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#ifdef USE_HWSKINNING
#ifndef NUM_BONES
#error A required pre-processor define "NUM_BONES" is not set!
#endif
attribute vec4 inBoneWeight;
attribute vec4 inBoneIndices;
uniform mat4 m_BoneMatrices[NUM_BONES];
void Skinning_Compute(inout vec4 position, inout vec4 normal){
vec4 index = inBoneIndices;
vec4 weight = inBoneWeight;
vec4 newPos = vec4(0.0);
vec4 newNormal = vec4(0.0);
for (float i = 0.0; i < 4.0; i += 1.0){
mat4 skinMat = m_BoneMatrices[int(index.x)];
newPos += weight.x * (skinMat * position);
newNormal += weight.x * (skinMat * normal);
index = index.yzwx;
weight = weight.yzwx;
}
position = newPos;
normal = newNormal;
}
#else
void Skinning_Compute(inout vec4 position, inout vec4 normal){
// skinning disabled, leave position and normal unaltered
}
#endif
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