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include some error-checking from glx-dbl-bare and change direct to GL_TRUE in glXCreateContext() call

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This commit is contained in:
Josh Holtrop 2017-08-29 16:15:40 -04:00
parent 51aa9075e1
commit d71c26b02b
1 changed files with 30 additions and 4 deletions
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34
glx-bare/glx-bare.c
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@ -2,6 +2,7 @@
#include <GL/glx.h> #include <GL/glx.h>
#include <GL/gl.h> #include <GL/gl.h>
#include <unistd.h> #include <unistd.h>
#include <stdio.h>
static int attributeList[] = { GLX_RGBA, None }; static int attributeList[] = { GLX_RGBA, None };
static Bool WaitForNotify(Display *d, XEvent *e, char *arg) { static Bool WaitForNotify(Display *d, XEvent *e, char *arg) {
return (e->type == MapNotify) && (e->xmap.window == (Window)arg); return (e->type == MapNotify) && (e->xmap.window == (Window)arg);
@ -15,11 +16,28 @@ int main(int argc, char **argv) {
GLXContext cx; GLXContext cx;
XEvent event; XEvent event;
/* get a connection */ /* get a connection */
dpy = XOpenDisplay(0); dpy = XOpenDisplay(NULL);
if (dpy == NULL)
{
fprintf(stderr, "XOpenDisplay() returned NULL\n");
return 2;
}
/* get an appropriate visual */ /* get an appropriate visual */
vi = glXChooseVisual(dpy, DefaultScreen(dpy), attributeList); vi = glXChooseVisual(dpy, DefaultScreen(dpy), attributeList);
if (vi == NULL)
{
fprintf(stderr, "glXChooseVisual() returned NULL\n");
return 2;
}
/* create a GLX context */ /* create a GLX context */
cx = glXCreateContext(dpy, vi, 0, GL_FALSE); cx = glXCreateContext(dpy, vi, NULL, GL_TRUE);
if (cx == NULL)
{
fprintf(stderr, "glXCreateContext() returned NULL\n");
return 2;
}
/* create a color map */ /* create a color map */
cmap = XCreateColormap(dpy, RootWindow(dpy, vi->screen), cmap = XCreateColormap(dpy, RootWindow(dpy, vi->screen),
vi->visual, AllocNone); vi->visual, AllocNone);
@ -33,11 +51,19 @@ int main(int argc, char **argv) {
XMapWindow(dpy, win); XMapWindow(dpy, win);
XIfEvent(dpy, &event, WaitForNotify, (char*)win); XIfEvent(dpy, &event, WaitForNotify, (char*)win);
/* connect the context to the window */ /* connect the context to the window */
glXMakeCurrent(dpy, win, cx); if (glXMakeCurrent(dpy, win, cx) == GL_FALSE)
{
fprintf(stderr, "glXMakeCurrent() returned false\n");
return 2;
}
/* clear the buffer */ /* clear the buffer */
glClearColor(1,1,0,1); glClearColor(1,1,0,1);
glClear(GL_COLOR_BUFFER_BIT); glClear(GL_COLOR_BUFFER_BIT);
glFlush(); glFlush();
/* wait a while */ /* wait a while */
sleep(10); sleep(5);
/* teardown */
XFree(vi);
XCloseDisplay(dpy);
} }