| /* |
| * Copyright 2014 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #ifndef GrGLPathRendering_DEFINED |
| #define GrGLPathRendering_DEFINED |
| |
| #include "SkRefCnt.h" |
| #include "GrPathRendering.h" |
| #include "GrStencil.h" |
| #include "gl/GrGLFunctions.h" |
| #include "gl/GrGLProgram.h" |
| |
| class GrGLNameAllocator; |
| class GrGLGpu; |
| |
| /** |
| * This class wraps the NV_path_rendering extension and manages its various |
| * API versions. If a method is not present in the GrGLInterface of the GrGLGpu |
| * (because the driver version is old), it tries to provide a backup |
| * implementation. But if a backup implementation is not practical, it marks the |
| * method as not supported. |
| */ |
| class GrGLPathRendering : public GrPathRendering { |
| public: |
| /** |
| * Create a new GrGLPathRendering object from a given GrGLGpu. |
| */ |
| GrGLPathRendering(GrGLGpu* gpu); |
| virtual ~GrGLPathRendering(); |
| |
| // GrPathRendering implementations. |
| GrPath* createPath(const SkPath&, const GrStrokeInfo&) override; |
| virtual GrPathRange* createPathRange(GrPathRange::PathGenerator*, |
| const GrStrokeInfo&) override; |
| virtual GrPathRange* createGlyphs(const SkTypeface*, |
| const SkDescriptor*, |
| const GrStrokeInfo&) override; |
| void stencilPath(const GrPath*, const GrStencilSettings&) override; |
| void drawPath(const GrPath*, const GrStencilSettings&) override; |
| virtual void drawPaths(const GrPathRange*, const void* indices, PathIndexType, |
| const float transformValues[], PathTransformType, int count, |
| const GrStencilSettings&) override; |
| |
| /* Called when the 3D context state is unknown. */ |
| void resetContext(); |
| |
| /** |
| * Called when the GPU resources have been lost and need to be abandoned |
| * (for example after a context loss). |
| */ |
| void abandonGpuResources(); |
| |
| // Functions for "separable shader" texturing support. |
| void setProgramPathFragmentInputTransform(GrGLuint program, GrGLint location, |
| GrGLenum genMode, GrGLint components, |
| const SkMatrix&); |
| |
| /* Sets the projection matrix for path rendering */ |
| void setProjectionMatrix(const SkMatrix& matrix, |
| const SkISize& renderTargetSize, |
| GrSurfaceOrigin renderTargetOrigin); |
| |
| GrGLuint genPaths(GrGLsizei range); |
| GrGLvoid deletePaths(GrGLuint path, GrGLsizei range); |
| |
| private: |
| /** |
| * Mark certain functionality as not supported if the driver version is too |
| * old and a backup implementation is not practical. |
| */ |
| struct Caps { |
| bool stencilThenCoverSupport : 1; |
| bool fragmentInputGenSupport : 1; |
| bool glyphLoadingSupport : 1; |
| }; |
| const Caps& caps() const { return fCaps; } |
| |
| void flushPathStencilSettings(const GrStencilSettings&); |
| |
| // NV_path_rendering v1.2 |
| void stencilThenCoverFillPath(GrGLuint path, GrGLenum fillMode, |
| GrGLuint mask, GrGLenum coverMode); |
| |
| void stencilThenCoverStrokePath(GrGLuint path, GrGLint reference, |
| GrGLuint mask, GrGLenum coverMode); |
| |
| void stencilThenCoverFillPathInstanced( |
| GrGLsizei numPaths, GrGLenum pathNameType, const GrGLvoid *paths, |
| GrGLuint pathBase, GrGLenum fillMode, GrGLuint mask, GrGLenum coverMode, |
| GrGLenum transformType, const GrGLfloat *transformValues); |
| |
| void stencilThenCoverStrokePathInstanced( |
| GrGLsizei numPaths, GrGLenum pathNameType, const GrGLvoid *paths, |
| GrGLuint pathBase, GrGLint reference, GrGLuint mask, GrGLenum coverMode, |
| GrGLenum transformType, const GrGLfloat *transformValues); |
| |
| struct MatrixState { |
| SkMatrix fViewMatrix; |
| SkISize fRenderTargetSize; |
| GrSurfaceOrigin fRenderTargetOrigin; |
| |
| MatrixState() { this->invalidate(); } |
| void invalidate() { |
| fViewMatrix = SkMatrix::InvalidMatrix(); |
| fRenderTargetSize.fWidth = -1; |
| fRenderTargetSize.fHeight = -1; |
| fRenderTargetOrigin = (GrSurfaceOrigin) -1; |
| } |
| |
| /** |
| * Gets a matrix that goes from local coordinates to GL normalized device coords. |
| */ |
| template<int Size> void getRTAdjustedGLMatrix(GrGLfloat* destMatrix) { |
| SkMatrix combined; |
| if (kBottomLeft_GrSurfaceOrigin == fRenderTargetOrigin) { |
| combined.setAll(SkIntToScalar(2) / fRenderTargetSize.fWidth, 0, -SK_Scalar1, |
| 0, -SkIntToScalar(2) / fRenderTargetSize.fHeight, SK_Scalar1, |
| 0, 0, 1); |
| } else { |
| combined.setAll(SkIntToScalar(2) / fRenderTargetSize.fWidth, 0, -SK_Scalar1, |
| 0, SkIntToScalar(2) / fRenderTargetSize.fHeight, -SK_Scalar1, |
| 0, 0, 1); |
| } |
| combined.preConcat(fViewMatrix); |
| GrGLGetMatrix<Size>(destMatrix, combined); |
| } |
| }; |
| |
| GrGLGpu* fGpu; |
| SkAutoTDelete<GrGLNameAllocator> fPathNameAllocator; |
| Caps fCaps; |
| MatrixState fHWProjectionMatrixState; |
| GrStencilSettings fHWPathStencilSettings; |
| struct PathTexGenData { |
| GrGLenum fMode; |
| GrGLint fNumComponents; |
| GrGLfloat fCoefficients[3 * 3]; |
| }; |
| }; |
| |
| #endif |