Implement core

Take inspiration from re3 on directory structure.

.editorconfig

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+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_size = 2
+indent_style = tab
+insert_final_newline = true
+max_line_length = 120
+tab_width = 2

.gitignore

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+*.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)
+project(izanami C)
+
+set(CMAKE_C_STANDARD 11)
+
+set(SDL2PATH "E:\\Projects\\Games\\izanami\\dependencies\\SDL2-2.0.16\\x86_64-w64-mingw32")
+find_package(SDL2 REQUIRED)
+include_directories(${SDL2_INCLUDE_DIR})
+add_executable(izanami src/packages/game/main.c src/packages/game/math/IZ_vector.c src/packages/game/math/IZ_vector.h src/packages/game/math/IZ_math.c src/packages/game/math/IZ_math.h src/packages/game/core/IZ_placeable.c src/packages/game/core/IZ_placeable.h src/packages/game/core/IZ_movable.c src/packages/game/core/IZ_movable.h src/packages/game/core/IZ_spatial.c src/packages/game/core/IZ_spatial.h)
+target_link_libraries(izanami ${SDL2_LIBRARY})
+
+
+if (WIN32)
+add_custom_command(TARGET izanami POST_BUILD
+	COMMAND ${CMAKE_COMMAND} -E copy_if_different  # which executes "cmake - E copy_if_different..."
+	"${PROJECT_SOURCE_DIR}/dependencies/SDL2-2.0.16/x86_64-w64-mingw32/bin/SDL2.dll"      # <--this is in-file
+	$<TARGET_FILE_DIR:izanami>)                 # <--this is out-file path
+endif (WIN32)
+
+if (WIN64)
+	add_custom_command(TARGET izanami POST_BUILD
+		COMMAND ${CMAKE_COMMAND} -E copy_if_different  # which executes "cmake - E copy_if_different..."
+		"${PROJECT_SOURCE_DIR}/dependencies/SDL2-2.0.16/x86_64-w64-mingw32/bin/SDL2.dll"      # <--this is in-file
+		$<TARGET_FILE_DIR:izanami>)                 # <--this is out-file path
+endif (WIN64)

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).
+   1. For Windows, unpack the archive under `dependencies` folder in this project's root.
+3. Build via CMake.
+
+## Todo
+
+- [X] Windows setup
+- [ ] macOS setup

src/packages/game/core/IZ_movable.c

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+#include "IZ_movable.h"

src/packages/game/core/IZ_movable.h

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+#ifndef IZ_MOVABLE_H
+#define IZ_MOVABLE_H
+
+#include "../math/IZ_vector.h"
+
+typedef struct {
+	IZ_Vector velocity;
+} IZ_Movable;
+
+#endif //IZ_MOVABLE_H

src/packages/game/core/IZ_placeable.c

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+#include "IZ_placeable.h"

src/packages/game/core/IZ_placeable.h

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+#ifndef IZ_PLACEABLE_H
+#define IZ_PLACEABLE_H
+
+#include "../math/IZ_vector.h"
+
+typedef struct {
+	IZ_Vector location;
+} IZ_Placeable;
+
+#endif //IZ_PLACEABLE_H

src/packages/game/core/IZ_spatial.c

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+#include "IZ_spatial.h"

src/packages/game/core/IZ_spatial.h

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+#ifndef IZ_SPATIAL_H
+#define IZ_SPATIAL_H
+
+#include "IZ_placeable.h"
+
+typedef struct {
+	IZ_Placeable placeable;
+	IZ_Vector size;
+} IZ_Spatial;
+
+#endif //IZ_SPATIAL_H

src/packages/game/main.c

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+#include <SDL.h>
+#include <stdbool.h>
+#include <stdio.h>
+
+const char* APP_NAME = "SDL2";
+const int SCREEN_WIDTH = 640;
+const int SCREEN_HEIGHT = 480;
+
+int main(int argc, char* args[]) {
+	SDL_Window* window = NULL;
+	SDL_Surface* screenSurface = NULL;
+
+	if (SDL_Init(SDL_INIT_VIDEO) < 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);
+	while (!quit) {
+		while (SDL_PollEvent(&e) != 0) {
+			if (e.type == SDL_QUIT) {
+				quit = true;
+			}
+			SDL_FillRect(screenSurface, NULL, SDL_MapRGB(screenSurface->format, 0xFF, 0xFF, 0xFF));
+			SDL_UpdateWindowSurface(window);
+		}
+	}
+	SDL_DestroyWindow(window);
+	SDL_Quit();
+
+	return 0;
+}

src/packages/game/math/IZ_math.c

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+#include "IZ_math.h"

src/packages/game/math/IZ_math.h

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+#ifndef IZ_MATH_H
+#define IZ_MATH_H
+
+#include <math.h>
+
+typedef float IZ_Real;
+
+inline IZ_Real IZ_Sqrt(IZ_Real x) { return (IZ_Real) sqrtf(x); }
+
+#endif //IZ_MATH_H

src/packages/game/math/IZ_vector.c

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+#include "IZ_vector.h"

src/packages/game/math/IZ_vector.h

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+#ifndef IZ_VECTOR_H
+#define IZ_VECTOR_H
+
+#include "IZ_math.h"
+
+typedef struct {
+	// positive X is rightwards
+	IZ_Real x;
+
+	// positive Y is downwards
+	IZ_Real y;
+} IZ_Vector;
+
+inline IZ_Vector IZ_VectorAdd(IZ_Vector a, IZ_Vector b) {
+	return (IZ_Vector) {
+		.x = a.x + b.x,
+		.y = a.y + b.y,
+	};
+}
+
+inline IZ_Vector IZ_VectorSubtract(IZ_Vector a, IZ_Vector b) {
+	return (IZ_Vector) {
+		.x = a.x - b.x,
+		.y = a.y - b.y,
+	};
+}
+
+inline IZ_Vector IZ_VectorMultiply(IZ_Vector a, IZ_Real b) {
+	return (IZ_Vector) {
+		.x = a.x * b,
+		.y = a.y * b,
+	};
+}
+
+inline IZ_Vector IZ_VectorDivide(IZ_Vector a, IZ_Real b) {
+	return (IZ_Vector) {
+		.x = a.x / b,
+		.y = a.y / b,
+	};
+}
+
+inline IZ_Real IZ_VectorDot(IZ_Vector a, IZ_Vector b) {
+	return a.x * b.x + a.y * b.y;
+}
+
+inline IZ_Real IZ_VectorDistance(IZ_Vector a, IZ_Vector b) {
+	IZ_Real x = b.x - a.x;
+	IZ_Real y = b.y - a.y;
+	return IZ_Sqrt(x * x + y * y);
+}
+
+#endif //IZ_VECTOR_H