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// gcc example/c/glx.c -o build/glx -Ibuild/include build/src/*.c -ldl -lX11
#include <stdio.h>
#include <stdbool.h>
#include <unistd.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <glad/gl.h>
#include <glad/glx.h>
const int window_width = 800, window_height = 480;
int main(void) {
Display *display = XOpenDisplay(NULL);
if (display == NULL) {
printf("cannot connect to X server\n");
return 1;
}
int screen = DefaultScreen(display);
int glx_version = gladLoaderLoadGLX(display, screen);
if (!glx_version) {
printf("Unable to load GLX.\n");
return 1;
}
printf("Loaded GLX %d.%d\n", GLAD_VERSION_MAJOR(glx_version), GLAD_VERSION_MINOR(glx_version));
Window root = RootWindow(display, screen);
GLint visual_attributes[] = { GLX_RGBA, GLX_DOUBLEBUFFER, None };
XVisualInfo *visual_info = glXChooseVisual(display, screen, visual_attributes);
Colormap colormap = XCreateColormap(display, root, visual_info->visual, AllocNone);
XSetWindowAttributes attributes;
attributes.event_mask = ExposureMask | KeyPressMask | KeyReleaseMask;
attributes.colormap = colormap;
Window window =
XCreateWindow(display, root, 0, 0, window_width, window_height, 0,
visual_info->depth, InputOutput, visual_info->visual,
CWColormap | CWEventMask, &attributes);
XMapWindow(display, window);
XStoreName(display, window, "[glad] GLX with X11");
if (!window) {
printf("Unable to create window.\n");
return 1;
}
GLXContext context = glXCreateContext(display, visual_info, NULL, GL_TRUE);
glXMakeCurrent(display, window, context);
int gl_version = gladLoaderLoadGL();
if (!gl_version) {
printf("Unable to load GL.\n");
return 1;
}
printf("Loaded GL %d.%d\n", GLAD_VERSION_MAJOR(gl_version), GLAD_VERSION_MINOR(gl_version));
XWindowAttributes gwa;
XGetWindowAttributes(display, window, &gwa);
glViewport(0, 0, gwa.width, gwa.height);
bool quit = false;
while (!quit) {
while (XPending(display)) {
XEvent xev;
XNextEvent(display, &xev);
if (xev.type == KeyPress) {
quit = true;
}
}
glClearColor(0.8, 0.6, 0.7, 1.0);
glClear(GL_COLOR_BUFFER_BIT);
glXSwapBuffers(display, window);
usleep(1000 * 10);
}
glXMakeCurrent(display, 0, 0);
glXDestroyContext(display, context);
XDestroyWindow(display, window);
XFreeColormap(display, colormap);
XCloseDisplay(display);
gladLoaderUnloadGLX();
}
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