add support for ultrawide displays (#13)

This change includes fixes in the underlying engine that support
non-16:9 aspect ratios.

Author: shawnhatori

3d_model_viewer.c

@@ -73,7 +73,7 @@ typedef struct
     pg_camera camera;    // align: 4
 } application_state;
 
-GLOBAL pg_config config = {.input_gamepad_count = 1,
+GLOBAL pg_config config = {.gamepad_count = 1,
                            .input_repeat_rate = 750.0f,
                            .fixed_time_step = (1.0f / 480.0f) * PG_MS_IN_S,
                            .permanent_mem_size = 1250u * PG_MEBIBYTE,
@@ -268,6 +268,7 @@ FUNCTION void
 update_app(pg_assets* assets,
            pg_input* input,
            pg_f32_2x previous_cursor_position,
+           pg_f32_2x render_res,
            pg_mesh** meshes,
            u32* mesh_count,
            pg_dynamic_cb_data* dynamic_cb_data,
@@ -376,17 +377,17 @@ update_app(pg_assets* assets,
 
     pg_f32_4x4 world_from_model
         = pg_f32_4x4_world_from_model(model_scaling[app_state.art_id],
-                                       app_state.rotation,
-                                       (pg_f32_3x){0});
+                                      app_state.rotation,
+                                      (pg_f32_3x){0});
     pg_f32_4x4 view_from_world
         = pg_f32_4x4_view_from_world(camera_position,
                                      app_state.camera.focal_point,
                                      app_state.camera.up_axis);
-    pg_f32_4x4 clip_from_view
-        = pg_f32_4x4_clip_from_view_perspective(27.0f,
-                                                16.0f / 9.0f,
-                                                0.1f,
-                                                100.0f);
+    pg_f32_4x4 clip_from_view = pg_f32_4x4_clip_from_view_perspective(
+        27.0f,
+        render_res.width / render_res.height,
+        0.1f,
+        100.0f);
 
     pg_assets_get_meshes(assets,
                          &app_state.art_id,
@@ -470,6 +471,7 @@ wWinMain(HINSTANCE inst, HINSTANCE prev_inst, WCHAR* cmd_args, s32 show_code)
         update_app(&assets,
                    &windows.input,
                    previous_cursor_position,
+                   windows.window.render_res,
                    &meshes,
                    &mesh_count,
                    &dynamic_cb_data,

README.md

@@ -31,6 +31,7 @@ download and run the application.
 * Arcball camera (camera is rotated on a sphere around the model)
 * Mouse/keyboard and gamepad controls for model selection, rotation, zoom, etc.
 * UI for displaying model names, performance metrics, etc.
+* Ultrawide support
 
 ## Models
 The included 3D models are processed from their original glTF 2.0 binary format