Attachment 122625 Details for Bug 94752 – program to reproduce the bug

program to reproduce the bug

one_glxcontext_with_two_windows.c (text/plain), 2.88 KB, created by Guilherme on 2016-03-29 23:31:34 UTC

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Creator: Guilherme

Created: 2016-03-29 23:31:34 UTC

Size: 2.88 KB

patch

obsolete

>
>// Based on https://www.opengl.org/wiki/Programming_OpenGL_in_Linux:_GLX_and_Xlib
>
>#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, GLX_DOUBLEBUFFER, None };
>XVisualInfo *vi;
>Colormap cmap;
>Colormap cmap2;
>XSetWindowAttributes swa;
>XSetWindowAttributes swa2;
>Window win;
>Window win2;
>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();
>}
>
>void CreateWindow(Colormap *cmap, XSetWindowAttributes *swa, Window *win, Display* dpy, const char* title) {
>    *cmap = XCreateColormap(dpy, root, vi->visual, AllocNone);
>
>    swa->colormap = *cmap;
>    swa->event_mask = ExposureMask | KeyPressMask;
>
>    *win = XCreateWindow(dpy, root, 0, 0, 300, 300, 0, vi->depth, InputOutput,
>            vi->visual, CWColormap | CWEventMask, swa);
>
>    XMapWindow(dpy, *win);
>    XStoreName(dpy, *win, title);
>
>    XSync(dpy, 0);
>}
>
>
>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", (void *) vi->visualid); /* %p creates hexadecimal output like in glxinfo */
>    }
>
>    CreateWindow(&cmap2, &swa2, &win2, dpy, "Second Window");
>    CreateWindow(&cmap, &swa, &win, dpy, "First Window");
>
>    glc = glXCreateContext(dpy, vi, NULL, GL_TRUE);
>    glXMakeCurrent(dpy, win2, glc);
>    printf("OpenGL version: %s\n", (char*)glGetString(GL_VERSION));
>    glXMakeCurrent(dpy, None, NULL);
>    XDestroyWindow(dpy, win2);
>
>    glEnable(GL_DEPTH_TEST);
>
>    while (1) {
>        XNextEvent(dpy, &xev);
>
>        if (xev.type == Expose) {
>            glXMakeCurrent(dpy, win, glc);
>            XGetWindowAttributes(dpy, win, &gwa);
>            glViewport(0, 0, gwa.width, gwa.height);
>            DrawAQuad();
>            glXSwapBuffers(dpy, win);
>        }
>
>        else if (xev.type == KeyPress) {
>            glXMakeCurrent(dpy, None, NULL);
>            glXDestroyContext(dpy, glc);
>            XDestroyWindow(dpy, win);
>            XCloseDisplay(dpy);
>            exit(0);
>        }
>    }
>}

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Attachments on bug 94752: 122625 | 122626 | 122627

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