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