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Differential D16243 Diff 58431 source/blender/draw/engines/eevee/shaders/volumetric_scatter_frag.glsl

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source/blender/draw/engines/eevee/shaders/volumetric_scatter_frag.glsl

#pragma BLENDER_REQUIRE(volumetric_lib.glsl) #pragma BLENDER_REQUIRE(volumetric_lib.glsl)
/* Based on Frosbite Unified Volumetric. /* Based on Frosbite Unified Volumetric.
* https://www.ea.com/frostbite/news/physically-based-unified-volumetric-rendering-in-frostbite */ * https://www.ea.com/frostbite/news/physically-based-unified-volumetric-rendering-in-frostbite */
/* Step 2 : Evaluate all light scattering for each froxels. /* Step 2 : Evaluate all light scattering for each froxels.
* Also do the temporal reprojection to fight aliasing artifacts. */ * Also do the temporal reprojection to fight aliasing artifacts. */
uniform sampler3D volumeScattering;
uniform sampler3D volumeExtinction;
uniform sampler3D volumeEmission;
uniform sampler3D volumePhase;
uniform sampler3D historyScattering;
uniform sampler3D historyTransmittance;
flat in int slice;
layout(location = 0) out vec4 outScattering;
layout(location = 1) out vec4 outTransmittance;
void main() void main()
{ {
ivec3 volume_cell = ivec3(ivec2(gl_FragCoord.xy), slice); ivec3 volume_cell = ivec3(ivec2(gl_FragCoord.xy), volumetric_geom_iface.slice);
/* Emission */ /* Emission */
outScattering = texelFetch(volumeEmission, volume_cell, 0); outScattering = texelFetch(volumeEmission, volume_cell, 0);
outTransmittance = texelFetch(volumeExtinction, volume_cell, 0); outTransmittance = texelFetch(volumeExtinction, volume_cell, 0);
vec3 s_scattering = texelFetch(volumeScattering, volume_cell, 0).rgb; vec3 s_scattering = texelFetch(volumeScattering, volume_cell, 0).rgb;
vec3 volume_ndc = volume_to_ndc((vec3(volume_cell) + volJitter.xyz) * volInvTexSize.xyz); vec3 volume_ndc = volume_to_ndc((vec3(volume_cell) + volJitter.xyz) * volInvTexSize.xyz);
vec3 P = get_world_space_from_depth(volume_ndc.xy, volume_ndc.z); vec3 P = get_world_space_from_depth(volume_ndc.xy, volume_ndc.z);
vec3 V = cameraVec(P); vec3 V = cameraVec(P);
Show All 26 Lines for (int i = 0; i < MAX_LIGHT && i < laNumLight; i++) {
outScattering.rgb += Li * vis * s_scattering * outScattering.rgb += Li * vis * s_scattering *
phase_function(-V, l_vector.xyz / l_vector.w, s_anisotropy); phase_function(-V, l_vector.xyz / l_vector.w, s_anisotropy);
} }
#endif #endif
/* Temporal supersampling */ /* Temporal supersampling */
/* Note : this uses the cell non-jittered position (texel center). */ /* Note : this uses the cell non-jittered position (texel center). */
vec3 curr_ndc = volume_to_ndc(vec3(gl_FragCoord.xy, float(slice) + 0.5) * volInvTexSize.xyz); vec3 curr_ndc = volume_to_ndc(vec3(gl_FragCoord.xy, float(volumetric_geom_iface.slice) + 0.5) *
volInvTexSize.xyz);
vec3 wpos = get_world_space_from_depth(curr_ndc.xy, curr_ndc.z); vec3 wpos = get_world_space_from_depth(curr_ndc.xy, curr_ndc.z);
vec3 prev_ndc = project_point(pastViewProjectionMatrix, wpos); vec3 prev_ndc = project_point(pastViewProjectionMatrix, wpos);
vec3 prev_volume = ndc_to_volume(prev_ndc * 0.5 + 0.5); vec3 prev_volume = ndc_to_volume(prev_ndc * 0.5 + 0.5);
if ((volHistoryAlpha > 0.0) && all(greaterThan(prev_volume, vec3(0.0))) && if ((volHistoryAlpha > 0.0) && all(greaterThan(prev_volume, vec3(0.0))) &&
all(lessThan(prev_volume, vec3(1.0)))) { all(lessThan(prev_volume, vec3(1.0)))) {
vec4 h_Scattering = texture(historyScattering, prev_volume); vec4 h_Scattering = texture(historyScattering, prev_volume);
vec4 h_Transmittance = texture(historyTransmittance, prev_volume); vec4 h_Transmittance = texture(historyTransmittance, prev_volume);
Show All 10 Lines