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/**
* 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);
int main(int nargs, char **vargs) {
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);
void testOrder(int reverseDestroyOrder, const char * msg) {
int major, minor;
Display *disp1;
Window win1;
GLXContext ctx1;
Display *disp2;
Window win2;
GLXContext ctx2;
fprintf(stderr, "%s: Create #1\n", msg);
disp1 = XOpenDisplay(NULL);
createGLWin(disp1, 200, 200, &win1, &ctx1);
useGL(disp1, win1, ctx1, 200, 200);
fprintf(stderr, "%s: Create #2\n", msg);
disp2 = XOpenDisplay(NULL);
createGLWin(disp2, 300, 300, &win2, &ctx2);
useGL(disp2, win2, ctx2, 300, 300);
if(reverseDestroyOrder) {
fprintf(stderr, "%s: Destroy #2\n", msg);
glXMakeCurrent(disp2, 0, 0);
glXDestroyContext(disp2, ctx2);
XCloseDisplay(disp2);
fprintf(stderr, "%s: Destroy #1\n", msg);
glXMakeCurrent(disp1, 0, 0);
glXDestroyContext(disp1, ctx1);
XCloseDisplay(disp1);
} else {
fprintf(stderr, "%s: Destroy #1\n", msg);
glXMakeCurrent(disp1, 0, 0);
glXDestroyContext(disp1, ctx1);
XCloseDisplay(disp1);
fprintf(stderr, "%s: Destroy #2\n", msg);
glXMakeCurrent(disp2, 0, 0);
glXDestroyContext(disp2, ctx2);
XCloseDisplay(disp2);
}
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);
}
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