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/**
* compile with: gcc -o contextRetargetDrawable01 contextRetargetDrawable01.c -lX11 -lGL
*/
#include <stdio.h>
#include <unistd.h>
#include <X11/X.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <GL/glx.h>
#include <GL/gl.h>
static PFNGLXSWAPINTERVALSGIPROC _glXSwapIntervalSGI = NULL;
static void testRetarget();
static const char * msg = "contextRetargetDrawable01";
static const useconds_t demodelay = 2 * 1000 * 1000;
int main(int nargs, char **vargs) {
_glXSwapIntervalSGI = (PFNGLXSWAPINTERVALSGIPROC) glXGetProcAddressARB("glXSwapIntervalSGI");
if(NULL == _glXSwapIntervalSGI) {
fprintf(stderr, "No glXSwapIntervalSGI avail, bail out\n");
return 1;
}
testRetarget();
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, float c, int swapInterval);
static void testRetarget() {
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);
fprintf(stderr, "%s: Create #2\n", msg);
disp2 = disp1;
// disp2 = XOpenDisplay(NULL);
createGLWin(disp2, 300, 300, &win2, &ctx2);
fprintf(stderr, "%s: Use #1.1\n", msg);
useGL(disp1, win1, ctx1, 200, 200, 0.0f, 1); // OK
fprintf(stderr, "%s: Use #1.2\n", msg);
useGL(disp2, win2, ctx2, 300, 300, 1.0f, 1); // OK
usleep( demodelay );
fprintf(stderr, "%s: Retarget Drawable\n", msg);
{
Window _win = win2;
win2 = win1;
win1 = _win;
}
fprintf(stderr, "%s: Use #2.1\n", msg);
useGL(disp1, win1, ctx1, 200, 200, 0.0f, 0); // no setSwapInterval - OK
fprintf(stderr, "%s: Use #2.2\n", msg);
useGL(disp2, win2, ctx2, 300, 300, 1.0f, 0); // no setSwapInterval - OK
usleep( demodelay );
fprintf(stderr, "%s: Use #3.1\n", msg);
useGL(disp1, win1, ctx1, 200, 200, 0.1f, 1); // setSwapInterval - crash on Mesa 8.0.4 DRI2
fprintf(stderr, "%s: Use #3.2\n", msg);
useGL(disp2, win2, ctx2, 300, 300, 0.9f, 1); // setSwapInterval - crash on Mesa 8.0.4 DRI2
fprintf(stderr, "%s: Success - no bug\n", msg);
usleep( demodelay );
fprintf(stderr, "%s: Destroy #1.0\n", msg);
glXMakeContextCurrent(disp1, 0, 0, 0);
glXDestroyContext(disp1, ctx1);
if( disp1 != disp2 ) {
XCloseDisplay(disp1);
}
fprintf(stderr, "%s: Destroy #1.X\n", msg);
fprintf(stderr, "%s: Destroy #2.0\n", msg);
glXMakeContextCurrent(disp2, 0, 0, 0);
glXDestroyContext(disp2, ctx2);
XCloseDisplay(disp2);
fprintf(stderr, "%s: Destroy #2.X\n", msg);
fprintf(stderr, "%s: Exit - OK\n", msg);
}
static void useGL(Display *dpy, Window win, GLXContext ctx, int width, int height, float c, int swapInterval)
{
glXMakeContextCurrent(dpy, win, win, ctx);
glViewport(0, 0, width, height);
if(0 < swapInterval) {
fprintf(stderr, "%s: glXSwapIntervalSGI(1)\n", msg);
_glXSwapIntervalSGI(1); // offending op after retargeting drawable
}
fprintf(stderr, "GL_VENDOR: %s\n", glGetString(GL_VENDOR));
fprintf(stderr, "GL_VERSION: %s\n", glGetString(GL_VERSION));
fprintf(stderr, "GL_RENDERER: %s\n", glGetString(GL_RENDERER));
glClearColor(c, c, c, 0.0f);
glClearDepth(1.0f);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glXSwapBuffers(dpy, win);
glXMakeContextCurrent(dpy, 0, 0, 0);
}
/* 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 };
static 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);
}
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