#include<gl/glut.h>

#define FileName "bliss.bmp"

static GLint imagewidth;

static GLint imageheight;

static GLint pixellength;

static GLubyte* pixeldata;

#include<stdio.h>

#include<stdlib.h>

void display(void)

{

 //glClear(GL_COLOR_BUFFER_BIT);

 //绘制像素

 glDrawPixels(imagewidth,imageheight,GL_BGR_EXT,GL_UNSIGNED_BYTE,pixeldata);

 //---------------------------------

 glFlush();

 glutSwapBuffers();

}

int main(int argc,char* argv[])

{

 //打开文件

 FILE* pfile=fopen("bliss.bmp","rb");

 if(pfile == ) exit();

 //读取图像大小

 fseek(pfile,0x0012,SEEK_SET);

 fread(&imagewidth,sizeof(imagewidth),,pfile);

 fread(&imageheight,sizeof(imageheight),,pfile);

 //计算像素数据长度

 pixellength=imagewidth*;

 while(pixellength% != )pixellength++;

 pixellength *= imageheight;

 //读取像素数据

 pixeldata = (GLubyte*)malloc(pixellength);

 if(pixeldata == ) exit();

 fseek(pfile,,SEEK_SET);

 fread(pixeldata,pixellength,,pfile);

 //关闭文件

 fclose(pfile);

 //初始化glut运行

 glutInit(&argc,argv);

 glutInitDisplayMode(GLUT_DOUBLE|GLUT_RGBA);

 glutInitWindowPosition(,);

 glutInitWindowSize(imagewidth,imageheight);

 glutCreateWindow(FileName);

 glutDisplayFunc(&display);

 glutMainLoop();

//-------------------------------------

 free(pixeldata);

 return ;

}