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Small optimisations in shadow shader

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This commit is contained in:
Olivier Prat 2018-02-02 15:06:22 +01:00
parent 234cb1e3e6
commit e9747e9d85
4 changed files with 9 additions and 9 deletions
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4
libraries/render-utils/src/RenderShadowTask.cpp
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@ -380,8 +380,8 @@ void RenderShadowCascadeSetup::run(const render::RenderContextPointer& renderCon
auto& cascadeFrustum = cascade.getFrustum(); auto& cascadeFrustum = cascade.getFrustum();
args->pushViewFrustum(*cascadeFrustum); args->pushViewFrustum(*cascadeFrustum);
auto texelSize = glm::min(cascadeFrustum->getHeight(), cascadeFrustum->getWidth()) / cascade.framebuffer->getSize().x; auto texelSize = glm::min(cascadeFrustum->getHeight(), cascadeFrustum->getWidth()) / cascade.framebuffer->getSize().x;
// Set the cull threshold to 16 shadow texels. // Set the cull threshold to 24 shadow texels. This is totally arbitrary
const auto minTexelCount = 16.0f; const auto minTexelCount = 24.0f;
// TODO : maybe adapt that with LOD management system? // TODO : maybe adapt that with LOD management system?
texelSize *= minTexelCount; texelSize *= minTexelCount;
_cullFunctor._minSquareSize = texelSize * texelSize; _cullFunctor._minSquareSize = texelSize * texelSize;

8
libraries/render-utils/src/RenderShadowTask.h
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@ -82,12 +82,12 @@ public:
float constantBias0{ 0.15f }; float constantBias0{ 0.15f };
float constantBias1{ 0.15f }; float constantBias1{ 0.15f };
float constantBias2{ 0.15f }; float constantBias2{ 0.175f };
float constantBias3{ 0.15f }; float constantBias3{ 0.2f };
float slopeBias0{ 0.6f }; float slopeBias0{ 0.6f };
float slopeBias1{ 0.6f }; float slopeBias1{ 0.6f };
float slopeBias2{ 0.6f }; float slopeBias2{ 0.7f };
float slopeBias3{ 0.6f }; float slopeBias3{ 0.82f };
signals: signals:
void dirty(); void dirty();

2
libraries/render-utils/src/Shadow.slh
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@ -89,7 +89,7 @@ float evalShadowCascadeAttenuation(int cascadeIndex, ShadowSampleOffsets offsets
float evalShadowAttenuation(vec3 worldLightDir, vec4 worldPosition, float viewDepth, vec3 worldNormal) { float evalShadowAttenuation(vec3 worldLightDir, vec4 worldPosition, float viewDepth, vec3 worldNormal) {
ShadowSampleOffsets offsets = evalShadowFilterOffsets(worldPosition); ShadowSampleOffsets offsets = evalShadowFilterOffsets(worldPosition);
vec4 cascadeShadowCoords[2]; vec4 cascadeShadowCoords[2] = { vec4(0), vec4(0) };
ivec2 cascadeIndices; ivec2 cascadeIndices;
float cascadeMix = determineShadowCascadesOnPixel(worldPosition, viewDepth, cascadeShadowCoords, cascadeIndices); float cascadeMix = determineShadowCascadesOnPixel(worldPosition, viewDepth, cascadeShadowCoords, cascadeIndices);

4
libraries/render-utils/src/ShadowCore.slh
View file

@ -82,10 +82,10 @@ float evalShadowCascadeWeight(vec4 cascadeTexCoords) {
float determineShadowCascadesOnPixel(vec4 worldPosition, float viewDepth, out vec4 cascadeShadowCoords[2], out ivec2 cascadeIndices) { float determineShadowCascadesOnPixel(vec4 worldPosition, float viewDepth, out vec4 cascadeShadowCoords[2], out ivec2 cascadeIndices) {
cascadeIndices.x = getFirstShadowCascadeOnPixel(0, worldPosition, cascadeShadowCoords[0]); cascadeIndices.x = getFirstShadowCascadeOnPixel(0, worldPosition, cascadeShadowCoords[0]);
cascadeIndices.y = cascadeIndices.x+1; cascadeIndices.y = cascadeIndices.x+1;
if (cascadeIndices.x < (getShadowCascadeCount()-1)) { float firstCascadeWeight = evalShadowCascadeWeight(cascadeShadowCoords[0]);
if (firstCascadeWeight<1.0 && cascadeIndices.x < (getShadowCascadeCount()-1)) {
cascadeIndices.y = getFirstShadowCascadeOnPixel(cascadeIndices.y, worldPosition, cascadeShadowCoords[1]); cascadeIndices.y = getFirstShadowCascadeOnPixel(cascadeIndices.y, worldPosition, cascadeShadowCoords[1]);
float firstCascadeWeight = evalShadowCascadeWeight(cascadeShadowCoords[0]);
float secondCascadeWeight = evalShadowCascadeWeight(cascadeShadowCoords[1]); float secondCascadeWeight = evalShadowCascadeWeight(cascadeShadowCoords[1]);
// Returns the mix amount between first and second cascade. // Returns the mix amount between first and second cascade.
return ((1.0-firstCascadeWeight) * secondCascadeWeight) / (firstCascadeWeight + secondCascadeWeight); return ((1.0-firstCascadeWeight) * secondCascadeWeight) / (firstCascadeWeight + secondCascadeWeight);