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added point light attenuations to raster

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BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2298603004

Review-Url: https://codereview.chromium.org/2298603004
This commit is contained in:
vjiaoblack 2016-08-31 11:48:29 -07:00 committed by Commit bot
parent bb106060fa
commit bcdc405ea0
1 changed files with 21 additions and 2 deletions
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23
src/core/SkShadowShader.cpp
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@ -699,8 +699,9 @@ void SkShadowShaderImpl::ShadowShaderContext::shadeSpan(int x, int y,
for (int l = 0; l < lightShader.fLights->numLights(); ++l) {
const SkLights::Light& light = lightShader.fLights->light(l);
int pvDepth = SkColorGetB(povDepthColor); // depth stored in blue channel
if (light.type() == SkLights::Light::kDirectional_LightType) {
int pvDepth = SkColorGetB(povDepthColor); // depth stored in blue channel
int xOffset = SkScalarRoundToInt(light.dir().fX * pvDepth);
int yOffset = SkScalarRoundToInt(light.dir().fY * pvDepth);
@ -745,8 +746,26 @@ void SkShadowShaderImpl::ShadowShaderContext::shadeSpan(int x, int y,
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();
// right now we only expect directional and point light types.
SkASSERT(light.type() == SkLights::Light::kPoint_LightType);
int height = lightShader.fDiffuseHeight;
SkVector3 fragToLight = SkVector3::Make(light.pos().fX - x - i,
light.pos().fY - (height - y),
light.pos().fZ - pvDepth);
SkScalar dist = fragToLight.length();
SkScalar normalizedZ = fragToLight.fZ / dist;
SkScalar distAttenuation = light.intensity() / (1.0f + dist * dist);
// assume object normals are pointing straight up
totalLight.fX += normalizedZ * light.color().fX * distAttenuation;
totalLight.fY += normalizedZ * light.color().fY * distAttenuation;
totalLight.fZ += normalizedZ * light.color().fZ * distAttenuation;
}
}