Stephen Hill selfshadow

selfshadow / Input

Created June 18, 2014 19:27

HLSL bug with const parameters and loops (tested with fxc from 7.0, 8.0, 8.1 Windows SDK)

	struct PS_INPUT
	{
	float4 Pos : VS_OUT_POSITION;
	};

	// removing "const" fixes the problem
	float4 Function(const float4 value)
	{
	return value;
	}

selfshadow / gist:8048308

Last active March 19, 2023 06:44

Reoriented Normal Mapping (http://blog.selfshadow.com/publications/blending-in-detail/) for unpacked, normalised vectors

	// Blending when n1 and n2 are already 'unpacked' and normalised
	float3 blend_rnm_unpacked(float3 n1, float3 n2)
	{
	float3 t = n1.xyz + float3( 0, 0, 1);
	float3 u = n2.xyz * float3(-1, -1, 1);
	float3 r = (t/t.z)*dot(t, u) - u;
	return r;
	}

selfshadow / gist:5794173

Last active December 18, 2015 13:59

Quick Beckmann HLSL test

	float Beckmann1(float3 n, float3 h, float m)
	{
	float ndoth = saturate(dot(n, h));
	float cos2 = ndoth*ndoth;
	return exp((cos2 - 1)/(cos2mm));
	}

	// mul r0.x, cb0[2].x, cb0[2].x
	// dp3_sat r0.y, cb0[0].xyzx, cb0[1].xyzx
	// mul r0.z, r0.y, r0.y