UI windows

ui/ui.jai

@@ -1,5 +1,6 @@
 MAX_VERT_BUFFERS :: 64;
 MAX_BOXES :: 4096;
+MAX_WINDOWS :: 128;
 
 UI_Box_Flags :: enum_flags u32 {
     NONE                :: 0;
@@ -49,6 +50,7 @@ UI_Box :: struct {
     hash: u32;
     last_used_frame_index: u64;
 
+    root_for_window: *UI_Window;
     parent: *UI_Box;
     first_child: *UI_Box;
     last_child: *UI_Box;
@@ -129,12 +131,25 @@ Textured_Vert_Buffer :: struct {
     verts: [6] Textured_Vert;
 }
 
+UI_Window :: struct {
+    hash: u32;
+    root: *UI_Box;
+
+    title: string;
+    position: Vector2;
+    size: Vector2;
+
+    last_used_frame_index: u64;
+}
+
 UI_State :: struct {
     begun: bool;
     frame_index: u64;
 
 	root: *UI_Box;
     boxes: Table(u32, UI_Box);
+    windows: Table(u32, UI_Window);
+    current_window: *UI_Window;
 
     last_box: *UI_Box;
 
@@ -171,6 +186,22 @@ UI_State :: struct {
 
 ui_state : UI_State;
 
+ui_window_make :: (title: string, hash: u32) -> *UI_Window {
+    window := get_ui_window_or_create_new(hash);
+    return window;
+}
+
+ui_window_begin :: (title: string, identifier: s64 = 0, loc := #caller_location) {
+    assert(ui_state.current_window == null);
+
+    ui_state.current_window = ui_window_make(title, hash=get_hash(loc, identifier));
+    ui_state.current_window.last_used_frame_index = ui_state.frame_index;
+}
+
+ui_window_end :: () {
+    ui_state.current_window = null;
+}
+
 ui_box :: (flags: UI_Box_Flags, identifier: s64 = 0, loc := #caller_location) -> *UI_Box {
     return ui_box_make(flags, hash=get_hash(loc, identifier));
 }
@@ -194,6 +225,15 @@ ui_box_make :: (flags: UI_Box_Flags, hash: u32) -> *UI_Box {
     box.num_children = 0;
     box.flags = flags;
     box.parent = null;
+    box.root_for_window = null;
+
+    if ui_state.current_window {
+        if ui_state.current_window.root == null {
+            ui_state.current_window.root = box;
+            box.root_for_window = ui_state.current_window;
+        }
+    }
+
 
 	// Set the links
 	box.parent = parent;
@@ -728,9 +768,24 @@ get_ui_box_or_create_new :: (hash: u32) -> *UI_Box, bool {
 
     ptr.hash = hash;
 
-    return ptr, false;
+
+
+   return ptr, false;
 }
 
+get_ui_window_or_create_new :: (hash: u32) -> *UI_Window, bool {
+    ptr := table_find_pointer(*ui_state.windows, hash);
+
+    if ptr == null {
+        assert(ui_state.windows.count < MAX_WINDOWS);
+        table_add(*ui_state.windows, hash, .{});
+        ptr = table_find_pointer(*ui_state.windows, hash);
+    }
+
+    ptr.hash = hash;
+
+   return ptr, false;
+}
 // #### RENDERING
 make_vert :: (x: float, y: float, color: Color) -> Colored_Vert {
     vert : Colored_Vert;