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| Original file line number | Diff line number | Diff line change |
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| #version 450 | ||
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| #extension GL_GOOGLE_include_directive : enable | ||
| #extension GL_ARB_separate_shader_objects : enable | ||
| #extension GL_EXT_samplerless_texture_functions : enable | ||
| // #extension GL_KHR_memory_scope_semantics : enable | ||
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| #include "virtual_shadow/vsm_common.glsl" | ||
| #include "lighting/tonemapping.glsl" | ||
| #include "scene.glsl" | ||
| #include "common.glsl" | ||
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| layout(local_size_x = 32, local_size_y = 32) in; | ||
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| const uint NumThreads = gl_WorkGroupSize.x*gl_WorkGroupSize.y*gl_WorkGroupSize.z; | ||
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| layout(binding = 0, std140) uniform UboScene { | ||
| SceneDesc scene; | ||
| }; | ||
| layout(binding = 1) uniform texture2D gbufDiffuse; | ||
| layout(binding = 2) uniform utexture2D gbufNormal; | ||
| layout(binding = 3) uniform texture2D gbufDepth; | ||
| layout(binding = 4, r32ui) uniform uimage3D pageTbl; | ||
| layout(binding = 5, r32ui) uniform uimage3D pageTblDepth; | ||
| // layout(binding = 6, r32ui) uniform writeonly restrict uimage2D occlusionLut; | ||
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| const float dFogMin = 0; | ||
| const float dFogMax = 0.9999; | ||
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| ivec2 fragCoord = ivec2(gl_GlobalInvocationID.xy); | ||
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| shared uint tileDepthMin, tileDepthMax; | ||
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| void markPage(ivec3 at, float z) { | ||
| imageAtomicExchange(pageTbl, at, 1u); | ||
| imageAtomicMin(pageTblDepth, at, floatBitsToUint(z)); | ||
| } | ||
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| void hiTile(float depth) { | ||
| uint d = floatBitsToUint(depth); | ||
| atomicMax(tileDepthMax, d); | ||
| atomicMin(tileDepthMin, d); | ||
| } | ||
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| float interleavedGradientNoise() { | ||
| return interleavedGradientNoise(fragCoord.xy); | ||
| } | ||
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| vec3 project(mat4 m, vec3 pos) { | ||
| vec4 p = m*vec4(pos,1); | ||
| return p.xyz/p.w; | ||
| } | ||
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| void shadowFactor(vec4 shPos) { | ||
| vec3 shPos0 = shPos.xyz/shPos.w; | ||
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| int mip = vsmCalcMipIndex(shPos0.xy, VSM_FOG_MIP); | ||
| vec2 page = shPos0.xy / (1 << mip); | ||
| if(any(greaterThan(abs(page), vec2(1)))) | ||
| return; | ||
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| ivec2 pageI = ivec2((page*0.5+0.5)*VSM_PAGE_TBL_SIZE); | ||
| ivec3 at = ivec3(pageI, mip); | ||
| markPage(at, shPos0.z); | ||
| } | ||
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| void fogPages(const float depthMax) { | ||
| const int steps = 32; | ||
| const uint lane = gl_LocalInvocationIndex; | ||
| const float noise = interleavedGradientNoise()/steps; | ||
| const ivec2 size = textureSize(gbufDepth, 0).xy; | ||
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| const vec2 frPos = vec2(gl_WorkGroupID.xy*gl_WorkGroupSize.xy) + vec2(gl_WorkGroupSize.xy)*0.5; | ||
| const vec2 inPos = (vec2(frPos+vec2(0.5))/vec2(size))*2.0 - vec2(1.0); | ||
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| const vec3 pos0 = project(scene.viewProjectLwcInv, vec3(inPos, dFogMin)); | ||
| const vec3 pos1 = project(scene.viewProjectLwcInv, vec3(inPos, dFogMax)); | ||
| const vec3 posz = project(scene.viewProjectLwcInv, vec3(inPos, depthMax)); | ||
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| const vec4 shPos0 = scene.viewVirtualShadowLwc*vec4(pos0, 1); | ||
| const vec4 shPos1 = scene.viewVirtualShadowLwc*vec4(posz, 1); | ||
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| const vec3 ray = pos1.xyz - pos0.xyz; | ||
| const float dist = length(ray)*0.01; // meters | ||
| const float distZ = length(posz-pos0)*0.01; // meters | ||
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| if(lane < steps) { | ||
| float t = (lane+0.3)/float(steps); | ||
| float dd = (t*distZ)/(dist); | ||
| vec4 shPos = mix(shPos0, shPos1, t+noise); | ||
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| shadowFactor(shPos); | ||
| } | ||
| /* | ||
| uint occlusion = 0; | ||
| [[dont_unroll]] | ||
| for(uint i=0; i<steps; ++i) { | ||
| float t = (i+0.3)/float(steps); | ||
| float dd = (t*distZ)/(dist); | ||
| vec4 shPos = mix(shPos0,shPos1,t+noise); | ||
| bool shadow = shadowFactor(shPos); | ||
| occlusion = occlusion | ((shadow ? 1u : 0u) << uint(i)); | ||
| } | ||
| imageStore(occlusionLut, ivec2(invocationID.xy), uvec4(occlusion)); | ||
| */ | ||
| } | ||
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| void main() { | ||
| tileDepthMin = floatBitsToUint(1); | ||
| tileDepthMax = floatBitsToUint(0); | ||
| barrier(); | ||
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| const ivec2 imgSize = ivec2(textureSize(gbufDepth, 0)); | ||
| const bool valid = all(lessThan(fragCoord, imgSize)); | ||
| // const vec3 normal = valid ? normalFetch(gbufNormal, pix) : vec3(0); | ||
| const float depth = valid ? texelFetch(gbufDepth, fragCoord, 0).x : 1; | ||
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| if(valid) | ||
| hiTile(depth); | ||
| barrier(); | ||
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| fogPages(uintBitsToFloat(tileDepthMax)); | ||
| } |