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Switched to world space dithering for more visual stability

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Olivier Prat 2017-11-13 13:54:51 +01:00
parent dd0eaafc0d
commit 6611b28e2d
2 changed files with 11 additions and 5 deletions
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2
libraries/render-utils/src/LightStage.cpp
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@ -13,6 +13,8 @@
#include "LightStage.h"
#include <cmath>
std::string LightStage::_stageName { "LIGHT_STAGE"};
const glm::mat4 LightStage::Shadow::_biasMatrix{
0.5, 0.0, 0.0, 0.0,

14
libraries/render-utils/src/Shadow.slh
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@ -62,18 +62,22 @@ float evalShadowNoise(vec4 seed) {
return fract(sin(dot_product) * 43758.5453);
}
float evalShadowAttenuationPCF(vec4 shadowTexcoord) {
float evalShadowAttenuationPCF(vec4 position, vec4 shadowTexcoord) {
float shadowScale = getShadowScale();
#if 0
// Pattern dithering in screen space
// Offset for efficient PCF, see http://http.developer.nvidia.com/GPUGems/gpugems_ch11.html
ivec2 coords = ivec2(gl_FragCoord.xy);
#if 1
#else
// Pattern dithering in world space (mm resolution)
ivec2 coords = ivec2(position.x, position.y+position.z);
#endif
// Add some noise to break dithering
int index = int(4.0*evalShadowNoise(gl_FragCoord.xyyx))%4;
coords.x += index & 1;
coords.y += (index & 2) >> 1;
#endif
// Offset for efficient PCF, see http://http.developer.nvidia.com/GPUGems/gpugems_ch11.html
ivec2 offset = coords & ivec2(1,1);
offset.y = (offset.x+offset.y) & 1;
vec2 offsetF = vec2(offset);
@ -97,7 +101,7 @@ float evalShadowAttenuation(vec4 position) {
return 1.0;
}
return evalShadowAttenuationPCF(shadowTexcoord);
return evalShadowAttenuationPCF(position, shadowTexcoord);
}
<@endif@>