Function TextureMapInit

Samples/NiViewer/Draw.cpp:162–215

}

void TextureMapInit(XnTextureMap* pTex, int nSizeX, int nSizeY, unsigned int nBytesPerPixel, int nCurX, int nCurY)
{
	// check if something changed
	if (pTex->bInitialized && pTex->OrigSize.X == nSizeX && pTex->OrigSize.Y == nSizeY)
	{
		if (pTex->CurSize.X != nCurX || pTex->CurSize.Y != nCurY)
		{
			// clear map
			xnOSMemSet(pTex->pMap, 0, pTex->Size.X * pTex->Size.Y * pTex->nBytesPerPixel);

			// update
			pTex->CurSize.X = nCurX;
			pTex->CurSize.Y = nCurY;
			return;
		}
	}

	// free memory if it was allocated
	if (pTex->pMap != NULL)
		delete pTex->pMap;

	// update it all
	pTex->OrigSize.X = nSizeX;
	pTex->OrigSize.Y = nSizeY;
	pTex->Size.X = GetPowerOfTwo(nSizeX);
	pTex->Size.Y = GetPowerOfTwo(nSizeY);
	pTex->nBytesPerPixel = nBytesPerPixel;
	pTex->CurSize.X = nCurX;
	pTex->CurSize.Y = nCurY;
	pTex->pMap = new unsigned char[pTex->Size.X * pTex->Size.Y * nBytesPerPixel];
	xnOSMemSet(pTex->pMap, 0, pTex->Size.X * pTex->Size.Y * nBytesPerPixel);
	
	if (!pTex->bInitialized)
	{
		glGenTextures(1, &pTex->nID);
		glBindTexture(GL_TEXTURE_2D, pTex->nID);

		switch (pTex->nBytesPerPixel)
		{
		case 3:
			pTex->nFormat = GL_RGB;
			break;
		case 4:
			pTex->nFormat = GL_RGBA;
			break;
		}

		glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP_SGIS, GL_TRUE);
		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

		pTex->bInitialized = TRUE;
	}
}

inline unsigned char* TextureMapGetLine(XnTextureMap* pTex, unsigned int nLine)
{