53 lines
1.2 KiB
Plaintext
53 lines
1.2 KiB
Plaintext
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uniform mat4 SunCamMatrix;
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layout (local_size_x = 4) in;
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struct CascadeBoundingBox
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{
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int xmin;
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int xmax;
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int ymin;
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int ymax;
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int zmin;
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int zmax;
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};
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layout (std430) buffer BoundingBoxes
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{
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CascadeBoundingBox BB[4];
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};
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layout (std140) buffer NewMatrixData
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{
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mat4 ShadowMatrixes[4];
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};
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mat4 buildProjectionMatrixOrthoLH(float left, float right, float up, float down, float zNear, float zFar)
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{
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mat4 M;
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M[0] = vec4(2. / (right - left), 0., 0., 0.);
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M[1] = vec4(0., 2. / (up - down), 0., 0.);
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M[2] = vec4(0., 0., 1. / (zFar - zNear), 0.);
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M[3].x = - (right + left) / (right - left);
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M[3].y = - (up + down) / (up - down);
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M[3].z = zNear / (zNear - zFar);
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M[3].w = 1.;
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return M;
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}
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void main()
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{
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if (gl_LocalInvocationIndex > 3)
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return;
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ShadowMatrixes[gl_LocalInvocationIndex] = buildProjectionMatrixOrthoLH(
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BB[gl_LocalInvocationIndex].xmin / 4. - 1., BB[gl_LocalInvocationIndex].xmax / 4. + 1.,
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BB[gl_LocalInvocationIndex].ymax / 4. + 1., BB[gl_LocalInvocationIndex].ymin / 4. - 1.,
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BB[gl_LocalInvocationIndex].zmin / 4. - 100., BB[gl_LocalInvocationIndex].zmax / 4. + 1.) * SunCamMatrix;
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}
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