Update CMake config, add events demo

Make CMake load dependencies relative to project directory.

.gitignore

@@ -0,0 +1,62 @@
+*.d
+*.o
+*.ko
+*.obj
+*.elf
+*.ilk
+*.map
+*.exp
+*.gch
+*.pch
+*.lib
+*.a
+*.la
+*.lo
+*.dll
+*.so
+*.so.*
+*.dylib
+*.exe
+*.out
+*.app
+*.i*86
+*.x86_64
+*.hex
+*.dSYM/
+*.su
+*.idb
+*.pdb
+*.mod*
+*.cmd
+.tmp_versions/
+modules.order
+Module.symvers
+Mkfile.old
+dkms.conf
+CMakeLists.txt.user
+CMakeCache.txt
+CMakeFiles
+CMakeScripts
+Testing
+Makefile
+cmake_install.cmake
+install_manifest.txt
+compile_commands.json
+CTestTestfile.cmake
+_deps
+Thumbs.db
+Thumbs.db:encryptable
+ehthumbs.db
+ehthumbs_vista.db
+*.stackdump
+[Dd]esktop.ini
+$RECYCLE.BIN/
+*.cab
+*.msi
+*.msix
+*.msm
+*.msp
+*.lnk
+.idea/
+cmake-build-debug/
+dependencies/

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.20)
+
+# Set your project name here
+project(izanagi C)
+
+set(CMAKE_C_STANDARD 11)
+
+include_directories("${PROJECT_SOURCE_DIR}/dependencies/SDL2/include")
+
+if (WIN32)
+	if (CMAKE_SIZEOF_VOID_P EQUAL 8)
+		set(PROJECT_ARCH x64)
+	else ()
+		set(PROJECT_ARCH x86)
+	endif ()
+endif ()
+
+link_directories("${PROJECT_SOURCE_DIR}/dependencies/SDL2/lib/${PROJECT_ARCH}")
+add_executable(izanagi src/packages/game/main.c)
+target_link_libraries(izanagi SDL2main SDL2)
+
+if (WIN32)
+	add_custom_command(TARGET izanagi POST_BUILD
+		COMMAND ${CMAKE_COMMAND} -E copy_if_different  # which executes "cmake - E copy_if_different..."
+		"${PROJECT_SOURCE_DIR}/dependencies/SDL2/lib/${PROJECT_ARCH}/SDL2.dll"      # <--this is in-file
+		$<TARGET_FILE_DIR:izanagi>)                 # <--this is out-file path
+endif ()

README.md

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+# sdl2-hello-world
+
+A beginner template for SDL2 powered by CMake.
+
+## Setup
+
+1. Clone this repo.
+2. Download the **SDL2 Development Libraries** from the [official download page](https://www.libsdl.org/download-2.0.php).
+   - For Windows
+     1. Unpack the **MSVC** archive under `dependencies` folder in this project's root.
+     2. Rename the directory as `SDL2`.
+   - For macOS
+     
+     `TODO`
+   
+   _Alternatively, on Windows, you can link the external libraries via symlink._
+3. Build via CMake.

src/packages/game/main.c

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+#include <SDL.h>
+#include <stdbool.h>
+#include <stdio.h>
+
+const char* APP_NAME = "SDL2";
+const unsigned int SCREEN_WIDTH = 640;
+const unsigned int SCREEN_HEIGHT = 480;
+
+const unsigned char CONTROLS = 16;
+
+const SDL_KeyCode KEYBOARD_CONTROLS[CONTROLS] = {
+	SDLK_RIGHT,
+	SDLK_DOWN,
+	SDLK_LEFT,
+	SDLK_UP,
+	SDLK_RETURN, // yes
+	SDLK_BACKSPACE, // no
+	SDLK_a, // action0
+	SDLK_s, // action1
+	SDLK_d, // action2
+	SDLK_f, // action3
+	SDLK_z, // action4
+	SDLK_x, // action5
+	SDLK_c, // action6
+	SDLK_v, // action7
+	SDLK_w, // action8
+	SDLK_e, // action9
+};
+
+int main(int argc, char* args[]) {
+	SDL_Window* window = NULL;
+	SDL_Surface* screenSurface = NULL;
+
+	if (SDL_Init(
+		SDL_INIT_VIDEO
+		| SDL_INIT_GAMECONTROLLER
+		| SDL_INIT_EVENTS
+	) < 0) {
+		printf("SDL could not initialize! SDL_Error: %s\n", SDL_GetError());
+		return -1;
+	}
+
+	window = SDL_CreateWindow(
+		APP_NAME,
+		SDL_WINDOWPOS_UNDEFINED,
+		SDL_WINDOWPOS_UNDEFINED,
+		SCREEN_WIDTH,
+		SCREEN_HEIGHT,
+		SDL_WINDOW_SHOWN
+	);
+
+	if (window == NULL) {
+		printf("Window could not be created! SDL_Error: %s\n", SDL_GetError());
+		return -2;
+	}
+
+	bool quit = false;
+	SDL_Event e;
+	screenSurface = SDL_GetWindowSurface(window);
+
+	unsigned short action = 0;
+	while (!quit) {
+		SDL_FillRect(screenSurface, NULL, SDL_MapRGB(screenSurface->format, 0x00, 0x00, 0x00));
+		uint64_t ticks = SDL_GetTicks64();
+		for (unsigned char i = 0; i < 64; i += 1) {
+			const unsigned char column = (64 - i) % 32;
+			const unsigned char row = i / 32;
+			const uint64_t bitflag = (0x1lu << i);
+			const unsigned char size = 4;
+			if (ticks & bitflag) {
+				SDL_FillRect(screenSurface, &(SDL_Rect) {
+					column * size,
+					SCREEN_HEIGHT - ((row + 1) * size),
+					size,
+					size
+					}, SDL_MapRGB(screenSurface->format, 0x00, 0xff, 0xff));
+			}
+		}
+
+		while (SDL_PollEvent(&e) != 0) {
+			if (e.type == SDL_QUIT) {
+				quit = true;
+			}
+
+			for (unsigned char i = 0; i < CONTROLS; i += 1) {
+				// TODO do same for gamepad
+				if (e.key.keysym.sym == KEYBOARD_CONTROLS[i]) {
+					const unsigned short bitflag = (0x1 << i);
+					if (e.type == SDL_KEYDOWN) {
+						action |= bitflag;
+					} else if (e.type == SDL_KEYUP) {
+						action &= ~bitflag;
+					}
+				}
+			}
+
+			for (unsigned char i = 0; i < CONTROLS; i += 1) {
+				const unsigned char column = i % 4;
+				const unsigned char row = i / 4;
+				const unsigned short bitflag = (0x1 << i);
+				const unsigned char size = 4;
+				if (action & bitflag) {
+					SDL_FillRect(screenSurface, &(SDL_Rect) {
+						column * size,
+						row * size,
+						size,
+						size
+					}, SDL_MapRGB(screenSurface->format, 0xff, 0xff, 0x00));
+				}
+			}
+
+			SDL_UpdateWindowSurface(window);
+		}
+	}
+	SDL_DestroyWindow(window);
+	SDL_Quit();
+
+	return 0;
+}