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#version 100
#define MAX_BONE_NUM 64
// Input vertex attributes
attribute vec3 vertexPosition;
attribute vec2 vertexTexCoord;
attribute vec4 vertexColor;
attribute vec4 vertexBoneIds;
attribute vec4 vertexBoneWeights;
// Input uniform values
uniform mat4 mvp;
uniform mat4 boneMatrices[MAX_BONE_NUM];
// Output vertex attributes (to fragment shader)
varying vec2 fragTexCoord;
varying vec4 fragColor;
void main()
{
int boneIndex0 = int(vertexBoneIds.x);
int boneIndex1 = int(vertexBoneIds.y);
int boneIndex2 = int(vertexBoneIds.z);
int boneIndex3 = int(vertexBoneIds.w);
// WARNING: OpenGL ES 2.0 does not support automatic matrix transposing, neither transpose() function
mat4 boneMatrixTransposed0 = mat4(
vec4(boneMatrices[boneIndex0][0].x, boneMatrices[boneIndex0][1].x, boneMatrices[boneIndex0][2].x, boneMatrices[boneIndex0][3].x),
vec4(boneMatrices[boneIndex0][0].y, boneMatrices[boneIndex0][1].y, boneMatrices[boneIndex0][2].y, boneMatrices[boneIndex0][3].y),
vec4(boneMatrices[boneIndex0][0].z, boneMatrices[boneIndex0][1].z, boneMatrices[boneIndex0][2].z, boneMatrices[boneIndex0][3].z),
vec4(boneMatrices[boneIndex0][0].w, boneMatrices[boneIndex0][1].w, boneMatrices[boneIndex0][2].w, boneMatrices[boneIndex0][3].w));
mat4 boneMatrixTransposed1 = mat4(
vec4(boneMatrices[boneIndex1][0].x, boneMatrices[boneIndex1][1].x, boneMatrices[boneIndex1][2].x, boneMatrices[boneIndex1][3].x),
vec4(boneMatrices[boneIndex1][0].y, boneMatrices[boneIndex1][1].y, boneMatrices[boneIndex1][2].y, boneMatrices[boneIndex1][3].y),
vec4(boneMatrices[boneIndex1][0].z, boneMatrices[boneIndex1][1].z, boneMatrices[boneIndex1][2].z, boneMatrices[boneIndex1][3].z),
vec4(boneMatrices[boneIndex1][0].w, boneMatrices[boneIndex1][1].w, boneMatrices[boneIndex1][2].w, boneMatrices[boneIndex1][3].w));
mat4 boneMatrixTransposed2 = mat4(
vec4(boneMatrices[boneIndex2][0].x, boneMatrices[boneIndex2][1].x, boneMatrices[boneIndex2][2].x, boneMatrices[boneIndex2][3].x),
vec4(boneMatrices[boneIndex2][0].y, boneMatrices[boneIndex2][1].y, boneMatrices[boneIndex2][2].y, boneMatrices[boneIndex2][3].y),
vec4(boneMatrices[boneIndex2][0].z, boneMatrices[boneIndex2][1].z, boneMatrices[boneIndex2][2].z, boneMatrices[boneIndex2][3].z),
vec4(boneMatrices[boneIndex2][0].w, boneMatrices[boneIndex2][1].w, boneMatrices[boneIndex2][2].w, boneMatrices[boneIndex2][3].w));
mat4 boneMatrixTransposed3 = mat4(
vec4(boneMatrices[boneIndex3][0].x, boneMatrices[boneIndex3][1].x, boneMatrices[boneIndex3][2].x, boneMatrices[boneIndex3][3].x),
vec4(boneMatrices[boneIndex3][0].y, boneMatrices[boneIndex3][1].y, boneMatrices[boneIndex3][2].y, boneMatrices[boneIndex3][3].y),
vec4(boneMatrices[boneIndex3][0].z, boneMatrices[boneIndex3][1].z, boneMatrices[boneIndex3][2].z, boneMatrices[boneIndex3][3].z),
vec4(boneMatrices[boneIndex3][0].w, boneMatrices[boneIndex3][1].w, boneMatrices[boneIndex3][2].w, boneMatrices[boneIndex3][3].w));
vec4 skinnedPosition =
vertexBoneWeights.x*(boneMatrixTransposed0*vec4(vertexPosition, 1.0)) +
vertexBoneWeights.y*(boneMatrixTransposed1*vec4(vertexPosition, 1.0)) +
vertexBoneWeights.z*(boneMatrixTransposed2*vec4(vertexPosition, 1.0)) +
vertexBoneWeights.w*(boneMatrixTransposed3*vec4(vertexPosition, 1.0));
fragTexCoord = vertexTexCoord;
fragColor = vertexColor;
gl_Position = mvp*skinnedPosition;
}
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