OpenGL是专业的图形程序接口，功能非常强大，调用方便的底层图形库。本文汇总了运用OPENGL加载BMP纹理图的几个实现方法。
方法一：
首先获取位图句柄：
HBITMAP hBmp = (HBITMAP) ::LoadImage (AfxGetResourceHandle(),MAKEINTRESOURCE(IDB_BITMAP1), IMAGE_BITMAP, 0, 0,LR_CREATEDIBSECTION);
然后根据位图句柄得到位图信息：
BITMAP BM; ::GetObject (hBmp, sizeof (BM), &BM);
最后根据位图信息中的RGB值建立纹理：
gluBuild2DMipmaps( GL_TEXTURE_2D, 3, BM.bmWidth, BM.bmHeight,GL_BGR_EXT, GL_UNSIGNED_BYTE,BM.bmBits);
方法二：
首先用OpenGL辅助库获得位图信息：
AUX_RGBImageRec* TextureImage[1];
TextureImage[0]=auxDIBImageLoad("1.bmp");
然后建立纹理
gluBuild2DMipmaps(GL_TEXTURE_2D, 3, TextureImage[0]->sizeX, TextureImage[0]->sizeY, GL_RGB, GL_UNSIGNED_BYTE, TextureImage[0]->data);
方法三：
从底层做，需要了解bmp文件的结构，首先读取bmp文件结构，包括文件头、信息头和数据，数据用于后面定义纹理
long ImageWidth=256;
long ImageHeight=256;
GLubyte Image[256][256][3];
void ReadHeader(FILE *fp , BITMAPFH * p_bitmapheader , BITMAPIH *p_bitmapinfo)
{
fseek(fp, 0, SEEK_SET) ;
fread( &p_bitmapheader->bfType,sizeof(unsigned short), 1, fp );
fseek(fp, 2, SEEK_SET) ;
fread( &p_bitmapheader->bfSize,sizeof(unsigned long), 1, fp );
fseek(fp, 6, SEEK_SET) ;
fread( &p_bitmapheader->bfReserved1,sizeof(unsigned short), 1, fp );
fseek(fp, 8, SEEK_SET) ;
fread( &p_bitmapheader->bfReserved2,sizeof(unsigned short), 1, fp );
fseek(fp, 10, SEEK_SET) ;
fread( &p_bitmapheader->bfOffBits,sizeof(unsigned long), 1, fp );
fseek(fp, 14, SEEK_SET) ;
fread( &p_bitmapinfo->biSize, sizeof(unsigned long), 1, fp );
fseek(fp, 18, SEEK_SET) ;
fread( &p_bitmapinfo->biWidth, sizeof(unsigned long), 1, fp );
fseek(fp, 22, SEEK_SET) ;
fread( &p_bitmapinfo->biHeight, sizeof(unsigned long), 1, fp );
fseek(fp, 26, SEEK_SET) ;
fread( &p_bitmapinfo->biPlanes, sizeof(unsigned short), 1, fp );
fseek(fp, 28, SEEK_SET) ;
fread( &p_bitmapinfo->biBitCount, sizeof(unsigned short), 1, fp );
fseek(fp, 30, SEEK_SET) ;
fread( &p_bitmapinfo->biCompression, sizeof(unsigned long), 1, fp );
fseek(fp, 34, SEEK_SET) ;
fread( &p_bitmapinfo->biSizeImage, sizeof(unsigned long), 1, fp );
fseek(fp, 38, SEEK_SET) ;
fread( &p_bitmapinfo->biXPelsPerMeter, sizeof(unsigned long), 1, fp );
fseek(fp, 42, SEEK_SET) ;
fread( &p_bitmapinfo->biYPelsPerMeter, sizeof(unsigned long), 1, fp );
fseek(fp, 46, SEEK_SET) ;
fread( &p_bitmapinfo->biClrUsed, sizeof(unsigned long), 1, fp );
fseek(fp, 50, SEEK_SET) ;
fread( &p_bitmapinfo->biClrImportant, sizeof(unsigned long), 1, fp );
}
void ReadBitmapFile()
{
BITMAPFH bitmapheader ;
BITMAPIH bitmapinfo ;
FILE *fp;
fp = fopen("6.bmp" , "r") ;
if(!fp)
{
puts("Read file failed.") ;
return;
}
ReadHeader(fp, &bitmapheader , &bitmapinfo) ;
if(bitmapinfo.biBitCount != 24)
{
puts("UNSUPPORT") ;
return;
}
ImageWidth = bitmapinfo.biWidth;
ImageHeight = bitmapinfo.biHeight;
int i=bitmapheader.bfOffBits;
while(i