diff options
Diffstat (limited to 'src/gpu/gl/builders/GrGLFragmentShaderBuilder.h')
-rw-r--r-- | src/gpu/gl/builders/GrGLFragmentShaderBuilder.h | 81 |
1 files changed, 57 insertions, 24 deletions
diff --git a/src/gpu/gl/builders/GrGLFragmentShaderBuilder.h b/src/gpu/gl/builders/GrGLFragmentShaderBuilder.h index b3e0ab0405..38d569e734 100644 --- a/src/gpu/gl/builders/GrGLFragmentShaderBuilder.h +++ b/src/gpu/gl/builders/GrGLFragmentShaderBuilder.h @@ -11,27 +11,14 @@ class GrGLProgramBuilder; -class GrGLFragmentShaderBuilder : public GrGLShaderBuilder { +/* + * This base class encapsulates the functionality which all GrProcessors are allowed to use in their + * fragment shader + */ +class GrGLProcessorFragmentShaderBuilder : public GrGLShaderBuilder { public: - typedef uint8_t DstReadKey; - typedef uint8_t FragPosKey; - - /** Returns a key for adding code to read the copy-of-dst color in service of effects that - require reading the dst. It must not return 0 because 0 indicates that there is no dst - copy read at all (in which case this function should not be called). */ - static DstReadKey KeyForDstRead(const GrTexture* dstCopy, const GrGLCaps&); - - /** Returns a key for reading the fragment location. This should only be called if there is an - effect that will requires the fragment position. If the fragment position is not required, - the key is 0. */ - static FragPosKey KeyForFragmentPosition(const GrRenderTarget* dst, const GrGLCaps&); - - GrGLFragmentShaderBuilder(GrGLProgramBuilder* program, const GrGLProgramDesc& desc); - - /** Returns the variable name that holds the color of the destination pixel. This may be NULL if - no effect advertised that it will read the destination. */ - const char* dstColor(); - + GrGLProcessorFragmentShaderBuilder(GrGLProgramBuilder* program) : INHERITED(program) {} + virtual ~GrGLProcessorFragmentShaderBuilder() {} /** * Use of these features may require a GLSL extension to be enabled. Shaders may not compile * if code is added that uses one of these features without calling enableFeature() @@ -45,19 +32,65 @@ public: * If the feature is supported then true is returned and any necessary #extension declarations * are added to the shaders. If the feature is not supported then false will be returned. */ - bool enableFeature(GLSLFeature); + virtual bool enableFeature(GLSLFeature) = 0; /** * This returns a variable name to access the 2D, perspective correct version of the coords in * the fragment shader. If the coordinates at index are 3-dimensional, it immediately emits a * perspective divide into the fragment shader (xy / z) to convert them to 2D. */ - SkString ensureFSCoords2D(const TransformedCoordsArray& coords, int index); + virtual SkString ensureFSCoords2D(const GrGLProcessor::TransformedCoordsArray& coords, + int index) = 0; /** Returns a variable name that represents the position of the fragment in the FS. The position is in device space (e.g. 0,0 is the top left and pixel centers are at half-integers). */ - const char* fragmentPosition(); + virtual const char* fragmentPosition() = 0; + +private: + typedef GrGLShaderBuilder INHERITED; +}; + +/* + * Fragment processor's, in addition to all of the above, may need to use dst color so they use + * this builder to create their shader + */ +class GrGLFragmentProcessorShaderBuilder : public GrGLProcessorFragmentShaderBuilder { +public: + GrGLFragmentProcessorShaderBuilder(GrGLProgramBuilder* program) : INHERITED(program) {} + /** Returns the variable name that holds the color of the destination pixel. This may be NULL if + no effect advertised that it will read the destination. */ + virtual const char* dstColor() = 0; + +private: + typedef GrGLProcessorFragmentShaderBuilder INHERITED; +}; + +class GrGLFragmentShaderBuilder : public GrGLFragmentProcessorShaderBuilder { +public: + typedef uint8_t DstReadKey; + typedef uint8_t FragPosKey; + + /** Returns a key for adding code to read the copy-of-dst color in service of effects that + require reading the dst. It must not return 0 because 0 indicates that there is no dst + copy read at all (in which case this function should not be called). */ + static DstReadKey KeyForDstRead(const GrTexture* dstCopy, const GrGLCaps&); + + /** Returns a key for reading the fragment location. This should only be called if there is an + effect that will requires the fragment position. If the fragment position is not required, + the key is 0. */ + static FragPosKey KeyForFragmentPosition(const GrRenderTarget* dst, const GrGLCaps&); + + GrGLFragmentShaderBuilder(GrGLProgramBuilder* program, const GrGLProgramDesc& desc); + + virtual const char* dstColor() SK_OVERRIDE; + + virtual bool enableFeature(GLSLFeature) SK_OVERRIDE; + + virtual SkString ensureFSCoords2D(const GrGLProcessor::TransformedCoordsArray& coords, + int index) SK_OVERRIDE; + + virtual const char* fragmentPosition() SK_OVERRIDE; private: /* @@ -113,7 +146,7 @@ private: friend class GrGLProgramBuilder; friend class GrGLFullProgramBuilder; - typedef GrGLShaderBuilder INHERITED; + typedef GrGLFragmentProcessorShaderBuilder INHERITED; }; #endif |