x11 window and opengl initialization and drawing of basic quad

2026-10-24 02:12:25 +00:00 · 2023-09-03 00:51:45 +03:00
parent 295f5707fa
commit 2023497beb
16 changed files with 27559 additions and 7 deletions
@@ -0,0 +1,110 @@
+#include <stdio.h>
+
+#include <glad/glx.h>
+
+static const uint win_width = 900;
+static const uint win_height = 900;
+
+Colormap colormap;
+GLXContext context;
+
+void resize_x11_window(Display *display, Window window) {
+  XWindowAttributes win_attrs;
+  XGetWindowAttributes(display, window, &win_attrs);
+  glViewport(0, 0, win_attrs.width, win_attrs.height);
+}
+
+int init_x11(Display **display, Window *window) {
+  *display = XOpenDisplay(NULL);
+
+  if (display == NULL) {
+    fprintf(stderr, "Cannot open display\n");
+    return 1;
+  }
+
+  int screen = DefaultScreen(*display);
+  Window root = RootWindow(*display, screen);
+  Visual *visual = DefaultVisual(*display, screen);
+
+  colormap = XCreateColormap(*display, root, visual, AllocNone);
+
+  XSetWindowAttributes attributes;
+  attributes.event_mask = ExposureMask | KeyPressMask | KeyReleaseMask | StructureNotifyMask;
+  attributes.colormap = colormap;
+
+  *window = XCreateWindow(*display, root, 0, 0, win_width, win_height, 0,
+      DefaultDepth(*display, screen), InputOutput, visual,
+      CWColormap | CWEventMask, &attributes);
+
+  XMapWindow(*display, *window);
+  XStoreName(*display, *window, "Cudoku");
+
+  if (!window) {
+    printf("Failed to create window\n");
+    return 1;
+  }
+
+  int glx_version = gladLoaderLoadGLX(*display, screen);
+
+  if (!glx_version) {
+    printf("Failed to load GLX\n");
+    return 1;
+  }
+  printf("Loaded GLX %d.%d\n",
+      GLAD_VERSION_MAJOR(glx_version), GLAD_VERSION_MINOR(glx_version));
+
+  GLint visual_attributes[] = {
+    GLX_RENDER_TYPE, GLX_RGBA_BIT,
+    GLX_DOUBLEBUFFER, 1,
+    None
+  };
+
+  int num_fbc = 0;
+  GLXFBConfig *fbc =
+    glXChooseFBConfig(*display, screen, visual_attributes, &num_fbc);
+
+  GLint context_attributes[] = {
+    GLX_CONTEXT_MAJOR_VERSION_ARB, 3,
+    GLX_CONTEXT_MINOR_VERSION_ARB, 3,
+    GLX_CONTEXT_PROFILE_MASK_ARB, GLX_CONTEXT_CORE_PROFILE_BIT_ARB,
+    None
+  };
+
+  context = glXCreateContextAttribsARB(*display, fbc[0], NULL, 1,
+      context_attributes);
+
+  if (!context) {
+    printf("Failed to create GLX context\n");
+    return 1;
+  }
+
+  glXMakeCurrent(*display, *window, context);
+
+  int gl_version = gladLoaderLoadGL();
+
+  if (!gl_version) {
+    printf("Failed to load GL\n");
+    return 1;
+  }
+  printf("Loaded GL %d.%d\n",
+      GLAD_VERSION_MAJOR(gl_version), GLAD_VERSION_MINOR(gl_version));
+
+  XWindowAttributes win_attrs;
+  XGetWindowAttributes(*display, *window, &win_attrs);
+  glViewport(0, 0, win_attrs.width, win_attrs.height);
+  resize_x11_window(*display, *window);
+
+  return 0;
+}
+
+void close_x11(Display **display, Window *window) {
+  glXMakeCurrent(*display, 0, 0);
+  glXDestroyContext(*display, context);
+
+  XDestroyWindow(*display, *window);
+  XFreeColormap(*display, colormap);
+  XCloseDisplay(*display);
+
+  gladLoaderUnloadGLX();
+}
+