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https://github.com/TES3MP/openmw-tes3mp.git
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34 lines
1.3 KiB
GLSL
34 lines
1.3 KiB
GLSL
#version 120
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varying vec3 screenCoordsPassthrough;
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varying vec4 position;
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varying float depthPassthrough;
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uniform int shadowTextureUnit0;
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uniform int shadowTextureUnit1;
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varying vec4 shadowSpaceCoords0;
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varying vec4 shadowSpaceCoords1;
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void main(void)
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{
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gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;
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mat4 scalemat = mat4(0.5, 0.0, 0.0, 0.0,
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0.0, -0.5, 0.0, 0.0,
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0.0, 0.0, 0.5, 0.0,
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0.5, 0.5, 0.5, 1.0);
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vec4 texcoordProj = ((scalemat) * ( gl_Position));
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screenCoordsPassthrough = vec3(texcoordProj.x, texcoordProj.y, texcoordProj.w);
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position = gl_Vertex;
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depthPassthrough = gl_Position.z;
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vec4 viewPos = gl_ModelViewMatrix * gl_Vertex;
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// This matrix has the opposite handedness to the others used here, so multiplication must have the vector to the left. Alternatively it could be transposed after construction, but that's extra work for the GPU just to make the code look a tiny bit cleaner.
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mat4 eyePlaneMat = mat4(gl_EyePlaneS[shadowTextureUnit0], gl_EyePlaneT[shadowTextureUnit0], gl_EyePlaneR[shadowTextureUnit0], gl_EyePlaneQ[shadowTextureUnit0]);
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shadowSpaceCoords0 = viewPos * eyePlaneMat;
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eyePlaneMat = mat4(gl_EyePlaneS[shadowTextureUnit1], gl_EyePlaneT[shadowTextureUnit1], gl_EyePlaneR[shadowTextureUnit1], gl_EyePlaneQ[shadowTextureUnit1]);
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shadowSpaceCoords1 = viewPos * eyePlaneMat;
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}
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