Campbell Barton
e12c08e8d1
Apply clang format as proposed in T53211. For details on usage and instructions for migrating branches without conflicts, see: https://wiki.blender.org/wiki/Tools/ClangFormat
80 lines
2.9 KiB
GLSL
80 lines
2.9 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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/* Step 2 : Evaluate all light scattering for each froxels.
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* Also do the temporal reprojection to fight aliasing artifacts. */
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uniform sampler3D volumeScattering;
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uniform sampler3D volumeExtinction;
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uniform sampler3D volumeEmission;
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uniform sampler3D volumePhase;
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uniform sampler3D historyScattering;
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uniform sampler3D historyTransmittance;
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flat in int slice;
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layout(location = 0) out vec4 outScattering;
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layout(location = 1) out vec4 outTransmittance;
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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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/* Emission */
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outScattering = texelFetch(volumeEmission, volume_cell, 0);
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outTransmittance = texelFetch(volumeExtinction, volume_cell, 0);
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vec3 s_scattering = texelFetch(volumeScattering, volume_cell, 0).rgb;
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vec3 volume_ndc = volume_to_ndc((vec3(volume_cell) + volJitter.xyz) * volInvTexSize.xyz);
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vec3 worldPosition = get_world_space_from_depth(volume_ndc.xy, volume_ndc.z);
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vec3 wdir = cameraVec;
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vec2 phase = texelFetch(volumePhase, volume_cell, 0).rg;
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float s_anisotropy = phase.x / max(1.0, phase.y);
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/* Environment : Average color. */
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outScattering.rgb += irradiance_volumetric(worldPosition) * s_scattering *
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phase_function_isotropic();
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#ifdef VOLUME_LIGHTING /* Lights */
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for (int i = 0; i < MAX_LIGHT && i < laNumLight; ++i) {
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LightData ld = lights_data[i];
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vec4 l_vector;
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l_vector.xyz = (ld.l_type == SUN) ? -ld.l_forward : ld.l_position - worldPosition;
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l_vector.w = length(l_vector.xyz);
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float Vis = light_visibility(ld, worldPosition, l_vector);
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vec3 Li = light_volume(ld, l_vector) *
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light_volume_shadow(ld, worldPosition, l_vector, volumeExtinction);
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outScattering.rgb += Li * Vis * s_scattering *
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phase_function(-wdir, l_vector.xyz / l_vector.w, s_anisotropy);
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}
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#endif
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/* Temporal supersampling */
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/* Note : this uses the cell non-jittered position (texel center). */
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vec3 curr_ndc = volume_to_ndc(vec3(gl_FragCoord.xy, float(slice) + 0.5) * volInvTexSize.xyz);
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vec3 wpos = get_world_space_from_depth(curr_ndc.xy, curr_ndc.z);
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vec3 prev_ndc = project_point(pastViewProjectionMatrix, wpos);
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vec3 prev_volume = ndc_to_volume(prev_ndc * 0.5 + 0.5);
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if ((volHistoryAlpha > 0.0) && all(greaterThan(prev_volume, vec3(0.0))) &&
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all(lessThan(prev_volume, vec3(1.0)))) {
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vec4 h_Scattering = texture(historyScattering, prev_volume);
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vec4 h_Transmittance = texture(historyTransmittance, prev_volume);
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outScattering = mix(outScattering, h_Scattering, volHistoryAlpha);
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outTransmittance = mix(outTransmittance, h_Transmittance, volHistoryAlpha);
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}
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/* Catch NaNs */
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if (any(isnan(outScattering)) || any(isnan(outTransmittance))) {
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outScattering = vec4(0.0);
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outTransmittance = vec4(1.0);
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}
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}
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