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| | i followed your article on how to load bitmap files manually (as i don't want to use glaux etc), but i get strange results: www.vexator.net/argh.jpg
any idea why?
FILE *fp = fopen(filename, "rb");
unsigned short uint;
unsigned int dword;
unsigned short word;
long llong;
fread(&uint, sizeof(uint), 1, fp);
fread(&dword, sizeof(dword), 1, fp);
fread(&uint, sizeof(uint), 1, fp);
fread(&uint, sizeof(uint), 1, fp);
fread(&dword, sizeof(dword), 1, fp);
fread(&dword, sizeof(dword), 1, fp);
long width, height;
fread(&width, sizeof(long), 1, fp);
fread(&height, sizeof(long), 1, fp);
fread(&word, sizeof(word), 1, fp);
unsigned short bitcount;
fread(&bitcount, sizeof(unsigned short), 1, fp);
unsigned long compression;
fread(&compression, sizeof(unsigned long), 1, fp);
fread(&dword, sizeof(dword), 1, fp);
fread(&llong, sizeof(long), 1, fp);
fread(&llong, sizeof(long), 1, fp);
fread(&dword, sizeof(dword), 1, fp);
fread(&dword, sizeof(dword), 1, fp);
unsigned char *imagedata;
imagedata = new unsigned char[width * height * 4];
for(int x=0; x < width; x++)
{
for(int y=0; y < height; y++)
{
fread(&imagedata[(x * height + y)*4+0], sizeof(char), 1, fp);
fread(&imagedata[(x * height + y)*4+1], sizeof(char), 1, fp);
fread(&imagedata[(x * height + y)*4+2], sizeof(char), 1, fp);
int r = imagedata[(x * height + y)*4+2];
int b = imagedata[(x * height + y)*4+0];
imagedata[(x * height + y)*4+0] = r;
imagedata[(x * height + y)*4+2] = b;
if(imagedata[(x * height + y)*4+0] == 255 && imagedata[(x * height + y)*4+1] == 0 && imagedata[(x * height + y)*4+2] == 255)
imagedata[(x * height + y)*4+3] = 0;
else
imagedata[(x * height + y)*4+3] = 255;
}
}
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_NEAREST );
gluBuild2DMipmaps( GL_TEXTURE_2D, 3, width, height, GL_BGR, GL_UNSIGNED_BYTE, imagedata );
delete[] imagedata; |
