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cascade loop, fine tune calc

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raveenajain 2019-06-27 09:41:39 -07:00
parent 534794d7ff
commit 04afbde188
1 changed files with 12 additions and 34 deletions
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46
libraries/render-utils/src/RenderShadowTask.cpp
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@ -366,11 +366,9 @@ void RenderShadowSetup::configure(const Config& configuration) {
void RenderShadowSetup::calculateBiases() {
// slope scaling values derived from ratio between original constantBias and slopeBias pairs
float SCALE_SLOPE_0 = 2.7f;
float SCALE_SLOPE_1 = 3.0f;
float SCALE_SLOPE_2 = 3.7f;
float SCALE_SLOPE_3 = 3.5f;
float CONVERT_BIAS = 100.0f;
const std::vector<float> SLOPE_SCALES = {2.7f, 3.0f, 3.7f, 3.5f};
const float CONVERT_BIAS = 100.0f;
const float MIN_SCALE_DIVISOR = 0.5f;
// the bias is relative to resolution
// to remain consistent with the constant and slope bias values, the biasInput
@ -378,44 +376,24 @@ void RenderShadowSetup::calculateBiases() {
float inverseResolution = 1.0f / (float)resolution;
int resolutionScale = DEFAULT_RESOLUTION * inverseResolution;
float convertedBias = _biasInput * (CONVERT_BIAS / resolutionScale);
std::vector<float> localConstants = std::vector<float>(4);
std::vector<float> localSlopes = std::vector<float>(4);
float scaleFactor = 1.0f;
scaleFactor = convertedBias * (cacasdeDistances[0] / glm::clamp(cacasdeDistances[5], 0.0001f, FLT_MAX)) * inverseResolution;
float localConstant0 = cacasdeDistances[1] * scaleFactor;
float localConstant1 = cacasdeDistances[1] * scaleFactor;
float localSlope0 = cacasdeDistances[1] * scaleFactor * SCALE_SLOPE_0;
float localSlope1 = cacasdeDistances[1] * scaleFactor * SCALE_SLOPE_1;
scaleFactor = convertedBias * (cacasdeDistances[0] / glm::clamp(cacasdeDistances[6], 0.0001f, FLT_MAX)) * inverseResolution;
float localConstant2 = cacasdeDistances[2] * scaleFactor;
float localSlope2 = cacasdeDistances[2] * scaleFactor * SCALE_SLOPE_2;
scaleFactor = convertedBias * (cacasdeDistances[0] / glm::clamp(cacasdeDistances[7], 0.0001f, FLT_MAX)) * inverseResolution;
float localConstant3 = cacasdeDistances[3] * scaleFactor;
float localSlope3 = cacasdeDistances[3] * scaleFactor * SCALE_SLOPE_3;
setConstantBias(0, localConstant0);
setSlopeBias(0, localSlope0);
#if SHADOW_CASCADE_MAX_COUNT > 1
setConstantBias(1, localConstant1);
setConstantBias(2, localConstant2);
setConstantBias(3, localConstant3);
setSlopeBias(1, localSlope1);
setSlopeBias(2, localSlope2);
setSlopeBias(3, localSlope3);
#endif
for (int i = 0; i < SHADOW_CASCADE_MAX_COUNT; i++) {
scaleFactor = convertedBias * (cacasdeDistances[0] / glm::max(MIN_SCALE_DIVISOR, cacasdeDistances[i + 4])) * inverseResolution;
localConstants[i] = cacasdeDistances[i] * scaleFactor;
localSlopes[i] = cacasdeDistances[i] * scaleFactor * SLOPE_SCALES[i];
setConstantBias(i, localConstants[i]);
setSlopeBias(i, localSlopes[i]);
}
}
// clamp constant and slope at 1 to prevent peter panning
void RenderShadowSetup::setConstantBias(int cascadeIndex, float value) {
value = glm::clamp(value, 0.0f, 1.0f);
_bias[cascadeIndex]._constant = value * value * value * 0.004f;
}
void RenderShadowSetup::setSlopeBias(int cascadeIndex, float value) {
value = glm::clamp(value, 0.0f, 1.0f);
_bias[cascadeIndex]._slope = value * value * value * 0.001f;
}