implemented keyboard

Makefile

@@ -3,7 +3,7 @@ ECHO=echo -e
 CFLAGS=-Wall -Werror -std=gnu99 -O0 -g -Iinclude
 LIBS=-lSDL2
 
-FILES=build/main.o build/mem.o build/stack.o
+FILES=build/main.o build/mem.o build/stack.o build/keyboard.o
 OUT=bin/chip8.out
 
 all: $(FILES)
@@ -22,6 +22,10 @@ build/stack.o: src/stack.c
 	@$(ECHO) "CC\t\t"$<
 	@$(CC) $(CFLAGS) $< -c -o $@ $(LIBS)
 
+build/keyboard.o: src/keyboard.c
+	@$(ECHO) "CC\t\t"$<
+	@$(CC) $(CFLAGS) $< -c -o $@ $(LIBS)
+
 run: all
 	@$(ECHO) "Runing the Chip8 compiler"
 	@$(OUT)

include/chip8.h

@@ -2,6 +2,7 @@
 #define __CHIP8_H
 
 #include "config.h"
+#include "keyboard.h"
 #include "mem.h"
 #include "registers.h"
 #include "stack.h"
@@ -11,6 +12,7 @@ struct chip8
 	struct chip8_memory memory;
 	struct chip8_registers registers;
 	struct chip8_stack stack;
+	struct chip8_keyboard keyboard;
 };
 
 #endif

include/config.h

@@ -10,5 +10,6 @@
 
 #define CHIP8_TOTAL_DATA_REGISTERS 16
 #define CHIP8_TOTAL_STACK_DEPTH 16
+#define CHIP8_TOTAL_KEYS 16
 
 #endif

include/keyboard.h

@@ -0,0 +1,16 @@
+#ifndef __KEYBOARD_H
+#define __KEYBOARD_H
+
+#include "config.h"
+
+struct chip8_keyboard
+{
+	_Bool keys[CHIP8_TOTAL_KEYS];
+};
+
+int chip8_keyboard_map (const char *map, char key);
+void chip8_keyboard_down (struct chip8_keyboard *kbd, int key);
+void chip8_keyboard_up (struct chip8_keyboard *kbd, int key);
+_Bool chip8_keyboard_is_down (struct chip8_keyboard *kbd, int key);
+
+#endif

src/keyboard.c

@@ -0,0 +1,46 @@
+#include "keyboard.h"
+#include <assert.h>
+
+static void
+chip8_keyboard_ensure_in_bounds (int key)
+{
+	assert (key >= 0 && key < CHIP8_TOTAL_KEYS);
+}
+
+int
+chip8_keyboard_map (const char *map, char key)
+{
+	for (int i = 0; i < CHIP8_TOTAL_KEYS; i++)
+		{
+			if (map[i] == key)
+				{
+					return i;
+				}
+		}
+
+	return -1;
+}
+
+void
+chip8_keyboard_down (struct chip8_keyboard *kbd, int key)
+{
+	chip8_keyboard_ensure_in_bounds (key);
+
+	kbd->keys[key] = 1;
+}
+
+void
+chip8_keyboard_up (struct chip8_keyboard *kbd, int key)
+{
+	chip8_keyboard_ensure_in_bounds (key);
+
+	kbd->keys[key] = 0;
+}
+
+_Bool
+chip8_keyboard_is_down (struct chip8_keyboard *kbd, int key)
+{
+	chip8_keyboard_ensure_in_bounds (key);
+
+	return kbd->keys[key];
+}

src/main.c

@@ -2,16 +2,14 @@
 
 #include "chip8.h"
 
+const char keyboard_map[CHIP8_TOTAL_KEYS]
+		= { SDLK_0, SDLK_1, SDLK_2, SDLK_3, SDLK_4, SDLK_5, SDLK_6, SDLK_7,
+				SDLK_8, SDLK_9, SDLK_a, SDLK_b, SDLK_c, SDLK_d, SDLK_e, SDLK_f };
+
 int
 main (int argc, char **argv)
 {
 	struct chip8 chip8;
-	chip8.registers.SP = 0;
-	chip8_stack_push (&chip8, 0xff);
-	chip8_stack_push (&chip8, 0xaa);
-
-	printf ("%x\n", chip8_stack_pop (&chip8));
-	printf ("%x\n", chip8_stack_pop (&chip8));
 
 	SDL_Init (SDL_INIT_EVERYTHING);
 	SDL_Window *window = SDL_CreateWindow (
@@ -26,9 +24,33 @@ main (int argc, char **argv)
 			SDL_Event event;
 			while (SDL_PollEvent (&event))
 				{
-					if (event.type == SDL_QUIT)
+					switch (event.type)
 						{
+						case SDL_QUIT:
 							goto out;
+							break;
+
+						case SDL_KEYDOWN:
+							{
+								char key = event.key.keysym.sym;
+								int vkey = chip8_keyboard_map (keyboard_map, key);
+								if (vkey != -1)
+									{
+										chip8_keyboard_down (&chip8.keyboard, vkey);
+									}
+							}
+							break;
+
+						case SDL_KEYUP:
+							{
+								char key = event.key.keysym.sym;
+								int vkey = chip8_keyboard_map (keyboard_map, key);
+								if (vkey != -1)
+									{
+										chip8_keyboard_up (&chip8.keyboard, vkey);
+									}
+							}
+							break;
 						}
 				}