write code for window handling

src/io/window.c

@@ -0,0 +1,50 @@
+#include "window.h"
+
+#include <SDL.h>
+#include <SDL_audio.h>
+#include <SDL_error.h>
+#include <SDL_video.h>
+#include <assert.h>
+
+#include "../error.h"
+#include "../game/game.h"
+#include "audio.h"
+#include "input.h"
+#include "render.h"
+
+static SDL_Window* win = NULL;
+static bool close = false;
+
+void window_init(void) {
+	assert(!win && !close);
+	if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO) < 0)
+		fatal(ERROR_SDL_INIT, "SDL could not initialize! SDL Error: %s", SDL_GetError());
+
+	SDL_Window* const window = SDL_CreateWindow("tetris clone", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, SCREEN_WIDTH, SCREEN_HEIGHT, SDL_WINDOW_SHOWN);
+	if (window == NULL)
+		fatal(ERROR_SDL_RENDERING_INIT, "Window failed to be created! SDL Error: %s", SDL_GetError());
+
+	render_init(win);
+	audio_device_init(32000, AUDIO_S16, 1, 4096);
+}
+
+void window_close(void) {
+	close = true;
+}
+
+void window_loop(void) {
+	assert(win);
+
+	while (!close) {
+		game_update(input_getdat());
+		render_update();
+	}
+}
+
+void window_free(void) {
+	assert(win);
+	render_free();
+	SDL_DestroyWindow(win);
+	win = NULL;
+	close = false;
+}

src/io/window.h

@@ -0,0 +1,12 @@
+#pragma once
+
+#include "../game/game.h"
+
+#define PX_DENS       25                                     // pixel density; pixels per block
+#define SCREEN_WIDTH  ((COLUMNS + 6) * PX_DENS)              // window width
+#define SCREEN_HEIGHT ((COLUMNS) * PX_DENS / COLUMNS * ROWS) // window height
+
+void window_init(void);
+void window_close(void);
+void window_loop(void);
+void window_free(void);