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Unified Diff: src/core/SkLightingShader.h

Issue 2043393002: Refactoring of GPU NormalMap handling out into its own class (Closed) Base URL: https://skia.googlesource.com/skia@master
Patch Set: Fixed SK_API flags, got rid of NormalMapSource::Make Created 4 years, 6 months ago
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Index: src/core/SkLightingShader.h
diff --git a/src/core/SkLightingShader.h b/src/core/SkLightingShader.h
index f25b30342a70699506cc03a5ffbc786e1e620207..c2b65472b924f35d5d757ca751d1aae6fdf0b9ed 100644
--- a/src/core/SkLightingShader.h
+++ b/src/core/SkLightingShader.h
@@ -16,6 +16,55 @@ class SkMatrix;
class SK_API SkLightingShader {
public:
+ /** Abstract class that generates or reads in normals for use by SkLightingShader. Currently
+ implements the GPU side only. Not to be used as part of the API yet. Used internally by
+ SkLightingShader.
+ */
+ class SK_API NormalSource : public SkFlattenable {
+ public:
+ virtual ~NormalSource();
+
+#if SK_SUPPORT_GPU
+ /** Returns a fragment processor that takes no input and outputs a normal (already rotated)
+ as its output color. To be used as a child fragment processor.
+ */
+ virtual sk_sp<GrFragmentProcessor> asFragmentProcessor(
+ GrContext* context,
+ const SkMatrix& viewM,
+ const SkMatrix* localMatrix,
+ SkFilterQuality filterQuality,
+ SkSourceGammaTreatment gammaTreatment) const = 0;
+#endif
+
+ /** Returns a normal source that provides normals sourced from the the normal map argument.
+ Not to be used as part of the API yet. Used internally by SkLightingShader.
+
+ @param normal the normal map
+ @param invNormRotation rotation applied to the normal map's normals
+ @param normLocalM the local matrix for the normal map
+
+ nullptr will be returned if
+ 'normal' is empty
+ 'normal' too big (> 65535 on either side)
+
+ The normal map is currently assumed to be an 8888 image where the normal at a texel
+ is retrieved by:
+ N.x = R-127;
+ N.y = G-127;
+ N.z = B-127;
+ N.normalize();
+ The +Z axis is thus encoded in RGB as (127, 127, 255) while the -Z axis is
+ (127, 127, 0).
+ */
+ static sk_sp<NormalSource> MakeMap(const SkBitmap& normal, const SkVector& invNormRotation,
+ const SkMatrix* normLocalM);
+
+ SK_DEFINE_FLATTENABLE_TYPE(NormalSource)
+ SK_DECLARE_FLATTENABLE_REGISTRAR_GROUP()
+ };
+
+
+
/** Returns a shader that lights the diffuse and normal maps with a set of lights.
It returns a shader with a reference count of 1.
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