Route startup resources through app core

src/app_core/app_startup.h

@@ -2,6 +2,7 @@
 
 #include "foundation/result.h"
 
+#include <cmath>
 #include <limits>
 
 namespace pp::app {
@@ -15,6 +16,16 @@ struct AppStartupPlan {
     bool show_license_warning = false;
 };
 
+struct AppStartupResourcePlan {
+    int ui_render_target_width = 0;
+    int ui_render_target_height = 0;
+    bool initialize_shaders = true;
+    bool initialize_assets = true;
+    bool initialize_layout = true;
+    bool update_title = true;
+    bool create_ui_render_target = true;
+};
+
 class AppStartupServices {
 public:
     virtual ~AppStartupServices() = default;
@@ -26,6 +37,17 @@ public:
     virtual void show_license_warning() = 0;
 };
 
+class AppStartupResourceServices {
+public:
+    virtual ~AppStartupResourceServices() = default;
+
+    virtual void initialize_shaders() = 0;
+    virtual void initialize_assets() = 0;
+    virtual void initialize_layout() = 0;
+    virtual void update_title() = 0;
+    virtual void create_ui_render_target(int width, int height) = 0;
+};
+
 [[nodiscard]] inline pp::foundation::Result<AppStartupPlan> plan_app_startup(
     int current_run_counter,
     bool auto_timelapse_enabled,
@@ -51,6 +73,32 @@ public:
     return pp::foundation::Result<AppStartupPlan>::success(plan);
 }
 
+[[nodiscard]] inline pp::foundation::Result<AppStartupResourcePlan> plan_app_startup_resources(
+    float ui_width,
+    float ui_height)
+{
+    if (!std::isfinite(ui_width) || !std::isfinite(ui_height)) {
+        return pp::foundation::Result<AppStartupResourcePlan>::failure(
+            pp::foundation::Status::invalid_argument("startup resource dimensions must be finite"));
+    }
+
+    if (ui_width < 1.0F || ui_height < 1.0F) {
+        return pp::foundation::Result<AppStartupResourcePlan>::failure(
+            pp::foundation::Status::invalid_argument("startup resource dimensions must be positive"));
+    }
+
+    if (ui_width > static_cast<float>(std::numeric_limits<int>::max())
+        || ui_height > static_cast<float>(std::numeric_limits<int>::max())) {
+        return pp::foundation::Result<AppStartupResourcePlan>::failure(
+            pp::foundation::Status::out_of_range("startup resource dimensions exceed integer range"));
+    }
+
+    AppStartupResourcePlan plan;
+    plan.ui_render_target_width = static_cast<int>(ui_width);
+    plan.ui_render_target_height = static_cast<int>(ui_height);
+    return pp::foundation::Result<AppStartupResourcePlan>::success(plan);
+}
+
 [[nodiscard]] inline pp::foundation::Status execute_app_startup_plan(
     const AppStartupPlan& plan,
     AppStartupServices& services)
@@ -109,4 +157,32 @@ public:
     return pp::foundation::Status::success();
 }
 
+[[nodiscard]] inline pp::foundation::Status execute_app_startup_resources(
+    const AppStartupResourcePlan& plan,
+    AppStartupResourceServices& services)
+{
+    if (plan.create_ui_render_target
+        && (plan.ui_render_target_width <= 0 || plan.ui_render_target_height <= 0)) {
+        return pp::foundation::Status::invalid_argument("startup resource plan has invalid UI render target size");
+    }
+
+    if (plan.initialize_shaders) {
+        services.initialize_shaders();
+    }
+    if (plan.initialize_assets) {
+        services.initialize_assets();
+    }
+    if (plan.initialize_layout) {
+        services.initialize_layout();
+    }
+    if (plan.update_title) {
+        services.update_title();
+    }
+    if (plan.create_ui_render_target) {
+        services.create_ui_render_target(plan.ui_render_target_width, plan.ui_render_target_height);
+    }
+
+    return pp::foundation::Status::success();
+}
+
 } // namespace pp::app