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feat(draw): extrapolate depth values using a tangent in the bilateral filter

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Improve the SSAO quality of surfaces seen from a grazing angle.
This commit is contained in:
yvt 2021-04-10 19:36:38 +09:00
parent e4e38d85c0
commit 4d71214d04
1 changed files with 17 additions and 3 deletions
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20
Resources/Shaders/PostFilters/BilateralFilter.fs
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@ -33,13 +33,19 @@ float decodeDepth(float w, float near, float far){
}
void main() {
float centerDepth = texture2D(depthTexture, texCoord).x;
if (centerDepth >= 0.999999) {
float centerDepthRaw = texture2D(depthTexture, texCoord).x;
// A tangent at `texCoord` in `depthTexture`
float centerDepthRawDfdx = dFdx(centerDepthRaw);
float centerDepthRawDfdy = dFdy(centerDepthRaw);
float centerDepthRawDfdi =
dot(vec2(centerDepthRawDfdx, centerDepthRawDfdy), unitShift / vec2(dFdx(texCoord.x), dFdy(texCoord.y)));
if (centerDepthRaw >= 0.999999) {
// skip background
gl_FragColor = vec4(1.0);
return;
}
centerDepth = decodeDepth(centerDepth, zNearFar.x, zNearFar.y);
vec2 sum = vec2(0.0000001);
if (isUpsampling) {
@ -47,6 +53,10 @@ void main() {
inputOriginCoord *= pixelShift.xy * 2.0;
for (float i = -4.0; i <= 4.0; i += 2.0) {
// Extrapolate the depth value using the tangent
float centerDepthRawInterpolated = centerDepthRaw + centerDepthRawDfdi * i;
float centerDepth = decodeDepth(centerDepthRawInterpolated, zNearFar.x, zNearFar.y);
vec2 sampledCoord = inputOriginCoord + unitShift * i;
float sampledDepth = texture2D(depthTexture, sampledCoord).x;
sampledDepth = decodeDepth(sampledDepth, zNearFar.x, zNearFar.y);
@ -61,6 +71,10 @@ void main() {
} else {
for (float i = -4.0; i <= 4.0; i += 1.0) {
// Extrapolate the depth value using the tangent
float centerDepthRawInterpolated = centerDepthRaw + centerDepthRawDfdi * i;
float centerDepth = decodeDepth(centerDepthRawInterpolated, zNearFar.x, zNearFar.y);
vec2 sampledCoord = texCoord + unitShift * i;
float sampledDepth = texture2D(depthTexture, sampledCoord).x;
sampledDepth = decodeDepth(sampledDepth, zNearFar.x, zNearFar.y);