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/* oglinfo.c */
/* This demo modified by BrianP to accomodate Mesa and test
* the GLX 1.1 functions.
*/
#include <GL/gl.h>
#include <GL/glx.h>
#include <GL/glu.h>
#include <stdio.h>
#include <string.h>
int visual_request0[] = { None }; /* don't need much of a visual */
int visual_request1[] = { GLX_RGBA, None }; /* in case CI failed */
int main(int argc, char **argv)
{
char *display_name = NULL;
char *string;
Display *dpy;
int screen_num;
int major, minor;
XVisualInfo *vis;
GLXContext ctx;
Window root, win;
Colormap cmap;
XSetWindowAttributes swa;
int dontcare;
/* parse arguments */
if(argc > 1) {
if(!strcmp(argv[1],"-display"))
display_name = argv[2];
else {
fprintf(stderr, "Usage: %s [-display <display>]\n",argv[0]);
return 0;
}
}
/* get display */
if (!(dpy = XOpenDisplay(display_name))) {
fprintf(stderr,"Error: XOpenDisplay() failed.\n");
return 1;
}
/* does the server know about OpenGL & GLX? */
#ifndef MESA
if(!XQueryExtension(dpy, "GLX", &dontcare, &dontcare, &dontcare)) {
fprintf(stderr,"This system doesn't appear to support OpenGL\n");
return 1;
}
#else
(void) dontcare;
#endif
/* find the glx version */
if(glXQueryVersion(dpy, &major, &minor))
printf("GLX Version: %d.%d\n", major, minor);
else {
fprintf(stderr, "Error: glXQueryVersion() failed.\n");
return 1;
}
/* get screen number */
screen_num = DefaultScreen(dpy);
/* This #ifdef isn't redundant. It keeps the build from breaking
** if you are building on a machine that has an old (1.0) version
** of glx.
**
** This program could still be *run* on a machine that has an old
** version of glx, even if it was *compiled* on a version that has
** a new version.
**
** If compiled on a system with an old version of glx, then it will
** never recognize glx extensions, since that code would have been
** #ifdef'ed out.
*/
#ifdef GLX_VERSION_1_1
/*
** This test guarantees that glx, on the display you are inquiring,
** suppports glXQueryExtensionsString().
*/
if(minor > 0 || major > 1)
string = (char *) glXQueryExtensionsString(dpy, screen_num);
else
string = "";
if(string)
printf("GLX Extensions (client & server): %s\n",
string);
else {
fprintf(stderr, "Error: glXQueryExtensionsString() failed.\n");
return 1;
}
if (minor>0 || major>1) {
printf("glXGetClientString(GLX_VENDOR): %s\n", glXGetClientString(dpy,GLX_VENDOR));
printf("glXGetClientString(GLX_VERSION): %s\n", glXGetClientString(dpy,GLX_VERSION));
printf("glXGetClientString(GLX_EXTENSIONS): %s\n", glXGetClientString(dpy,GLX_EXTENSIONS));
printf("glXQueryServerString(GLX_VENDOR): %s\n", glXQueryServerString(dpy,screen_num,GLX_VENDOR));
printf("glXQueryServerString(GLX_VERSION): %s\n", glXQueryServerString(dpy,screen_num,GLX_VERSION));
printf("glXQueryServerString(GLX_EXTENSIONS): %s\n", glXQueryServerString(dpy,screen_num,GLX_EXTENSIONS));
}
#endif
/* get any valid OpenGL visual */
if (!(vis = glXChooseVisual(dpy, screen_num, visual_request0))) {
if (!(vis = glXChooseVisual(dpy, screen_num, visual_request1))) {
fprintf(stderr,"Error: glXChooseVisual() failed.\n");
return 1;
}
}
/* get context */
ctx = glXCreateContext(dpy,vis,0,GL_TRUE);
/* root window */
root = RootWindow(dpy,vis->screen);
/* get RGBA colormap */
cmap = XCreateColormap(dpy, root, vis->visual, AllocNone);
/* get window */
swa.colormap = cmap;
swa.border_pixel = 0;
swa.event_mask = StructureNotifyMask;
win = XCreateWindow(dpy, root, 0, 0, 1, 1, 0, vis->depth,
InputOutput,vis->visual,
CWBorderPixel|CWColormap|CWEventMask,
&swa);
glXMakeCurrent(dpy,win,ctx);
string = (char *) glGetString(GL_VERSION);
if(string)
#ifdef MESA
printf("Mesa Version: %s\n", string);
#else
printf("OpenGL Version: %s\n", string);
#endif
else {
fprintf(stderr, "Error: glGetString(GL_VERSION) failed.\n");
return 1;
}
string = (char *) glGetString(GL_EXTENSIONS);
if(string)
#ifdef MESA
printf("Mesa Extensions: %s\n", string);
#else
printf("OpenGL Extensions: %s\n", string);
#endif
else {
fprintf(stderr, "Error: glGetString(GL_EXTENSIONS) failed.\n");
return 1;
}
string = (char *) glGetString(GL_RENDERER);
if(string)
#ifdef MESA
printf("Mesa Renderer: %s\n", string);
#else
printf("OpenGL renderer: %s\n", string);
#endif
else {
fprintf(stderr, "Error: glGetString(GL_RENDERER) failed.\n");
return 1;
}
/*
** This #ifdef prevents a build failure if you compile on an a
** machine with an old GLU library.
**
** If you build on a pre GLU 1.1 machine, you will never be able
** to get glu info, even if you run on a GLU 1.1 or latter machine,
** since the code has been #ifdef'ed out.
*/
#ifdef GLU_VERSION_1_1
/*
** If the glx version is 1.1 or latter, gluGetString() is guaranteed
** to exist.
*/
if(minor > 0 || major > 1)
string = (char *) gluGetString(GLU_VERSION);
else
string = "1.0";
if(string)
printf("GLU Version: %s\n", string);
else {
fprintf(stderr, "Error: gluGetString(GLU_VERSION) failed.\n");
return 1;
}
if(minor > 0 || major > 1)
string = (char *) gluGetString(GLU_EXTENSIONS);
else
string = "";
if(string)
printf("GLU Extensions: %s\n", string);
else {
fprintf(stderr, "Error: gluGetString(GLU_EXTENSIONS) failed.\n");
return 1;
}
#endif
return 0;
}
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