write code for input handling

src/io/input.c

@@ -0,0 +1,44 @@
+#include "input.h"
+
+#include <SDL_events.h>
+#include <SDL_scancode.h>
+
+#include "window.h"
+
+__attribute__((const)) static int procscancode(SDL_Scancode code) {
+	switch (code) {
+	case SDL_SCANCODE_Q: return MOVRL;
+	case SDL_SCANCODE_E: return MOVRR;
+
+	case SDL_SCANCODE_LEFT:
+	case SDL_SCANCODE_A:
+		return MOVL;
+
+	case SDL_SCANCODE_RIGHT:
+	case SDL_SCANCODE_D:
+		return MOVR;
+
+	case SDL_SCANCODE_DOWN:
+	case SDL_SCANCODE_S:
+	case SDL_SCANCODE_SPACE:
+		return MOVD;
+
+	case SDL_SCANCODE_ESCAPE:
+		window_close();
+		return 0;
+	default: return 0;
+	}
+}
+
+int input_getdat(void) {
+	int movdat = 0;
+	SDL_Event e;
+	while (SDL_PollEvent(&e)) {
+		switch (e.type) {
+		case SDL_QUIT: window_close(); break;
+		case SDL_KEYDOWN: movdat |= procscancode(e.key.keysym.scancode); break;
+		}
+	}
+
+	return movdat;
+}

src/io/input.h

@@ -0,0 +1,15 @@
+#pragma once
+
+/* 8 bit enumeration storing the movement data */
+enum movdat {
+	MOVL = 1,   // move left
+	MOVR = 2,   // move right
+	MOVD = 4,   // move down
+	MOVRL = 8,  // move roll left
+	MOVRR = 16, // move roll right
+	MOVPL = 32, // move place
+};
+
+/* returns an OR'd string from `enum movdat`, containing the movement data.
+ * assumes that SDL has been initialized and a window has successfully been created. */
+__attribute__((__pure__)) int input_getdat(void);