Make GrGLShaderBuilder check whether GrEffect advertised that it would require the dst color or fragment position
R=senorblanco@chromium.org, robertphillips@google.com
Author: bsalomon@google.com
Review URL: https://chromiumcodereview.appspot.com/14998007
git-svn-id: http://skia.googlecode.com/svn/trunk@9074 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/effects/SkLightingImageFilter.cpp b/src/effects/SkLightingImageFilter.cpp
index bb2927b..c86bf6b 100644
--- a/src/effects/SkLightingImageFilter.cpp
+++ b/src/effects/SkLightingImageFilter.cpp
@@ -447,6 +447,7 @@
virtual ~GrGLDistantLight() {}
virtual void setData(const GrGLUniformManager&, const SkLight* light) const SK_OVERRIDE;
virtual void emitSurfaceToLight(GrGLShaderBuilder*, const char* z) SK_OVERRIDE;
+
private:
typedef GrGLLight INHERITED;
UniformHandle fDirectionUni;
@@ -459,6 +460,7 @@
virtual ~GrGLPointLight() {}
virtual void setData(const GrGLUniformManager&, const SkLight* light) const SK_OVERRIDE;
virtual void emitSurfaceToLight(GrGLShaderBuilder*, const char* z) SK_OVERRIDE;
+
private:
typedef GrGLLight INHERITED;
SkPoint3 fLocation;
@@ -473,6 +475,7 @@
virtual void setData(const GrGLUniformManager&, const SkLight* light) const SK_OVERRIDE;
virtual void emitSurfaceToLight(GrGLShaderBuilder*, const char* z) SK_OVERRIDE;
virtual void emitLightColor(GrGLShaderBuilder*, const char *surfaceToLight) SK_OVERRIDE;
+
private:
typedef GrGLLight INHERITED;
@@ -509,6 +512,8 @@
virtual bool isEqual(const SkLight& other) const {
return fColor == other.fColor;
}
+ // Called to know whether the generated GrGLLight will require access to the fragment position.
+ virtual bool requiresFragmentPosition() const = 0;
protected:
SkLight(SkColor color)
@@ -553,6 +558,8 @@
return NULL;
#endif
}
+ virtual bool requiresFragmentPosition() const SK_OVERRIDE { return false; }
+
virtual bool isEqual(const SkLight& other) const SK_OVERRIDE {
if (other.type() != kDistant_LightType) {
return false;
@@ -604,6 +611,7 @@
return NULL;
#endif
}
+ virtual bool requiresFragmentPosition() const SK_OVERRIDE { return true; }
virtual bool isEqual(const SkLight& other) const SK_OVERRIDE {
if (other.type() != kPoint_LightType) {
return false;
@@ -674,6 +682,7 @@
return NULL;
#endif
}
+ virtual bool requiresFragmentPosition() const SK_OVERRIDE { return true; }
virtual LightType type() const { return kSpot_LightType; }
const SkPoint3& location() const { return fLocation; }
const SkPoint3& target() const { return fTarget; }
@@ -1044,6 +1053,9 @@
, fLight(light)
, fSurfaceScale(surfaceScale) {
fLight->ref();
+ if (light->requiresFragmentPosition()) {
+ this->setWillReadFragmentPosition();
+ }
}
GrLightingEffect::~GrLightingEffect() {