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class CGlyphOGL{public://	CSprite m_Sprite;//	int m_nAdvance;	GLuint m_nTexture;	int m_nWidth;	int m_nHeight;	float m_fX1;	float m_fX2;	float m_fY1;	float m_fY2;};class CFontOGL: public CFont{public:	CFontOGL(CRendererOGL& iRenderer, const std::string& sName, int nSize);	virtual ~CFontOGL();	virtual void Draw(int nX, int nY, const std::string& sText);protected:	CRendererOGL& m_iRenderer;	CGlyphOGL m_vGlyphs[96];};int PowerOfTwo(int nX){	int nResult = 2;	while (nResult < nX)	{		nResult *= 2;	}	return nResult;}/*** OPEN GL FONT CODE ***/CFontOGL::CFontOGL(CRendererOGL& iRenderer, const std::string& sName, int nSize):	m_iRenderer(iRenderer){	TTF_Font* pFont;	SDL_Surface* pSurface;	SDL_Color color;	char szText[2];	unsigned char* bBuffer;	int nTexWidth;	int nTexHeight;	/* Open font */	pFont = TTF_OpenFont(sName.c_str(), nSize);	if (!pFont)	{		throw CSDLTTFError("TTF_OpenFont");	}	/* Draw 32-127 */	color.r = 255;	szText[1] = 0;	for (int i = 0; i < 96; i++)	{		CGlyphOGL& Glyph = m_vGlyphs[i];		/* Draw text to surface */		szText[0] = i + 32;		pSurface = TTF_RenderText_Solid(pFont, szText, color);		/* OpenGL texture dimensions must be 2^n */		nTexWidth = PowerOfTwo(pSurface->w);		nTexHeight = PowerOfTwo(pSurface->h);		/* Fill glyph struct */		Glyph.m_nWidth = pSurface->w;		Glyph.m_nHeight = pSurface->h;		Glyph.m_fX1 = 0.0f;		Glyph.m_fY1 = 0.0f;		Glyph.m_fX2 = static_cast<float> (Glyph.m_nWidth) / static_cast<float> (nTexWidth);		Glyph.m_fY2 = static_cast<float> (Glyph.m_nHeight) / static_cast<float> (nTexHeight);		/* Fill texture buffer */		bBuffer = new unsigned char[nTexWidth * nTexHeight];		for (int nX = 0; nX < pSurface->w; nX++)		{			for (int nY = 0; nY < pSurface->h; nY++)			{				/* o.o */				bBuffer[nY * nTexWidth + nX] =					pSurface->format->palette->colors[						static_cast<char*> (pSurface->pixels)[nY * pSurface->w + nX]					].r;			}		}		/* Generate the OpenGL texture */		glGenTextures(1, &Glyph.m_nTexture);		glBindTexture(GL_TEXTURE_2D, Glyph.m_nTexture);		glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA8, nTexWidth, nTexHeight, 0, GL_ALPHA, GL_UNSIGNED_BYTE, bBuffer);		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);		/* Free used buffers */		delete[] bBuffer;		SDL_FreeSurface(pSurface);	}	TTF_CloseFont(pFont);}CFontOGL::~CFontOGL(){}void CFontOGL::Draw(int nX, int nY, const std::string& sName){	glPushMatrix();	glEnable(GL_TEXTURE_2D);	glEnable(GL_BLEND);	glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);	glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);	glTranslated(nX, nY, 0);	glColor3f(1.0f, 1.0f, 1.0f);	int nSize = sName.size();	for (int i = 0; i < nSize; i++)	{		if (			(unsigned char) sName[i] >= 32 &&			(unsigned char) sName[i] <= 127		)		{			CGlyphOGL& Glyph = m_vGlyphs[sName[i] - 32];			glBindTexture(GL_TEXTURE_2D, Glyph.m_nTexture);			glBegin(GL_QUADS);				glTexCoord2f(Glyph.m_fX1, Glyph.m_fY1);				glVertex2i(0, 0);				glTexCoord2f(Glyph.m_fX2, Glyph.m_fY1);				glVertex2i(Glyph.m_nWidth, 0);				glTexCoord2f(Glyph.m_fX2, Glyph.m_fY2);				glVertex2i(Glyph.m_nWidth, Glyph.m_nHeight);				glTexCoord2f(Glyph.m_fX1, Glyph.m_fY2);				glVertex2i(0, Glyph.m_nHeight);			glEnd();			glTranslated(Glyph.m_nWidth, 0, 0);		}	}	glDisable(GL_TEXTURE_2D);	glDisable(GL_BLEND);	glPopMatrix();}