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Automatic shadow bias computation from cascade texel density

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This commit is contained in:
Olivier Prat 2017-12-06 11:22:15 +01:00
parent f9641afcd0
commit ff39558d27
1 changed files with 8 additions and 1 deletions
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9
libraries/render-utils/src/LightStage.cpp
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@ -23,6 +23,8 @@ const glm::mat4 LightStage::Shadow::_biasMatrix{
0.5, 0.5, 0.5, 1.0 };
const int LightStage::Shadow::MAP_SIZE = 1024;
static const auto MAX_BIAS = 0.006f;
const LightStage::Index LightStage::INVALID_INDEX { render::indexed_container::INVALID_INDEX };
LightStage::LightStage() {
@ -30,7 +32,7 @@ LightStage::LightStage() {
LightStage::Shadow::Schema::Schema() {
ShadowTransform defaultTransform;
defaultTransform.bias = 0.005f;
defaultTransform.bias = MAX_BIAS;
std::fill(cascades, cascades + SHADOW_CASCADE_MAX_COUNT, defaultTransform);
invMapSize = 1.0f / MAP_SIZE;
cascadeCount = 1;
@ -225,6 +227,11 @@ void LightStage::Shadow::setKeylightFrustum(unsigned int cascadeIndex, const Vie
// Update the buffer
auto& schema = _schemaBuffer.edit<Schema>();
schema.cascades[cascadeIndex].reprojection = _biasMatrix * ortho * shadowViewInverse.getMatrix();
// Adapt shadow bias to shadow resolution with a totally empirical formula
const auto maxShadowFrustumDim = std::max(fabsf(min.x - max.x), fabsf(min.y - max.y));
const auto REFERENCE_TEXEL_DENSITY = 20.0f;
const auto cascadeTexelDensity = MAP_SIZE / maxShadowFrustumDim;
schema.cascades[cascadeIndex].bias = MAX_BIAS * std::min(1.0f, REFERENCE_TEXEL_DENSITY / cascadeTexelDensity);
}
void LightStage::Shadow::setFrustum(unsigned int cascadeIndex, const ViewFrustum& shadowFrustum) {