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//
// libavg - Media Playback Engine.
// Copyright (C) 2003-2014 Ulrich von Zadow
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
//
// Current versions can be found at www.libavg.de
//
#ifndef _GLContext_H_
#define _GLContext_H_
#include "../api.h"
#include "OGLHelper.h"
#include "GLBufferCache.h"
#include "GLConfig.h"
#include "../base/GLMHelper.h"
#include <boost/shared_ptr.hpp>
#include <boost/thread/tss.hpp>
struct SDL_SysWMinfo;
namespace avg {
class GLContext;
typedef boost::shared_ptr<GLContext> GLContextPtr;
class ShaderRegistry;
typedef boost::shared_ptr<ShaderRegistry> ShaderRegistryPtr;
class StandardShader;
typedef boost::shared_ptr<StandardShader> StandardShaderPtr;
class AVG_API GLContext
{
public:
static GLContext* create(const GLConfig& glConfig,
const IntPoint& windowSize=IntPoint(0,0), const SDL_SysWMinfo* pSDLWMInfo=0);
GLContext(const IntPoint& windowSize, const SDL_SysWMinfo* pSDLWMInfo);
virtual ~GLContext();
virtual void activate()=0;
ShaderRegistryPtr getShaderRegistry() const;
StandardShaderPtr getStandardShader();
bool useGPUYUVConversion() const;
GLConfig::ShaderUsage getShaderUsage() const;
// GL Object caching.
GLBufferCache& getVertexBufferCache();
GLBufferCache& getIndexBufferCache();
GLBufferCache& getPBOCache();
unsigned genFBO();
void returnFBOToCache(unsigned fboID);
// GL state cache.
void setBlendColor(const glm::vec4& color);
enum BlendMode {BLEND_BLEND, BLEND_ADD, BLEND_MIN, BLEND_MAX, BLEND_COPY};
void setBlendMode(BlendMode mode, bool bPremultipliedAlpha = false);
bool isBlendModeSupported(BlendMode mode) const;
void bindTexture(unsigned unit, unsigned texID);
const GLConfig& getConfig();
void logConfig();
size_t getVideoMemInstalled();
size_t getVideoMemUsed();
int getMaxTexSize();
bool usePOTTextures();
bool arePBOsSupported();
OGLMemoryMode getMemoryMode();
bool isGLES() const;
bool isVendor(const std::string& sWantedVendor) const;
virtual bool useDepthBuffer() const;
virtual bool initVBlank(int rate)=0;
virtual void swapBuffers();
static void enableErrorChecks(bool bEnable);
static void checkError(const char* pszWhere);
static void mandatoryCheckError(const char* pszWhere);
void ensureFullShaders(const std::string& sContext) const;
static BlendMode stringToBlendMode(const std::string& s);
static GLContext* getCurrent();
static GLContext* getMain();
static void setMain(GLContext * pMainContext);
static int nextMultiSampleValue(int curSamples);
static bool isGLESSupported();
static void enableErrorLog(bool bEnable);
protected:
void init(const GLConfig& glConfig, bool bOwnsContext);
void deleteObjects();
void getVersion(int& major, int& minor) const;
bool ownsContext() const;
void setCurrent();
private:
void checkGPUMemInfoSupport();
bool isDebugContextSupported() const;
static void APIENTRY debugLogCallback(GLenum source, GLenum type, GLuint id,
GLenum severity, GLsizei length, const GLchar* message, void* userParam);
bool m_bOwnsContext;
ShaderRegistryPtr m_pShaderRegistry;
StandardShaderPtr m_pStandardShader;
GLBufferCache m_VertexBufferCache;
GLBufferCache m_IndexBufferCache;
GLBufferCache m_PBOCache;
std::vector<unsigned int> m_FBOIDs;
int m_MaxTexSize;
GLConfig m_GLConfig;
bool m_bCheckedGPUMemInfoExtension;
bool m_bGPUMemInfoSupported;
bool m_bCheckedMemoryMode;
OGLMemoryMode m_MemoryMode;
// OpenGL state
glm::vec4 m_BlendColor;
BlendMode m_BlendMode;
bool m_bPremultipliedAlpha;
unsigned m_BoundTextures[16];
int m_MajorGLVersion;
int m_MinorGLVersion;
static bool s_bErrorCheckEnabled;
static bool s_bErrorLogEnabled;
static boost::thread_specific_ptr<GLContext*> s_pCurrentContext;
static GLContext* s_pMainContext;
};
}
#endif
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