually-linear roughness
//we should recompute NoH, because the coat normal is not necesseraly the base normal
//-≥ either the coatNormal, or the geometry normal
float NoH_coat = saturate(dot(n, h));
float NoL_coat = saturate(dot(n, l));
D = scn_brdf_D(alpha, NoH_coat);
F = scn_brdf_F_opt(0.04, LoH) * surface.clearCoat;
Vis = scn_brdf_V(alpha, NoL_coat, saturate(dot(n,v)));
float attenuation = 1.0 - F.r;
specular *= (attenuation * attenuation);
specular += color * F * ( NoL_coat * D * Vis * intensity);
#endif
}
#endif
void custom(float3 _l, float3 _color, float _intensity)
{
#ifdef USE_LIGHT_MODIFIER
thread SCNShaderLightingContribution &_lightingContribution = *this;
thread SCNShaderSurface& _surface = surface;
SCNShaderLight _light = {.direction = _l, .intensity = float4(_color, 1.f), ._att = _intensity };
// DoLightModifier START
// DoLightModifier END
#endif
}
void shade(float3 l, float3 color, float intensity)
{
#ifdef LIGHTING_MODEL
switch (LIGHTING_MODEL) {
#ifdef USE_SHADOWONLY
case SCNLightingModelShadowOnly: shadowFactor *= intensity; break;
#endif
case SCNLightingModelLambert: lambert(l, color, intensity); break;
case SCNLightingModelBlinn: blinn(l, color, intensity); break;
case SCNLightingModelPhong: phong(l, color, intensity); break;
#ifdef USE_PBR
case SCNLightingModelPhysicallyBased: pbr(l, color, intensity); break;
#endif
case SCNLightingModelCustom: custom(l, color, intensity); break;
default: break; // static_assert(0, "should not go there");
}
#endif
}
// this implementation seems more correct as it never goes larger than when near (dist<1)
// https://imdoingitwrong.wordpress.com/2011/01/31/light-attenuation/
// cutoff must be computed with Eq(1) with lightAttenuationEnd and stored in the light struct
float pbr_dist_attenuation_alternate(float3 l, float cutoff) {
// float radius = 0.01f; // consider point lights as 1cm
float radius = 0.1f; // consider point lights as 10cm
float factor = 1.f / (1.f + length(l)/radius);
float attenuation = saturate(factor * factor); // Eq(1)
return saturate((attenuation - cutoff) / (1.f - cutoff));
}
float pbr_dist_attenuation(float3 l, float inv_square_radius) {
float sqr_dist = length_squared(l);
float atten = 1.f / max(sqr_dist, 0.0001f);
// smoothing factor to avoid hard clip of the lighting
float factor = saturate(1.f - scn::sq(sqr_dist * inv_square_radius));
return atten * factor * factor;
}
float non_pbr_dist_attenuation(float3 l, float4 att)
{
return powr(saturate(length(l) * att.x + att.y), att.z);
}
float dist_attenuation(float3 unnormalized_l, scn_light light)
{
#ifdef USE_PBR
return 1000.f * pbr_dist_attenuation(unnormalized_l, light.parameters.omni.attenuationFactors.w);
// This alternate model seems to better fit V-Ray render.... To confirm
// float intensity = 1000.f * pbr_dist_attenuation_alternate(unnormalized_l, 0.f);
#else
return non_pbr_dist_attenuation(unnormalized_l, light.parameters.omni.attenuationFactors);
#endif
}
float spot_attenuation(float3 l, scn_light light)
{
// only support linear attenuation (spotExponent is SPI)
return saturate(dot(l, light.dir) * light.parameters.spot.scaleBias.x + light.parameters.spot.scaleBias.y);
}
void shade_modulate(float3 l, float4 color, float intensity)
{
constexpr half3 white = half3(1.h);
// color.a contains the gobo slot intensity -> used to fade it
modulate *= float3(mix(white, half3(color.rgb), half(color.a * intensity)));
}
float3 gobo(float3 pos, scn_light light, texture2d<half> goboTexture, sampler goboSampler)
{
half3 g = texture2DProj(goboTexture, goboSampler, (light.shadowMatrix * float4(pos, 1.f))).rgb;
return light.color.rgb * float3(mix(1.h, g, half(light.color.a)));
}
float shadow(float3 pos, scn_light light, depth2d<float> shadowMap)
{
float shadow = ComputeShadow(scn_shadow_sampler, pos, light.shadowMatrix, shadowMap, reverseZ);
return 1.f - shadow * light.color.a; // shadow color
}
// this versions takes the sample count from the light. This forces dynamic loops, not a good idea on iOS
float shadow(float3 pos, scn_light light, depth2d<float> shadowMap, constant float4* shadowKernel)
{
float shadow = ComputeSoftShadow(scn_shadow_sampler, pos, light.shadowMatrix, shadowMap, shadowKernel, light.shadowSampleCount, light.shadowRadius, reverseZ);
return 1.f - shadow * light.color.a; // shadow color
}
float shadow(float3 pos, scn_light light, depth2d<float> shadowMap, constant float4* shadowKernel, int shadowSampleCount)
{
float shadow = ComputeSoftShadow(scn_shadow_sampler, pos, light.shadowMatrix, shadowMap, shadowKernel, shadowSampleCount, light.shadowRadius, reverseZ);
return 1.f - shadow * light.color.a; // shadow color
}
float shadow(float3 pos, scn_light light, depth2d<float> shadowMap, int shadowSampleCount)
{
float shadow = ComputeSoftShadowGrid(scn_shadow_sampler, pos, light.shadowMatrix, shadowMap, shadowSampleCount, reverseZ);
return 1.f - shadow * light.color.a; // shadow color
}
float shadow_omni(float3 pos_vs, float3 nrm_vs, scn_light light, depthcube<float> shadowMap, constant float4* shadowKernel, int sampleCount)
{
// else use hemispheric sampling
#define USE_TANGENT_SAMPLING 0
float2 scaleBias = light.parameters.omni.shadowScaleBias.xy;
float depthBias = light.parameters.omni.shadowScaleBias.z;
// offset/bias for shadow acne
pos_vs += nrm_vs * depthBias;
// transform pos from view space to light space
float3 pos_ls = (light.shadowMatrix * float4(pos_vs, 1.f)).xyz;
// compute z_lin for sample cube face (symetric so +x == -x, etc)
float z_lin = scn::reduce_max(abs(pos_ls));
// if we want to clip the shadows to the far planes of the cube...
// if (z_lin > zFar)
// return 1.f;
// transform linear_z to depthbuffer_z
float z_ndc = (z_lin * scaleBias.x + scaleBias.y) / z_lin - depthBias;
// if sampleCount is known compileTime, this get rid of the shadowKernel binding
float shadow;
if (sampleCount <= 1) {
shadow = shadowMap.sample_compare(scn_shadow_sampler, pos_ls.xyz, z_ndc);
} else {
// penumbra
float filteringSizeFactor = light.shadowRadius;
#if USE_TANGENT_SAMPLING
float3 tgt_x, tgt_y;
scn::orthogonal_basis(pos_ls, tgt_x, tgt_y);
#else
float3 nrm_ls = (light.shadowMatrix * float4(nrm_vs, 0.f)).xyz;
#endif
//smooth all samples
float totalAccum = 0.0;
for(int i=0; i < sampleCount; i++){
#if USE_TANGENT_SAMPLING
float2 scale = shadowKernel[i].xy * filteringSizeFactor * 2.f;
float3 smp_ls = pos_ls.xyz + tgt_x * scale.x + tgt_y * scale.y;
#else
float3 smp_ls = pos_ls.xyz + scn::randomHemisphereDir(nrm_ls, shadowKernel[i].xy) * filteringSizeFactor;
#endif
// Do we want to compare with reference depth or smp depth?
// z_lin = scn::reduce_max(abs(smp_ls));
// z_ndc = (z_lin * scaleBias.x + scaleBias.y) / z_lin;
totalAccum += shadowMap.sample_compare(scn_shadow_sampler, smp_ls, z_ndc);
}
shadow = totalAccum / float(sampleCount);
}
return 1.f - shadow * light.color.a; // shadow color
}
float shadow(float3 pos, constant scn_light& light, depth2d_array<float> shadowMaps, int cascadeCount, bool blendCascade, constant float4* shadowKernel, int sampleCount)
{
float shadow = ComputeCascadedShadow(scn_shadow_sampler, pos, light.shadowMatrix, light.parameters.directional.cascadeScale, light.parameters.directional.cascadeBias, cascadeCount, shadowMaps, blendCascade, shadowKernel, sampleCount, light.shadowRadius).a;
return 1.f - shadow * light.color.a; // shadow color
}
// MARK: Directional
void add_directional(scn_light light)
{
#ifdef USE_PBR
float intensity = M_PI_F;
#else
float intensity = 1.f;
#endif
shade(light.dir, light.color.rgb, intensity);
}
// gobo
void add_directional(scn_light light, texture2d<half> goboTexture, sampler goboSampler, bool modulated)
{
#ifdef USE_PBR
float intensity = M_PI_F;
#else
float intensity = 1.f;
#endif
light.color.rgb = gobo(surface.position, light, goboTexture, goboSampler);
if (modulated) {
shade_modulate(light.dir, light.color, 1.f);
} else {
shade(light.dir, light.color.rgb, intensity);
}
}
// support simple shadows (no soft, no cascade)
void add_directional(scn_light light, depth2d<float> shadowMap)
{
#ifdef USE_PBR
float intensity = M_PI_F;
#else
float intensity = 1.f;
#endif
intensity *= shadow(surface.position, light, shadowMap);
shade(light.dir, light.color.rgb, intensity);
}
// support soft shadows (non cascaded, dynamic sample count)
void add_directional(scn_light light, depth2d<float> shadowMap, constant float4* shadowKernel)
{
#ifdef USE_PBR
float intensity = M_PI_F;
#else
float intensity = 1.f;
#endif
intensity *= shadow(surface.position, light, shadowMap, shadowKernel);
shade(light.dir, light.color.rgb, intensity);
}
void add_directional(scn_light light, depth2d<float> shadowMap, constant float4* shadowKernel, int sampleCount)
{
#ifdef USE_PBR
float intensity = M_PI_F;
#else
float intensity = 1.f;
#endif
intensity *= shadow(surface.position, light, shadowMap, shadowKernel, sampleCount);
shade(light.dir, light.color.rgb, intensity);
}
// regular grid PCF
void add_directional(scn_light light, depth2d<float> shadowMap, int sampleCount)
{
#ifdef USE_PBR
float intensity = M_PI_F;
#else
float intensity = 1.f;
#endif
intensity *= shadow(surface.position, light, shadowMap, sampleCount);
shade(light.dir, light.color.rgb, intensity);
}
// version supporting cascade shadows
void add_directional(constant scn_light& light, depth2d_array<float> shadowMaps, int cascadeCount, bool blendCascade, constant float4* shadowKernel, int sampleCount, bool debugCascades)
{
#ifdef USE_PBR
float intensity = M_PI_F;
#else
float intensity = 1.f;
#endif
if (debugCascades) {
float4 shadowDebug = ComputeCascadedShadow(scn_shadow_sampler, surface.position, light.shadowMatrix, light.parameters.directional.cascadeScale, light.parameters.directional.cascadeBias, cascadeCount, shadowMaps, blendCascade, shadowKernel, sampleCount, light.shadowRadius);
intensity *= (1.f - shadowDebug.a);
shade(light.dir, light.color.rgb, intensity);
diffuse.rgb = mix(diffuse.rgb, shadowDebug.rgb, light.color.a);
} else {
intensity *= shadow(surface.position, light, shadowMaps, cascadeCount, blendCascade, shadowKernel, sampleCount);
shade(light.dir, light.color.rgb, intensity);
}
}
// MARK: Omni
void add_omni(scn_light light)
{
float3 unnormalized_l = light.pos - surface.position;
float3 l = normalize(unnormalized_l);
shade(l, light.color.rgb, dist_attenuation(unnormalized_l, light));
}
void add_omni(scn_light light, depthcube<float> shadowMap, constant float4* shadowKernel, int sampleCount)
{
float3 unnormalized_l = light.pos - surface.position;
float3 l = normalize(unnormalized_l);
float intensity = dist_attenuation(unnormalized_l, light);
intensity *= shadow_omni(surface.position, surface.normal, light, shadowMap, shadowKernel, sampleCount);
shade(l, light.color.rgb, intensity);
}
void add_local_omni(scn_light light)
{
float3 unnormalized_l = light.pos - surface.position;
float3 l = normalize(unnormalized_l);
shade(l, light.color.rgb, dist_attenuation(unnormalized_l, light));
}
// MARK: Spot
void add_spot(scn_light light)
{
float3 unnormalized_l = light.pos - surface.position;
float3 l = normalize(unnormalized_l);
float intensity = dist_attenuation(unnormalized_l, light);
intensity *= spot_attenuation(l, light);
shade(l, light.color.rgb, intensity);
}
void add_spot(scn_light light, texture2d<half> goboTexture, sampler goboSampler, bool modulated)
{
float3 unnormalized_l = light.pos - surface.position;
float3 l = normalize(unnormalized_l);
float intensity = dist_attenuation(unnormalized_l, light);
intensity *= spot_attenuation(l, light);
light.color.rgb = gobo(surface.position, light, goboTexture, goboSampler);
if (modulated) {
shade_modulate(l, light.color, intensity);
} else {
shade(l, light.color.rgb, intensity);
}
}
void add_local_spot(scn_light light)
{
float3 unnormalized_l = light.pos - surface.position;
float3 l = normalize(unnormalized_l);
float intensity = dist_attenuation(unnormalized_l, light);
intensity *= spot_attenuation(l, light);
shade(l, light.color.rgb, intensity);
}
// support simple shadows (non cascaded)
void add_spot(scn_light light, depth2d<float> shadowMap, constant float4* shadowKernel, int sampleCount)
{
float3 unnormalized_l = light.pos - surface.position;
float3 l = normalize(unnormalized_l);
float intensity = dist_attenuation(unnormalized_l, light);
intensity *= spot_attenuation(l, light);
intensity *= shadow(surface.position, light, shadowMap, shadowKernel, sampleCount);
shade(l, light.color.rgb, intensity);
}
// MARK: Probe
#ifdef USE_PBR
// MARK: Radiance
#ifdef C3D_SUPPORT_CUBE_ARRAY
void add_local_probe(scn_light light, texturecube_array<half> probeTextureArray)
#else
void add_local_probe(scn_light light, texture2d_array<half> probeTextureArray)
#endif
{
#if !PROBES_NORMALIZATION
if (probeRadianceRemainingFactor <= 0.f)
return;
#endif
bool parallaxCorrection = light.parameters.probe.parallaxCorrection;
int probeIndex = light.parameters.probe.index;
float3 probeExtents = light.parameters.probe.halfExtents.xyz;
float blendDist = light.parameters.probe.halfExtents.w;
float3 probeOffset = light.parameters.probe.offset;
float3 parallaxExtents = light.parameters.probe.parallaxExtents;
float3 parallaxCenter = light.parameters.probe.parallaxCenter;
float3 n = surface.normal;
float3 v = surface.view;
float3 r = reflect(-v, n); // mirror vector (view vector around normal)
float3 specDir = scn::mat4_mult_float3(light.shadowMatrix, r);
// TODO blend weight ? accumulate in alpha and normalize ?
float3 pos_ls = (light.shadowMatrix * float4(surface.position, 1.f)).xyz;
// OPTIM: we should be able to multiply by the extents in CPU in matrix and use 1 here...
float3 d = abs(pos_ls) - probeExtents;
#if PROBES_OUTER_BLENDING
if (any(d > blendDist))
#else
if (any(d > 0.f))
#endif
{
return;
}
#if PROBES_NORMALIZATION
// inside ' | ' outside
// nd 1 1 0.5 0 0 (per component)
#if PROBES_OUTER_BLENDING
float3 nd = saturate(-(d / blendDist) * 0.5f + 0.5f);
#else
float3 nd = saturate(-(d / blendDist));
#endif
float probeFactor = (nd.x * nd.y * nd.z) * light.color.r;
#else
// signed distance in the probe box
float sd = min(max(d.x,max(d.y,d.z)),0.0) + length(max(d,0.0));
#if PROBES_OUTER_BLENDING
float probeFactor = saturate(1.f - sd / blendDist);
#else
float probeFactor = saturate(-sd / blendDist);
#endif
// inside | ' outside
// sd -x 0 b +x
// fc 1 1 0 0
probeFactor *= probeRadianceRemainingFactor * light.color.r; // Do we really need this or 1.f is enough (we need this for global probe anyway...)
#endif
if (parallaxCorrection /* && all(d < 0.f) */) {
// OPTIM: we should be able to multiply by the extents in CPU and use 1 here...
float3 pos_off = pos_ls + parallaxCenter;
float3 t1 = ( parallaxExtents - pos_off) / specDir;
float3 t2 = (-parallaxExtents - pos_off) / specDir;
float3 tmax = max(max(0, t1), t2); // max(0, ..) to avoid correction when outside the box (in the blending zone)
float t = min(tmax.x, min(tmax.y, tmax.z));
// Use Distance in WS directly to recover intersection
float3 hit_ls = pos_ls + specDir * t;
specDir = hit_ls - probeOffset;
}
float mipd = float(probeTextureArray.get_num_mip_levels()) - 1.f;
const float intensity = surface.ambientOcclusion * probeFactor;
float mips = surface.roughness * mipd;
#ifdef C3D_SUPPORT_CUBE_ARRAY
float3 LD = float3(probeTextureArray.sample(linearSampler, specDir, probeIndex, level(mips)).rgb);
#else
float2 specUV = scn::dual_paraboloid_from_cartesian(normalize(specDir));
float3 LD = float3(probeTextureArray.sample(linearSampler, specUV, probeIndex, level(mips)).rgb);
#endif
/* Debug blending with primary colors
switch (probeIndex) {
case 1: LD = float3(1.f, 0.f, 0.f); break;
case 2: LD = float3(0.f, 1.f, 0.f); break;
case 3: LD = float3(0.f, 0.f, 1.f); break;
default: LD = float3(1.f, 1.f, 1.f); break;
}*/
// radiance
#if PROBES_NORMALIZATION
probesWeightedSum += float4(LD * intensity * probeReflectance, probeFactor);
#else
probeRadianceRemainingFactor = saturate(probeRadianceRemainingFactor - probeFactor);
specular += LD * intensity * probeReflectance;
#endif
#ifdef USE_CLEARCOAT
n = surface.clearCoatNormal;
r = reflect(-v, n);
specDir = scn::mat4_mult_float3(light.shadowMatrix, r);
if (parallaxCorrection /* && all(d < 0.f) */) {
float3 pos_off = pos_ls + parallaxCenter;
// OPTIM: we should be able to multiply by the extents in CPU and use 1 here...
float3 t1 = ( parallaxExtents - pos_off) / specDir;
float3 t2 = (-parallaxExtents - pos_off) / specDir;
float3 tmax = max(max(0, t1), t2); // max(0, ..) to avoid correction when outside the box (in the blending zone)
float t = min(tmax.x, min(tmax.y, tmax.z));
// Use Distance in WS directly to recover intersection
float3 hit_ls = pos_ls + specDir * t;
specDir = hit_ls - probeOffset;
}
mips = surface.clearCoatRoughness * mipd;
#ifdef C3D_SUPPORT_CUBE_ARRAY
LD = float3(probeTextureArray.sample(linearSampler, specDir, probeIndex, level(mips)).rgb);
#else
specUV = scn::dual_paraboloid_from_cartesian(normalize(specDir));
LD = float3(probeTextureArray.sample(linearSampler, specUV, probeIndex, level(mips)).rgb);
#endif
#if PROBES_NORMALIZATION
probesWeightedSum += float4(LD * intensity * probeReflectance, probeFactor) * surface.clearCoat;
#else
specular += LD * intensity * probeReflectance * surface.clearCoat;
#endif
#endif
}
void add_global_probe(float4x4 localDirToWorldCubemapDir, float environmentIntensity,
#ifdef C3D_SUPPORT_CUBE_ARRAY
texturecube_array<half> probeTextureArray
#else
texture2d_array<half> probeTextureArray
#endif
)
{
float3 n = surface.normal;
float3 v = surface.view;
float3 r = reflect(-v, n); // mirror vector (view vector around normal)
float3 specDir = scn::mat4_mult_float3(localDirToWorldCubemapDir, r);
float mipd = float(probeTextureArray.get_num_mip_levels()) - 1.f;
const float intensity = surface.ambientOcclusion * environmentIntensity;
float mips = surface.roughness * mipd;
#ifdef C3D_SUPPORT_CUBE_ARRAY
float3 LD = float3(probeTextureArray.sample(linearSampler, specDir, 0, level(mips)).rgb);
#else
float2 specUV = scn::dual_paraboloid_from_cartesian(normalize(specDir));
float3 LD = float3(probeTextureArray.sample(linearSampler, specUV, 0, level(mips)).rgb);
#endif
// radiance
specular += LD * intensity * probeReflectance;
}
void add_global_probe(texturecube<float, access::sample> specularLD,
float4x4 localDirToWorldCubemapDir,
float environmentIntensity)
{
float3 n = surface.normal;
float3 v = surface.view;
float3 r = reflect(-v, n); // mirror vector (view vector around normal)
float roughness = surface.roughness;
float roughness2= roughness * roughness;
#if 1
float smoothness = 1.0f - roughness2;
float specularLerpFactor = (1. - smoothness * (sqrt(smoothness) + roughness2));
// This does have an effect on smooth object : seems buggy (plus costly)
//float NoV = 1.f - saturate(dot(n, v));
//specularLerpFactor = saturate(specularLerpFactor + 2.f*NoV*NoV*NoV);
float3 specularDominantNDirection = mix(r, n, specularLerpFactor); // no need to normalize as we fetch in a cubemap
#else
float3 specularDominantNDirection = r;
#endif
// Specular
float mipLevel = roughness * float(specularLD.get_num_mip_levels() - 1);
#if 0 // Seamless cubemap filtering
float3 dirAbs = abs(specularDominantNDirection);
float dirNormInf = max(dirAbs.x, max(dirAbs.y, dirAbs.z));
float scale = 1.0f - exp2(mipLevel) / float(specularLD.get_width());
if (dirAbs.x != dirNormInf) specularDominantNDirection.x *= scale;
if (dirAbs.y != dirNormInf) specularDominantNDirection.y *= scale;
if (dirAbs.z != dirNormInf) specularDominantNDirection.z *= scale;
#endif
float3 LD = specularLD.sample(linearSampler, scn::mat4_mult_float3(localDirToWorldCubemapDir, specularDominantNDirection), level(mipLevel)).rgb;
#if 1 // Specular occlusion - not physically correct
float specularOcclusion = saturate(pow(NoV + surface.ambientOcclusion, exp2(-16.0f * roughness - 1.0f)) - 1.0f + surface.ambientOcclusion);
LD *= specularOcclusion;
#endif
// effectiveAlbedo is multiplied in combine
specular += LD * (surface.ambientOcclusion * environmentIntensity) * probeReflectance;
}
void add_global_probeClearCoat(texturecube<float, access::sample> specularLD,
float4x4 localDirToWorldCubemapDir,
float environmentIntensity)
{
float3 n = surface.clearCoatNormal;
float3 v = surface.view;
float3 r = reflect(-v, n); // mirror vector (view vector around normal)
float roughness = surface.clearCoatRoughness;
// Specular
float mipLevel = roughness * float(specularLD.get_num_mip_levels() - 1);
float3 LD = specularLD.sample(linearSampler, scn::mat4_mult_float3(localDirToWorldCubemapDir, r), level(mipLevel)).rgb;
LD *= surface.ambientOcclusion;
//energy preservation
float Fc = scn_brdf_F_opt(0.04f, NoVClearCoat).r * surface.clearCoat;
float attenuation = 1.0f - Fc;
specular *= (attenuation * attenuation);
// diffuse *= attenuation; //-> darken diffuse when clearCoatRoughness is high
specular += LD * environmentIntensity * probeReflectanceClearCoat * surface.clearCoat;
}
// MARK: Irradiance
void add_irradiance_from_selfIllum()
{
float selfIlluminationAO = saturate(mix(1.f, surface.ambientOcclusion, selfIlluminationOcclusion));
float3 irradiance = selfIlluminationAO * surface.selfIllumination.rgb;
diffuse += irradiance;
}
void add_global_irradiance_from_sh(float4x4 localDirToWorldCubemapDir,
#if defined(USE_PROBES_LIGHTING) && (USE_PROBES_LIGHTING == 2)
sh2_coefficients shCoefficients)
#else
sh3_coefficients shCoefficients)
#endif
{
float3 n_sh_space = scn::mat4_mult_float3(localDirToWorldCubemapDir, surface.normal);
float3 irradiance = shEvalDirection(float4(n_sh_space, 1.), shCoefficients);
diffuse += surface.ambientOcclusion * irradiance;
}
void add_global_irradiance_probe(texturecube<float, access::sample> irradianceTexture,
float4x4 localDirToWorldCubemapDir,
float environmentIntensity)
{
float3 n_cube_space = scn::mat4_mult_float3(localDirToWorldCubemapDir, surface.normal);
float3 irradiance = irradianceTexture.sample(linearSampler, n_cube_space).rgb;
diffuse += (surface.ambientOcclusion * environmentIntensity) * irradiance;
}
#endif // USE_PBR
// MARK: IES
static constexpr sampler iesSampler = sampler(filter::linear, mip_filter::none, address::clamp_to_edge);
float ies_attenuation(float3 l, scn_light light, texture2d<half> iesTexture)
{
#if USE_QUAT_FOR_IES
float3 v = scn::quaternion_rotate_vector(light.parameters.ies.light_from_view_quat, -l);
#else
float3 v = scn::matrix_rotate(light.parameters.ies.light_from_view, -l);
#endif
float phi = (v.z * light.parameters.ies.scaleBias.x + light.parameters.ies.scaleBias.y);
float theta = atan2(v.y, v.x) * 0.5f * M_1_PI_F;
return iesTexture.sample(iesSampler, float2(phi, abs(theta))).r;
}
void add_ies(scn_light light, texture2d<half> iesTexture)
{
float3 unnormalized_l = light.pos - surface.position;
float3 l = normalize(unnormalized_l);
float intensity = dist_attenuation(unnormalized_l, light);
intensity *= ies_attenuation(l, light, iesTexture);
shade(l, light.color.rgb, intensity);
}
void add_ies(scn_light light, texture2d<half> iesTexture, depth2d<float> shadowMap, constant float4* shadowKernel, int sampleCount)
{
float3 unnormalized_l = light.pos - surface.position;
float3 l = normalize(unnormalized_l);
float intensity = dist_attenuation(unnormalized_l, light);
intensity *= ies_attenuation(l, light, iesTexture);
intensity *= shadow(surface.position, light, shadowMap, shadowKernel, sampleCount);
shade(l, light.color.rgb, intensity);
}
// MARK: Area
void add_area_rectangle(scn_light light, texture2d_array<float> bakedDataTexture)
{
#ifdef USE_PBR
float3 v = surface.view;
float3 n = surface.normal;
float3 p = surface.position;
// construct orthonormal basis around N
float3 tangent = normalize(v - n * dot(v, n));
float3 bitangent = cross(n, tangent);
float3x3 shadingSpaceTransform = transpose(float3x3(tangent, n, bitangent));
float3 lightCenter = light.shadowMatrix[3].xyz;
// check if surface is visible from light
float sidedness = dot(light.dir, lightCenter - p);
if (light.parameters.area.rectangle.doubleSided == false && sidedness <= 0.f)
return;
float3 lightRight = light.shadowMatrix[0].xyz * light.parameters.area.rectangle.halfExtents.x * sign(sidedness);
float3 lightTop = light.shadowMatrix[1].xyz * light.parameters.area.rectangle.halfExtents.y;
float4x3 cornerDirections = float4x3((lightCenter + lightRight + lightTop) - p,
(lightCenter + lightRight - lightTop) - p,
(lightCenter - lightRight - lightTop) - p,
(lightCenter - lightRight + lightTop) - p);
cornerDirections[0] = shadingSpaceTransform * cornerDirections[0];
cornerDirections[1] = shadingSpaceTransform * cornerDirections[1];
cornerDirections[2] = shadingSpaceTransform * cornerDirections[2];
cornerDirections[3] = shadingSpaceTransform * cornerDirections[3];
float diffuseAmount = pbr_area_light_eval_rectangle(cornerDirections);
float brdfNorm = 1.f;
float3x3 inverseLTCMatrix = scn_sample_area_light_precomputed_data(v, n, surface.roughness, &brdfNorm, bakedDataTexture);
cornerDirections[0] = inverseLTCMatrix * cornerDirections[0];
cornerDirections[1] = inverseLTCMatrix * cornerDirections[1];
cornerDirections[2] = inverseLTCMatrix * cornerDirections[2];
cornerDirections[3] = inverseLTCMatrix * cornerDirections[3];
float specularAmount = brdfNorm * pbr_area_light_eval_rectangle(cornerDirections);
float3 lightColor = light.color.rgb;
diffuse += diffuseAmount * lightColor;
specular += specularAmount * lightColor * reflectance;
#endif
}
void add_area_polygon(scn_light light, texture2d_array<float> bakedDataTexture, device packed_float2 *vertexPositions)
{
#ifdef USE_PBR
float3 v = surface.view;
float3 n = surface.normal;
float3 p = surface.position;
// construct orthonormal basis around N
float3 tangent = normalize(v - n * dot(v, n));
float3 bitangent = cross(n, tangent);
float3x3 shadingSpaceTransform = transpose(float3x3(tangent, n, bitangent));
float3 lightCenter = light.shadowMatrix[3].xyz;
// check if surface is visible from light
float sidedness = dot(light.dir, lightCenter - p);
if (light.parameters.area.polygon.doubleSided == false && sidedness <= 0.f)
return;
float3 lightRight = light.shadowMatrix[0].xyz * sign(sidedness);
float3 lightTop = light.shadowMatrix[1].xyz;
p = shadingSpaceTransform * p;
lightCenter = shadingSpaceTransform * lightCenter;
lightRight = shadingSpaceTransform * lightRight;
lightTop = shadingSpaceTransform * lightTop;
float diffuseAmount = pbr_area_light_eval_polygon(p, lightCenter, lightRight, lightTop, light.parameters.area.polygon.vertexCount, vertexPositions);
float brdfNorm = 1.f;
float3x3 inverseLTCMatrix = scn_sample_area_light_precomputed_data(v, n, surface.roughness, &brdfNorm, bakedDataTexture);
p = inverseLTCMatrix * p;
lightCenter = inverseLTCMatrix * lightCenter;
lightRight = inverseLTCMatrix * lightRight;
lightTop = inverseLTCMatrix * lightTop;
float specularAmount = brdfNorm * pbr_area_light_eval_polygon(p, lightCenter, lightRight, lightTop, light.parameters.area.polygon.vertexCount, vertexPositions);
float3 effectiveAlbedo = mix(float3(1.0), float3(0.0), surface.metalness); // 1.f and not `albedo` because `SCNShaderLightingContribution.diffuse` will be multiplied by `pbr_surface.albedo` later in `scn_pbr_combine`
float3 reflectance = mix(float3(PBR_F0_NON_METALLIC), surface.diffuse.rgb, surface.metalness);
float3 lightColor = light.color.rgb;
diffuse += diffuseAmount * lightColor * effectiveAlbedo;
specular += specularAmount * lightColor * reflectance;
#endif
}
void add_area_line(scn_light light, texture2d_array<float> bakedDataTexture)
{
#ifdef USE_PBR
float3 v = surface.view;
float3 n = surface.normal;
float3 p = surface.position;
// construct orthonormal basis around N
float3 tangent = normalize(v - n * dot(v, n));
float3 bitangent = cross(n, tangent);
float3x3 shadingSpaceTransform = transpose(float3x3(tangent, n, bitangent));
float3 lightCenter = light.shadowMatrix[3].xyz;
float3 lightRight = light.shadowMatrix[0].xyz * light.parameters.area.line.halfLength;
float2x3 cornerDirections = float2x3((lightCenter + lightRight) - p,
(lightCenter - lightRight) - p);
cornerDirections[0] = shadingSpaceTransform * cornerDirections[0];
cornerDirections[1] = shadingSpaceTransform * cornerDirections[1];
float diffuseAmount = pbr_area_light_eval_line(cornerDirections);
float brdfNorm = 1.f;
float3x3 inverseLTCMatrix = scn_sample_area_light_precomputed_data(v, n, surface.roughness, &brdfNorm, bakedDataTexture);
cornerDirections[0] = inverseLTCMatrix * cornerDirections[0];
cornerDirections[1] = inverseLTCMatrix * cornerDirections[1];
float specularAmount = brdfNorm * pbr_area_light_eval_line(cornerDirections);
float3 ortho = normalize(cross(cornerDirections[0], cornerDirections[1]));
float ltcWidthFactor = 1.0 / length(scn_ltc_matrix_invert_transpose(inverseLTCMatrix) * ortho);
specularAmount *= ltcWidthFactor;
float3 lightColor = light.color.rgb;
diffuse += diffuseAmount * lightColor;
specular += specularAmount * lightColor * reflectance;
#endif
}
void add_area_ellipse(scn_light light, texture2d_array<float> bakedDataTexture)
{
#ifdef USE_PBR
#endif
}
void add_area_ellipsoid(scn_light light, texture2d_array<float> bakedDataTexture)
{
#ifdef USE_PBR
#endif
}
};
#endif // #if defined(__METAL_VERSION__) && __METAL_VERSION__ >= 120
enum C3DColorMask {
kC3DColorMaskRed = 0x1 << 3,
kC3DColorMaskGreen = 0x1 << 2,
kC3DColorMaskBlue = 0x1 << 1,
kC3DColorMaskAlpha = 0x1 << 0
};
inline float4 colorFromMask(float4 col, int mask)
{
switch (mask) {
case kC3DColorMaskRed: return col.r;
case kC3DColorMaskRed|kC3DColorMaskGreen: return float4(col.rg, 0.f, 1.f);
case kC3DColorMaskRed|kC3DColorMaskBlue: return float4(col.rb, 0.f, 1.f);
case kC3DColorMaskRed|kC3DColorMaskAlpha: return float4(col.ra, 0.f, 1.f);
case kC3DColorMaskGreen: return col.g;
case kC3DColorMaskGreen|kC3DColorMaskBlue: return float4(col.bg, 0.f, 1.f);
case kC3DColorMaskGreen|kC3DColorMaskAlpha: return float4(col.ag, 0.f, 1.f);
case kC3DColorMaskBlue: return col.b;
case kC3DColorMaskBlue|kC3DColorMaskAlpha: return float4(col.ab, 0.f, 1.f);
case kC3DColorMaskAlpha: return col.a;
}
return col;
}
#ifndef USE_PBR
inline float3 illuminate(SCNShaderSurface surface, SCNShaderLightingContribution lighting)
{
float3 albedo = surface.diffuse.rgb * surface.ambientOcclusion;
float3 color = lighting.diffuse * albedo;
#if defined(USE_AMBIENT_LIGHTING) && (defined(LOCK_AMBIENT_WITH_DIFFUSE) || defined(USE_AMBIENT_AS_AMBIENTOCCLUSION))
color += lighting.ambient * albedo;
#endif
#ifdef USE_SELFILLUMINATION
color += surface.diffuse.rgb * surface.selfIllumination.rgb;
#endif
// Do we want to clamp there ????
#ifdef USE_SPECULAR
float3 S = lighting.specular;
#elif defined(USE_REFLECTIVE)
float3 S = float3(0.);
#endif
#ifdef USE_REFLECTIVE
S += surface.reflective.rgb * surface.ambientOcclusion;
#endif
#ifdef USE_SPECULAR
S *= surface.specular.rgb;
#endif
#if (defined(USE_SPECULAR) || defined(USE_REFLECTIVE)) && !defined(DISABLE_SPECULAR)
color += S;
#endif
#if defined(USE_AMBIENT) && !defined(USE_AMBIENT_AS_AMBIENTOCCLUSION)
color += surface.ambient.rgb * lighting.ambient;
#endif
#ifdef USE_EMISSION
color += surface.emission.rgb;
#endif
#ifdef USE_MULTIPLY
color *= surface.multiply.rgb;
#endif
#ifdef USE_MODULATE
color *= lighting.modulate;
#endif
return color;
}
#endif
struct SCNShaderGeometry
{
float4 position;
float3 normal;
float4 tangent;
float4 color;
float pointSize;
float2 texcoords[8]; // MAX_UV
};
struct commonprofile_uniforms {
// [id(0)]]
float4 diffuseColor;
float4 specularColor;
float4 ambientColor;
float4 emissionColor;
float4 selfIlluminationColor;
float4 reflectiveColor;
float4 multiplyColor;
float4 transparentColor;
float clearCoat;
float clearCoatRoughness;
float3 clearCoatNormal;
float metalness;
// [id(12)]]
float roughness;
float diffuseIntensity;
float specularIntensity;
float normalIntensity;
float ambientIntensity;
float emissionIntensity;
float selfIlluminationIntensity;
float reflectiveIntensity;
float multiplyIntensity;
float transparentIntensity;
// [id(22)]]
float metalnessIntensity;
float roughnessIntensity;
float clearCoatIntensity;
float clearCoatRoughnessIntensity;
float clearCoatNormalIntensity;
float displacementIntensity;
float materialShininess;
float selfIlluminationOcclusion;
float transparency;
float3 fresnel; // x: ((n1-n2)/(n1+n2))^2 y:1-x z:exponent
#if USE_ARGUMENT_BUFFERS
//[[id(32)]]
texture2d<float> emissionTexture;
sampler emissionSampler;
texture2d<float> ambientTexture;
sampler ambientSampler;
//[[id(32)]]
texture2d<float> diffuseTexture;
sampler diffuseSampler;
texture2d<float> specularTexture;
sampler specularSampler;
#if defined(USE_REFLECTIVE_CUBEMAP)
texturecube<float> reflectiveTexture;
#else
texture2d<float> reflectiveTexture;
#endif
sampler reflectiveSampler;
texture2d<float> transparentTexture;
sampler transparentSampler;
texture2d<float> multiplyTexture;
sampler multiplySampler;
//[[id(43)]]
texture2d<float> normalTexture;
sampler normalSampler;
texture2d<float> selfIlluminationTexture;
sampler selfIlluminationSampler;
texture2d<float> metalnessTexture;
sampler metalnessSampler;
texture2d<float> roughnessTexture;
sampler roughnessSampler;
texture2d<float> displacementTexture;
sampler displacementSampler;
//[[id(53)]]
#endif // USE_ARGUMENT_BUFFERS
#ifdef TEXTURE_TRANSFORM_COUNT
float4x4 textureTransforms[TEXTURE_TRANSFORM_COUNT];
#endif
};
#ifdef USE_OPENSUBDIV
struct osd_packed_vertex {
packed_float3 position;
#if defined(OSD_USER_VARYING_DECLARE_PACKED)
OSD_USER_VARYING_DECLARE_PACKED
#endif
};
#endif
#ifdef USE_DISPLACEMENT_MAP
static void applyDisplacement(texture2d<float> displacementTexture,
sampler displacementTextureSampler,
float2 displacementTexcoord,
thread SCNShaderGeometry& geometry,
constant commonprofile_uniforms& scn_commonprofile)
{
#ifdef USE_DISPLACEMENT_TEXTURE_COMPONENT
float altitude = colorFromMask(displacementTexture.sample(displacementTextureSampler, displacementTexcoord), USE_DISPLACEMENT_TEXTURE_COMPONENT).r;
#ifdef USE_DISPLACEMENT_INTENSITY
altitude *= scn_commonprofile.displacementIntensity;
#endif
#if defined(USE_NORMAL) && defined(HAS_OR_GENERATES_NORMAL)
float3 bitangent = geometry.tangent.w * normalize(cross(geometry.tangent.xyz, geometry.normal.xyz));
geometry.position.xyz += geometry.normal * altitude;
float3 offset = float3(1.f / displacementTexture.get_width(), 1.f / displacementTexture.get_height(), 0.f);
float3 h;
h.x = colorFromMask(displacementTexture.sample(displacementTextureSampler, displacementTexcoord), USE_DISPLACEMENT_TEXTURE_COMPONENT).r;
h.y = colorFromMask(displacementTexture.sample(displacementTextureSampler, displacementTexcoord+offset.xz), USE_DISPLACEMENT_TEXTURE_COMPONENT).r;
h.z = colorFromMask(displacementTexture.sample(displacementTextureSampler, displacementTexcoord-offset.zy), USE_DISPLACEMENT_TEXTURE_COMPONENT).r;
#ifdef USE_DISPLACEMENT_INTENSITY
h *= scn_commonprofile.displacementIntensity;
#endif
float3 n = normalize( float3( (h.x - h.y)/offset.x, 1., (h.x - h.z)/offset.y) );
geometry.normal = geometry.tangent.xyz * n.x + geometry.normal.xyz * n.y + bitangent.xyz * n.z;
geometry.tangent.xyz = normalize(cross(bitangent, geometry.normal));
#endif // USE_NORMAL
#else // USE_DISPLACEMENT_TEXTURE_COMPONENT
float3 displacement = displacementTexture.sample(displacementTextureSampler, displacementTexcoord).rgb;
#ifdef USE_DISPLACEMENT_INTENSITY
displacement *= scn_commonprofile.displacementIntensity;
#endif
#if defined(USE_NORMAL) && defined(HAS_OR_GENERATES_NORMAL)
float3 bitangent = geometry.tangent.w * normalize(cross(geometry.tangent.xyz, geometry.normal.xyz));
geometry.position.xyz += geometry.tangent.xyz * displacement.x + geometry.normal.xyz * displacement.y + bitangent.xyz * displacement.z;
float3 offset = float3(1.f / displacementTexture.get_width(), 1.f / displacementTexture.get_height(), 0.f);
float3 a = displacementTexture.sample(displacementTextureSampler, displacementTexcoord).rgb;
float3 b = displacementTexture.sample(displacementTextureSampler, displacementTexcoord+offset.xz).rgb;
float3 c = displacementTexture.sample(displacementTextureSampler, displacementTexcoord+offset.zy).rgb;
#ifdef USE_DISPLACEMENT_INTENSITY
a *= scn_commonprofile.displacementIntensity;
b *= scn_commonprofile.displacementIntensity;
c *= scn_commonprofile.displacementIntensity;
#endif
b += offset.xzz;
c -= offset.zzy;
float3 n = (normalize( cross( b-a, c-a ) ));
geometry.normal = geometry.tangent.xyz * n.x + geometry.normal.xyz * n.y + bitangent.xyz * n.z;
geometry.tangent.xyz = normalize(cross(bitangent, geometry.normal));
#endif // USE_NORMAL
#endif // USE_DISPLACEMENT_TEXTURE_COMPONENT
}
#endif // USE_DISPLACEMENT_MAP
#ifdef USE_OUTLINE
static inline float hash(float2 p)
{
const float2 kMod2 = float2(443.8975f, 397.2973f);
p = fract(p * kMod2);
p += dot(p.xy, p.yx+19.19f);
return fract(p.x * p.y);
}
#endif
} // namespace
using namespace NAMESPACE_HASH;
//
// MARK: - Vertex and post-tessellation vertex functions
//
#if defined(USE_TESSELLATION)
struct scn_patch_t {
patch_control_point<scn_vertex_t> controlPoints;
};
#endif
#if defined(USE_OPENSUBDIV)
#if OSD_IS_ADAPTIVE
[[ patch(quad, VERTEX_CONTROL_POINTS_PER_PATCH) ]]
#endif
#elif defined(USE_TESSELLATION)
[[ patch(triangle, 3) ]]
#endif
vertex commonprofile_io commonprofile_vert(
#if !defined(USE_TESSELLATION)
scn_vertex_t in [[ stage_in ]]
, uint scn_vertexID [[ vertex_id ]]
#else // USE_TESSELLATION
#ifdef USE_OPENSUBDIV
#if OSD_IS_ADAPTIVE
#if USE_STAGE_IN
PatchInput patchInput [[ stage_in ]]
#else
OsdVertexBufferSet patchInput
#endif
, float2 patchCoord [[ position_in_patch ]]
, uint patchID [[ patch_id ]]
, constant float& osdTessellationLevel [[ buffer(TESSELLATION_LEVEL_BUFFER_INDEX) ]]
#else // OSD_IS_ADAPTIVE
device unsigned const* osdIndicesBuffer [[ buffer(INDICES_BUFFER_INDEX) ]]
, device osd_packed_vertex const* osdVertexBuffer [[ buffer(VERTEX_BUFFER_INDEX) ]]
, uint vertexID [[ vertex_id ]]
#endif // OSD_IS_ADAPTIVE
#if defined(OSD_FVAR_WIDTH)
#if OSD_FVAR_USES_MULTIPLE_CHANNELS
, constant uint32_t& osdFaceVaryingChannelCount [[ buffer(OSD_FVAR_CHANNELS_CHANNEL_COUNT_INDEX) ]]
, device OsdFVarChannelDesc const* osdFaceVaryingChannelDescriptors [[ buffer(OSD_FVAR_CHANNELS_CHANNEL_DESCRIPTORS_INDEX) ]]
, constant uint32_t& osdFaceVaryingPatchArrayIndex [[ buffer(OSD_FVAR_CHANNELS_PATCH_ARRAY_INDEX_BUFFER_INDEX) ]]
, device void const* osdFaceVaryingChannelsPackedData [[ buffer(OSD_FVAR_CHANNELS_PACKED_DATA_BUFFER_INDEX) ]]
#else
, device float const* osdFaceVaryingData [[ buffer(OSD_FVAR_DATA_BUFFER_INDEX) ]]
, device int const* osdFaceVaryingIndices [[ buffer(OSD_FVAR_INDICES_BUFFER_INDEX) ]]
#if OSD_IS_ADAPTIVE
, device packed_int3 const* osdFaceVaryingPatchParams [[ buffer(OSD_FVAR_PATCHPARAM_BUFFER_INDEX) ]]
, constant packed_int4& osdFaceVaryingPatchArray [[ buffer(OSD_FVAR_PATCH_ARRAY_BUFFER_INDEX) ]]
#endif
#endif //OSD_FVAR_USES_MULTIPLE_CHANNELS
#endif //defined(OSD_FVAR_WIDTH)
#else // USE_OPENSUBDIV
scn_patch_t in [[ stage_in ]]
, float3 patchCoord [[ position_in_patch ]]
#endif // USE_OPENSUBDIV
#endif // USE_TESSELLATION
#ifdef USE_MULTIPLE_RENDERING
, device SCNSceneBuffer* scn_frames [[ buffer(0) ]]
#else
, constant SCNSceneBuffer& scn_frame [[ buffer(0) ]]
#endif
#ifdef USE_INSTANCING
// we use device here to override the 64Ko limit of constant buffers on NV hardware
, device commonprofile_node* scn_nodeInstances [[ buffer(1) ]]
#else
, constant commonprofile_node& scn_node [[ buffer(1) ]]
#endif
#ifdef USE_PER_VERTEX_LIGHTING
, constant scn_light* scn_lights [[ buffer(2) ]]
, constant float4* u_shadowKernel
, texture2d_array<float> u_areaLightBakedDataTexture
#endif
// used for texture transform and materialShininess in case of perVertexLighting
, constant commonprofile_uniforms& scn_commonprofile
, uint scn_instanceID [[ instance_id ]]
#ifdef USE_POINT_RENDERING
// x:pointSize, y:minimumScreenSize, z:maximumScreenSize
, constant float3& scn_pointSize
#endif
#ifdef USE_DISPLACEMENT_MAP
#if USE_ARGUMENT_BUFFERS
#define u_displacementTexture scn_commonprofile.displacementTexture
#define u_displacementTextureSampler scn_commonprofile.displacementSampler
#else
, texture2d<float> u_displacementTexture
, sampler u_displacementTextureSampler
#endif //USE_ARGUMENT_BUFFERS
#endif //USE_DISPLACEMENT_MAP
#ifdef USE_VERTEX_EXTRA_ARGUMENTS
#endif
)
{
commonprofile_io out;
#ifdef USE_MULTIPLE_RENDERING
out.sliceIndex = scn_instanceID % USE_MULTIPLE_RENDERING;
device SCNSceneBuffer& scn_frame = scn_frames[0];
device SCNSceneBuffer& scn_frame_slice = scn_frames[out.sliceIndex];
#ifdef USE_INSTANCING
device commonprofile_node& scn_node = scn_nodeInstances[scn_instanceID / USE_MULTIPLE_RENDERING];
#endif
#else
#ifdef USE_INSTANCING
device commonprofile_node& scn_node = scn_nodeInstances[scn_instanceID];
#endif
#endif
#ifdef USE_TESSELLATION
uint scn_vertexID; // we need scn_vertexID if a geometry modifier is used
scn_vertexID = 0;
#endif
//
// MARK: Populating the `_geometry` struct
//
SCNShaderGeometry _geometry;
#if !defined(USE_TESSELLATION)
// OPTIM in could be already float4?
_geometry.position = float4(in.position, 1.f);
#if defined(USE_NORMAL) && defined(HAS_NORMAL)
_geometry.normal = in.normal;
#endif
#if defined(USE_TANGENT) || defined(USE_BITANGENT)
_geometry.tangent = in.tangent;
#endif
#ifdef NEED_IN_TEXCOORD0
_geometry.texcoords[0] = in.texcoord0;
#endif
#ifdef NEED_IN_TEXCOORD1
_geometry.texcoords[1] = in.texcoord1;
#endif
#ifdef NEED_IN_TEXCOORD2
_geometry.texcoords[2] = in.texcoord2;
#endif
#ifdef NEED_IN_TEXCOORD3
_geometry.texcoords[3] = in.texcoord3;
#endif
#ifdef NEED_IN_TEXCOORD4
_geometry.texcoords[4] = in.texcoord4;
#endif
#ifdef NEED_IN_TEXCOORD5
_geometry.texcoords[5] = in.texcoord5;
#endif
#ifdef NEED_IN_TEXCOORD6
_geometry.texcoords[6] = in.texcoord6;
#endif
#ifdef NEED_IN_TEXCOORD7
_geometry.texcoords[7] = in.texcoord7;
#endif
#ifdef HAS_VERTEX_COLOR
_geometry.color = in.color;
#elif USE_VERTEX_COLOR
_geometry.color = float4(1.);
#endif
#else // USE_TESSELLATION
#ifdef USE_OPENSUBDIV
#if OSD_IS_ADAPTIVE
#if USE_STAGE_IN
int3 patchParam = patchInput.patchParam;
#else
int3 patchParam = patchInput.patchParamBuffer[patchID];
#endif
int refinementLevel = OsdGetPatchRefinementLevel(patchParam);
float tessellationLevel = min(osdTessellationLevel, (float)OSD_MAX_TESS_LEVEL) / exp2((float)refinementLevel - 1);
OsdPatchVertex patchVertex = OsdComputePatch(tessellationLevel, patchCoord, patchID, patchInput);
#if defined(OSD_FVAR_WIDTH)
int patchIndex = OsdGetPatchIndex(patchID);
#if OSD_FVAR_USES_MULTIPLE_CHANNELS
OsdInterpolateFaceVarings(_geometry, patchCoord.xy, patchIndex, osdFaceVaryingChannelCount, osdFaceVaryingChannelDescriptors, osdFaceVaryingPatchArrayIndex, osdFaceVaryingChannelsPackedData);
#else
OsdInterpolateFaceVarings(_geometry, patchCoord.xy, patchIndex, osdFaceVaryingIndices, osdFaceVaryingData, osdFaceVaryingPatchParams, osdFaceVaryingPatchArray);
#endif
#endif
_geometry.position = float4(patchVertex.position, 1.f);
#if defined(USE_NORMAL)
_geometry.normal = patchVertex.normal;
#endif
#if defined(USE_TANGENT) || defined(USE_BITANGENT)
_geometry.tangent = float4(patchVertex.tangent, -1.f);
//_geometry.bitangent = patchVertex.bitangent;
#endif
#if defined(NEED_IN_TEXCOORD0) && (OSD_TEXCOORD0_INTERPOLATION_MODE == OSD_PRIMVAR_INTERPOLATION_MODE_USER_VARYING)
_geometry.texcoords[0] = patchVertex.texcoord0;
#endif
#if defined(NEED_IN_TEXCOORD1) && (OSD_TEXCOORD1_INTERPOLATION_MODE == OSD_PRIMVAR_INTERPOLATION_MODE_USER_VARYING)
_geometry.texcoords[1] = patchVertex.texcoord1;
#endif
#if defined(NEED_IN_TEXCOORD2) && (OSD_TEXCOORD2_INTERPOLATION_MODE == OSD_PRIMVAR_INTERPOLATION_MODE_USER_VARYING)
_geometry.texcoords[2] = patchVertex.texcoord2;
#endif
#if defined(NEED_IN_TEXCOORD3) && (OSD_TEXCOORD3_INTERPOLATION_MODE == OSD_PRIMVAR_INTERPOLATION_MODE_USER_VARYING)
_geometry.texcoords[3] = patchVertex.texcoord3;
#endif
#if defined(NEED_IN_TEXCOORD4) && (OSD_TEXCOORD4_INTERPOLATION_MODE == OSD_PRIMVAR_INTERPOLATION_MODE_USER_VARYING)
_geometry.texcoords[4] = patchVertex.texcoord4;
#endif
#if defined(NEED_IN_TEXCOORD5) && (OSD_TEXCOORD5_INTERPOLATION_MODE == OSD_PRIMVAR_INTERPOLATION_MODE_USER_VARYING)
_geometry.texcoords[5] = patchVertex.texcoord5;
#endif
#if defined(NEED_IN_TEXCOORD6) && (OSD_TEXCOORD6_INTERPOLATION_MODE == OSD_PRIMVAR_INTERPOLATION_MODE_USER_VARYING)
_geometry.texcoords[6] = patchVertex.texcoord6;
#endif
#if defined(NEED_IN_TEXCOORD7) && (OSD_TEXCOORD7_INTERPOLATION_MODE == OSD_PRIMVAR_INTERPOLATION_MODE_USER_VARYING)
_geometry.texcoords[7] = patchVertex.texcoord7;
#endif
#if defined(HAS_VERTEX_COLOR) && (OSD_COLOR_INTERPOLATION_MODE == OSD_PRIMVAR_INTERPOLATION_MODE_USER_VARYING)
_geometry.color = patchVertex.color;
#endif
#else // OSD_IS_ADAPTIVE
#if OSD_PATCH_QUADS
const uint primitiveIndex = vertexID / 6;
#ifdef USE_NORMAL
float3 p0 = osdVertexBuffer[osdIndicesBuffer[primitiveIndex * 4 + 0]].position;
float3 p1 = osdVertexBuffer[osdIndicesBuffer[primitiveIndex * 4 + 1]].position;
float3 p2 = osdVertexBuffer[osdIndicesBuffer[primitiveIndex * 4 + 2]].position;
float3 normal = normalize(cross(p2 - p1, p0 - p1));
#endif
const uint triangleIndices[6] = { 0, 1, 2, 0, 2, 3 };
const uint quadVertexIndex = triangleIndices[vertexID % 6];
osd_packed_vertex osdVertex = osdVertexBuffer[osdIndicesBuffer[primitiveIndex * 4 + quadVertexIndex]];
#elif OSD_PATCH_TRIANGLES
const uint primitiveIndex = vertexID / 3;
#ifdef USE_NORMAL
float3 p0 = osdVertexBuffer[osdIndicesBuffer[primitiveIndex * 3 + 0]].position;
float3 p1 = osdVertexBuffer[osdIndicesBuffer[primitiveIndex * 3 + 1]].position;
float3 p2 = osdVertexBuffer[osdIndicesBuffer[primitiveIndex * 3 + 2]].position;
float3 normal = normalize(cross(p2 - p1, p0 - p1));
#endif
osd_packed_vertex osdVertex = osdVertexBuffer[osdIndicesBuffer[vertexID]];
#endif
float3 position = osdVertex.position;
#if defined(OSD_FVAR_WIDTH)
int patchIndex = OsdGetPatchIndex(primitiveIndex);
#if OSD_PATCH_QUADS
float2 quadUVs[4] = { float2(0,0), float2(1,0), float2(1,1), float2(0,1) };
#if OSD_FVAR_USES_MULTIPLE_CHANNELS
OsdInterpolateFaceVarings(_geometry, quadUVs[quadVertexIndex], patchIndex, osdFaceVaryingChannelCount, osdFaceVaryingChannelDescriptors, osdFaceVaryingPatchArrayIndex, osdFaceVaryingChannelsPackedData);
#else
OsdInterpolateFaceVarings(_geometry, quadUVs[quadVertexIndex], patchIndex, osdFaceVaryingIndices, osdFaceVaryingData);
#endif
#elif OSD_PATCH_TRIANGLES
//TODO
#endif
#endif //defined(OSD_FVAR_WIDTH)
#if defined(NEED_IN_TEXCOORD0) && (OSD_TEXCOORD0_INTERPOLATION_MODE == OSD_PRIMVAR_INTERPOLATION_MODE_USER_VARYING)
_geometry.texcoords[0] = osdVertex.texcoord0;
#endif
#if defined(NEED_IN_TEXCOORD1) && (OSD_TEXCOORD1_INTERPOLATION_MODE == OSD_PRIMVAR_INTERPOLATION_MODE_USER_VARYING)
_geometry.texcoords[1] = osdVertex.texcoord1;
#endif
#if defined(NEED_IN_TEXCOORD2) && (OSD_TEXCOORD2_INTERPOLATION_MODE == OSD_PRIMVAR_INTERPOLATION_MODE_USER_VARYING)
_geometry.texcoords[2] = osdVertex.texcoord2;
#endif
#if defined(NEED_IN_TEXCOORD3) && (OSD_TEXCOORD3_INTERPOLATION_MODE == OSD_PRIMVAR_INTERPOLATION_MODE_USER_VARYING)
_geometry.texcoords[3] = osdVertex.texcoord3;
#endif
#if defined(NEED_IN_TEXCOORD4) && (OSD_TEXCOORD4_INTERPOLATION_MODE == OSD_PRIMVAR_INTERPOLATION_MODE_USER_VARYING)
_geometry.texcoords[4] = osdVertex.texcoord4;
#endif
#if defined(NEED_IN_TEXCOORD5) && (OSD_TEXCOORD5_INTERPOLATION_MODE == OSD_PRIMVAR_INTERPOLATION_MODE_USER_VARYING)
_geometry.texcoords[5] = osdVertex.texcoord5;
#endif
#if defined(NEED_IN_TEXCOORD6) && (OSD_TEXCOORD6_INTERPOLATION_MODE == OSD_PRIMVAR_INTERPOLATION_MODE_USER_VARYING)
_geometry.texcoords[6] = osdVertex.texcoord6;
#endif
#if defined(NEED_IN_TEXCOORD7) && (OSD_TEXCOORD7_INTERPOLATION_MODE == OSD_PRIMVAR_INTERPOLATION_MODE_USER_VARYING)
_geometry.texcoords[7] = osdVertex.texcoord7;
#endif
#if defined(HAS_VERTEX_COLOR) && (OSD_COLOR_INTERPOLATION_MODE == OSD_PRIMVAR_INTERPOLATION_MODE_USER_VARYING)
_geometry.color = osdVertex.color;
#endif
_geometry.position = float4(position, 1.f);
#ifdef USE_NORMAL
_geometry.normal = normal;
#endif
#endif // OSD_IS_ADAPTIVE
#else // USE_OPENSUBDIV
//
// MARK: Geometry smooting
//
#if defined(TESSELLATION_SMOOTHING_MODE_PN_TRIANGLE) || defined(TESSELLATION_SMOOTHING_MODE_PHONG)
float3 P0 = in.controlPoints[0].position;
float3 P1 = in.controlPoints[1].position;
float3 P2 = in.controlPoints[2].position;
float3 N0 = in.controlPoints[0].normal;
float3 N1 = in.controlPoints[1].normal;
float3 N2 = in.controlPoints[2].normal;
#if defined(TESSELLATION_SMOOTHING_MODE_PN_TRIANGLE)
float3 position, normal;
scn_smooth_geometry_pn_triangle(position, normal, patchCoord, P0, P1, P2, N0, N1, N2);
#elif defined(TESSELLATION_SMOOTHING_MODE_PHONG)
float3 position, normal;
scn_smooth_geometry_phong(position, normal, patchCoord, P0, P1, P2, N0, N1, N2);
#endif
_geometry.position = float4(position, 1.f);
#ifdef USE_NORMAL
_geometry.normal = normal;
#endif
#else // GEOMETRY_SMOOTHING
// OPTIM in could be already float4?
_geometry.position = float4(scn::barycentric_mix(in.controlPoints[0].position, in.controlPoints[1].position, in.controlPoints[2].position, patchCoord), 1.f);
#if defined(USE_NORMAL) && defined(HAS_NORMAL)
_geometry.normal = normalize(scn::barycentric_mix(in.controlPoints[0].normal, in.controlPoints[1].normal, in.controlPoints[2].normal, patchCoord));
#endif
#endif // GEOMETRY_SMOOTHING
#if defined(USE_TANGENT) || defined(USE_BITANGENT)
_geometry.tangent = normalize(scn::barycentric_mix(in.controlPoints[0].tangent, in.controlPoints[1].tangent, in.controlPoints[2].tangent, patchCoord));
#endif
#ifdef NEED_IN_TEXCOORD0
_geometry.texcoords[0] = scn::barycentric_mix(in.controlPoints[0].texcoord0, in.controlPoints[1].texcoord0, in.controlPoints[2].texcoord0, patchCoord);
#endif
#ifdef NEED_IN_TEXCOORD1
_geometry.texcoords[1] = scn::barycentric_mix(in.controlPoints[0].texcoord1, in.controlPoints[1].texcoord1, in.controlPoints[2].texcoord1, patchCoord);
#endif
#ifdef NEED_IN_TEXCOORD2
_geometry.texcoords[2] = scn::barycentric_mix(in.controlPoints[0].texcoord2, in.controlPoints[1].texcoord2, in.controlPoints[2].texcoord2, patchCoord);
#endif
#ifdef NEED_IN_TEXCOORD3
_geometry.texcoords[3] = scn::barycentric_mix(in.controlPoints[0].texcoord3, in.controlPoints[1].texcoord3, in.controlPoints[2].texcoord3, patchCoord);
#endif
#ifdef NEED_IN_TEXCOORD4
_geometry.texcoords[4] = scn::barycentric_mix(in.controlPoints[0].texcoord4, in.controlPoints[1].texcoord4, in.controlPoints[2].texcoord4, patchCoord);
#endif
#ifdef NEED_IN_TEXCOORD5
_geometry.texcoords[5] = scn::barycentric_mix(in.controlPoints[0].texcoord5, in.controlPoints[1].texcoord5, in.controlPoints[2].texcoord5, patchCoord);
#endif
#ifdef NEED_IN_TEXCOORD6
_geometry.texcoords[6] = scn::barycentric_mix(in.controlPoints[0].texcoord6, in.controlPoints[1].texcoord6, in.controlPoints[2].texcoord6, patchCoord);
#endif
#ifdef NEED_IN_TEXCOORD7
_geometry.texcoords[7] = scn::barycentric_mix(in.controlPoints[0].texcoord7, in.controlPoints[1].texcoord7, in.controlPoints[2].texcoord7, patchCoord);
#endif
#ifdef HAS_VERTEX_COLOR
_geometry.color = scn::barycentric_mix(in.controlPoints[0].color, in.controlPoints[1].color, in.controlPoints[2].color, patchCoord);
#elif USE_VERTEX_COLOR
_geometry.color = float4(1.);
#endif
#endif // USE_OPENSUBDIV
#endif // USE_TESSELLATION
#ifdef USE_POINT_RENDERING
_geometry.pointSize = scn_pointSize.x;
#endif
#ifdef USE_TEXCOORD
#endif
#ifdef USE_DISPLACEMENT_MAP
applyDisplacement(u_displacementTexture, u_displacementTextureSampler, _displacementTexcoord, _geometry, scn_commonprofile);
#endif
//
// MARK: Skinning
//
#ifdef USE_SKINNING
#if !defined(USE_TESSELLATION)
{
float3 pos = 0.f;
#if defined(USE_NORMAL) && defined(HAS_NORMAL)
float3 nrm = 0.f;
#endif
#if defined(USE_TANGENT) || defined(USE_BITANGENT)
float3 tgt = 0.f;
#endif
for (int i = 0; i < MAX_BONE_INFLUENCES; ++i) {
#if MAX_BONE_INFLUENCES == 1
float weight = 1.f;
#else
float weight = in.skinningWeights[i];
if (weight <= 0.f)
continue;
#endif
int idx = int(in.skinningJoints[i]) * 3;
float4x4 jointMatrix = float4x4(scn_node.skinningJointMatrices[idx],
scn_node.skinningJointMatrices[idx+1],
scn_node.skinningJointMatrices[idx+2],
float4(0., 0., 0., 1.));
pos += (_geometry.position * jointMatrix).xyz * weight;
#if defined(USE_NORMAL) && defined(HAS_NORMAL)
nrm += _geometry.normal * scn::mat3(jointMatrix) * weight;
#endif
#if defined(USE_TANGENT) || defined(USE_BITANGENT)
tgt += _geometry.tangent.xyz * scn::mat3(jointMatrix) * weight;
#endif
}
_geometry.position.xyz = pos;
#if defined(USE_NORMAL) && defined(HAS_NORMAL)
_geometry.normal = nrm;
#endif
#if defined(USE_TANGENT) || defined(USE_BITANGENT)
_geometry.tangent.xyz = tgt;
#endif
}
#else // USE_TESSELLATION
#if !defined(USE_OPENSUBDIV)
{
float3 pos[3] = {0.f, 0.f, 0.f};
#if defined(USE_NORMAL) && defined(HAS_NORMAL)
float3 nrm[3] = {0.f, 0.f, 0.f};
#endif
#if defined(USE_TANGENT) || defined(USE_BITANGENT)
float3 tgt[3] = {0.f, 0.f, 0.f};
#endif
for (int controlPointIndex = 0; controlPointIndex < 3; ++controlPointIndex) {
for (int i = 0; i < MAX_BONE_INFLUENCES; ++i) {
#if MAX_BONE_INFLUENCES == 1
float weight = 1.f;
#else
float weight = in.controlPoints[controlPointIndex].skinningWeights[i];
if (weight <= 0.f)
continue;
#endif
int idx = int(in.controlPoints[controlPointIndex].skinningJoints[i]) * 3;
float4x4 jointMatrix = float4x4(scn_node.skinningJointMatrices[idx],
scn_node.skinningJointMatrices[idx+1],
scn_node.skinningJointMatrices[idx+2],
float4(0., 0., 0., 1.));
pos[controlPointIndex] += (_geometry.position * jointMatrix).xyz * weight;
#if defined(USE_NORMAL) && defined(HAS_NORMAL)
nrm[controlPointIndex] += _geometry.normal * scn::mat3(jointMatrix) * weight;
#endif
#if defined(USE_TANGENT) || defined(USE_BITANGENT)
tgt[controlPointIndex] += _geometry.tangent.xyz * scn::mat3(jointMatrix) * weight;
#endif
}
}
_geometry.position.xyz = scn::barycentric_mix(pos[0], pos[1], pos[2], patchCoord);
#if defined(USE_NORMAL) && defined(HAS_NORMAL)
_geometry.normal = scn::barycentric_mix(nrm[0], nrm[1], nrm[2], patchCoord);
#endif
#if defined(USE_TANGENT) || defined(USE_BITANGENT)
_geometry.tangent.xyz = scn::barycentric_mix(tgt[0], tgt[1], tgt[2], patchCoord);
#endif
}
#endif // !defined(USE_OPENSUBDIV)
#endif // USE_TESSELLATION
#endif // USE_SKINNING
#ifdef USE_DISPLACEMENT_MAP
out.displacementTexcoord = _displacementTexcoord;
#endif
//
// MARK: Geometry shader modifier
//
#ifdef USE_GEOMETRY_MODIFIER
// DoGeometryModifier START
// DoGeometryModifier END
#endif
//
// MARK: Populating the `_surface` struct
//
// Transform the geometry elements in view space
#if defined(USE_POSITION) || (defined(USE_NORMAL) && defined(HAS_OR_GENERATES_NORMAL)) || defined(USE_TANGENT) || defined(USE_BITANGENT) || defined(USE_INSTANCING)
SCNShaderSurface _surface;
#endif
#if defined(USE_POSITION) || defined(USE_INSTANCING)
#ifdef USE_MULTIPLE_RENDERING
_surface.position = (scn_frame.viewTransform * (scn_node.modelTransform * _geometry.position)).xyz;
#else
_surface.position = (scn_node.modelViewTransform * _geometry.position).xyz;
#endif
#endif
#if defined(USE_NORMAL) && defined(HAS_OR_GENERATES_NORMAL)
#ifdef USE_MULTIPLE_RENDERING
#ifdef HINT_UNIFORM_SCALE
_surface.normal = (scn_frame.viewTransform * scn_node.modelTransform * float4(_geometry.normal,0.)).xyz;
#else
_surface.normal = normalize( (scn_frame.inverseTransposeViewTransform * scn_node.modelTransform * float4(_geometry.normal,0.)).xyz );
#endif
#else
float3x3 nrmTransform = scn::mat3(scn_node.modelViewTransform);
#ifdef HINT_UNIFORM_SCALE
_surface.normal = nrmTransform * _geometry.normal;
#else
float3 invScaleSquared = 1.f / float3(length_squared(nrmTransform[0]), length_squared(nrmTransform[1]), length_squared(nrmTransform[2]));
_surface.normal = normalize(nrmTransform * (_geometry.normal * invScaleSquared));
#endif
#endif
#endif
#if defined(USE_TANGENT) || defined(USE_BITANGENT)
#ifdef USE_MULTIPLE_RENDERING
_surface.tangent = normalize( (scn_frame.viewTransform * scn_node.modelTransform * float4(_geometry.tangent.xyz, 0.f)).xyz );
#else
_surface.tangent = normalize(scn::mat3(scn_node.modelViewTransform) * _geometry.tangent.xyz);
#endif
_surface.bitangent = _geometry.tangent.w * cross(_surface.tangent, _surface.normal); // no need to renormalize since tangent and normal should be orthogonal
// old code : _surface.bitangent = normalize(cross(_surface.normal,_surface.tangent));
#endif
//if USE_VIEW is 2 we may also need to set _surface.view. todo: make USE_VIEW a mask
#ifdef USE_VIEW
_surface.view = normalize(-_surface.position);
#endif
//
// MARK: Per-vertex lighting
//
#ifdef USE_PER_VERTEX_LIGHTING
// Lighting
SCNShaderLightingContribution _lightingContribution(_surface, out);
_lightingContribution.diffuse = 0.;
#ifdef USE_SPECULAR
_lightingContribution.specular = 0.;
_surface.shininess = scn_commonprofile.materialShininess;
#endif
out.diffuse = _lightingContribution.diffuse;
#ifdef USE_SPECULAR
out.specular = _lightingContribution.specular;
#endif
#endif
#if defined(USE_POSITION) && (USE_POSITION == 2)
out.position = _surface.position;
#endif
#if defined(USE_NORMAL) && (USE_NORMAL == 2) && defined(HAS_OR_GENERATES_NORMAL)
out.normal = _surface.normal;
#endif
#if defined(USE_TANGENT) && (USE_TANGENT == 2)
out.tangent = _surface.tangent;
#endif
#if defined(USE_BITANGENT) && (USE_BITANGENT == 2)
out.bitangent = _surface.bitangent;
#endif
#ifdef USE_VERTEX_COLOR
out.vertexColor = _geometry.color;
#endif
#if DEBUG_PIXEL
out.uv0 = in.texcoord0;
#endif
#ifdef USE_TEXCOORD
out.texcoord0 = _geometry.texcoords[0].xy;
#endif
//
// MARK: Determining the fragment position
//
#if defined(USE_POSITION) || defined(USE_INSTANCING)
#ifdef USE_MULTIPLE_RENDERING
out.fragmentPosition = scn_frame_slice.viewProjectionTransform * scn_node.modelTransform * _geometry.position;
#else
out.fragmentPosition = scn_frame.projectionTransform * float4(_surface.position, 1.);
#endif
#elif defined(USE_MODELVIEWPROJECTIONTRANSFORM) // this means that the geometry are still in model space : we can transform it directly to NDC space
#ifdef USE_MULTIPLE_RENDERING
out.fragmentPosition = scn_frame_slice.viewProjectionTransform * scn_node.modelTransform * _geometry.position;
#else
out.fragmentPosition = scn_node.modelViewProjectionTransform * _geometry.position;
#endif
#endif
#ifdef USE_NODE_OPACITY
out.nodeOpacity = scn_node.nodeOpacity;
#endif
#ifdef USE_POINT_RENDERING
float screenSize = _geometry.pointSize / out.fragmentPosition.w;
out.fragmentSize = clamp(screenSize, scn_pointSize.y, scn_pointSize.z);
#endif
#ifdef USE_MOTIONBLUR
float4 lastFrameFragmentPosition = scn_frame.lastFrameViewProjectionTransform * scn_node.lastFrameModelTransform * _geometry.position;
out.mv_fragment = out.fragmentPosition.xyw;
out.mv_lastFragment = lastFrameFragmentPosition.xyw;
#endif
#ifdef USE_OUTLINE
out.outlineHash = hash(scn_node.modelTransform[3].xy)+1.f/255.f;
#endif
return out;
}
//
// MARK: - Fragment shader function
//
struct SCNOutput
{
float4 color [[ color(0) ]];
#ifdef USE_COLOR1_OUTPUT
half4 color1 [[ color(1) ]];
#endif
#ifdef USE_NORMALS_OUTPUT
half4 normals [[ color(2) ]];
#endif
#ifdef USE_MOTIONBLUR
half4 motionblur [[ color(3) ]];
#endif
#ifdef USE_REFLECTANCE_ROUGHNESS_OUTPUT
half4 reflectanceRoughnessOutput [[ color(4) ]];
#endif
#ifdef USE_RADIANCE_OUTPUT
half4 radiance [[ color(5) ]];
#endif
};
fragment SCNOutput commonprofile_frag(commonprofile_io in [[ stage_in ]]
, constant commonprofile_uniforms& scn_commonprofile [[ buffer(0) ]]
#ifdef USE_MULTIPLE_RENDERING
, device SCNSceneBuffer* scn_frames [[ buffer(1) ]]
#else
, constant SCNSceneBuffer& scn_frame [[ buffer(1) ]]
#endif
, constant commonprofile_node& scn_node [[ buffer(2) ]]
#ifdef USE_PER_PIXEL_LIGHTING
, constant scn_light* scn_lights [[ buffer(3) ]]
, constant float4* u_shadowKernel
, texture2d_array<float> u_areaLightBakedDataTexture
#ifdef C3D_SUPPORT_CUBE_ARRAY
, texturecube_array<half> u_reflectionProbeTexture
#else
, texture2d_array<half> u_reflectionProbeTexture
#endif
, texture3d<ushort> u_clusterTexture
#ifdef C3D_USE_TEXTURE_FOR_LIGHT_INDICES
, texture1d<ushort> u_lightIndicesTexture
#else
, constant C3DLightIndexType* u_lightIndicesBuffer
#endif
#endif
#if USE_ARGUMENT_BUFFERS
#define u_emissionTexture scn_commonprofile.emissionTexture
#define u_emissionTextureSampler scn_commonprofile.emissionSampler
#define u_ambientTexture scn_commonprofile.ambientTexture
#define u_ambientTextureSampler scn_commonprofile.ambientSampler
#define u_diffuseTexture scn_commonprofile.diffuseTexture
#define u_diffuseTextureSampler scn_commonprofile.diffuseSampler
#define u_specularTexture scn_commonprofile.specularTexture
#define u_specularTextureSampler scn_commonprofile.specularSampler
#define u_reflectiveTexture scn_commonprofile.reflectiveTexture
#define u_reflectiveTextureSampler scn_commonprofile.reflectiveSampler
#define u_transparentTexture scn_commonprofile.transparentTexture
#define u_transparentTextureSampler scn_commonprofile.transparentSampler
#define u_multiplyTexture scn_commonprofile.multiplyTexture
#define u_multiplyTextureSampler scn_commonprofile.multiplySampler
#define u_normalTexture scn_commonprofile.normalTexture
#define u_normalTextureSampler scn_commonprofile.normalSampler
#define u_selfIlluminationTexture scn_commonprofile.selfIlluminationTexture
#define u_selfIlluminationTextureSampler scn_commonprofile.selfIlluminationSampler
#define u_metalnessTexture scn_commonprofile.metalnessTexture
#define u_metalnessTextureSampler scn_commonprofile.metalnessSampler
#define u_roughnessTexture scn_commonprofile.roughnessTexture
#define u_roughnessTextureSampler scn_commonprofile.roughnessSampler
#else
#ifdef USE_EMISSION_MAP
, texture2d<float> u_emissionTexture
, sampler u_emissionTextureSampler
#endif
#ifdef USE_AMBIENT_MAP
, texture2d<float> u_ambientTexture
, sampler u_ambientTextureSampler
#endif
#ifdef USE_DIFFUSE_MAP
, texture2d<float> u_diffuseTexture
, sampler u_diffuseTextureSampler
#endif
#ifdef USE_SPECULAR_MAP
, texture2d<float> u_specularTexture
, sampler u_specularTextureSampler
#endif
#ifdef USE_REFLECTIVE_MAP
, texture2d<float> u_reflectiveTexture
, sampler u_reflectiveTextureSampler
#elif defined(USE_REFLECTIVE_CUBEMAP)
, texturecube<float> u_reflectiveTexture
, sampler u_reflectiveTextureSampler
#endif
#ifdef USE_TRANSPARENT_MAP
, texture2d<float> u_transparentTexture
, sampler u_transparentTextureSampler
#endif
#ifdef USE_MULTIPLY_MAP
, texture2d<float> u_multiplyTexture
, sampler u_multiplyTextureSampler
#endif
#ifdef USE_NORMAL_MAP
, texture2d<float> u_normalTexture
, sampler u_normalTextureSampler
#endif
#ifdef USE_SELFILLUMINATION_MAP
, texture2d<float> u_selfIlluminationTexture
, sampler u_selfIlluminationTextureSampler
#endif
#ifdef USE_DISPLACEMENT_MAP
, texture2d<float> u_displacementTexture
, sampler u_displacementTextureSampler
#endif
#ifdef USE_PBR
#ifdef USE_METALNESS_MAP
, texture2d<float> u_metalnessTexture
, sampler u_metalnessTextureSampler
#endif
#ifdef USE_ROUGHNESS_MAP
, texture2d<float> u_roughnessTexture
, sampler u_roughnessTextureSampler
#endif
#ifdef USE_CLEARCOAT_MAP
, texture2d<float> u_clearCoatTexture
, sampler u_clearCoatTextureSampler
#endif
#ifdef USE_CLEARCOATROUGHNESS_MAP
, texture2d<float> u_clearCoatRoughnessTexture
, sampler u_clearCoatRoughnessTextureSampler
#endif
#ifdef USE_CLEARCOATNORMAL_MAP
, texture2d<float> u_clearCoatNormalTexture
, sampler u_clearCoatNormalTextureSampler
#endif
#endif // USE_PBR
#endif // USE_ARGUMENT_BUFFERS
#ifdef USE_PBR
, texturecube<float> u_radianceTexture
, texture2d<float> u_specularDFGTexture
#if !defined(USE_SELFILLUMINATION_MAP)
, texturecube<float> u_irradianceTexture
#endif
#endif // USE_PBR
#ifdef USE_SSAO
, texture2d<float> u_ssaoTexture
#endif
#ifdef USE_FRAGMENT_EXTRA_ARGUMENTS
#endif
#if defined(USE_DOUBLE_SIDED)
, bool isFrontFacing [[front_facing]]
#endif
#ifdef USE_POINT_RENDERING
, float2 pointCoord [[point_coord]]
#endif
)
{
#ifdef USE_MULTIPLE_RENDERING
device SCNSceneBuffer& scn_frame = scn_frames[0];
device SCNSceneBuffer& scn_frame_slice = scn_frames[in.sliceIndex];
#endif
SCNOutput _output;
//
// MARK: Populating the `_surface` struct
//
SCNShaderSurface _surface;
#ifdef USE_TEXCOORD
_surface.diffuseTexcoord = in.texcoord0;
#endif
_surface.ambientOcclusion = 1.f; // default to no AO
#ifdef USE_AMBIENT_MAP
#ifdef USE_AMBIENT_AS_AMBIENTOCCLUSION
_surface.ambientOcclusion = u_ambientTexture.sample(u_ambientTextureSampler, _surface.ambientTexcoord).r;
#ifdef USE_AMBIENT_INTENSITY
_surface.ambientOcclusion = saturate(mix(1.f, _surface.ambientOcclusion, scn_commonprofile.ambientIntensity));
#endif
#else // AMBIENT_MAP
_surface.ambient = u_ambientTexture.sample(u_ambientTextureSampler, _surface.ambientTexcoord);
#ifdef USE_AMBIENT_INTENSITY
_surface.ambient *= scn_commonprofile.ambientIntensity;
#endif
#endif // USE_AMBIENT_AS_AMBIENTOCCLUSION
#if defined(USE_AMBIENT_TEXTURE_COMPONENT)
_surface.ambient = colorFromMask(_surface.ambient, USE_AMBIENT_TEXTURE_COMPONENT).r;
#endif
#elif defined(USE_AMBIENT_COLOR)
_surface.ambient = scn_commonprofile.ambientColor;
#elif defined(USE_AMBIENT)
_surface.ambient = float4(0.);
#endif
#if defined(USE_AMBIENT) && defined(USE_VERTEX_COLOR)
_surface.ambient *= in.vertexColor;
#endif
#if defined(USE_SSAO)
_surface.ambientOcclusion *= u_ssaoTexture.sample( sampler(filter::linear), in.fragmentPosition.xy * scn_frame.inverseResolution.xy ).x;
#endif
#ifdef USE_DIFFUSE_MAP
_surface.diffuse = u_diffuseTexture.sample(u_diffuseTextureSampler, _surface.diffuseTexcoord);
#if defined(USE_DIFFUSE_TEXTURE_COMPONENT)
_surface.diffuse = colorFromMask(_surface.diffuse, USE_DIFFUSE_TEXTURE_COMPONENT);
#endif
#ifdef USE_DIFFUSE_INTENSITY
_surface.diffuse.rgb *= scn_commonprofile.diffuseIntensity;
#endif
#elif defined(USE_DIFFUSE_COLOR)
_surface.diffuse = scn_commonprofile.diffuseColor;
#else
_surface.diffuse = float4(0.f,0.f,0.f,1.f);
#endif
#if defined(USE_DIFFUSE) && defined(USE_VERTEX_COLOR)
_surface.diffuse.rgb *= in.vertexColor.rgb;
_surface.diffuse *= in.vertexColor.a; // vertex color are not premultiplied to allow interpolation
#endif
#ifdef USE_SPECULAR_MAP
_surface.specular = u_specularTexture.sample(u_specularTextureSampler, _surface.specularTexcoord);
#if defined(USE_SPECULAR_TEXTURE_COMPONENT)
_surface.specular = colorFromMask(_surface.specular, USE_SPECULAR_TEXTURE_COMPONENT);
#endif
#ifdef USE_SPECULAR_INTENSITY
_surface.specular *= scn_commonprofile.specularIntensity;
#endif
#elif defined(USE_SPECULAR_COLOR)
_surface.specular = scn_commonprofile.specularColor;
#elif defined(USE_SPECULAR)
_surface.specular = float4(0.f);
#endif
#ifdef USE_CLEARCOAT_MAP
_surface.clearCoat = u_clearCoatTexture.sample(u_clearCoatTextureSampler, _surface.clearCoatTexcoord).r;
#if defined(USE_CLEARCOAT_TEXTURE_COMPONENT)
_surface.clearCoat = colorFromMask(_surface.clearCoat, USE_CLEARCOAT_TEXTURE_COMPONENT).r;
#endif
#ifdef USE_CLEARCOAT_INTENSITY
_surface.clearCoat *= scn_commonprofile.clearCoatIntensity;
#endif
#elif defined(USE_CLEARCOAT_COLOR)
_surface.clearCoat = scn_commonprofile.clearCoat;
#elif defined(USE_CLEARCOAT)
_surface.clearCoat = 0.f;
#endif
#ifdef USE_CLEARCOATROUGHNESS_MAP
#if defined(USE_CLEARCOATROUGHNESS_TEXTURE_COMPONENT)
_surface.clearCoatRoughness = colorFromMask(u_clearCoatRoughnessTexture.sample(u_clearCoatRoughnessTextureSampler, _surface.clearCoatRoughnessTexcoord), USE_CLEARCOATROUGHNESS_TEXTURE_COMPONENT).r;
#else
_surface.clearCoatRoughness = u_clearCoatRoughnessTexture.sample(u_clearCoatRoughnessTextureSampler, _surface.clearCoatRoughnessTexcoord).r;
#endif
#ifdef USE_CLEARCOATROUGHNESS_INTENSITY
_surface.clearCoatRoughness *= scn_commonprofile.clearCoatRoughnessIntensity;
#endif
#elif defined(USE_CLEARCOATROUGHNESS_COLOR)
_surface.clearCoatRoughness = scn_commonprofile.clearCoatRoughness;
#else
_surface.clearCoatRoughness = 0.03f;
#endif
#ifdef USE_EMISSION_MAP
_surface.emission = u_emissionTexture.sample(u_emissionTextureSampler, _surface.emissionTexcoord);
#if defined(USE_EMISSION_TEXTURE_COMPONENT)
_surface.emission = colorFromMask(_surface.emission, USE_EMISSION_TEXTURE_COMPONENT);
#endif
#ifdef USE_EMISSION_INTENSITY
_surface.emission *= scn_commonprofile.emissionIntensity;
#endif
#elif defined(USE_EMISSION_COLOR)
_surface.emission = scn_commonprofile.emissionColor;
#elif defined(USE_EMISSION)
_surface.emission = float4(0.);
#endif
#ifdef USE_SELFILLUMINATION_MAP
_surface.selfIllumination = u_selfIlluminationTexture.sample(u_selfIlluminationTextureSampler, _surface.selfIlluminationTexcoord);
#if defined(USE_SELFILLUMINATION_TEXTURE_COMPONENT)
_surface.selfIllumination = colorFromMask(_surface.selfIllumination, USE_SELFILLUMINATION_TEXTURE_COMPONENT);
#endif
#ifdef USE_SELFILLUMINATION_INTENSITY
_surface.selfIllumination *= scn_commonprofile.selfIlluminationIntensity;
#endif
#elif defined(USE_SELFILLUMINATION_COLOR)
_surface.selfIllumination = scn_commonprofile.selfIlluminationColor;
#elif defined(USE_SELFILLUMINATION)
_surface.selfIllumination = float4(0.);
#endif
#ifdef USE_MULTIPLY_MAP
_surface.multiply = u_multiplyTexture.sample(u_multiplyTextureSampler, _surface.multiplyTexcoord);
#if defined(USE_MULTIPLY_TEXTURE_COMPONENT)
_surface.multiply = colorFromMask(_surface.multiply, USE_MULTIPLY_TEXTURE_COMPONENT);
#endif
#ifdef USE_MULTIPLY_INTENSITY
_surface.multiply = mix(float4(1.), _surface.multiply, scn_commonprofile.multiplyIntensity);
#endif
#elif defined(USE_MULTIPLY_COLOR)
_surface.multiply = scn_commonprofile.multiplyColor;
#elif defined(USE_MULTIPLY)
_surface.multiply = float4(1.);
#endif
#ifdef USE_TRANSPARENT_MAP
_surface.transparent = u_transparentTexture.sample(u_transparentTextureSampler, _surface.transparentTexcoord);
#if defined(USE_TRANSPARENT_TEXTURE_COMPONENT)
_surface.transparent = colorFromMask(_surface.transparent, USE_TRANSPARENT_TEXTURE_COMPONENT);
#endif
#ifdef USE_TRANSPARENT_INTENSITY
_surface.transparent *= scn_commonprofile.transparentIntensity;
#endif
#elif defined(USE_TRANSPARENT_COLOR)
_surface.transparent = scn_commonprofile.transparentColor;
#elif defined(USE_TRANSPARENT)
_surface.transparent = float4(1.f);
#endif
#ifdef USE_METALNESS_MAP
#if defined(USE_METALNESS_TEXTURE_COMPONENT)
_surface.metalness = colorFromMask(u_metalnessTexture.sample(u_metalnessTextureSampler, _surface.metalnessTexcoord), USE_METALNESS_TEXTURE_COMPONENT).r;
#else
_surface.metalness = u_metalnessTexture.sample(u_metalnessTextureSampler, _surface.metalnessTexcoord).r;
#endif
#ifdef USE_METALNESS_INTENSITY
_surface.metalness *= scn_commonprofile.metalnessIntensity;
#endif
#elif defined(USE_METALNESS_COLOR)
_surface.metalness = scn_commonprofile.metalness;
#else
_surface.metalness = 0.f;
#endif
#ifdef USE_ROUGHNESS_MAP
#if defined(USE_ROUGHNESS_TEXTURE_COMPONENT)
_surface.roughness = colorFromMask(u_roughnessTexture.sample(u_roughnessTextureSampler, _surface.roughnessTexcoord), USE_ROUGHNESS_TEXTURE_COMPONENT).r;
#else
_surface.roughness = u_roughnessTexture.sample(u_roughnessTextureSampler, _surface.roughnessTexcoord).r;
#endif
#ifdef USE_ROUGHNESS_INTENSITY
_surface.roughness *= scn_commonprofile.roughnessIntensity;
#endif
#elif defined(USE_ROUGHNESS_COLOR)
_surface.roughness = scn_commonprofile.roughness;
#else
_surface.roughness = 0.f;
#endif
#if (defined USE_POSITION) && (USE_POSITION == 2)
_surface.position = in.position;
#endif
#if (defined USE_NORMAL) && (USE_NORMAL == 2)
#if defined(HAS_NORMAL) || defined(USE_OPENSUBDIV)
#ifdef USE_DOUBLE_SIDED
_surface.geometryNormal = normalize(in.normal.xyz) * (isFrontFacing ? 1.f : -1.f );
#else
_surface.geometryNormal = normalize(in.normal.xyz);
#endif
#else // need to generate the normal from the derivatives
_surface.geometryNormal = normalize( cross(dfdy( _surface.position ), dfdx( _surface.position ) ));
#endif
_surface.normal = _surface.geometryNormal;
_surface.clearCoatNormal = _surface.geometryNormal;
#endif
#if defined(USE_TANGENT) && (USE_TANGENT == 2)
_surface.tangent = in.tangent;
#endif
#if defined(USE_BITANGENT) && (USE_BITANGENT == 2)
_surface.bitangent = in.bitangent;
#endif
#if (defined USE_VIEW) && (USE_VIEW == 2)
_surface.view = normalize(-in.position);
#endif
#if defined(USE_NORMAL_MAP)
{
float3x3 ts2vs = float3x3(_surface.tangent, _surface.bitangent, _surface.normal);
#ifdef USE_NORMAL_MAP
#if defined(USE_NORMAL_TEXTURE_COMPONENT)
_surface._normalTS.xy = colorFromMask(u_normalTexture.sample(u_normalTextureSampler, _surface.normalTexcoord), USE_NORMAL_TEXTURE_COMPONENT).rg * 2.f - 1.f;
_surface._normalTS.z = sqrt(1.f - saturate(length_squared(_surface._normalTS.xy)));
#else
_surface._normalTS = u_normalTexture.sample(u_normalTextureSampler, _surface.normalTexcoord).rgb;
_surface._normalTS = _surface._normalTS * 2.f - 1.f;
#endif
#ifdef USE_NORMAL_INTENSITY
_surface._normalTS = mix(float3(0.f, 0.f, 1.f), _surface._normalTS, scn_commonprofile.normalIntensity);
#endif
#else
_surface._normalTS = float3(0.f, 0.f, 1.f);
#endif
_surface.normal.rgb = normalize(ts2vs * _surface._normalTS.xyz );
}
#else
_surface._normalTS = float3(0.f, 0.f, 1.f);
#endif
#if defined(USE_CLEARCOATNORMAL_MAP)
{
//when there is no normal map, there seems to be no tangent and it breaks the clearCoatNormal...
float3x3 ts2vs = float3x3(_surface.tangent, _surface.bitangent, _surface.geometryNormal);
#ifdef USE_CLEARCOATNORMAL_MAP
#if defined(USE_CLEARCOATNORMAL_TEXTURE_COMPONENT)
_surface._clearCoatNormalTS.xy = colorFromMask(u_clearCoatNormalTexture.sample(u_clearCoatnormalTextureSampler, _surface.clearCoatNormalTexcoord), USE_CLEARCOATNORMAL_TEXTURE_COMPONENT).rg * 2.f - 1.f;
_surface._clearCoatNormalTS.z = sqrt(1.f - saturate(length_squared(_surface._clearCoatNormalTS.xy)));
#else
_surface._clearCoatNormalTS = u_clearCoatNormalTexture.sample(u_clearCoatNormalTextureSampler, _surface.clearCoatNormalTexcoord).rgb;
_surface._clearCoatNormalTS = _surface._clearCoatNormalTS * 2.f - 1.f;
#endif
#ifdef USE_CLEARCOATNORMAL_INTENSITY
_surface._clearCoatNormalTS = mix(float3(0.f, 0.f, 1.f), _surface._clearCoatNormalTS, scn_commonprofile.clearCoatNormalIntensity);
#endif
#else
_surface._clearCoatNormalTS = float3(0.f, 0.f, 1.f);
#endif
_surface.clearCoatNormal.rgb = normalize(ts2vs * _surface._clearCoatNormalTS.xyz );
}
#else
_surface._clearCoatNormalTS = float3(0.f, 0.f, 1.f);
#endif
#ifdef USE_REFLECTIVE_MAP
float3 refl = reflect( -_surface.view, _surface.normal );
float m = 2.f * sqrt( refl.x*refl.x + refl.y*refl.y + (refl.z+1.f)*(refl.z+1.f));
_surface.reflective = u_reflectiveTexture.sample(u_reflectiveTextureSampler, float2(float2(refl.x,-refl.y) / m) + 0.5f);
#if defined(USE_REFLECTIVE_TEXTURE_COMPONENT)
_surface.reflective = colorFromMask(_surface.reflective, USE_REFLECTIVE_TEXTURE_COMPONENT).r;
#endif
#ifdef USE_REFLECTIVE_INTENSITY
_surface.reflective *= scn_commonprofile.reflectiveIntensity;
#endif
#elif defined(USE_REFLECTIVE_CUBEMAP)
float3 refl = reflect( _surface.position, _surface.normal );
_surface.reflective = u_reflectiveTexture.sample(u_reflectiveTextureSampler, scn::mat4_mult_float3(scn_frame.viewToCubeTransform, refl)); // sample the cube map in world space
#ifdef USE_REFLECTIVE_INTENSITY
_surface.reflective *= scn_commonprofile.reflectiveIntensity;
#endif
#elif defined(USE_REFLECTIVE_COLOR)
_surface.reflective = scn_commonprofile.reflectiveColor;
#elif defined(USE_REFLECTIVE)
_surface.reflective = float4(0.);
#endif
#ifdef USE_FRESNEL
_surface.fresnel = scn_commonprofile.fresnel.x + scn_commonprofile.fresnel.y * pow(1.f - saturate(dot(_surface.view, _surface.normal)), scn_commonprofile.fresnel.z);
_surface.reflective *= _surface.fresnel;
#endif
#ifdef USE_SHININESS
_surface.shininess = scn_commonprofile.materialShininess;
#endif
//
// MARK: Surface shader modifier
//
#ifdef USE_SURFACE_MODIFIER
// DoSurfaceModifier START
// DoSurfaceModifier END
#endif
//
// MARK: Lighting
//
SCNShaderLightingContribution _lightingContribution(_surface, in);
#ifdef USE_LIGHT_MODIFIER
#endif
#ifdef USE_AMBIENT_LIGHTING
_lightingContribution.ambient = scn_frame.ambientLightingColor.rgb;
#endif
#ifdef USE_LIGHTING
#ifdef USE_PER_PIXEL_LIGHTING
#ifdef USE_CLUSTERED_LIGHTING
uint3 clusterIndex;
clusterIndex.xy = uint2(in.fragmentPosition.xy * scn_frame.clusterScale.xy); // TODO Multiple rendering
clusterIndex.z = in.position.z * scn_frame.clusterScale.z + scn_frame.clusterScale.w; // scale/bias
// x:offset y:spot<<8|omni z:area?|probe w:????
ushort4 cluster_offset_count = u_clusterTexture.read(clusterIndex);
int lid = cluster_offset_count.x;
#endif
#ifdef USE_PBR
_lightingContribution.prepareForPBR(u_specularDFGTexture, scn_commonprofile.selfIlluminationOcclusion);
#ifdef USE_CLEARCOAT
_lightingContribution.prepareForPBRClearCoat(u_specularDFGTexture);
#endif
// Irradiance
#ifdef USE_SELFILLUMINATION
_lightingContribution.add_irradiance_from_selfIllum();
#else
#ifdef USE_PROBES_LIGHTING // Irradiance SH
_lightingContribution.add_global_irradiance_from_sh(scn_frame.viewToCubeTransform, scn_node.shCoefficients);
#else
_lightingContribution.add_global_irradiance_probe(u_irradianceTexture, scn_frame.viewToCubeTransform, scn_frame.environmentIntensity);
#endif
#endif
// Radiance
#ifndef DISABLE_SPECULAR
#ifdef C3D_USE_REFLECTION_PROBES
int probe_count = (cluster_offset_count.z & 0xff);
for (int i = 0 ; i < probe_count; ++i, ++lid) {
_lightingContribution.add_local_probe(scn_lights[LightIndex(lid)], u_reflectionProbeTexture);
}
#if PROBES_NORMALIZATION
#if PROBES_OUTER_BLENDING
_lightingContribution.specular += _lightingContribution.probesWeightedSum.rgb / max(1.f, _lightingContribution.probesWeightedSum.a);
#else
_lightingContribution.specular += _lightingContribution.probesWeightedSum.rgb / _lightingContribution.probesWeightedSum.a;
#endif
float globalFactor = saturate(1.f - _lightingContribution.probesWeightedSum.a);
#else
float globalFactor = _lightingContribution.probeRadianceRemainingFactor;
#endif
_lightingContribution.add_global_probe(scn_frame.viewToCubeTransform, globalFactor * scn_frame.environmentIntensity,
u_reflectionProbeTexture);
#else // Global Probe
_lightingContribution.add_global_probe(u_radianceTexture, scn_frame.viewToCubeTransform, scn_frame.environmentIntensity);
#ifdef USE_CLEARCOAT
_lightingContribution.add_global_probeClearCoat(u_radianceTexture, scn_frame.viewToCubeTransform, scn_frame.environmentIntensity);
#endif
#endif // C3D_USE_REFLECTION_PROBES
#endif // DISABLE_SPECULAR
#endif // USE_PBR
#if DEBUG_PIXEL
switch (DEBUG_PIXEL) {
case 1: _output.color = float4(_surface.normal * 0.5f + 0.5f, 1.f); break;
case 2: _output.color = float4(_surface.geometryNormal * 0.5f + 0.5f, 1.f); break;
case 3: _output.color = float4(_surface.tangent * 0.5f + 0.5f, 1.f); break;
case 4: _output.color = float4(in.uv0, 0.f, 1.f); break;
case 5: _output.color = float4(_surface.diffuse.rgb, 1.f); break;
case 6: _output.color = float4(float3(_surface.roughness), 1.f); break;
case 7: _output.color = float4(float3(_surface.metalness), 1.f); break;
case 8: _output.color = float4(float3(_surface.ambientOcclusion), 1.f); break;
default: break;
}
return _output;
#endif
_lightingContribution.add_directional(scn_lights[0]);
#ifdef USE_CLUSTERED_LIGHTING
// Omni lights
int omni_count = cluster_offset_count.y & 0xff;
for (int i = 0 ; i < omni_count; ++i, ++lid) {
_lightingContribution.add_local_omni(scn_lights[LightIndex(lid)]);
}
// Spot lights
int spot_count = (cluster_offset_count.y >> 8);
for (int i = 0 ; i < spot_count; ++i, ++lid) {
_lightingContribution.add_local_spot(scn_lights[LightIndex(lid)]);
}
#endif
#else // USE_PER_PIXEL_LIGHTING
_lightingContribution.diffuse = in.diffuse;
#ifdef USE_SPECULAR
_lightingContribution.specular = in.specular;
#endif
#endif // USE_PER_PIXEL_LIGHTING
#ifdef AVOID_OVERLIGHTING
_lightingContribution.diffuse = saturate(_lightingContribution.diffuse);
#ifdef USE_SPECULAR
_lightingContribution.specular = saturate(_lightingContribution.specular);
#endif // USE_SPECULAR
#endif // AVOID_OVERLIGHTING
#else // USE_LIGHTING
_lightingContribution.diffuse = float3(1.);
#endif // USE_LIGHTING
//
// MARK: Populating the `_output` struct
//
#ifdef USE_PBR
{ // combine IBL + lighting
float3 albedo = _surface.diffuse.rgb;
float3 diffuseAlbedo = mix(albedo, float3(0.0), _surface.metalness);
// ambient
float3 color = (_lightingContribution.ambient * _surface.ambientOcclusion) * albedo;
color += _lightingContribution.diffuse * diffuseAlbedo;
#ifndef DISABLE_SPECULAR
color += _lightingContribution.specular;
#endif
#ifdef USE_EMISSION
color += _surface.emission.rgb;
#endif
#ifdef USE_MULTIPLY
color *= _surface.multiply.rgb;
#endif
#ifdef USE_MODULATE
color *= _lightingContribution.modulate;
#endif
_output.color.rgb = color;
}
#else // USE_PBR
#ifdef USE_SHADOWONLY
_output.color.rgb = float3(0.0);
_output.color.a = 1. - _lightingContribution.shadowFactor;
#else
_output.color.rgb = illuminate(_surface, _lightingContribution);
#endif
#endif
#ifndef USE_SHADOWONLY
_output.color.a = _surface.diffuse.a;
#endif
#ifdef USE_FOG
float fogFactor = pow(clamp(length(_surface.position.xyz) * scn_frame.fogParameters.x + scn_frame.fogParameters.y, 0., scn_frame.fogColor.a), scn_frame.fogParameters.z);
_output.color.rgb = mix(_output.color.rgb, scn_frame.fogColor.rgb * _output.color.a, fogFactor);
#endif
#ifndef DIFFUSE_PREMULTIPLIED
_output.color.rgb *= _surface.diffuse.a;
#endif
//
// MARK: Opacity and transparency
//
#ifdef USE_SHADOWONLY
float transparencyFactor = 1.0;
#ifdef USE_NODE_OPACITY
transparencyFactor *= in.nodeOpacity;
#endif
_output.color.a *= transparencyFactor; // for AR compositing: alpha should be at 0 where there's no shadow
#else
#ifdef USE_TRANSPARENT // Either a map or a color
#ifdef USE_TRANSPARENCY
_surface.transparent *= scn_commonprofile.transparency;
#endif
#ifdef USE_TRANSPARENCY_RGBZERO
#ifdef USE_NODE_OPACITY
_output.color *= in.nodeOpacity;
#endif
// compute luminance
_surface.transparent.a = (_surface.transparent.r * 0.212671f) + (_surface.transparent.g * 0.715160f) + (_surface.transparent.b * 0.072169f);
_output.color *= (float4(1.f) - _surface.transparent);
#else // ALPHA_ONE
#ifdef USE_NODE_OPACITY
_output.color *= (in.nodeOpacity * _surface.transparent.a);
#else
_output.color *= _surface.transparent.a;
#endif
#endif
#else
#ifdef USE_TRANSPARENCY // TRANSPARENCY without TRANSPARENT slot (nodeOpacity + diffuse.a)
#ifdef USE_NODE_OPACITY
_output.color *= (in.nodeOpacity * scn_commonprofile.transparency);
#else
_output.color *= scn_commonprofile.transparency;
#endif // NODE_OPACITY
#endif
#endif
#endif // USE_SHADOWONLY
//
// MARK: Fragment shader modifier
//
#ifdef USE_FRAGMENT_MODIFIER
// DoFragmentModifier START
// DoFragmentModifier END
#endif
#if defined(USE_CLUSTERED_LIGHTING) && defined(DEBUG_CLUSTER_TILE)
_output.color.rgb = mix(_output.color.rgb, float3(scn::debugColorForCount(clusterIndex.z).xyz), 0.1f);
_output.color.rgb = mix(_output.color.rgb, float3(clusterIndex.x & 0x1 ^ clusterIndex.y & 0x1).xyz, 0.01f);
#endif
#ifdef DISABLE_LINEAR_RENDERING
_output.color.rgb = scn::linear_to_srgb(_output.color.rgb);
#endif
#ifdef USE_DISCARD
if (_output.color.a == 0.) // we could set a different limit here
discard_fragment();
#endif
#ifdef USE_POINT_RENDERING
if ((dfdx(pointCoord.x) < 0.5f) && (length_squared(pointCoord * 2.f - 1.f) > 1.f)) {
discard_fragment();
}
#endif
#ifdef USE_OUTLINE
_output.color.rgb = in.outlineHash;
#endif
// MRT
#ifdef USE_MOTIONBLUR
#ifdef USE_MULTIPLE_RENDERING
_output.motionblur.xy = (half2(((in.fragmentPosition.xy-scn_frame_slice.viewportSize.zw)/scn_frame_slice.viewportSize.xy)*2.f-1.f) - half2((in.velocity.xy) / in.velocity.z)) * scn_frame_slice.motionBlurIntensity;
#else
_output.motionblur.xy = half2((in.mv_fragment.xy / in.mv_fragment.z) - (in.mv_lastFragment.xy / in.mv_lastFragment.z))*half2(1.,-1.) * scn_frame.motionBlurIntensity;
#endif
_output.motionblur.z = length(_output.motionblur.xy);
_output.motionblur.w = half(-_surface.position.z);
#endif
#ifdef USE_NORMALS_OUTPUT
_output.normals = half4( half3(_surface.normal.xyz), half(_surface.roughness) );
#endif
#ifdef USE_RADIANCE_OUTPUT
_output.radiance.rgb = half3(_lightingContribution.specular.rgb);
#endif
#ifdef USE_REFLECTANCE_ROUGHNESS_OUTPUT
#ifdef USE_PBR
_output.reflectanceRoughnessOutput = half4( half3(_lightingContribution.probeReflectance), half(_surface.roughness) );
#else // SSR on non pbr material is not supported
_output.reflectanceRoughnessOutput = half4( 0.h );
#endif
#endif
_output.color = min(_output.color, float4(160.));
return _output;
}
@drewolbrich
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Thank you for posting this. I have now achieved enlightenment with respect to SceneKit frame dropping issues.

@drewolbrich
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This is perhaps the most important web page on the Internet.

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