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use indirect context, added error checking

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This commit is contained in:
Brian Paul 2000-07-11 16:05:29 +00:00
parent c4266ac71e
commit fb88eeee9f
1 changed files with 53 additions and 27 deletions
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80
progs/xdemos/glxpixmap.c
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@ -1,4 +1,4 @@
/* $Id: glxpixmap.c,v 1.1 1999/08/19 00:55:43 jtg Exp $ */
/* $Id: glxpixmap.c,v 1.2 2000/07/11 16:05:29 brianp Exp $ */
/*
@ -9,16 +9,11 @@
*/
/*
* $Id: glxpixmap.c,v 1.1 1999/08/19 00:55:43 jtg Exp $
*/
#include <GL/gl.h>
#include <GL/glx.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
static GLXContext ctx;
@ -30,11 +25,17 @@ static GC gc;
static Window make_rgb_window( Display *dpy,
unsigned int width, unsigned int height )
{
int attrib[] = { GLX_RGBA,
GLX_RED_SIZE, 1,
GLX_GREEN_SIZE, 1,
GLX_BLUE_SIZE, 1,
None };
const int sbAttrib[] = { GLX_RGBA,
GLX_RED_SIZE, 1,
GLX_GREEN_SIZE, 1,
GLX_BLUE_SIZE, 1,
None };
const int dbAttrib[] = { GLX_RGBA,
GLX_RED_SIZE, 1,
GLX_GREEN_SIZE, 1,
GLX_BLUE_SIZE, 1,
GLX_DOUBLEBUFFER,
None };
int scrnum;
XSetWindowAttributes attr;
unsigned long mask;
@ -44,10 +45,13 @@ static Window make_rgb_window( Display *dpy,
scrnum = DefaultScreen( dpy );
root = RootWindow( dpy, scrnum );
visinfo = glXChooseVisual( dpy, scrnum, attrib );
visinfo = glXChooseVisual( dpy, scrnum, (int *) sbAttrib );
if (!visinfo) {
printf("Error: couldn't get an RGB, Double-buffered visual\n");
exit(1);
visinfo = glXChooseVisual( dpy, scrnum, (int *) dbAttrib );
if (!visinfo) {
printf("Error: couldn't get an RGB visual\n");
exit(1);
}
}
/* window attributes */
@ -65,20 +69,33 @@ static Window make_rgb_window( Display *dpy,
/* make an X GC so we can do XCopyArea later */
gc = XCreateGC( dpy, win, 0, NULL );
ctx = glXCreateContext( dpy, visinfo, NULL, True );
/* need indirect context */
ctx = glXCreateContext( dpy, visinfo, NULL, False );
if (!ctx) {
printf("Error: glXCreateContext failed\n");
exit(-1);
}
printf("Direct rendering: %s\n", glXIsDirect(dpy, ctx) ? "Yes" : "No");
return win;
}
static GLXPixmap make_pixmap( Display *dpy, Window win,
unsigned int width, unsigned int height )
unsigned int width, unsigned int height,
Pixmap *pixmap)
{
Pixmap pm;
GLXPixmap glxpm;
XWindowAttributes attr;
pm = XCreatePixmap( dpy, win, width, height, visinfo->depth );
if (!pm) {
printf("Error: XCreatePixmap failed\n");
exit(-1);
}
XGetWindowAttributes( dpy, win, &attr );
/*
@ -89,12 +106,25 @@ static GLXPixmap make_pixmap( Display *dpy, Window win,
* into any kind of visual, not just TrueColor or DirectColor.
*/
#ifdef GLX_MESA_pixmap_colormap
glxpm = glXCreateGLXPixmapMESA( dpy, visinfo, pm, attr.colormap );
if (strstr(glXQueryExtensionsString(dpy, 0), "GLX_MESA_pixmap_colormap")) {
/* stand-alone Mesa, specify the colormap */
glxpm = glXCreateGLXPixmapMESA( dpy, visinfo, pm, attr.colormap );
}
else {
glxpm = glXCreateGLXPixmap( dpy, visinfo, pm );
}
#else
/* This will work with Mesa too if the visual is TrueColor or DirectColor */
glxpm = glXCreateGLXPixmap( dpy, visinfo, pm );
#endif
if (!glxpm) {
printf("Error: GLXCreateGLXPixmap failed\n");
exit(-1);
}
*pixmap = pm;
return glxpm;
}
@ -128,18 +158,16 @@ int main( int argc, char *argv[] )
{
Display *dpy;
Window win;
GLXPixmap pm;
Pixmap pm;
GLXPixmap glxpm;
dpy = XOpenDisplay(NULL);
win = make_rgb_window( dpy, 300, 300 );
pm = make_pixmap( dpy, win, 300, 300 );
glxpm = make_pixmap( dpy, win, 300, 300, &pm );
#ifdef JUNK
glXMakeCurrent( dpy, win, ctx ); /*to make sure ctx is properly initialized*/
#endif
glXMakeCurrent( dpy, pm, ctx );
glXMakeCurrent( dpy, glxpm, ctx );
printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
/* Render an image into the pixmap */
glShadeModel( GL_FLAT );
@ -151,8 +179,6 @@ int main( int argc, char *argv[] )
glRectf( -0.75, -0.75, 0.75, 0.75 );
glFlush();
/* when a redraw is needed we'll just copy the pixmap image to the window */
XMapWindow( dpy, win );
event_loop( dpy, pm );