axmol/cocos2dx/CCConfiguration.cpp

/****************************************************************************
Copyright (c) 2010-2011 cocos2d-x.org
Copyright (c) 2010      Ricardo Quesada

http://www.cocos2d-x.org

Permission is hereby granted, free of charge, to any person obtaining a copy
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all copies or substantial portions of the Software.

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#include "CCConfiguration.h"
#include "ccMacros.h"
#include "ccConfig.h"

using namespace std;
namespace   cocos2d {

// singleton stuff
static bool g_bInited;
static CCConfiguration g_SharedConfiguration;
static char *g_pGlExtensions;

CCConfiguration::CCConfiguration(void)
: m_bSupportsBGRA8888(false)
, m_bSupportsDiscardFramebuffer(false)
, m_bSupportsNPOT(false)
, m_bSupportsPVRTC(false)
, m_nMaxModelviewStackDepth(0)
, m_nMaxSamplesAllowed(0)
, m_nMaxTextureSize(0)
, m_uOSVersion(0)
{
}

bool CCConfiguration::init(void)
{
	CCLOG("cocos2d: GL_VENDOR:     %s", glGetString(GL_VENDOR));
	CCLOG("cocos2d: GL_RENDERER:   %s", glGetString(GL_RENDERER));
	CCLOG("cocos2d: GL_VERSION:    %s", glGetString(GL_VERSION));

	g_pGlExtensions = (char *)glGetString(GL_EXTENSIONS);

	glGetIntegerv(GL_MAX_TEXTURE_SIZE, &m_nMaxTextureSize);
	glGetIntegerv(GL_MAX_MODELVIEW_STACK_DEPTH, &m_nMaxModelviewStackDepth);

	m_bSupportsPVRTC = checkForGLExtension("GL_IMG_texture_compression_pvrtc");
	m_bSupportsNPOT = checkForGLExtension("GL_APPLE_texture_2D_limited_npot");
	m_bSupportsBGRA8888 = checkForGLExtension("GL_IMG_texture_format_BGRA888");
	m_bSupportsDiscardFramebuffer = checkForGLExtension("GL_EXT_discard_framebuffer");

	CCLOG("cocos2d: GL_MAX_TEXTURE_SIZE: %d", m_nMaxTextureSize);
	CCLOG("cocos2d: GL_MAX_MODELVIEW_STACK_DEPTH: %d",m_nMaxModelviewStackDepth);
	CCLOG("cocos2d: GL supports PVRTC: %s", (m_bSupportsPVRTC ? "YES" : "NO"));
	CCLOG("cocos2d: GL supports BGRA8888 textures: %s", (m_bSupportsBGRA8888 ? "YES" : "NO"));
	CCLOG("cocos2d: GL supports NPOT textures: %s", (m_bSupportsNPOT ? "YES" : "NO"));
	CCLOG("cocos2d: GL supports discard_framebuffer: %s", (m_bSupportsDiscardFramebuffer ? "YES" : "NO"));
	
#if CC_TEXTURE_NPOT_SUPPORT
	CCLOG("cocos2d: compiled with NPOT support: %s", "YES");
#else
	CCLOG("cocos2d: compiled with NPOT support: %s", "NO");
#endif // CC_TEXTURE_NPOT_SUPPORT 

	
#if CC_TEXTURE_ATLAS_USES_VBO
	CCLOG("cocos2d: compiled with VBO support in TextureAtlas : %s", "YES");
#else
	CCLOG("cocos2d: compiled with VBO support in TextureAtlas : %s", "NO");
#endif // CC_TEXTURE_ATLAS_USES_VBO

	return true;

}

CCConfiguration* CCConfiguration::sharedConfiguration(void)
{
	if (! g_bInited)
	{
		g_SharedConfiguration.init();
	}

	return &g_SharedConfiguration;
}

bool CCConfiguration::checkForGLExtension(const string &searchName)
{
	bool bRet = false;
	const char *kSearchName = searchName.c_str();
	
	if (g_pGlExtensions && 
		strstr(g_pGlExtensions, kSearchName))
	{
		bRet = true;
	}
	
	return bRet;
}
}//namespace   cocos2d