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