Plugin refactor, moving scene from game to plugin.

1 files changed, 83 insertions, 55 deletions

diff --git a/gltfview/src/game.c b/gltfview/src/game.c
index c331190..64be4f3 100644
--- a/gltfview/src/game.c
+++ b/gltfview/src/game.c
@@ -39,6 +39,78 @@ static const int WIDTH   = 1350;
 static const int HEIGHT  = 900;
 static const int MAX_FPS = 60;
 
+/// Initialize the game's plugin.
+static bool init_plugin(Game* game) {
+  assert(game);
+  assert(game->plugin);
+  // Plugin state is allowed to be null, either when the plugin does not
+  // expose an init() or when init() does not initialize a state.
+  if (plugin_resolve(game->plugin, plugin_init, "init")) {
+    State* plugin_state = 0;
+    if (!plugin_call(game->plugin, plugin_init, "init", game, &plugin_state)) {
+      return false;
+    }
+    set_plugin_state(game->plugin, plugin_state);
+  }
+  return true; // Plugin does not need to expose an init().
+}
+
+/// Shutdown the game's plugin.
+/// The game's plugin is allowed to be null in the call to this function.
+static void shutdown_plugin(Game* game) {
+  assert(game);
+  if (game->plugin &&
+      (plugin_resolve(game->plugin, plugin_shutdown, "shutdown"))) {
+    void* plugin_state = get_plugin_state(game->plugin);
+    plugin_call(game->plugin, plugin_shutdown, "shutdown", game, plugin_state);
+    set_plugin_state(game->plugin, 0);
+  }
+}
+
+/// Boot the game's plugin.
+static bool boot_plugin(Game* game) {
+  assert(game);
+  assert(game->plugin);
+  if (plugin_resolve(game->plugin, plugin_boot, "boot")) {
+    void* plugin_state = get_plugin_state(game->plugin);
+    return plugin_call(game->plugin, plugin_boot, "boot", game, plugin_state);
+  }
+  return true; // Plugin does not need to expose a boot().
+}
+
+/// Update the plugin's state.
+static void update_plugin(Game* game, double t, double dt) {
+  assert(game);
+  assert(game->plugin);
+  if (plugin_resolve(game->plugin, plugin_update, "update")) {
+    void* plugin_state = get_plugin_state(game->plugin);
+    plugin_call(
+        game->plugin, plugin_update, "update", game, plugin_state, t, dt);
+  }
+}
+
+/// Plugin render.
+static void render_plugin(const Game* game) {
+  assert(game);
+  assert(game->plugin);
+  if (plugin_resolve(game->plugin, plugin_render, "render")) {
+    void* plugin_state = get_plugin_state(game->plugin);
+    plugin_call(game->plugin, plugin_render, "render", game, plugin_state);
+  }
+}
+
+/// Plugin resize.
+static void resize_plugin(Game* game, int width, int height) {
+  assert(game);
+  assert(game->plugin);
+  if (plugin_resolve(game->plugin, plugin_resize, "resize")) {
+    void* plugin_state = get_plugin_state(game->plugin);
+    plugin_call(
+        game->plugin, plugin_resize, "resize", game, plugin_state, width,
+        height);
+  }
+}
+
 void app_end(Game* game);
 
 bool app_init(const GfxAppDesc* desc, void** app_state) {
@@ -88,30 +160,14 @@ bool app_init(const GfxAppDesc* desc, void** app_state) {
   if (!(game->gfx = gfx_init())) {
     goto cleanup;
   }
-  if (!(game->scene = gfx_make_scene())) {
+
+  if (!init_plugin(game)) {
     goto cleanup;
   }
-  if (!(game->camera = gfx_make_camera())) {
+  if (!boot_plugin(game)) {
     goto cleanup;
   }
 
-  if (plugin_resolve(game->plugin, plugin_init, "init")) {
-    void* plugin_state = plugin_call(game->plugin, plugin_init, "init", game);
-    if (!plugin_state) {
-      goto cleanup;
-    }
-    set_plugin_state(game->plugin, plugin_state);
-  }
-
-  if (plugin_resolve(game->plugin, plugin_boot, "boot")) {
-    void* plugin_state = get_plugin_state(game->plugin);
-    bool  boot_success =
-        plugin_call(game->plugin, plugin_boot, "boot", plugin_state, game);
-    if (!boot_success) {
-      goto cleanup;
-    }
-  }
-
   *app_state = game;
   return true;
 
@@ -123,6 +179,7 @@ cleanup:
 
 void app_end(Game* game) {
   assert(game);
+  shutdown_plugin(game);
   if (game->gfx) {
     gfx_destroy(&game->gfx);
   }
@@ -136,53 +193,24 @@ void app_end(Game* game) {
 
 void app_update(Game* game, double t, double dt) {
   plugin_engine_update(game->plugin_engine);
-  if (plugin_reloaded(game->plugin) &&
-      plugin_resolve(game->plugin, plugin_init, "init")) {
-    void* plugin_state = plugin_call(game->plugin, plugin_init, "init", game);
-    assert(plugin_state); // TODO: handle error better.
-    set_plugin_state(game->plugin, plugin_state);
+  if (plugin_reloaded(game->plugin)) {
+    shutdown_plugin(game);
+    const bool result = init_plugin(game);
+    assert(result); // TODO: handle error better.
   }
 
-  if (plugin_resolve(game->plugin, plugin_update, "update")) {
-    // Plugin state may be null if plugin does not expose init().
-    void* plugin_state = get_plugin_state(game->plugin);
-    plugin_call(
-        game->plugin, plugin_update, "update", plugin_state, game, t, dt);
-  }
+  update_plugin(game, t, dt);
 }
 
 void app_render(const Game* game) {
   RenderBackend* render_backend = gfx_get_render_backend(game->gfx);
-  Renderer*      renderer       = gfx_get_renderer(game->gfx);
-
   gfx_start_frame(render_backend);
-
-  gfx_render_scene(
-      renderer,
-      &(RenderSceneParams){
-          .mode = RenderDefault, .scene = game->scene, .camera = game->camera});
-
-  if (plugin_resolve(game->plugin, plugin_render, "render")) {
-    // Plugin state may be null if plugin does not expose init().
-    void* plugin_state = get_plugin_state(game->plugin);
-    plugin_call(game->plugin, plugin_render, "render", plugin_state, game);
-  }
-
+  render_plugin(game);
   gfx_end_frame(render_backend);
 }
 
 void app_resize(Game* game, int width, int height) {
-  RenderBackend* render_backend = gfx_get_render_backend(game->gfx);
-  gfx_set_viewport(render_backend, width, height);
-
-  const R    fovy       = 90 * TO_RAD;
-  const R    aspect     = (R)width / (R)height;
-  const R    near       = 0.1;
-  const R    far        = 1000;
-  const mat4 projection = mat4_perspective(fovy, aspect, near, far);
-
-  Camera* camera     = gfx_get_camera_camera(game->camera);
-  camera->projection = projection;
+  resize_plugin(game, width, height);
 }
 
 GFX_APP_MAIN(WIDTH, HEIGHT, MAX_FPS);