Add SDL3

Author: RobLoach

demo/sdl3_renderer/.gitignore

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+SDL
+build

demo/sdl3_renderer/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.16)
+
+set(CMAKE_RUNTIME_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/$<CONFIGURATION>")
+set(CMAKE_LIBRARY_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/$<CONFIGURATION>")
+set(CMAKE_INSTALL_PREFIX "${CMAKE_BINARY_DIR}" CACHE INTERNAL "")
+
+# CMAKE Modules
+set(CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake")
+
+project(nuklear_sdl3_renderer)
+
+set(EXECUTABLE_NAME ${PROJECT_NAME})
+
+# The SDL java code is hardcoded to load libmain.so on android, so we need to change EXECUTABLE_NAME
+if (ANDROID)
+	set(EXECUTABLE_NAME main)
+	add_library(${EXECUTABLE_NAME} SHARED)
+else()
+	add_executable(${EXECUTABLE_NAME})
+endif()
+
+# Add your sources to the target
+target_sources(${EXECUTABLE_NAME} PRIVATE main.c)
+
+find_package(SDL3 REQUIRED)
+
+target_link_libraries(${EXECUTABLE_NAME} PUBLIC SDL3::SDL3)
+
+# Nuklear Include Directory
+target_include_directories(${EXECUTABLE_NAME} PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/../..)
+
+# on Visual Studio, set our app as the default project
+set_property(DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR} PROPERTY VS_STARTUP_PROJECT "${EXECUTABLE_NAME}")

demo/sdl3_renderer/cmake/FindSDL3.cmake

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+include(FetchContent)
+FetchContent_Declare(
+    SDL3
+    GIT_REPOSITORY https://github.com/libsdl-org/SDL.git
+    GIT_TAG eb3fc06
+    #GIT_SHALLOW 1
+)
+FetchContent_MakeAvailable(SDL3)

demo/sdl3_renderer/main.c

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+#define SDL_MAIN_USE_CALLBACKS
+#include <SDL3/SDL.h>
+#include <SDL3/SDL_main.h>
+
+#define NK_SDL_RENDERER_IMPLEMENTATION
+#include "nuklear_sdl3_renderer.h"
+
+typedef struct AppContext {
+    SDL_Window* window;
+    SDL_Renderer* renderer;
+} AppContext;
+
+SDL_AppResult SDL_Fail(){
+    SDL_LogError(SDL_LOG_CATEGORY_CUSTOM, "Error %s", SDL_GetError());
+    return SDL_APP_FAILURE;
+}
+
+SDL_AppResult SDL_AppInit(void** appstate, int argc, char* argv[]) {
+    if (!SDL_Init(SDL_INIT_VIDEO | SDL_INIT_EVENTS)) {
+        return SDL_Fail();
+    }
+
+    AppContext* appContext = (AppContext*)SDL_malloc(sizeof(AppContext));
+    if (appContext == NULL) {
+        return SDL_Fail();
+    }
+
+    if (!SDL_CreateWindowAndRenderer("Nuklear: SDL3 Renderer", 1200, 800, SDL_WINDOW_RESIZABLE, &appContext->window, &appContext->renderer)) {
+        SDL_free(appContext);
+        return SDL_Fail();
+    }
+
+    *appstate = appContext;
+
+    return SDL_APP_CONTINUE;
+}
+
+SDL_AppResult SDL_AppEvent(void *appstate, SDL_Event* event) {
+    AppContext* app = (AppContext*)appstate;
+
+    switch (event->type) {
+        case SDL_EVENT_QUIT:
+            return SDL_APP_SUCCESS;
+    }
+
+    nk_sdl_handle_event(event);
+
+    return SDL_APP_CONTINUE;
+}
+
+SDL_AppResult SDL_AppIterate(void *appstate) {
+    AppContext* app = (AppContext*)appstate;
+
+    SDL_SetRenderDrawColor(app->renderer, 255, 0, 255, SDL_ALPHA_OPAQUE);
+    SDL_RenderClear(app->renderer);
+    SDL_RenderPresent(app->renderer);
+
+    return SDL_APP_CONTINUE;
+}
+
+void SDL_AppQuit(void* appstate, SDL_AppResult result) {
+    AppContext* app = (AppContext*)appstate;
+
+    if (app) {
+        SDL_DestroyRenderer(app->renderer);
+        SDL_DestroyWindow(app->window);
+        SDL_free(app);
+    }
+
+    SDL_Quit();
+}