/** * compile with: gcc -o displayMultiple02 displayMultiple02.c -lX11 -lGL */ #include <stdio.h> #include <X11/X.h> #include <X11/Xlib.h> #include <X11/Xutil.h> #include <GL/glx.h> #include <GL/gl.h> static void testOrder(int reverseDestroyOrder, const char * msg); static int useXLockDisplay = 0; int main(int nargs, char **vargs) { int arg=1; while(arg<nargs) { if(0 == strcmp(vargs[arg], "-xlock")) { useXLockDisplay = 1; } arg++; } fprintf(stderr, "-xlock (XLockDisplay): %d\n", useXLockDisplay); if( useXLockDisplay ) { XInitThreads(); } testOrder(0, "Normal order"); testOrder(1, "Reverse order"); return 0; } static void createGLWin(Display *dpy, int width, int height, Window *rWin, GLXContext *rCtx); static void useGL(Display *dpy, Window win, GLXContext ctx, int width, int height); static void XLOCKDISPLAY(Display *dpy) { if( useXLockDisplay ) { XLockDisplay(dpy); } } static void XUNLOCKDISPLAY(Display *dpy) { if( useXLockDisplay ) { XUnlockDisplay(dpy); } } void testOrder(int reverseDestroyOrder, const char * msg) { int major, minor; Display *disp1; Window win1; GLXContext ctx1; fprintf(stderr, "%s: Create #1\n", msg); disp1 = XOpenDisplay(NULL); XLOCKDISPLAY(disp1); createGLWin(disp1, 200, 200, &win1, &ctx1); useGL(disp1, win1, ctx1, 200, 200); XUNLOCKDISPLAY(disp1); if(reverseDestroyOrder) { fprintf(stderr, "%s: Destroy #1.0\n", msg); XLOCKDISPLAY(disp1); fprintf(stderr, "%s: Destroy #1.1\n", msg); glXMakeCurrent(disp1, 0, 0); fprintf(stderr, "%s: Destroy #1.2\n", msg); glXDestroyContext(disp1, ctx1); fprintf(stderr, "%s: Destroy #1.3\n", msg); XUNLOCKDISPLAY(disp1); fprintf(stderr, "%s: Destroy #1.4\n", msg); XCloseDisplay(disp1); fprintf(stderr, "%s: Destroy #1.X\n", msg); } else { fprintf(stderr, "%s: Destroy #1.0\n", msg); XLOCKDISPLAY(disp1); glXMakeCurrent(disp1, 0, 0); glXDestroyContext(disp1, ctx1); XUNLOCKDISPLAY(disp1); XCloseDisplay(disp1); fprintf(stderr, "%s: Destroy #1.X\n", msg); } fprintf(stderr, "%s: Success - no bug\n", msg); } /* attributes for a double buffered visual in RGBA format with at least * 4 bits per color and a 16 bit depth buffer */ static int attrListDbl[] = { GLX_RGBA, GLX_DOUBLEBUFFER, GLX_RED_SIZE, 4, GLX_GREEN_SIZE, 4, GLX_BLUE_SIZE, 4, GLX_DEPTH_SIZE, 16, None }; void createGLWin(Display *dpy, int width, int height, Window *rWin, GLXContext *rCtx) { int screen = DefaultScreen(dpy); XVisualInfo *vi = glXChooseVisual(dpy, screen, attrListDbl); Colormap cmap; XSetWindowAttributes attr; /* create a GLX context */ *rCtx = glXCreateContext(dpy, vi, 0, GL_TRUE); /* create a color map */ cmap = XCreateColormap(dpy, RootWindow(dpy, vi->screen), vi->visual, AllocNone); attr.colormap = cmap; attr.border_pixel = 0; /* create a window in window mode*/ attr.event_mask = ExposureMask | KeyPressMask | ButtonPressMask | StructureNotifyMask; *rWin = XCreateWindow(dpy, RootWindow(dpy, vi->screen), 0, 0, width, height, 0, vi->depth, InputOutput, vi->visual, CWBorderPixel | CWColormap | CWEventMask, &attr); XMapRaised(dpy, *rWin); } void useGL(Display *dpy, Window win, GLXContext ctx, int width, int height) { glXMakeCurrent(dpy, win, ctx); glShadeModel(GL_SMOOTH); glClearColor(0.0f, 0.0f, 0.0f, 0.0f); glClearDepth(1.0f); glViewport(0, 0, width, height); glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glXSwapBuffers(dpy, win); glXMakeCurrent(dpy, 0, 0); }