Rewrite of main function to use SDL3 app main callbacks

.gitignore

@@ -103,4 +103,7 @@ CMakeUserPresets.json
 # Other
 .cache/
 .vscode/
-build/
+build/
+
+.kdev4/
+*.kdev4

CMakeLists.txt

@@ -1,10 +1,10 @@
 cmake_minimum_required(VERSION 3.10)
-project(vksdlproj VERSION 0.1.0 LANGUAGES C CXX)
+project(vksdlproj VERSION 0.2.0 LANGUAGES C CXX)
 
 SET(CMAKE_BUILD_RPATH_USE_ORIGIN TRUE)
 set(EXE_NAME project)
 
-set(PROGRAM_SOURCES ${CMAKE_CURRENT_SOURCE_DIR}/src/vulkanapp.cc)
+set(PROGRAM_SOURCES )#${CMAKE_CURRENT_SOURCE_DIR}/src/vulkanapp.cc)
 
 option(SDL3_NONSYSTEM "Use SDL3 from folder in source tree" ON)
 
@@ -69,4 +69,4 @@ endif()
 # Linking
 target_link_libraries(${EXE_NAME} PRIVATE SDL3::SDL3)
 target_link_libraries(${EXE_NAME} PRIVATE Vulkan::Vulkan)
-target_link_libraries(${EXE_NAME} PRIVATE vk-bootstrap::vk-bootstrap)
+target_link_libraries(${EXE_NAME} PRIVATE vk-bootstrap::vk-bootstrap)

include/vulkanapp.hh

@@ -7,6 +7,8 @@
 #include <vector>
 #include <optional>
 
+#include <stdio.h>
+
 #include <vulkan/vulkan.h>
 
 const std::vector<const char*> validationLayers = {
@@ -138,4 +140,4 @@ private:
 
         return VK_FALSE;
     }
-};
+};

src/main.cc

@@ -1,19 +1,62 @@
-#include "vulkanapp.hh"
+#define SDL_MAIN_USE_CALLBACKS
+#include <SDL3/SDL_main.h>
+#include <SDL3/SDL_init.h>
+#include <SDL3/SDL.h>
 
-#include <exception>
+constexpr uint32_t winInitWidth = 512;
+constexpr uint32_t winInitHeight = 512;
 
-int main() {
-    VulkanApp app(1024, 1024);
+struct AppContext {
+    SDL_Window *window;
+    SDL_AppResult appQuit = SDL_APP_CONTINUE;
+};
 
-    try {
-        app.init();
-        app.loop();
-        app.cleanup();
-    } catch(const std::exception& except) {
-        fprintf(stderr, "Error! %s\n", except.what());
+SDL_AppResult SDL_Fail() {
+    SDL_LogError(SDL_LOG_CATEGORY_ERROR, "Error: %s", SDL_GetError());
+    return SDL_APP_FAILURE;
+}
 
-        return 1;
+SDL_AppResult SDL_AppInit(void **appstate, int argc, char **argv) {
+    if(!SDL_Init(SDL_INIT_VIDEO))
+        return SDL_Fail();
+
+    SDL_Window *win = SDL_CreateWindow("SDL3 Vulkan", winInitWidth, winInitHeight, SDL_WINDOW_RESIZABLE | SDL_WINDOW_VULKAN);
+
+    if(!win)
+        return SDL_Fail();
+
+    *appstate = new AppContext {
+        .window = win,
+    };
+
+    return SDL_APP_CONTINUE;
+}
+
+SDL_AppResult SDL_AppEvent(void *appstate, SDL_Event *event) {
+    AppContext* app = static_cast<AppContext*>(appstate);
+
+    switch(event->type) {
+        case SDL_EVENT_QUIT:
+            app->appQuit = SDL_APP_SUCCESS;
     }
 
-    return 0;
-}
+    return SDL_APP_CONTINUE;
+}
+
+SDL_AppResult SDL_AppIterate(void *appstate) {
+    AppContext* app = static_cast<AppContext*>(appstate);
+
+    return app->appQuit;
+}
+
+void SDL_AppQuit(void *appstate, SDL_AppResult result) {
+    AppContext* app = static_cast<AppContext*>(appstate);
+
+    if(app) {
+        SDL_DestroyWindow(app->window);
+
+        delete app;
+    }
+
+    SDL_Quit();
+}