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| 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(GrGLStandard forcedGpuAPI, 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(fGL); |
| 50 return fGL->hasExtension(extensionName); |
| 51 } |
| 52 |
| 53 /** |
| 54 * This notifies the context that we are deliberately testing abandoning |
| 55 * the context. It is useful for debugging contexts that would otherwise |
| 56 * test that GPU resources are properly deleted. It also allows a debugging |
| 57 * context to test that further GL calls are not made by Skia GPU code. |
| 58 */ |
| 59 void testAbandon(); |
| 60 |
| 61 protected: |
| 62 /** |
| 63 * Subclass implements this to make a GL context. The returned GrGLInterface |
| 64 * should be populated with functions compatible with the context. The |
| 65 * format and size of backbuffers does not matter since an FBO will be |
| 66 * created. |
| 67 */ |
| 68 virtual const GrGLInterface* createGLContext(GrGLStandard forcedGpuAPI) = 0; |
| 69 |
| 70 /** |
| 71 * Subclass should destroy the underlying GL context. |
| 72 */ |
| 73 virtual void destroyGLContext() = 0; |
| 74 |
| 75 private: |
| 76 GrGLuint fFBO; |
| 77 GrGLuint fColorBufferID; |
| 78 GrGLuint fDepthStencilBufferID; |
| 79 const GrGLInterface* fGL; |
| 80 |
| 81 typedef SkRefCnt INHERITED; |
| 82 }; |
| 83 |
| 84 /** |
| 85 * Helper macros for using the GL context through the GrGLInterface. Example: |
| 86 * SK_GL(glCtx, GenTextures(1, &texID)); |
| 87 */ |
| 88 #define SK_GL(ctx, X) (ctx).gl()->fFunctions.f ## X; \ |
| 89 SkASSERT(0 == (ctx).gl()->fFunctions.fGetError()) |
| 90 #define SK_GL_RET(ctx, RET, X) (RET) = (ctx).gl()->fFunctions.f ## X; \ |
| 91 SkASSERT(0 == (ctx).gl()->fFunctions.fGetError()) |
| 92 #define SK_GL_NOERRCHECK(ctx, X) (ctx).gl()->fFunctions.f ## X |
| 93 #define SK_GL_RET_NOERRCHECK(ctx, RET, X) (RET) = (ctx).gl()->fFunctions.f ## X |
| 94 |
| 95 #endif |
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