I have a problem loading bmp files..
it just wont work ! !! ! !
The idea is that im going to load the bmp.
It must be a 24bit bmp.
And then im going to add a alpha channel and set it to 0 if the color equal the colorkey.
The image now show a white space ...
*my tga loading rutine is working but i want my bmp thing to work too... : the code displaying the image is ok*
Here is the code i use for loading a bmp:
*removed most of the error handling to make it easy to read*
EDIT: plz exuse me for not fixing the tabs n stuff..
its not how the code look in my IDE
EDIT2: dint know editing screwed the source tags...
put some /////// into to seperate :D
uint CTexture::LoadBMP( string strFile )
{
ifstream fin;
BITMAPFILEHEADER bmp_header;
BITMAPINFOHEADER bmp_info;
BYTE* bImageData = NULL;
WORD wChannels = 0;
DWORD dwImageSize = 0;
BYTE* bFinalData = NULL;
WORD wFinalChannels = 0;
DWORD dwFinalSize = 0;
uint iID = 0; //return id
fin.open( strFile.c_str(), ios::binary | ios::in );
if( fin.fail() )
{
}
fin.read( (char*)&bmp_header , sizeof(bmp_header) );
if( !fin.good() ) // read error ?
{
}
if( bmp_header.bfType != 0x4D42 ) // check that is a bmp
{
}
fin.read( (char*)&bmp_info, sizeof(bmp_info) );
if( !fin.good() ) // read error ?
{
}
// move to the start of data
fin.seekg( bmp_header.bfOffBits, ios::beg );
// how many channels
wChannels = bmp_info.biBitCount / 8;
if( wChannels != 3 )
{
}
wFinalChannels = 4;
dwImageSize = abs(bmp_info.biWidth) * abs(bmp_info.biHeight) * wChannels;
dwFinalSize = abs(bmp_info.biWidth) * abs(bmp_info.biHeight) * wFinalChannels;
// allocate mem for the image data
bImageData = new BYTE[dwImageSize];
if( bImageData == NULL)
{
}
bFinalData = new BYTE[dwFinalSize];
if( bFinalData == NULL)
{
}
// read the pixel data
fin.read( (char*)bImageData, dwImageSize );
if( !fin.good() ) // any unexpected errors(1) ?
{
}
fin.close(); // close the file
// convert & fake the image
// convert BGR into RGB
uint src;
uint dst;
for( src = 0, dst = 0;src < dwImageSize;src += wChannels, dst += wFinalChannels)
{
BYTE tmp = bImageData[src+2];
bImageData[src+2] = bImageData[src];
bImageData[src] = tmp;
// copy the reults over to the new header
bFinalData[dst] = bImageData[src];
bFinalData[dst+1] = bImageData[src+1];
bFinalData[dst+2] = bImageData[src+2];
bFinalData[dst+3] = 0xFF;
// r g b a
Colorkey( bFinalData[dst], bFinalData[dst+1], bFinalData[dst+2], bFinalData[dst+3] );
}
iID = CreateTexture( bImageData, strFile, bmp_info.biWidth, bmp_info.biHeight );
delete[] bImageData;
delete[] bFinalData;
return( iID );
}
//////////////////////////////////////////////////////////////
//here is the colorkey function:
//////////////////////////////////////////////////////////////
void Colorkey( BYTE& r, BYTE& g, BYTE& b, BYTE& a )
{
// check if we should colorkey it
if( (r == COLORKEY_R) && (g == COLORKEY_G) && (b == COLORKEY_B) )
a = 0;
else
a = 0xFF;
}
//////////////////////////////////////////////////////////////
//here is the CreateTexture function:
//////////////////////////////////////////////////////////////
uint CreateTexture( BYTE* bImageData, const string& strFile, DWORD sizeX, DWORD sizeY )
{
uint ID;
glGenTextures( 1, &ID );
glBindTexture( GL_TEXTURE_2D, ID );
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST );
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST );
glTexImage2D( GL_TEXTURE_2D, 0, GL_RGBA, sizeX, sizeY, 0, GL_RGBA, GL_UNSIGNED_BYTE, bImageData );
return( ID );
}
[edited by - LogouT on January 23, 2004 5:56:08 PM]
