testbed: application skel

testbed/CMakeLists.txt

@@ -46,16 +46,16 @@ target_compile_definitions(
 target_sources(
 	testbed
 	PRIVATE
-		testbed.cpp
-        app/context.cpp
+        application/application.cpp
         application/context.cpp
+		testbed.cpp
+        ${imgui_SOURCE_DIR}/backends/imgui_impl_sdl3.cpp
+        ${imgui_SOURCE_DIR}/backends/imgui_impl_sdlrenderer3.cpp
         ${imgui_SOURCE_DIR}/imgui.cpp
         ${imgui_SOURCE_DIR}/imgui_demo.cpp
         ${imgui_SOURCE_DIR}/imgui_draw.cpp
         ${imgui_SOURCE_DIR}/imgui_tables.cpp
         ${imgui_SOURCE_DIR}/imgui_widgets.cpp
-        ${imgui_SOURCE_DIR}/backends/imgui_impl_sdl3.cpp
-        ${imgui_SOURCE_DIR}/backends/imgui_impl_sdlrenderer3.cpp
 )
 
 target_link_libraries(

testbed/application/application.cpp

@@ -0,0 +1,74 @@
+#include <cstdint>
+#include <SDL3/SDL.h>
+#include <application/application.h>
+#include <application/context.h>
+#include <backends/imgui_impl_sdl3.h>
+#include <backends/imgui_impl_sdlrenderer3.h>
+#include <imgui.h>
+
+namespace testbed {
+
+void application::update() {
+    ImGui_ImplSDLRenderer3_NewFrame();
+    ImGui_ImplSDL3_NewFrame();
+    ImGui::NewFrame();
+
+    // update...
+}
+
+void application::draw(const context &context) const {
+    SDL_SetRenderDrawColor(context, 0u, 0u, 0u, SDL_ALPHA_OPAQUE);
+    SDL_RenderClear(context);
+
+    // draw...
+
+    ImGui::Render();
+    ImGuiIO &io = ImGui::GetIO();
+    SDL_SetRenderScale(context, io.DisplayFramebufferScale.x, io.DisplayFramebufferScale.y);
+    ImGui_ImplSDLRenderer3_RenderDrawData(ImGui::GetDrawData(), context);
+
+    SDL_RenderPresent(context);
+}
+
+void application::input() {
+    ImGuiIO &io = ImGui::GetIO();
+    SDL_Event event{};
+
+    while(SDL_PollEvent(&event)) {
+        ImGui_ImplSDL3_ProcessEvent(&event);
+
+        switch(event.type) {
+        case SDL_EVENT_KEY_DOWN:
+            switch(event.key.key) {
+            case SDLK_ESCAPE:
+                quit = true;
+                break;
+            }
+            break;
+        }
+    }
+}
+
+application::application()
+    : quit{} {
+    SDL_Init(SDL_INIT_EVENTS | SDL_INIT_VIDEO);
+}
+
+application::~application() {
+    SDL_Quit();
+}
+
+int application::run() {
+    context context{};
+    quit = false;
+
+    while(!quit) {
+        update();
+        draw(context);
+        input();
+    }
+
+    return 0;
+}
+
+} // namespace testbed

testbed/application/application.h

@@ -0,0 +1,27 @@
+#pragma once
+
+#include <SDL3/SDL_events.h>
+
+struct SDL_Renderer;
+
+namespace testbed {
+
+struct config;
+struct context;
+
+class application {
+    void update();
+    void draw(const context &) const;
+    void input();
+
+public:
+    application();
+    ~application();
+
+    int run();
+
+private:
+    bool quit;
+};
+
+} // namespace testbed

testbed/testbed.cpp

@@ -1,6 +1,6 @@
-#include <application/context.h>
+#include <application/application.h>
 
 int main() {
-    testbed::context ctx{};
-    return 0;
+    testbed::application application{};
+    return application.run();
 }