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made raster shadows variance shadows

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BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2297693002

Review-Url: https://codereview.chromium.org/2297693002
This commit is contained in:
vjiaoblack 2016-08-30 12:03:37 -07:00 committed by Commit bot
parent 8e3f54d519
commit fdf2986b19
1 changed files with 23 additions and 5 deletions
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28
src/core/SkShadowShader.cpp
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@ -729,6 +729,7 @@ void SkShadowShaderImpl::ShadowShaderContext::shadeSpan(int x, int y,
int shY = SkClampMax(y + yOffset, light.getShadowMap()->height() - 1);
int shDepth = 0;
int shDepthsq = 0;
// pixmaps that point to things have nonzero heights
if (fShadowMapPixels[l].height() > 0) {
@ -736,17 +737,34 @@ void SkShadowShaderImpl::ShadowShaderContext::shadeSpan(int x, int y,
SkColor shColor(pix);
shDepth = SkColorGetB(shColor);
shDepthsq = SkColorGetG(shColor) * 256;
} else {
// Make lights w/o a shadow map receive the full light contribution
shDepth = pvDepth;
}
if (pvDepth >= shDepth) {
// assume object normals are pointing straight up
totalLight.fX += light.dir().fZ * light.color().fX;
totalLight.fY += light.dir().fZ * light.color().fY;
totalLight.fZ += light.dir().fZ * light.color().fZ;
SkScalar lightProb = 1.0f;
if (pvDepth < shDepth) {
if (lightShader.fShadowParams.fType ==
SkShadowParams::ShadowType::kVariance_ShadowType) {
int variance = SkMaxScalar(shDepthsq - shDepth * shDepth,
lightShader.fShadowParams.fMinVariance);
int d = pvDepth - shDepth;
lightProb = (SkScalar) variance / ((SkScalar) (variance + d * d));
SkScalar bias = lightShader.fShadowParams.fBiasingConstant;
lightProb = SkMaxScalar((lightProb - bias) / (1.0f - bias), 0.0f);
} else {
lightProb = 0.0f;
}
}
// assume object normals are pointing straight up
totalLight.fX += light.dir().fZ * light.color().fX * lightProb;
totalLight.fY += light.dir().fZ * light.color().fY * lightProb;
totalLight.fZ += light.dir().fZ * light.color().fZ * lightProb;
} else {
totalLight += light.color();
}