sh.vert

vertex shader.

//code start

 
//Spherical harmonic shader opengl es

//Sh.vsh
 

attribute vec4 Position;
attribute vec3 Normal;
attribute vec3 DiffuseMaterial;

varying vec3 EyespaceNormal;
varying vec3 EyespaceLight;
varying vec4 VertexPosition;
varying vec3 Diffuse;
varying vec3 Irrad;

uniform vec3 LightPosition;
uniform mat4 Projection;
uniform mat4 Modelview;
uniform mat3 NormalMatrix;

const vec3 L_00 = vec3( 0.79, 0.44, 0.54);
const vec3 L_1_1 = vec3( 0.39, 0.35, 0.60);
const vec3 L_10 = vec3(-0.34, -0.18, -0.27);
const vec3 L_11 = vec3(-0.29, -0.06, 0.01);
const vec3 L_2_2 = vec3(-0.11, -0.05, -0.12);
const vec3 L_2_1 = vec3(-0.26, -0.22, -0.45);
const vec3 L_20 = vec3(-0.16, -0.09, -0.15);
const vec3 L_21 = vec3( 0.56, 0.21, 0.14);
const vec3 L_22 = vec3( 0.21, -0.05, -0.30);

vec3 irradcoeffs(vec3 L00, vec3 L1_1, vec3 L10, vec3 L11, vec3 L2_2, vec3 L2_1, vec3 L20, vec3 L21, vec3 L22, vec3 n)
{
float x2, y2, z2;
float xy, yz, xz;
float x, y, z;

const float c1 = 0.429043;
const float c2 = 0.511664;
const float c3 = 0.743125;
const float c4 = 0.886227;
const float c5 = 0.247708;
x = n.x; y = n.y; z = n.z;

x2 = x*x ; y2 = y*y ; z2 = z*z ;
xy = x*y ; yz = y*z ; xz = x*z ;

return c1*L22*(x2-y2) + c3*L20*z2 + c4*L00 - c5*L20
+ 2.0*c1*(L2_2*xy + L21*xz + L2_1*yz)
+ 2.0*c2*(L11*x+L1_1*y+L10*z);
}

void main(void)
{
EyespaceNormal = NormalMatrix * Normal;
Irrad = irradcoeffs(L_00, L_1_1, L_10, L_11, L_2_2, L_2_1, L_20, L_21, L_22, normalize(Normal));
Diffuse = DiffuseMaterial;
gl_Position = Projection * Modelview * Position;
EyespaceLight = normalize(LightPosition - vec3(gl_Position));
}

//code end