chip8

A simple C CHIP8 VM.
git clone git://git.vgx.fr/chip8
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media-raylib.c (2579B)

      1 #include <assert.h>
      2 #include <string.h>
      3 
      4 #include <raylib.h>
      5 
      6 #include "media.h"
      7 
      8 #define PIXEL_RADIUS 16
      9 
     10 #define SCREEN_WIDTH (64*PIXEL_RADIUS)
     11 #define SCREEN_HEIGHT (32*PIXEL_RADIUS)
     12 
     13 #define WINDOW_NAME "CHIP-8 emulator"
     14 
     15 #define BG_COLOR BLACK
     16 #define FG_COLOR WHITE
     17 
     18 #define SOUND_DEV_FREQ 48000
     19 #define SOUND_SAMPLES 4096
     20 #define BUZZER_FREQ 440
     21 #define BUZZER_VOL .05
     22 
     23 int buzzer_state;
     24 AudioStream audio;
     25 
     26 /*
     27 ┌───┬───┬───┬───┐
     28 │ 1 │ 2 │ 3 │ C │
     29 ├───┼───┼───┼───┤
     30 │ 4 │ 5 │ 6 │ D │
     31 ├───┼───┼───┼───┤
     32 │ 7 │ 8 │ 9 │ E │
     33 ├───┼───┼───┼───┤
     34 │ A │ 0 │ B │ F │
     35 └───┴───┴───┴───┘
     36 */
     37 
     38 KeyboardKey keys[16] = {
     39 	KEY_V,
     40 	KEY_THREE, KEY_FOUR, KEY_FIVE,
     41 	KEY_E, KEY_R, KEY_T,
     42 	KEY_D, KEY_F, KEY_G,
     43 	KEY_C, KEY_B,
     44 	KEY_SIX, KEY_Y, KEY_H, KEY_N
     45 };
     46 
     47 static void update_audio(void){
     48 	static bool should_buzz = 0;
     49 	static long sample_num = 0;
     50 	static char audio_buffer[SOUND_SAMPLES];
     51 
     52 	if (buzzer_state)
     53 		should_buzz = 1;
     54 
     55 	if (IsAudioStreamProcessed(audio)){
     56 		for(int i=0 ; i<SOUND_SAMPLES ; i++){
     57 			if (should_buzz)
     58 				audio_buffer[i] =
     59 					((sample_num++*256*BUZZER_FREQ/SOUND_DEV_FREQ)
     60 					 %256)*BUZZER_VOL;
     61 			else
     62 				audio_buffer[i] = 0;
     63 		}
     64 		UpdateAudioStream(audio, audio_buffer, SOUND_SAMPLES);
     65 		should_buzz = 0;
     66 	}
     67 }
     68 
     69 int m_init(int argc, char **argv){
     70 	(void)argc, (void)argv;
     71 
     72 	InitWindow(SCREEN_WIDTH, SCREEN_HEIGHT, WINDOW_NAME);
     73 	SetTargetFPS(60);
     74 
     75 	InitAudioDevice();
     76 	audio = InitAudioStream(SOUND_DEV_FREQ, 8, 1);
     77 
     78 	PlayAudioStream(audio);
     79 
     80 	BeginDrawing();
     81 
     82 	return 0;
     83 }
     84 
     85 void m_quit(void){
     86 	EndDrawing();
     87 
     88 	CloseAudioStream(audio);
     89 	CloseAudioDevice();
     90 	
     91 	CloseWindow();
     92 }
     93 
     94 unsigned short get_input(unsigned short input){
     95 	if (WindowShouldClose())
     96 		return -1;
     97 
     98 	input = 0;
     99 
    100 	for(int i=0 ; i<16 ; i++){
    101 		if(IsKeyDown(keys[i]))
    102 			input |= 1<<i;
    103 	}
    104 
    105 	return input;
    106 }
    107 unsigned short wait_input(unsigned short input){
    108 	int new_input;
    109 	
    110 	while((new_input = get_input(input)) == input)
    111 		frame();
    112 
    113 	return new_input;
    114 }
    115 
    116 void clear_screen(void){
    117 	ClearBackground(BG_COLOR);
    118 }
    119 
    120 void draw(int x, int y, int value){
    121 	assert(0<=x && x<64);
    122 	assert(0<=y && y<32);
    123 	DrawRectangle(x*PIXEL_RADIUS, y*PIXEL_RADIUS,
    124 			PIXEL_RADIUS, PIXEL_RADIUS,
    125 			value ? FG_COLOR : BG_COLOR);
    126 }
    127 
    128 void frame(void){
    129 	update_audio();
    130 
    131 	EndDrawing();
    132 	BeginDrawing();
    133 }
    134 
    135 void set_buzzer_state(int state){
    136 	buzzer_state = state;
    137 }
    138 
    139 void wait_tick(void){
    140 	//XXX: not used anymore
    141 }