Example #1
0
/*!***************************************************************************
@Function		GenerateBackgroundTexture
@Input			uiScreenWidth
@Input			uiScreenHeight
@Description	Generates a simple background texture procedurally.
*****************************************************************************/
void OGLES2IntroducingPrint3D::GenerateBackgroundTexture(unsigned int uiScreenWidth, unsigned int uiScreenHeight)
{
	// Generate star texture
	unsigned int uiStarW = PVRTGetPOTHigher(uiScreenWidth, 1);
	unsigned int uiStarH = PVRTGetPOTHigher(uiScreenHeight, 1);

	glGenTextures(1, &m_uiStarTex);
	glBindTexture(GL_TEXTURE_2D, m_uiStarTex);
	PVRTuint8* pTexData = new PVRTuint8[uiStarW*uiStarH];
	memset(pTexData, 0, uiStarW*uiStarH);
	for (unsigned int uiY = 0; uiY < uiStarH; uiY++)
	{
		for (unsigned int uiX = 0; uiX < uiStarW; uiX++)
		{
			unsigned int uiIdx = (uiY*uiStarW+uiX);
			if(rand() % 200 == 1)
			{
				pTexData[uiIdx] = rand() % 255;
			}
		}
	}
	glTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE, uiStarW, uiStarH, 0, GL_LUMINANCE, GL_UNSIGNED_BYTE, pTexData);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
	delete [] pTexData;

	bool bRotate = PVRShellGet(prefIsRotated) && PVRShellGet(prefFullScreen);
	m_BG.Init(NULL, bRotate, NULL);
}
Example #2
0
// NOTE: This function should be optimised
unsigned int PVRTGetPOTLower(unsigned int uiOriginalValue, int iTimesLower)
{
	if(uiOriginalValue == 0 || iTimesLower < 0)
	{
		return 0;
	}
	unsigned int uiSize = PVRTGetPOTHigher(uiOriginalValue,1);
	uiSize >>= 1;//uiSize /=2;

	for(int i = 1; i < iTimesLower; ++i)
	{
		uiSize >>= 1;//uiSize /=2;
		if(uiSize == 1)
		{
			// Lowest possible value has been reached, so break
			break;
		}
	}
	return uiSize;
}