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comparison: gfx/skia/trunk/include/gpu/gl/SkGLContextHelper.h
gfx/skia/trunk/include/gpu/gl/SkGLContextHelper.h
- branch
- TOR_BUG_9701
- changeset 9
- a63d609f5ebe
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| -1:000000000000 | 0:1d018c3dd6f6 |
|---|---|
| 1 | |
| 2 /* | |
| 3 * Copyright 2013 Google Inc. | |
| 4 * | |
| 5 * Use of this source code is governed by a BSD-style license that can be | |
| 6 * found in the LICENSE file. | |
| 7 */ | |
| 8 #ifndef SkGLContextHelper_DEFINED | |
| 9 #define SkGLContextHelper_DEFINED | |
| 10 | |
| 11 #include "GrGLInterface.h" | |
| 12 | |
| 13 /** | |
| 14 * Create an offscreen opengl context with an RGBA8 / 8bit stencil FBO. | |
| 15 * Provides a GrGLInterface struct of function pointers for the context. | |
| 16 */ | |
| 17 | |
| 18 class SK_API SkGLContextHelper : public SkRefCnt { | |
| 19 public: | |
| 20 SK_DECLARE_INST_COUNT(SkGLContextHelper) | |
| 21 | |
| 22 SkGLContextHelper(); | |
| 23 virtual ~SkGLContextHelper(); | |
| 24 | |
| 25 /** | |
| 26 * Initializes the context and makes it current. | |
| 27 */ | |
| 28 bool init(const int width, const int height); | |
| 29 | |
| 30 int getFBOID() const { return fFBO; } | |
| 31 | |
| 32 const GrGLInterface* gl() const { return fGL; } | |
| 33 | |
| 34 virtual void makeCurrent() const = 0; | |
| 35 | |
| 36 /** | |
| 37 * The primary purpose of this function it to provide a means of scheduling | |
| 38 * work on the GPU (since all of the subclasses create primary buffers for | |
| 39 * testing that are small and not meant to be rendered to the screen). | |
| 40 * | |
| 41 * If the drawing surface provided by the platform is double buffered this | |
| 42 * call will cause the platform to swap which buffer is currently being | |
| 43 * targeted. If the current surface does not include a back buffer, this | |
| 44 * call has no effect. | |
| 45 */ | |
| 46 virtual void swapBuffers() const = 0; | |
| 47 | |
| 48 bool hasExtension(const char* extensionName) const { | |
| 49 SkASSERT(NULL != fGL); | |
| 50 return fGL->hasExtension(extensionName); | |
| 51 } | |
| 52 | |
| 53 protected: | |
| 54 /** | |
| 55 * Subclass implements this to make a GL context. The returned GrGLInterface | |
| 56 * should be populated with functions compatible with the context. The | |
| 57 * format and size of backbuffers does not matter since an FBO will be | |
| 58 * created. | |
| 59 */ | |
| 60 virtual const GrGLInterface* createGLContext() = 0; | |
| 61 | |
| 62 /** | |
| 63 * Subclass should destroy the underlying GL context. | |
| 64 */ | |
| 65 virtual void destroyGLContext() = 0; | |
| 66 | |
| 67 private: | |
| 68 GrGLuint fFBO; | |
| 69 GrGLuint fColorBufferID; | |
| 70 GrGLuint fDepthStencilBufferID; | |
| 71 const GrGLInterface* fGL; | |
| 72 | |
| 73 typedef SkRefCnt INHERITED; | |
| 74 }; | |
| 75 | |
| 76 /** | |
| 77 * Helper macros for using the GL context through the GrGLInterface. Example: | |
| 78 * SK_GL(glCtx, GenTextures(1, &texID)); | |
| 79 */ | |
| 80 #define SK_GL(ctx, X) (ctx).gl()->fFunctions.f ## X; \ | |
| 81 SkASSERT(GR_GL_NO_ERROR == (ctx).gl()->fFunctions.fGetError()) | |
| 82 #define SK_GL_RET(ctx, RET, X) (RET) = (ctx).gl()->fFunctions.f ## X; \ | |
| 83 SkASSERT(GR_GL_NO_ERROR == (ctx).gl()->fFunctions.fGetError()) | |
| 84 #define SK_GL_NOERRCHECK(ctx, X) (ctx).gl()->fFunctions.f ## X | |
| 85 #define SK_GL_RET_NOERRCHECK(ctx, RET, X) (RET) = (ctx).gl()->fFunctions.f ## X | |
| 86 | |
| 87 #endif |
