[x11-standalone]

x11.c

@@ -0,0 +1,134 @@
+#if 0
+mkdir -p build
+clang -o build/demo -g x11.c -lX11
+exit 0
+#endif
+
+/*
+** Reading From:
+** (1) xlib manual    https://tronche.com/gui/x/xlib/
+*/
+
+#include <X11/Xlib.h>
+
+#include <stdio.h>
+
+int main(int argc, char **argv){
+  /* (1) /display/opening.html
+  ** " The XOpenDisplay() function returns a Display structure that serves
+  **   as the connection to the X server and that contains all the 
+  **   information about that X server. "
+  */
+  Display *display = XOpenDisplay(0);
+  if (display == 0){
+    printf("XOpenDisplay failed\n");
+  }
+  
+  /* (1) /window-information/XInternAtom.html
+  ** " returns the atom identifier associated with the specified 
+  **   atom_name string "
+  */
+  Atom atom__WM_DELETE_WINDOW = XInternAtom(display, "WM_DELETE_WINDOW", False);
+  
+  /* (1) /window/XCreateWindow.html
+  ** " The XCreateWindow function creates an unmapped subwindow for a 
+  **   specified parent window "
+  */
+  Window window = 0;
+  if (display != 0){
+    Window parent = DefaultRootWindow(display);
+    int x = 0;
+    int y = 0;
+    int w = 640;
+    int h = 480;
+    int border_width = 0;
+    int depth = CopyFromParent;
+    unsigned int xclass = InputOutput;
+    Visual *visual = CopyFromParent;
+    unsigned long valuemask = CWEventMask;
+    
+    XSetWindowAttributes attributes = {0};
+    attributes.event_mask = StructureNotifyMask;
+    
+    window = XCreateWindow(display, parent, x, y, w, h, border_width,
+                           depth, xclass, visual, valuemask,
+                           &attributes);
+    
+    if (window == 0){
+      printf("XCreateWindow failed\n");
+    }
+  }
+  
+  /* (1) /ICC/client-to-window-manager/XStoreName.html
+  ** " assigns the name passed to window_name to the specified window "
+  */
+  XStoreName(display, window, "Example Window");
+  
+  /* (1) /window/XMapWindow.html
+  ** " maps the window and all of its subwindows that have had map requests "
+  **~ NOTE: This makes the window visible on the screen.
+  */
+  XMapWindow(display, window);
+  
+  /*~ NOTE: Main loop */
+  int exit_loop = 0;
+  for (;!exit_loop;){
+    
+    /* (1) /event-handling/XPending.html
+    ** " returns the number of events that have been received from the X
+    **   server but have not been removed from the event queue "
+    **~ NOTE: The docs say this returns the number of events, but in
+    **   since that number could grow as we process inputs, so it's more
+    **   usually used as a way to check if there is at least one input.
+    */
+    for (;XPending(display) > 0;){
+      /* (1) /event-handling/manipulating-event-queue/XNextEvent.html
+      ** " copies the first event from the event queue into the specified
+      **   XEvent structure and then removes it from the queue "
+      */
+      XEvent event;
+      XNextEvent(display, &event);
+      
+      /* (1) /events/structures.html
+      ** " The XEvent structure is a union of the individual structures 
+      **   declared for each event type. Depending on the type, you should
+      **   access members of each event by using the XEvent union. "
+      */
+      switch (event.type){
+        case ClientMessage: {
+          Atom atom = event.xclient.data.l[0];
+          if (atom == atom__WM_DELETE_WINDOW){
+            exit_loop = 1;
+          }
+        }break;
+      }
+    }
+    
+    /* (1) /window-information/XGetWindowAttributes.html
+    ** " returns the current attributes for the specified window "
+    */
+    XWindowAttributes window_attr = {0};
+    if (!XGetWindowAttributes(display, window, &window_attr)){
+      printf("XGetWindowAttributes failed\n");
+    }
+  }
+  
+  /*~ NOTE: Shutdown */
+  
+  /* (1) /window/XDestroyWindow.html
+  ** " destroys the specified window as well as all of its subwindows "
+  */
+  if (display != 0 && window != 0){
+    XDestroyWindow(display, window);
+  }
+  
+  /* (1) /display/closing.html
+  ** " To close a display or disconnect from the X server, use
+  **   XCloseDisplay(). "
+  */
+  if (display != 0){
+    XCloseDisplay(display);
+  }
+  
+  return(0);
+}

x11_egl.c

@@ -24,7 +24,6 @@ X(glViewport, void, (GLint x, GLint y, GLsizei w, GLsizei h)) \
 X(glClear, void, (GLbitfield mask)) \
 X(glClearColor, void, (GLfloat r, GLfloat g, GLfloat b, GLfloat a))
 
-
 #define X(N,R,P) R (*N)P = 0;
 GL_FUNCS_XLIST(X)
 #undef X