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uniform mat4 ModelViewProjectionMatrix;
uniform vec3 OrcoTexCoFactors[2];
uniform float slicePosition;
uniform int sliceAxis; /* -1 is no slice, 0 is X, 1 is Y, 2 is Z. */
in vec3 pos;
#ifdef VOLUME_SLICE
in vec3 uvs;
out vec3 localPos;
#endif
void main()
{
#ifdef VOLUME_SLICE
if (sliceAxis == 0) {
localPos = vec3(slicePosition * 2.0 - 1.0, pos.xy);
}
else if (sliceAxis == 1) {
localPos = vec3(pos.x, slicePosition * 2.0 - 1.0, pos.y);
}
else {
localPos = vec3(pos.xy, slicePosition * 2.0 - 1.0);
}
vec3 final_pos = localPos;
#else
vec3 final_pos = pos;
#endif
final_pos = ((final_pos * 0.5 + 0.5) - OrcoTexCoFactors[0]) / OrcoTexCoFactors[1];
gl_Position = ModelViewProjectionMatrix * vec4(final_pos, 1.0);
}
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