source: code/branches/tutorial/Tutorial/Media/materials/programs/crowdVp.glsl @ 31

uniform mat4 viewProjectionMatrix;
uniform float numBones;
uniform vec4 worldMatrix3x4Array[240];
uniform vec4 lightDiffuseColour;
uniform vec4 ambient;
uniform vec4 lightPos;

attribute vec4 blendIndices;
attribute vec4 blendWeights;


void main()
{
        vec3 blendPos = vec3(0,0,0);
        vec3 blendNorm = vec3(0,0,0);
        
        vec3 tmpPos = vec3(0,0,0);
        vec3 tmpNorm = vec3(0,0,0);


        int instanceOffset = int(gl_MultiTexCoord1.x) * 3 * int(numBones);
        for (int bone = 0; bone < 2; ++bone)
        {
                // perform matrix multiplication manually since no 3x4 matrices
                for (int row = 0; row < 3; ++row)
                {
                    int idx = instanceOffset + int(blendIndices[bone]) * 3 + row;
                        vec4 blendMatrixRow = worldMatrix3x4Array[idx];
                        tmpPos[row] = dot(blendMatrixRow, gl_Vertex);
#if SHADOW_CASTER
#else
                        tmpNorm[row] = dot(blendMatrixRow.xyz, gl_Normal);
#endif
                        
                }
                // now weight this into final 
                blendPos += tmpPos * blendWeights[bone];
#if SHADOW_CASTER
#else
                blendNorm += tmpNorm * blendWeights[bone];
#endif
        }

        // apply view / projection to position
        gl_Position = viewProjectionMatrix * vec4(blendPos, 1);

        
#if SHADOW_CASTER
        gl_FrontColor = ambient;
#else
        // simple lighting model
        vec3 lightDir = normalize(
                lightPos.xyz -  (blendPos.xyz * lightPos.w));
        gl_FrontColor = ambient 
                + clamp(dot(lightDir, blendNorm), 0.0, 1.0) * lightDiffuseColour;
#endif
    gl_FrontSecondaryColor = vec4(0);
        gl_TexCoord[0] = gl_MultiTexCoord0;

        
}