| |
| /* |
| * Copyright 2013 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| #ifndef SkGLContextHelper_DEFINED |
| #define SkGLContextHelper_DEFINED |
| |
| #include "GrGLExtensions.h" |
| #include "GrGLInterface.h" |
| |
| /** |
| * Create an offscreen opengl context with an RGBA8 / 8bit stencil FBO. |
| * Provides a GrGLInterface struct of function pointers for the context. |
| */ |
| |
| class SkGLContextHelper : public SkRefCnt { |
| public: |
| SK_DECLARE_INST_COUNT(SkGLContextHelper) |
| |
| SkGLContextHelper(); |
| virtual ~SkGLContextHelper(); |
| |
| /** |
| * Initializes the context and makes it current. |
| */ |
| bool init(const int width, const int height); |
| |
| int getFBOID() const { return fFBO; } |
| |
| const GrGLInterface* gl() const { return fGL; } |
| |
| virtual void makeCurrent() const = 0; |
| |
| bool hasExtension(const char* extensionName) const { |
| SkASSERT(NULL != fGL); |
| return fExtensions.has(extensionName); |
| } |
| |
| protected: |
| /** |
| * Subclass implements this to make a GL context. The returned GrGLInterface |
| * should be populated with functions compatible with the context. The |
| * format and size of backbuffers does not matter since an FBO will be |
| * created. |
| */ |
| virtual const GrGLInterface* createGLContext() = 0; |
| |
| /** |
| * Subclass should destroy the underlying GL context. |
| */ |
| virtual void destroyGLContext() = 0; |
| |
| private: |
| GrGLExtensions fExtensions; |
| GrGLuint fFBO; |
| GrGLuint fColorBufferID; |
| GrGLuint fDepthStencilBufferID; |
| const GrGLInterface* fGL; |
| |
| typedef SkRefCnt INHERITED; |
| }; |
| |
| /** |
| * Helper macros for using the GL context through the GrGLInterface. Example: |
| * SK_GL(glCtx, GenTextures(1, &texID)); |
| */ |
| #define SK_GL(ctx, X) (ctx).gl()->f ## X; \ |
| SkASSERT(GR_GL_NO_ERROR == (ctx).gl()->fGetError()) |
| #define SK_GL_RET(ctx, RET, X) (RET) = (ctx).gl()->f ## X; \ |
| SkASSERT(GR_GL_NO_ERROR == (ctx).gl()->fGetError()) |
| #define SK_GL_NOERRCHECK(ctx, X) (ctx).gl()->f ## X |
| #define SK_GL_RET_NOERRCHECK(ctx, RET, X) (RET) = (ctx).gl()->f ## X |
| |
| #endif |