Add loading screen.

source/appstates/DataLoadingState.cpp

@@ -0,0 +1,50 @@
+#include "appstates/DataLoadingState.hpp"
+
+#include "appstates/FadeState.hpp"
+#include "colors.hpp"
+
+namespace
+{
+    constexpr int SCREEN_CENTER = 640;
+}
+
+DataLoadingState::~DataLoadingState() { DataLoadingState::execute_destructs(); }
+
+void DataLoadingState::update()
+{
+    static constexpr int SCREEN_CENTER = 640;
+
+    BaseTask::update();
+    const std::string status = m_task->get_status();
+    const int statusWidth    = sdl::text::get_width(22, status);
+    m_statusX                = SCREEN_CENTER - (statusWidth / 2);
+}
+
+void DataLoadingState::render()
+{
+    static constexpr int ICON_X_COORD = SCREEN_CENTER - 128;
+    static constexpr int ICON_Y_COORD = 226;
+    const std::string status          = m_task->get_status();
+
+    sdl::render_rect_fill(sdl::Texture::Null, 0, 0, 1280, 720, colors::CLEAR_COLOR);
+    sm_jksvIcon->render(sdl::Texture::Null, ICON_X_COORD, ICON_Y_COORD);
+    sdl::text::render(sdl::Texture::Null, m_statusX, 673, 22, sdl::text::NO_WRAP, colors::WHITE, status);
+    BaseTask::render_loading_glyph();
+}
+
+void DataLoadingState::execute_destructs()
+{
+    for (auto &function : m_destructFunctions) { function(); }
+}
+
+void DataLoadingState::add_destruct_function(DataLoadingState::DestructFunction function)
+{
+    m_destructFunctions.push_back(function);
+}
+
+void DataLoadingState::initialize_static_members()
+{
+    if (sm_jksvIcon) { return; }
+
+    sm_jksvIcon = sdl::TextureManager::create_load_texture("LoadingIcon", "romfs:/Textures/LoadingIcon.png");
+}