create initial opengl renderer

src/import.ml

@@ -15,6 +15,4 @@ module Sdl = struct
   let gl_set_swap_interval_exn i = gl_set_swap_interval i |> or_exn
 end
 
-module Gl = struct
-  include Tgl4.Gl
-end
+include (val Ohlog.logs "Geom")

src/main.ml

@@ -1,51 +1,51 @@
 open! Import
-
-include (val Ohlog.logs "main")
+include (val Ohlog.sublogs logger "Main")
 
 exception Quit
 
 let main () =
-  info (fun m -> m "initializing");
-
-  let flags = Sdl.Window.(shown + opengl + resizable) in
+  debug (fun m -> m "initializing");
+  let flags = Sdl.Window.(opengl + resizable - shown) in
   let window =
     Sdl.create_window_exn
       ~w:1024 ~h:800
-      "Geometra"
+      "GEOMETRA"
       flags
   in
+  info (fun m -> m "window initialized");
+
+  let ren = Renderer.make ~window in
+  info (fun m -> m "renderer initialized");
+
+  try
     let event = Sdl.Event.create () in
     let some_event = Some event in
 
-  let ogl = Sdl.gl_create_context_exn window in
-  Sdl.gl_make_current_exn window ogl;
-  Sdl.gl_set_swap_interval_exn 1;
+    Sdl.show_window window;
 
-  begin
-    Gl.clear_color 1. 0. 1. 1.;
-  end;
-
-  info (fun m -> m "initialized");
-  try
     while true do
       while Sdl.poll_event some_event do
         match Sdl.Event.(get event typ |> enum) with
         | `Quit -> raise_notrace Quit
         | _ ->
-          trace (fun m -> m "uncaught event (%d)" (Sdl.Event.(get event typ)));
-          ()
+          trace (fun m -> m "uncaught event (%d)" Sdl.Event.(get event typ))
       done;
 
       (* let time = Sdl.get_ticks () |> Int32.to_int in *)
-      Gl.clear Gl.color_buffer_bit;
-      Sdl.gl_swap_window window;
+      Renderer.pre_draw ren;
+      Renderer.clear ren (rgb24 0xff8833);
+      Renderer.post_draw ren;
     done
   with Quit ->
-    ()
+    begin
+      info (fun m -> m "quitting");
+    end
 
 
 let () =
   Ohlog.init () ~min_level:DEBUG;
+
   try main () with
-  | Sdl.Error msg -> error (fun m -> m "%s" msg)
-  | Failure msg -> error (fun m -> m "failure: %s" msg)
+  | Failure msg -> error (fun m -> m "%s" msg)
+  | Sdl.Error msg -> error (fun m -> m "SDL error: %s" msg)
+  | Asset.Error (path, msg) -> error (fun m -> m "failed to load %S: %s" path msg)

src/renderer.ml

@@ -0,0 +1,38 @@
+open! Import
+include (val Ohlog.sublogs logger "Ren")
+
+type t = {
+  window : Sdl.window;
+  gl_ctx : Sdl.gl_context;
+}
+
+let make ~(window : Sdl.window) : t =
+  debug (fun m -> m "initializing");
+  let gl_ctx = Sdl.gl_create_context_exn window in
+  Sdl.gl_make_current_exn window gl_ctx;
+  Sdl.gl_set_swap_interval_exn 1;
+
+  {
+    window;
+    gl_ctx;
+  }
+
+let destroy t =
+  Sdl.gl_delete_context t.gl_ctx
+
+let pre_draw t =
+  begin
+    Sdl.gl_make_current_exn t.window t.gl_ctx;
+    (* let size = Sdl.get_window_size t.window in *)
+  end
+
+let clear (_t : t) (bg : color) =
+  begin
+    Gl.clear_color bg.r bg.g bg.b bg.a;
+    Gl.clear Gl.color_buffer_bit;
+  end
+
+let post_draw t =
+  begin
+    Sdl.gl_swap_window t.window;
+  end