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Much better face normal reconstruction

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This commit is contained in:
Olivier Prat 2018-09-20 15:34:28 +02:00
parent 64b72e3538
commit 1c2da13309
3 changed files with 32 additions and 4 deletions
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26
libraries/render-utils/src/ssao.slh
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@ -243,6 +243,32 @@ vec4 fetchTap(ivec4 side, vec2 tapSidePixelPos, float tapRadius, vec2 sideImageS
return P;
}
vec3 buildPosition(ivec4 side, vec2 fragUVPos, ivec2 depthTexFragPixelPos, ivec2 deltaDepthTexPixel, vec2 uvScale) {
depthTexFragPixelPos += deltaDepthTexPixel;
fragUVPos += deltaDepthTexPixel * uvScale;
float Zeye = getZEyeAtPixel(depthTexFragPixelPos, 0);
return evalEyePositionFromZeye(side.x, Zeye, fragUVPos);
}
vec3 getMinDiff(vec3 centralPoint, vec3 offsetPoint0, vec3 offsetPoint1) {
vec3 delta0 = offsetPoint0 - centralPoint;
vec3 delta1 = centralPoint - offsetPoint1;
return dot(delta0, delta0) < dot(delta1, delta1) ? delta0 : delta1;
}
vec3 buildNormal(ivec4 side, vec2 fragUVPos, ivec2 depthTexFragPixelPos, vec3 fragPositionES, ivec2 depthTextureScale, vec2 sideImageSize) {
vec2 uvScale = vec2(1.0) / (sideImageSize * depthTextureScale);
vec3 fragPositionDxPos = buildPosition(side, fragUVPos, depthTexFragPixelPos, ivec2(1,0), uvScale);
vec3 fragPositionDxNeg = buildPosition(side, fragUVPos, depthTexFragPixelPos, ivec2(-1,0), uvScale);
vec3 fragPositionDyPos = buildPosition(side, fragUVPos, depthTexFragPixelPos, ivec2(0,1), uvScale);
vec3 fragPositionDyNeg = buildPosition(side, fragUVPos, depthTexFragPixelPos, ivec2(0,-1), uvScale);
vec3 fragPositionDx = getMinDiff(fragPositionES, fragPositionDxPos, fragPositionDxNeg);
vec3 fragPositionDy = getMinDiff(fragPositionES, fragPositionDyPos, fragPositionDyNeg);
return normalize( cross(fragPositionDx, fragPositionDy) );
}
<@endfunc@>

5
libraries/render-utils/src/ssao_buildNormals.slf
View file

@ -26,7 +26,8 @@ void main(void) {
ivec2 fragPixelPos = ivec2(fragCoord.xy);
// Fetch the z under the pixel (stereo or not)
ivec2 depthTexFragPixelPos = fragPixelPos * getDepthTextureSize(0) / renderSize ;
ivec2 depthTextureScale = getDepthTextureSize(0) / renderSize;
ivec2 depthTexFragPixelPos = fragPixelPos * depthTextureScale;
float Zeye = getZEyeAtPixel(depthTexFragPixelPos, 0);
// Stereo side info
@ -38,7 +39,7 @@ void main(void) {
// The position and normal of the pixel fragment in Eye space
vec3 fragPositionES = evalEyePositionFromZeye(side.x, Zeye, fragUVPos);
vec3 fragNormalES = evalEyeNormal(fragPositionES);
vec3 fragNormalES = buildNormal(side, fragUVPos, depthTexFragPixelPos, fragPositionES, depthTextureScale, sideImageSize);
vec3 absFragNormalES = abs(fragNormalES);
outFragColor = vec4(vec3(fragNormalES)*0.5 + vec3(0.5), 1.0);

5
libraries/render-utils/src/ssao_makeOcclusion.slf
View file

@ -36,7 +36,8 @@ void main(void) {
#endif
// Fetch the z under the pixel (stereo or not)
ivec2 depthTexFragPixelPos = fragPixelPos * getDepthTextureSize(0) / renderSize ;
ivec2 depthTextureScale = getDepthTextureSize(0) / renderSize;
ivec2 depthTexFragPixelPos = fragPixelPos * depthTextureScale;
float Zeye = getZEyeAtPixel(depthTexFragPixelPos, 0);
#if SSAO_USE_QUAD_SPLIT
vec3 fragNormalES = getNormalEyeAtPixel(fragPixelPos, 0);
@ -52,7 +53,7 @@ void main(void) {
// The position and normal of the pixel fragment in Eye space
vec3 fragPositionES = evalEyePositionFromZeye(side.x, Zeye, fragUVPos);
#if !SSAO_USE_QUAD_SPLIT
vec3 fragNormalES = evalEyeNormal(fragPositionES);
vec3 fragNormalES = buildNormal(side, fragUVPos, depthTexFragPixelPos, fragPositionES, depthTextureScale, sideImageSize);
#endif
// Choose the screen-space sample radius