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Update leenkx/Shaders/std/shadows.glsl

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Onek8
2025-06-03 03:09:32 +00:00
parent 63565052e3
commit b5af208766
1 changed files with 103 additions and 89 deletions
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188
leenkx/Shaders/std/shadows.glsl
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@ -58,7 +58,15 @@ vec2 sampleCube(vec3 dir, out int faceIndex) {
} }
#endif #endif
vec3 PCF(sampler2DShadow shadowMap, sampler2D shadowMapTransparent, const vec2 uv, const float compare, const vec2 smSize, const bool transparent) { vec3 PCF(sampler2DShadow shadowMap,
#ifdef _ShadowMapTransparent
sampler2D shadowMapTransparent,
#endif
const vec2 uv, const float compare, const vec2 smSize
#ifdef _ShadowMapTransparent
, const bool transparent
#endif
) {
vec3 result = vec3(0.0); vec3 result = vec3(0.0);
result.x = texture(shadowMap, vec3(uv + (vec2(-1.0, -1.0) / smSize), compare)); result.x = texture(shadowMap, vec3(uv + (vec2(-1.0, -1.0) / smSize), compare));
result.x += texture(shadowMap, vec3(uv + (vec2(-1.0, 0.0) / smSize), compare)); result.x += texture(shadowMap, vec3(uv + (vec2(-1.0, 0.0) / smSize), compare));
@ -71,11 +79,13 @@ vec3 PCF(sampler2DShadow shadowMap, sampler2D shadowMapTransparent, const vec2 u
result.x += texture(shadowMap, vec3(uv + (vec2(1.0, 1.0) / smSize), compare)); result.x += texture(shadowMap, vec3(uv + (vec2(1.0, 1.0) / smSize), compare));
result = result.xxx / 9.0; result = result.xxx / 9.0;
#ifdef _ShadowMapTransparent
if (transparent == false) { if (transparent == false) {
vec4 shadowmap_transparent = texture(shadowMapTransparent, uv); vec4 shadowmap_transparent = texture(shadowMapTransparent, uv);
if (shadowmap_transparent.a < compare) if (shadowmap_transparent.a < compare)
result *= shadowmap_transparent.rgb; result *= shadowmap_transparent.rgb;
} }
#endif
return result; return result;
} }
@ -87,7 +97,15 @@ float lpToDepth(vec3 lp, const vec2 lightProj) {
return zcomp * 0.5 + 0.5; return zcomp * 0.5 + 0.5;
} }
vec3 PCFCube(samplerCubeShadow shadowMapCube, samplerCube shadowMapCubeTransparent, const vec3 lp, vec3 ml, const float bias, const vec2 lightProj, const vec3 n, const bool transparent) { vec3 PCFCube(samplerCubeShadow shadowMapCube,
#ifdef _ShadowMapTransparent
samplerCube shadowMapCubeTransparent,
#endif
const vec3 lp, vec3 ml, const float bias, const vec2 lightProj, const vec3 n
#ifdef _ShadowMapTransparent
, const bool transparent
#endif
) {
const float s = shadowmapCubePcfSize; // TODO: incorrect... const float s = shadowmapCubePcfSize; // TODO: incorrect...
float compare = lpToDepth(lp, lightProj) - bias * 1.5; float compare = lpToDepth(lp, lightProj) - bias * 1.5;
ml = ml + n * bias * 20; ml = ml + n * bias * 20;
@ -106,11 +124,13 @@ vec3 PCFCube(samplerCubeShadow shadowMapCube, samplerCube shadowMapCubeTranspare
result.x += texture(shadowMapCube, vec4(ml + vec3(-s, -s, -s), compare)); result.x += texture(shadowMapCube, vec4(ml + vec3(-s, -s, -s), compare));
result = result.xxx / 9.0; result = result.xxx / 9.0;
#ifdef _ShadowMapTransparent
if (transparent == false) { if (transparent == false) {
vec4 shadowmap_transparent = texture(shadowMapCubeTransparent, ml); vec4 shadowmap_transparent = texture(shadowMapCubeTransparent, ml);
if (shadowmap_transparent.a < compare) if (shadowmap_transparent.a < compare)
result *= shadowmap_transparent.rgb; result *= shadowmap_transparent.rgb;
} }
#endif
return result; return result;
} }
@ -209,32 +229,57 @@ vec2 transformOffsetedUV(const int faceIndex, out int newFaceIndex, vec2 uv) {
return uv; return uv;
} }
vec3 PCFFakeCube(sampler2DShadow shadowMap, sampler2D shadowMapTransparent, const vec3 lp, vec3 ml, const float bias, const vec2 lightProj, const vec3 n, const int index, const bool transparent) { vec3 PCFFakeCube(sampler2DShadow shadowMap,
#ifdef _ShadowMapTransparent
sampler2D shadowMapTransparent,
#endif
const vec3 lp, vec3 ml, const float bias, const vec2 lightProj, const vec3 n, const int index
#ifdef _ShadowMapTransparent
, const bool transparent
#endif
) {
const vec2 smSize = smSizeUniform; // TODO: incorrect... const vec2 smSize = smSizeUniform; // TODO: incorrect...
const float compare = lpToDepth(lp, lightProj) - bias * 1.5; const float compare = lpToDepth(lp, lightProj) - bias * 1.5;
ml = ml + n * bias * 20; ml = ml + n * bias * 20;
int faceIndex = 0; int faceIndex = 0;
const int lightIndex = index * 6; const int lightIndex = index * 6;
const vec2 uv = sampleCube(ml, faceIndex); const vec2 uv = sampleCube(ml, faceIndex);
vec4 pointLightTile = pointLightDataArray[lightIndex + faceIndex]; // x: tile X offset, y: tile Y offset, z: tile size relative to atlas 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; vec2 uvtiled = pointLightTile.z * uv + pointLightTile.xy;
#ifdef _FlipY #ifdef _FlipY
uvtiled.y = 1.0 - uvtiled.y; // invert Y coordinates for direct3d coordinate system uvtiled.y = 1.0 - uvtiled.y; // invert Y coordinates for direct3d coordinate system
#endif #endif
if (any(lessThan(uvtiled, vec2(0.0))) || any(greaterThan(uvtiled, vec2(1.0)))) {
return vec3(1.0); // Or handle edge cases differently
}
vec3 result = vec3(0.0); vec3 result = vec3(0.0);
result.x += texture(shadowMap, vec3(uvtiled, compare)); // In PCFFakeCube(), modify the sampling pattern to be more robust:
// soft shadowing const vec2 offsets[9] = vec2[](
int newFaceIndex = 0; vec2(0, 0),
uvtiled = transformOffsetedUV(faceIndex, newFaceIndex, vec2(uv + (vec2(-1.0, 0.0) / smSize))); vec2(1, 0), vec2(-1, 0), vec2(0, 1), vec2(0, -1),
vec2(1, 1), vec2(-1, 1), vec2(1, -1), vec2(-1, -1)
);
for (int i = 0; i < 9; i++) {
vec2 sampleUV = uv + offsets[i] / smSize;
int newFaceIndex;
vec2 transformedUV = transformOffsetedUV(faceIndex, newFaceIndex, sampleUV);
pointLightTile = pointLightDataArray[lightIndex + newFaceIndex]; pointLightTile = pointLightDataArray[lightIndex + newFaceIndex];
uvtiled = pointLightTile.z * uvtiled + pointLightTile.xy; uvtiled = pointLightTile.z * transformedUV + pointLightTile.xy;
#ifdef _FlipY
uvtiled.y = 1.0 - uvtiled.y;
#endif
result.x += texture(shadowMap, vec3(uvtiled, compare));
}
result = result.xxx / 9.0;
pointLightTile = pointLightDataArray[lightIndex + faceIndex]; // x: tile X offset, y: tile Y offset, z: tile size relative to atlas
uvtiled = pointLightTile.z * uv + pointLightTile.xy;
#ifdef _FlipY #ifdef _FlipY
uvtiled.y = 1.0 - uvtiled.y; // invert Y coordinates for direct3d coordinate system uvtiled.y = 1.0 - uvtiled.y; // invert Y coordinates for direct3d coordinate system
#endif #endif
result.x += texture(shadowMap, vec3(uvtiled, compare));
#ifdef _ShadowMapTransparent #ifdef _ShadowMapTransparent
if (transparent == false) { if (transparent == false) {
@ -244,88 +289,39 @@ vec3 PCFFakeCube(sampler2DShadow shadowMap, sampler2D shadowMapTransparent, cons
} }
#endif #endif
result.x += texture(shadowMap, vec3(uvtiled, compare));
uvtiled = transformOffsetedUV(faceIndex, newFaceIndex, vec2(uv + (vec2(0.0, -1.0) / smSize)));
pointLightTile = pointLightDataArray[lightIndex + newFaceIndex];
uvtiled = pointLightTile.z * uvtiled + pointLightTile.xy;
#ifdef _FlipY
uvtiled.y = 1.0 - uvtiled.y; // invert Y coordinates for direct3d coordinate system
#endif
result.x += texture(shadowMap, vec3(uvtiled, compare));
uvtiled = transformOffsetedUV(faceIndex, newFaceIndex, vec2(uv + (vec2(-1.0, -1.0) / smSize)));
pointLightTile = pointLightDataArray[lightIndex + newFaceIndex];
uvtiled = pointLightTile.z * uvtiled + pointLightTile.xy;
#ifdef _FlipY
uvtiled.y = 1.0 - uvtiled.y; // invert Y coordinates for direct3d coordinate system
#endif
result.x += texture(shadowMap, vec3(uvtiled, compare));
uvtiled = transformOffsetedUV(faceIndex, newFaceIndex, vec2(uv + (vec2(0.0, 1.0) / smSize)));
pointLightTile = pointLightDataArray[lightIndex + newFaceIndex];
uvtiled = pointLightTile.z * uvtiled + pointLightTile.xy;
#ifdef _FlipY
uvtiled.y = 1.0 - uvtiled.y; // invert Y coordinates for direct3d coordinate system
#endif
result.x += texture(shadowMap, vec3(uvtiled, compare));
uvtiled = transformOffsetedUV(faceIndex, newFaceIndex, vec2(uv + (vec2(1.0, -1.0) / smSize)));
pointLightTile = pointLightDataArray[lightIndex + newFaceIndex];
uvtiled = pointLightTile.z * uvtiled + pointLightTile.xy;
#ifdef _FlipY
uvtiled.y = 1.0 - uvtiled.y; // invert Y coordinates for direct3d coordinate system
#endif
result.x += texture(shadowMap, vec3(uvtiled, compare));
uvtiled = transformOffsetedUV(faceIndex, newFaceIndex, vec2(uv + (vec2(1.0, 0.0) / smSize)));
pointLightTile = pointLightDataArray[lightIndex + newFaceIndex];
uvtiled = pointLightTile.z * uvtiled + pointLightTile.xy;
#ifdef _FlipY
uvtiled.y = 1.0 - uvtiled.y; // invert Y coordinates for direct3d coordinate system
#endif
result.x += texture(shadowMap, vec3(uvtiled, compare));
uvtiled = transformOffsetedUV(faceIndex, newFaceIndex, vec2(uv + (vec2(1.0, 1.0) / smSize)));
pointLightTile = pointLightDataArray[lightIndex + newFaceIndex];
uvtiled = pointLightTile.z * uvtiled + pointLightTile.xy;
#ifdef _FlipY
uvtiled.y = 1.0 - uvtiled.y; // invert Y coordinates for direct3d coordinate system
#endif
result.x += texture(shadowMap, vec3(uvtiled, compare));
result = result.xxx / 9.0;
pointLightTile = pointLightDataArray[lightIndex + faceIndex]; // x: tile X offset, y: tile Y offset, z: tile size relative to atlas
uvtiled = pointLightTile.z * uv + pointLightTile.xy;
#ifdef _FlipY
uvtiled.y = 1.0 - uvtiled.y; // invert Y coordinates for direct3d coordinate system
#endif
if (transparent == false) {
vec4 shadowmap_transparent = texture(shadowMapTransparent, uvtiled);
if (shadowmap_transparent.a < compare)
result *= shadowmap_transparent.rgb;
}
return result; return result;
} }
#endif #endif
vec3 shadowTest(sampler2DShadow shadowMap, sampler2D shadowMapTransparent, const vec3 lPos, const float shadowsBias, const bool transparent) { vec3 shadowTest(sampler2DShadow shadowMap,
#ifdef _ShadowMapTransparent
sampler2D shadowMapTransparent,
#endif
const vec3 lPos, const float shadowsBias
#ifdef _ShadowMapTransparent
, const bool transparent
#endif
) {
#ifdef _SMSizeUniform #ifdef _SMSizeUniform
vec2 smSize = smSizeUniform; vec2 smSize = smSizeUniform;
#else #else
const vec2 smSize = shadowmapSize; const vec2 smSize = shadowmapSize;
#endif #endif
if (lPos.x < 0.0 || lPos.y < 0.0 || lPos.x > 1.0 || lPos.y > 1.0) return vec3(1.0); if (lPos.x < 0.0 || lPos.y < 0.0 || lPos.x > 1.0 || lPos.y > 1.0) return vec3(1.0);
return PCF(shadowMap, shadowMapTransparent, lPos.xy, lPos.z - shadowsBias, smSize, transparent); return PCF(shadowMap,
#ifdef _ShadowMapTransparent
shadowMapTransparent,
#endif
lPos.xy, lPos.z - shadowsBias, smSize
#ifdef _ShadowMapTransparent
, transparent
#endif
);
} }
#ifdef _CSM #ifdef _CSM
mat4 getCascadeMat(const float d, out int casi, out int casIndex) { mat4 getCascadeMat(const float d, out int casi, out int casIndex) {
const int c = shadowmapCascades; const int c = shadowmapCascades;
// Get cascade index // Get cascade index
// TODO: use bounding box slice selection instead of sphere // TODO: use bounding box slice selection instead of sphere
const vec4 ci = vec4(float(c > 0), float(c > 1), float(c > 2), float(c > 3)); const vec4 ci = vec4(float(c > 0), float(c > 1), float(c > 2), float(c > 3));
@ -341,21 +337,26 @@ mat4 getCascadeMat(const float d, out int casi, out int casIndex) {
float(d > casData[c * 4].z), float(d > casData[c * 4].z),
float(d > casData[c * 4].w)); float(d > casData[c * 4].w));
casi = int(min(dot(ci, comp), c)); casi = int(min(dot(ci, comp), c));
// Get cascade mat // Get cascade mat
casIndex = casi * 4; casIndex = casi * 4;
return mat4( return mat4(
casData[casIndex ], casData[casIndex ],
casData[casIndex + 1], casData[casIndex + 1],
casData[casIndex + 2], casData[casIndex + 2],
casData[casIndex + 3]); casData[casIndex + 3]);
// if (casIndex == 0) return mat4(casData[0], casData[1], casData[2], casData[3]); // if (casIndex == 0) return mat4(casData[0], casData[1], casData[2], casData[3]);
// .. // ..
} }
vec3 shadowTestCascade(sampler2DShadow shadowMap, sampler2D shadowMapTransparent, const vec3 eye, const vec3 p, const float shadowsBias, const bool transparent) { vec3 shadowTestCascade(sampler2DShadow shadowMap,
#ifdef _ShadowMapTransparent
sampler2D shadowMapTransparent,
#endif
const vec3 eye, const vec3 p, const float shadowsBias
#ifdef _ShadowMapTransparent
, const bool transparent
#endif
) {
#ifdef _SMSizeUniform #ifdef _SMSizeUniform
vec2 smSize = smSizeUniform; vec2 smSize = smSizeUniform;
#else #else
@ -363,16 +364,22 @@ vec3 shadowTestCascade(sampler2DShadow shadowMap, sampler2D shadowMapTransparent
#endif #endif
const int c = shadowmapCascades; const int c = shadowmapCascades;
float d = distance(eye, p); float d = distance(eye, p);
int casi; int casi;
int casIndex; int casIndex;
mat4 LWVP = getCascadeMat(d, casi, casIndex); mat4 LWVP = getCascadeMat(d, casi, casIndex);
vec4 lPos = LWVP * vec4(p, 1.0); vec4 lPos = LWVP * vec4(p, 1.0);
lPos.xyz /= lPos.w; lPos.xyz /= lPos.w;
vec3 visibility = vec3(1.0); vec3 visibility = vec3(1.0);
if (lPos.w > 0.0) visibility = PCF(shadowMap, shadowMapTransparent, lPos.xy, lPos.z - shadowsBias, smSize, transparent); if (lPos.w > 0.0) visibility = PCF(shadowMap,
#ifdef _ShadowMapTransparent
shadowMapTransparent,
#endif
lPos.xy, lPos.z - shadowsBias, smSize
#ifdef _ShadowMapTransparent
, transparent
#endif
);
// Blend cascade // Blend cascade
// https://github.com/TheRealMJP/Shadows // https://github.com/TheRealMJP/Shadows
@ -391,13 +398,20 @@ vec3 shadowTestCascade(sampler2DShadow shadowMap, sampler2D shadowMapTransparent
vec4 lPos2 = LWVP2 * vec4(p, 1.0); vec4 lPos2 = LWVP2 * vec4(p, 1.0);
lPos2.xyz /= lPos2.w; lPos2.xyz /= lPos2.w;
vec3 visibility2 = vec3(1.0); vec3 visibility2 = vec3(1.0);
if (lPos2.w > 0.0) visibility2 = PCF(shadowMap, shadowMapTransparent, lPos2.xy, lPos2.z - shadowsBias, smSize, transparent); if (lPos2.w > 0.0) visibility2 = PCF(shadowMap,
#ifdef _ShadowMapTransparent
shadowMapTransparent,
#endif
lPos.xy, lPos.z - shadowsBias, smSize
#ifdef _ShadowMapTransparent
, transparent
#endif
);
float lerpAmt = smoothstep(0.0, blendThres, splitDist); float lerpAmt = smoothstep(0.0, blendThres, splitDist);
return mix(visibility2, visibility, lerpAmt); return mix(visibility2, visibility, lerpAmt);
} }
return visibility; return visibility;
// Visualize cascades // Visualize cascades
// if (ci == 0) albedo.rgb = vec3(1.0, 0.0, 0.0); // if (ci == 0) albedo.rgb = vec3(1.0, 0.0, 0.0);
// if (ci == 4) albedo.rgb = vec3(0.0, 1.0, 0.0); // if (ci == 4) albedo.rgb = vec3(0.0, 1.0, 0.0);