[转]opengl入门例题(读取bmp图片,并显示)

#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 == 0) exit(0);
 //读取图像大小
 fseek(pfile,0x0012,SEEK_SET);
 fread(&imagewidth,sizeof(imagewidth),1,pfile);
 fread(&imageheight,sizeof(imageheight),1,pfile);
 //计算像素数据长度
 pixellength=imagewidth*3;
 while(pixellength%4 != 0)pixellength++;
 pixellength *= imageheight;
 //读取像素数据
 pixeldata = (GLubyte*)malloc(pixellength);
 if(pixeldata == 0) exit(0);
 fseek(pfile,54,SEEK_SET);
 fread(pixeldata,pixellength,1,pfile);
 
 //关闭文件
 fclose(pfile);
 //初始化glut运行
 glutInit(&argc,argv);
 glutInitDisplayMode(GLUT_DOUBLE|GLUT_RGBA);
 glutInitWindowPosition(100,100);
 glutInitWindowSize(imagewidth,imageheight);
 glutCreateWindow(FileName);
 glutDisplayFunc(&display);
 glutMainLoop();
//-------------------------------------
 free(pixeldata);
 return 0;
}

原文链接:opengl入门例题(读取bmp图片,并显示)

链接2:opengl下png图片的加载与显示

链接3:OpenGL加载与显示Targa位图文件

posted @ 2018-05-12 23:22  rainbow70626  阅读(3355)  评论(0编辑  收藏  举报