c - OpenGL: Save framebuffer to image, file -


i wrote lines of code draw spinning rectangle:

#include "glut.h" static glfloat spin = 0.0; /* current angle */ void init(void)  {     glclearcolor (0.0, 0.0, 0.0, 0.0);     glshademodel (gl_flat); } void display(void) {     glclear(gl_color_buffer_bit);     glpushmatrix();     glrotatef(spin, 0.0, 0.0, 1.0);  /* rotate oxyz (oz) */     glcolor3f(1.0, 1.0, 1.0); /* bgr-color: white; */     glrectf(-25.0, -25.0, 25.0, 25.0); /* rectangle */     glpopmatrix();     glutswapbuffers();  /* swap 2 buffer */ } void spindisplay(void) {     spin = spin + 2.0;  /* add 2 degrees every loop action */     if (spin > 360.0)         spin = spin - 360.0;     glutpostredisplay();  /* alert: redraw */ } /* change window mode */ void reshape(int w, int h) {     glviewport (0, 0, (glsizei) w, (glsizei) h); /* change viewport */     glmatrixmode(gl_projection);     glloadidentity();     glortho(-50.0, 50.0, -50.0, 50.0, -1.0, 1.0);     glmatrixmode(gl_modelview);     glloadidentity(); } /* mouse interaction */ void mouse(int button, int state, int x, int y)  {     switch (button) {     case glut_left_button:  /* left mouse */         if (state == glut_down)             glutidlefunc(spindisplay); /* idle mode switch spindisplay */         break;         //case glut_middle_button:  /* middle mouse button */         //if (state == glut_down)         //glutidlefunc(null);         //break;     default:         break;     } } /* main */ int main(int argc, char** argv) {     glutinit(&argc, argv);     glutinitdisplaymode (glut_double | glut_rgb);  /* double buffer */     glutinitwindowsize (500, 500);      glutinitwindowposition (100, 100);     glutcreatewindow ("spinning rectangle");     init ();     glutdisplayfunc(display);      glutreshapefunc(reshape); /* reshape func (redraw) when window size changed */     glutmousefunc(mouse); /* mouse func */     glutmainloop();     return 0; }

and wanna save framebuffer image (jpeg, bmp, tiff) or file. tell me how? need use lib jpeglib, libtiff?


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