source: data/branches/Shader_HS18/programs/GLSL120/DualQuaternion_TwoPhaseShadowCaster.glsl @ 12373

#version 120

mat2x4 blendTwoWeightsAntipod(vec4 blendWgt, vec4 blendIdx, vec4 dualQuaternions[48]);
vec3 calculateBlendPosition(vec3 position, mat2x4 blendDQ);

uniform vec4 worldDualQuaternion2x4Array[48];
uniform vec4 scaleM[72];
uniform mat4 viewProjectionMatrix;
uniform vec4   ambient;

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

varying vec4 colour;

//Shadow caster pass
void main()
{       
        //First phase - applies scaling and shearing:
        int blendIndicesX = int(blendIndices.x) * 3;
        int blendIndicesY = int(blendIndices.y) * 3;
        
        mat3x4 blendS = blendWeights.x*mat3x4(scaleM[blendIndicesX], 
                scaleM[blendIndicesX + 1], scaleM[blendIndicesX + 2]);
        
        blendS += blendWeights.y*mat3x4(scaleM[blendIndicesY],                                          scaleM[blendIndicesY + 1], scaleM[blendIndicesY + 2]);

        mat4x3 blendF = transpose(blendS);

        vec3 pass1_position = blendF * vertex;

        //Second phase
        mat2x4 blendDQ = blendTwoWeightsAntipod(blendWeights, blendIndices, worldDualQuaternion2x4Array);

        blendDQ /= length(blendDQ[0]);

        vec3 blendPosition = calculateBlendPosition(pass1_position, blendDQ);
        
        gl_Position =  viewProjectionMatrix * vec4(blendPosition, 1.0);

        gl_FrontColor = ambient;
}