/* =============================================================================
=============================================================================== */
int C3DSceneMgr::createTexture(string strFileName, int &width, int &height, int iTxMode)
{
if (strFileName == "") // Return from the function if no file name was passed in
return -1;
if (!fileexists(strFileName))
return -1;
// Load the image and store the data
int textureID = -1;
if (getExt(strFileName) == ".dds")
{
DDS_IMAGE_DATA *pDDSImageData = NULL;
if ((pDDSImageData = loadDDSTextureFile(strFileName)) != NULL)
{
textureID = createTextureDDS(pDDSImageData);
height = pDDSImageData->sizeY;
width = pDDSImageData->sizeX;
}
else // case where worldwind wraps jpegs in dds files
{
Fl_RGB_Image *img = new Fl_JPEG_Image(strFileName.c_str());
if (img->d() == 0)
return -1;
width = img->w();
height = img->h();
const unsigned char *pData = (const unsigned char *) img->data()[0];
textureID = createTexture(pData, width, height, GL_RGB, GL_RGB, iTxMode);
delete img;
}
}
else
{
Fl_Image * img = openTextureFile(strFileName);
if (img == NULL)
return -1;
width = img->w();
height = img->h();
const unsigned char *pData = (const unsigned char *) img->data()[0];
textureID = createTexture(pData, width, height, img->d() == 4 ? GL_RGBA : GL_RGB, GL_RGBA, iTxMode);
delete img;
}
return textureID;
}
//-----------------------------------------------------------------------------
// Name: loadCompressedTexture()
// Desc:
//-----------------------------------------------------------------------------
unsigned int CDDS::loadCompressedTexture( const char *filename ,GLint TexParameter)
{
// NOTE: Unlike "lena.bmp", "lena.dds" actually contains its own mip-map
// levels, which are also compressed.
g_compressedTextureID=0;
DDS_IMAGE_DATA *pDDSImageData = loadDDSTextureFile( filename );
if( pDDSImageData != NULL )
{
int nHeight = pDDSImageData->height;
int nWidth = pDDSImageData->width;
int nNumMipMaps = pDDSImageData->numMipMaps;
int nBlockSize;
if( pDDSImageData->format == GL_COMPRESSED_RGBA_S3TC_DXT1_EXT )
nBlockSize = 8;
else
nBlockSize = 16;
glGenTextures( 1, &g_compressedTextureID );
glBindTexture( GL_TEXTURE_2D, g_compressedTextureID );
if(TexParameter!=0)
{
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, TexParameter );
}
else
{
if(nNumMipMaps>1)
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR );
else
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR );
}
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
int nSize;
int nOffset = 0;
// Load the mip-map levels
for( int i = 0; i < nNumMipMaps; ++i )
{
if( nWidth == 0 ) nWidth = 1;
if( nHeight == 0 ) nHeight = 1;
nSize = ((nWidth+3)/4) * ((nHeight+3)/4) * nBlockSize;
glCompressedTexImage2DARB( GL_TEXTURE_2D,
i,
pDDSImageData->format,
nWidth,
nHeight,
0,
nSize,
pDDSImageData->pixels + nOffset );
nOffset += nSize;
// Half the image size for the next mip-map level...
nWidth = (nWidth / 2);
nHeight = (nHeight / 2);
}
}
if( pDDSImageData != NULL )
{
if( pDDSImageData->pixels != NULL )
free( pDDSImageData->pixels );
free( pDDSImageData );
}
return g_compressedTextureID;
}