add some jtk window functions

src/jes/gui/jtk.c

@@ -1,6 +1,9 @@
-#include <GL/glx.h>
 #include <stdio.h>
 #include <stdbool.h>
+#include <string.h>
+#include <stdlib.h>
+#include <GL/glx.h>
+#include <X11/Xatom.h>
 
 static Display * g_display;
 static XVisualInfo * g_vi;
@@ -52,3 +55,87 @@ bool jtk_init()
 
     return true;
 }
+
+static Bool wait_for_notify(Display * display, XEvent * event, XPointer arg)
+{
+    return (event->type == MapNotify) && (event->xmap.window == (Window)arg);
+}
+
+void * jtk_window_create()
+{
+    XEvent event;
+    Window window = XCreateWindow(g_display,
+            RootWindow(g_display, g_vi->screen),
+            0, 0, 800, 800, 0, g_vi->depth, InputOutput, g_vi->visual,
+            CWBorderPixel | CWColormap | CWEventMask, &g_swa);
+    XMapWindow(g_display, window);
+    XIfEvent(g_display, &event, wait_for_notify, (XPointer)window);
+    if (glXMakeCurrent(g_display, window, g_context) == False)
+    {
+        fprintf(stderr, "glXMakeCurrent() failure\n");
+        XDestroyWindow(g_display, window);
+        return NULL;
+    }
+
+    /* Disable the window close button. */
+    Atom wm_delete_window_atom = XInternAtom(g_display, "WM_DELETE_WINDOW", False);
+    XSetWMProtocols(g_display, window, &wm_delete_window_atom, 1);
+
+    return (void *)window;
+}
+
+void jtk_window_swap_buffers(void * window)
+{
+    glXSwapBuffers(g_display, (Window)window);
+}
+
+void jtk_window_close(void * window)
+{
+    XDestroyWindow(g_display, (Window)window);
+}
+
+void jtk_window_set_title(void * window, const char * title)
+{
+    XTextProperty title_property;
+    if (XStringListToTextProperty((char **)&title, 1, &title_property) != 0)
+    {
+        XSetTextProperty(g_display, (Window)window, &title_property, XA_WM_NAME);
+        XFree(title_property.value);
+    }
+}
+
+/**
+ * Set the window icon.
+ *
+ * @param window
+ *   The window to operate on.
+ * @param data
+ *   The format of data must be 32 bits per pixel in BGRA format (e.g. data[0]
+ *   is blue value, data[3] is alpha value of first pixel).
+ * @param width
+ *   Icon width.
+ * @param height
+ *   Icon height.
+ */
+void jtk_window_set_icon(void * window, const uint8_t * data,
+        size_t width, size_t height)
+{
+    Atom net_wm_icon_atom = XInternAtom(g_display, "_NET_WM_ICON", False);
+    size_t property_size = (2u + width * height) * sizeof(long);
+    unsigned long * property_data = (unsigned long *)malloc(property_size);
+    property_data[0] = width;
+    property_data[1] = height;
+    unsigned long * dest = &property_data[2];
+    const uint32_t * src = (const uint32_t *)data;
+    for (size_t row = 0u; row < height; row++)
+    {
+        for (size_t col = 0u; col < width; col++)
+        {
+            *dest++ = *src++;
+        }
+    }
+    XChangeProperty(g_display, (Window)window, net_wm_icon_atom, XA_CARDINAL,
+            32, PropModeReplace, (uint8_t *)property_data, property_size);
+    XFlush(g_display);
+    free(property_data);
+}

src/jes/gui/jtk.d

@@ -1,4 +1,10 @@
 private extern(C) bool jtk_init();
+private extern(C) void * jtk_window_create();
+private extern(C) void jtk_window_swap_buffers(void * window);
+private extern(C) void jtk_window_close(void * window);
+private extern(C) void jtk_window_set_title(void * window, const char * title);
+private extern(C) void jtk_window_set_icon(void * window, const ubyte * data,
+        size_t width, size_t height);
 
 struct Jtk
 {