1 files changed, 17 insertions, 15 deletions

diff --git a/app/src/app.c b/app/src/app.c
index e1edf88..a7bb9c9 100644
--- a/app/src/app.c
+++ b/app/src/app.c
@@ -24,7 +24,7 @@ static GfxApp g_gfx_app;
 
 /// Called by GLFW when the window is resized.
 static void on_resize(GLFWwindow* window, int width, int height) {
-  (*g_gfx_app.callbacks.resize)(g_gfx_app.app_state, width, height);
+  (*g_gfx_app.callbacks.resize)(&g_gfx_app, g_gfx_app.app_state, width, height);
 }
 
 /// Run the application's main loop.
@@ -41,12 +41,13 @@ static void loop(GfxApp* app) {
 
   // Warm up the update to initialize the application's state.
   (*app->callbacks.update)(
-      app->app_state, time_delta_to_sec(time), time_delta_to_sec(update_dt));
+      app, app->app_state, time_delta_to_sec(time),
+      time_delta_to_sec(update_dt));
 
   // Warm up the rendering before entering the main loop. A renderer can
   // compile shaders and do other initialization the first time it renders a
   // scene.
-  (*app->callbacks.render)(app->app_state);
+  (*app->callbacks.render)(app, app->app_state);
   glfwSwapBuffers(app->window);
 
   timer_start(&timer);
@@ -56,14 +57,14 @@ static void loop(GfxApp* app) {
 
     while (time_budget >= update_dt) {
       (*app->callbacks.update)(
-          app->app_state, time_delta_to_sec(time),
+          app, app->app_state, time_delta_to_sec(time),
           time_delta_to_sec(update_dt));
 
       time += update_dt;
       time_budget -= update_dt;
     }
 
-    (*app->callbacks.render)(app->app_state);
+    (*app->callbacks.render)(app, app->app_state);
     glfwSwapBuffers(app->window);
     glfwPollEvents();
 
@@ -85,7 +86,7 @@ bool gfx_app_run(const GfxAppDesc* desc, const GfxAppCallbacks* callbacks) {
   g_gfx_app.callbacks         = *callbacks;
   g_gfx_app.max_fps           = desc->max_fps;
   g_gfx_app.update_delta_time = desc->update_delta_time;
-  g_gfx_app.window            = 0;
+  g_gfx_app.window            = nullptr;
 
   if (!glfwInit()) {
     LOGE("glfwInit() failed");
@@ -124,20 +125,21 @@ bool gfx_app_run(const GfxAppDesc* desc, const GfxAppCallbacks* callbacks) {
 
   // Initialize the application's state before setting any callbacks.
   if (!(*g_gfx_app.callbacks.init)(
-          g_gfx_app.app_state, desc->argc, desc->argv)) {
+          &g_gfx_app, g_gfx_app.app_state, desc->argc, desc->argv)) {
     LOGE("Failed to initialize application");
     goto cleanup;
   }
 
   // Trigger an initial resize for convenience.
-  (*g_gfx_app.callbacks.resize)(g_gfx_app.app_state, desc->width, desc->height);
+  (*g_gfx_app.callbacks.resize)(
+      &g_gfx_app, g_gfx_app.app_state, desc->width, desc->height);
 
   // Set GLFW callbacks now that the application has been initialized.
   glfwSetWindowSizeCallback(g_gfx_app.window, on_resize);
 
   loop(&g_gfx_app);
 
-  (*g_gfx_app.callbacks.shutdown)(g_gfx_app.app_state);
+  (*g_gfx_app.callbacks.shutdown)(&g_gfx_app, g_gfx_app.app_state);
 
   success = true;
 
@@ -149,21 +151,21 @@ cleanup:
   return success;
 }
 
-void gfx_app_get_mouse_position(double* x, double* y) {
-  glfwGetCursorPos(g_gfx_app.window, x, y);
+void gfx_app_get_mouse_position(GfxApp* app, double* x, double* y) {
+  glfwGetCursorPos(app->window, x, y);
 }
 
 static int to_glfw_mouse_button(MouseButton button);
 
-bool gfx_app_is_mouse_button_pressed(MouseButton button) {
-  return glfwGetMouseButton(g_gfx_app.window, to_glfw_mouse_button(button)) ==
+bool gfx_app_is_mouse_button_pressed(GfxApp* app, MouseButton button) {
+  return glfwGetMouseButton(app->window, to_glfw_mouse_button(button)) ==
          GLFW_PRESS;
 }
 
 static int to_glfw_key(Key key);
 
-bool gfx_app_is_key_pressed(Key key) {
-  return glfwGetKey(g_gfx_app.window, to_glfw_key(key)) == GLFW_PRESS;
+bool gfx_app_is_key_pressed(GfxApp* app, Key key) {
+  return glfwGetKey(app->window, to_glfw_key(key)) == GLFW_PRESS;
 }
 
 static int to_glfw_mouse_button(MouseButton button) {