55 lines
1.5 KiB
GLSL
Executable file
55 lines
1.5 KiB
GLSL
Executable file
// http://simonstechblog.blogspot.sk/2013/01/implementing-voxel-cone-tracing.html
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// http://leifnode.com/2015/05/voxel-cone-traced-global-illumination/
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// http://www.seas.upenn.edu/%7Epcozzi/OpenGLInsights/OpenGLInsights-SparseVoxelization.pdf
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// https://github.com/Cigg/Voxel-Cone-Tracing
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// https://research.nvidia.com/sites/default/files/publications/GIVoxels-pg2011-authors.pdf
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#version 450
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#extension GL_ARB_shader_image_load_store : enable
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in fragData {
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#ifdef _Tex
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vec2 texuv;
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#endif
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flat int axis;
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vec4 lPos;
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} frag;
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uniform layout(RGBA8) image3D voxels;
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#ifdef _BaseTex
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uniform sampler2D sbase;
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#endif
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uniform vec4 baseCol;
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uniform sampler2D shadowMap;
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const int voxelDimensions = 512;
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void main() {
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#ifdef _BaseTex
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vec4 matCol = texture(sbase, frag.texuv);
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#else
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vec4 matCol = baseCol;
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#endif
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// vec4 lPosH = frag.lPos / frag.lPos.w;
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// float distanceFromLight = texture(shadowMap, lPosH.xy).r * 2.0 - 1.0;
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// const float shadowsBias = 0.0001;
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// float visibility = float(distanceFromLight > lPosH.z - shadowsBias);
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float visibility = 1.0;
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ivec3 camPos = ivec3(gl_FragCoord.x, gl_FragCoord.y, voxelDimensions * gl_FragCoord.z);
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ivec3 texPos;
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if (frag.axis == 1) {
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texPos.x = voxelDimensions - camPos.z;
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texPos.z = camPos.x;
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texPos.y = camPos.y;
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}
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else if (frag.axis == 2) {
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texPos.z = camPos.y;
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texPos.y = voxelDimensions - camPos.z;
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texPos.x = camPos.x;
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}
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else {
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texPos = camPos;
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}
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texPos.z = voxelDimensions - texPos.z - 1;
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imageStore(voxels, texPos, vec4(matCol.rgb * visibility, 1.0));
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} |