opengl打开一张BMP图片.zip_opengl 打开图像_opengl 显示_opengl显示bmp_opengl绘制图片

#include<gl/glut.h> #define FileName "grab.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("grab.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; }