64 lines
1.8 KiB
GLSL
64 lines
1.8 KiB
GLSL
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/* Based on Frosbite Unified Volumetric.
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* https://www.ea.com/frostbite/news/physically-based-unified-volumetric-rendering-in-frostbite */
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#define NODETREE_EXEC
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#ifdef MESH_SHADER
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uniform vec3 volumeOrcoLoc;
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uniform vec3 volumeOrcoSize;
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#endif
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flat in int slice;
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/* Warning: these are not attributes, these are global vars. */
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vec3 worldPosition = vec3(0.0);
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vec3 viewPosition = vec3(0.0);
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vec3 viewNormal = vec3(0.0);
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#ifdef MESH_SHADER
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vec3 volumeObjectLocalCoord = vec3(0.0);
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#endif
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layout(location = 0) out vec4 volumeScattering;
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layout(location = 1) out vec4 volumeExtinction;
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layout(location = 2) out vec4 volumeEmissive;
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layout(location = 3) out vec4 volumePhase;
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/* Store volumetric properties into the froxel textures. */
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void main()
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{
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ivec3 volume_cell = ivec3(gl_FragCoord.xy, slice);
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vec3 ndc_cell = volume_to_ndc((vec3(volume_cell) + volJitter.xyz) * volInvTexSize.xyz);
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viewPosition = get_view_space_from_depth(ndc_cell.xy, ndc_cell.z);
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worldPosition = point_view_to_world(viewPosition);
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#ifdef MESH_SHADER
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volumeObjectLocalCoord = point_world_to_object(worldPosition);
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volumeObjectLocalCoord = (volumeObjectLocalCoord - volumeOrcoLoc + volumeOrcoSize) /
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(volumeOrcoSize * 2.0);
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if (any(lessThan(volumeObjectLocalCoord, vec3(0.0))) ||
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any(greaterThan(volumeObjectLocalCoord, vec3(1.0))))
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discard;
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#endif
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#ifdef CLEAR
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Closure cl = CLOSURE_DEFAULT;
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#else
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Closure cl = nodetree_exec();
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#endif
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volumeScattering = vec4(cl.scatter, 1.0);
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volumeExtinction = vec4(cl.absorption + cl.scatter, 1.0);
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volumeEmissive = vec4(cl.emission, 1.0);
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/* Do not add phase weight if no scattering. */
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if (all(equal(cl.scatter, vec3(0.0)))) {
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volumePhase = vec4(0.0);
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}
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else {
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volumePhase = vec4(cl.anisotropy, vec3(1.0));
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}
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}
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