source: data/data_extern/programs/GLSL120/DualQuaternion_ShadowCaster.glsl

#version 120

mat2x4 blendTwoWeightsAntipod(vec4 blendWgt, vec4 blendIdx, vec4 dualQuaternions[24]);
vec3 calculateBlendPosition(vec3 position, mat2x4 blendDQ);

uniform vec4 worldDualQuaternion2x4Array[24];
uniform mat4 viewProjectionMatrix;
uniform vec4   ambient;

attribute vec4 vertex;
attribute vec4 blendIndices;
attribute vec4 blendWeights;

//Shadow caster pass
void main()
{
        mat2x4 blendDQ = blendTwoWeightsAntipod(blendWeights, blendIndices, worldDualQuaternion2x4Array);

        float len = length(blendDQ[0]);
        blendDQ /= len;

        vec3 blendPosition = calculateBlendPosition(vertex.xyz, blendDQ);

        // view / projection
        gl_Position = viewProjectionMatrix * vec4(blendPosition, 1.0);
        
        gl_FrontColor = ambient;
}