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/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkGLContext_DEFINED
#define SkGLContext_DEFINED
#include "GrGLInterface.h"
#include "SkString.h"
/**
* Create an offscreen opengl context with an RGBA8 / 8bit stencil FBO.
* Provides a GrGLInterface struct of function pointers for the context.
*/
class SkGLContext : public SkRefCnt {
public:
SkGLContext();
virtual ~SkGLContext();
/**
* 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;
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:
SkString fExtensionString;
GrGLuint fFBO;
const GrGLInterface* fGL;
};
/**
* Helper macro for using the GL context through the GrGLInterface. Example:
* SK_GL(glCtx, GenTextures(1, &texID));
*/
#define SK_GL(ctx, X) (ctx).gl()->f ## X
#endif
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