I have an array of unsigned ints which hold data for a picture. I know the origional data is correct and actually contains the image. When I create a texture out of it and then try to re-obtain the data from the texture to put it back into an unsigned int array via:
glTexImage2D( GL_TEXTURE_2D, 0, 3, BLOCK_WIDTH, BLOCK_HEIGHT,
0, GL_RGB, GL_UNSIGNED_BYTE, pTexture );
The left half of the image is black. Its 256x256. Any idea of why its only getting the right side of the picture?
Heres some more detailed code for your viewing pleasure:
CREATING THE TEXTURE FROM THE DATA
//-----------------------------------------------------------------------------
// Name: CreateLightmap()
// Desc:
//-----------------------------------------------------------------------------
bool CLightmapManager::CreateLightmap( const unsigned char* pData, const int iIndex )
{
TRACE_ENTER_FN( CLightmapManager::CreateLightmap )
// Free whatever may be in use
if( !ReleaseLightmap( iIndex ) ) LOG_ERR_RET( false )
unsigned char *pTexture = NULL;
const int iLen = BLOCK_WIDTH * BLOCK_HEIGHT * 3;
// Must be a power of 2
//if( BLOCK_WIDTH & ( BLOCK_WIDTH - 1 ) ) LOG_ERR_RET( false )
// Data cant be null
if( pData == NULL ) LOG_ERR_RET( false )
// Create memory to hole the texture
pTexture = new unsigned char[ iLen ];
// Be sure it was created
if( pTexture == NULL ) LOG_ERR_RET( false )
// Copy the data passed in into the new data holder
memcpy( pTexture, pData, iLen * sizeof( unsigned char ) );
// Create the texture
glGenTextures( 1, &m_pLightmapBlocks[ iIndex ] );
// Bind it
glBindTexture( GL_TEXTURE_2D, m_pLightmapBlocks[ iIndex ] );
// glCopyTexImage2D( GL_TEXTURE_2D, 0, GL_RGB, 0, 0, BLOCK_WIDTH, BLOCK_HEIGHT, 0 );
// COpy the pixel data to the texture
glTexImage2D( GL_TEXTURE_2D, 0, 3, BLOCK_WIDTH, BLOCK_HEIGHT,
0, GL_RGB, GL_UNSIGNED_BYTE, pTexture );
// Set stuff for this texture
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR );
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
// Clean up
if( pTexture != NULL ) delete[] pTexture;
RET( true )
}
GETTING THE TEXTURE DATA AND PUTTING IT INTO AN ARRAY
glBindTexture( GL_TEXTURE_2D, m_pLightmapBlocks[ 0 ] );
glCopyTexImage2D( GL_TEXTURE_2D, 0, GL_RGB, 0, 0, BLOCK_WIDTH, BLOCK_HEIGHT, 0 );
glGetTexImage( GL_TEXTURE_2D, 0, GL_RGB, GL_UNSIGNED_BYTE, pPic );
if( !GenerateScreenShot( "Lightmap.tga", BLOCK_WIDTH, BLOCK_HEIGHT, true, pBlock ) )
{
LOG_ERR_RET( false )
}
