Attachment 27402 Details for Bug 22625 – C-code to illustrate the bug. Trivial GL example.

C-code to illustrate the bug. Trivial GL example.

quadsingle.c (text/x-csrc), 3.00 KB, created by Ian Hutchinson on 2009-07-05 13:12:34 UTC

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Creator: Ian Hutchinson

Created: 2009-07-05 13:12:34 UTC

Size: 3.00 KB

patch

obsolete

>/* Modified version of the simple OpenGL program from 
>http://www.opengl.org/wiki/Programming_OpenGL_in_Linux:_GLX_and_Xlib
>to demonstrate GL bugs with intelgraphics driver, and compiz
> Ian Hutchinson, July 2009*/
>
>#include<stdio.h>
>#include<stdlib.h>
>#include<X11/X.h>
>#include<X11/Xlib.h>
>#include<GL/gl.h>
>#include<GL/glx.h>
>#include<GL/glu.h>
>
>Display                 *dpy;
>Window                  root;
>GLint                   att[] = { GLX_RGBA, 
>				  GLX_DEPTH_SIZE,
>				  24, /* Depth 24 */
>				  GLX_DOUBLEBUFFER,
>				  None };
>XVisualInfo             *vi;
>Colormap                cmap;
>XSetWindowAttributes    swa;
>Window                  win;
>GLXContext              glc;
>XWindowAttributes       gwa;
>XEvent                  xev;
>
>void DrawAQuad() {
> glClearColor(1.0, 1.0, 1.0, 1.0);
> glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
> glMatrixMode(GL_PROJECTION);
> glLoadIdentity();
> glOrtho(-1., 1., -1., 1., 1., 20.);
> glMatrixMode(GL_MODELVIEW);
> glLoadIdentity();
> gluLookAt(0., 0., 10., 0., 0., 0., 0., 1., 0.);
> glBegin(GL_QUADS);
>  glColor3f(1., 0., 0.); glVertex3f(-.75, -.75, 0.);
>  glColor3f(0., 1., 0.); glVertex3f( .75, -.75, 0.);
>  glColor3f(0., 0., 1.); glVertex3f( .75,  .75, 0.);
>  glColor3f(1., 1., 0.); glVertex3f(-.75,  .75, 0.);
> glEnd(); } 
> 
>int main(int argc, char *argv[]) {
>
> dpy = XOpenDisplay(NULL);
> 
> if(dpy == NULL) {
>        printf("\n\tcannot connect to X server\n\n");
>        exit(0); }
>        
> root = DefaultRootWindow(dpy);
>
> vi = glXChooseVisual(dpy, 0, att);
>
> if(vi == NULL) {
>        printf("\n\tno appropriate visual found\n\n");
>        exit(0); } 
> else {
>        printf("\n\tvisual %p selected\n", vi->visualid); }/* %p creates hexadecimal output like in glxinfo */
>
> cmap = XCreateColormap(dpy, root, vi->visual, AllocNone);
>
> swa.colormap = cmap;
> swa.event_mask = ExposureMask | KeyPressMask;
> 
> win = XCreateWindow(dpy, root, 0, 0, 600, 600, 0, vi->depth, InputOutput, vi->visual, CWColormap | CWEventMask, &swa);
>
> XMapWindow(dpy, win);
> XStoreName(dpy, win, "VERY SIMPLE APPLICATION");
> 
> glc = glXCreateContext(dpy, vi, NULL, GL_TRUE);
> glXMakeCurrent(dpy, win, glc);
>
> glEnable(GL_DEPTH_TEST);   
> /* Instead of drawing by default to the back buffer. We specify drawing
>    to the front buffer. Then instead of glXSwapBuffers we glFlush.
>    Also in response to the Expose events we glFlush instead of swap.
> */
> glDrawBuffer(GL_FRONT);
> glFlush();
>/*glXSwapBuffers(dpy, win); */
>  while(1) {
>        XNextEvent(dpy, &xev);
>                if(xev.type == Expose) {
>                XGetWindowAttributes(dpy, win, &gwa);
>                glViewport(0, 0, gwa.width, gwa.height);
>                DrawAQuad(); 
>		glFlush();
>                /*glXSwapBuffers(dpy, win);*/
>	}else if(xev.type == KeyPress) {
>                glXMakeCurrent(dpy, None, NULL);
>                glXDestroyContext(dpy, glc);
>                XDestroyWindow(dpy, win);
>                XCloseDisplay(dpy);
>                exit(0); }
>        } /* this closes while(1) { */
>} /* this is the } which closes int main(int argc, char *argv[]) { */

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Attachments on bug 22625: 27402

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