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Delete leenkx/Shaders/voxel_light/voxel_light.comp.glsl

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Onek8
2025-05-21 00:00:02 +00:00
parent 76628fc010
commit 6b423038d4
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leenkx/Shaders/voxel_light/voxel_light.comp.glsl
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#version 450
layout (local_size_x = 8, local_size_y = 8, local_size_z = 8) in;
#include "compiled.inc"
#include "std/math.glsl"
#include "std/gbuffer.glsl"
#include "std/imageatomic.glsl"
#ifdef _VoxelShadow
#include "std/conetrace.glsl"
#endif
uniform vec3 lightPos;
uniform vec3 lightColor;
uniform int lightType;
uniform vec3 lightDir;
uniform vec2 spotData;
#ifdef _ShadowMap
uniform int lightShadow;
uniform vec2 lightProj;
uniform float shadowsBias;
uniform mat4 LVP;
#ifdef _ShadowMapAtlas
uniform int index;
uniform vec4 pointLightDataArray[maxLightsCluster * 6];
#endif
#endif
uniform float clipmaps[voxelgiClipmapCount * 10];
uniform int clipmapLevel;
uniform layout(r32ui) uimage3D voxelsLight;
#ifdef _ShadowMap
uniform sampler2DShadow shadowMap;
uniform sampler2D shadowMapTransparent;
uniform sampler2DShadow shadowMapSpot;
#ifdef _ShadowMapAtlas
uniform sampler2DShadow shadowMapPoint;
#else
uniform samplerCubeShadow shadowMapPoint;
#endif
#endif
#ifdef _ShadowMapAtlas
// https://www.khronos.org/registry/OpenGL/specs/gl/glspec20.pdf // p:168
// https://www.gamedev.net/forums/topic/687535-implementing-a-cube-map-lookup-function/5337472/
vec2 sampleCube(vec3 dir, out int faceIndex) {
vec3 dirAbs = abs(dir);
float ma;
vec2 uv;
if(dirAbs.z >= dirAbs.x && dirAbs.z >= dirAbs.y) {
faceIndex = dir.z < 0.0 ? 5 : 4;
ma = 0.5 / dirAbs.z;
uv = vec2(dir.z < 0.0 ? -dir.x : dir.x, -dir.y);
}
else if(dirAbs.y >= dirAbs.x) {
faceIndex = dir.y < 0.0 ? 3 : 2;
ma = 0.5 / dirAbs.y;
uv = vec2(dir.x, dir.y < 0.0 ? -dir.z : dir.z);
}
else {
faceIndex = dir.x < 0.0 ? 1 : 0;
ma = 0.5 / dirAbs.x;
uv = vec2(dir.x < 0.0 ? dir.z : -dir.z, -dir.y);
}
// downscale uv a little to hide seams
// transform coordinates from clip space to texture space
#ifndef _FlipY
return uv * 0.9976 * ma + 0.5;
#else
#ifdef HLSL
return uv * 0.9976 * ma + 0.5;
#else
return vec2(uv.x * ma, uv.y * -ma) * 0.9976 + 0.5;
#endif
#endif
}
#endif
float lpToDepth(vec3 lp, const vec2 lightProj) {
lp = abs(lp);
float zcomp = max(lp.x, max(lp.y, lp.z));
zcomp = lightProj.x - lightProj.y / zcomp;
return zcomp * 0.5 + 0.5;
}
void main() {
int res = voxelgiResolution.x;
for (int i = 0; i < 6; i++) {
ivec3 dst = ivec3(gl_GlobalInvocationID.xyz);
vec3 P = (gl_GlobalInvocationID.xyz + 0.5) / voxelgiResolution;
P = P * 2.0 - 1.0;
float visibility;
vec3 lp = lightPos - P;
vec3 l;
if (lightType == 0) { l = lightDir; visibility = 1.0; }
else { l = normalize(lp); visibility = attenuate(distance(P, lightPos)); }
#ifdef _ShadowMap
if (lightShadow == 1) {
vec4 lightPosition = LVP * vec4(P, 1.0);
vec3 lPos = lightPosition.xyz / lightPosition.w;
visibility = texture(shadowMap, vec3(lPos.xy, lPos.z - shadowsBias)).r;
}
else if (lightShadow == 2) {
vec4 lightPosition = LVP * vec4(P, 1.0);
vec3 lPos = lightPosition.xyz / lightPosition.w;
visibility *= texture(shadowMapSpot, vec3(lPos.xy, lPos.z - shadowsBias)).r;
}
else if (lightShadow == 3) {
#ifdef _ShadowMapAtlas
int faceIndex = 0;
const int lightIndex = index * 6;
const vec2 uv = sampleCube(-l, faceIndex);
vec4 pointLightTile = pointLightDataArray[lightIndex + faceIndex]; // x: tile X offset, y: tile Y offset, z: tile size relative to atlas
vec2 uvtiled = pointLightTile.z * uv + pointLightTile.xy;
#ifdef _FlipY
uvtiled.y = 1.0 - uvtiled.y; // invert Y coordinates for direct3d coordinate system
#endif
visibility *= texture(shadowMapPoint, vec3(uvtiled, lpToDepth(lp, lightProj) - shadowsBias)).r;
#else
visibility *= texture(shadowMapPoint, vec4(-l, lpToDepth(lp, lightProj) - shadowsBias)).r;
#endif
}
#endif
vec3 uvw_light = (P - vec3(clipmaps[int(clipmapLevel * 10 + 4)], clipmaps[int(clipmapLevel * 10 + 5)], clipmaps[int(clipmapLevel * 10 + 6)])) / (float(clipmaps[int(clipmapLevel * 10)]) * voxelgiResolution);
uvw_light = (uvw_light * 0.5 + 0.5);
if (any(notEqual(uvw_light, clamp(uvw_light, 0.0, 1.0)))) return;
vec3 writecoords_light = floor(uvw_light * voxelgiResolution);
imageAtomicMax(voxelsLight, ivec3(writecoords_light), uint(visibility * lightColor.r * 255));
imageAtomicMax(voxelsLight, ivec3(writecoords_light) + ivec3(0, 0, voxelgiResolution.x), uint(visibility * lightColor.g * 255));
imageAtomicMax(voxelsLight, ivec3(writecoords_light) + ivec3(0, 0, voxelgiResolution.x * 2), uint(visibility * lightColor.b * 255));
}
}