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first game with sound: chip8 makes noise

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@4286 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Jörg Hohensohn 2004-01-30 22:43:37 +00:00
parent 95298a9558
commit 25a1add8cf
1 changed files with 51 additions and 4 deletions
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55
apps/plugins/chip8.c
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@ -61,15 +61,46 @@ static byte chip8_running; /* Flag for End-of-Emulation */
typedef void (*opcode_fn) (word opcode); typedef void (*opcode_fn) (word opcode);
typedef void (*math_fn) (byte *reg1,byte reg2); typedef void (*math_fn) (byte *reg1,byte reg2);
static bool is_playing;
/* one frame of bitswapped mp3 data */
static unsigned char beep[]={255,
223, 28, 35, 0,192,210, 35,226, 72,188,242, 1,128,166, 16, 68,146,252,151, 19,
10,180,245,127, 96,184, 3,184, 30, 0,118, 59,128,121,102, 6,212, 0, 97, 6,
42, 65, 28,134,192,145, 57, 38,136, 73, 29, 38,132, 15, 21, 70, 91,185, 99,198,
15,192, 83, 6, 33,129, 20, 6, 97, 33, 4, 6,245,128, 92, 6, 24, 0, 86, 6,
56,129, 44, 24,224, 25, 13, 48, 50, 82,180, 11,251,106,249, 59, 24, 82,175,223,
252,119, 76,134,120,236,149,250,247,115,254,145,173,174,168,180,255,107,195, 89,
24, 25, 48,131,192, 61, 48, 64, 10,176, 49, 64, 1,152, 50, 32, 8,140, 48, 16,
5,129, 51,196,187, 41,177, 23,138, 70, 50, 8, 10,242, 48,192, 3,248,226, 0,
20,100, 18, 96, 41, 96, 78,102, 7,201,122, 76,119, 20,137, 37,177, 15,132,224,
20, 17,191, 67,147,187,116,211, 41,169, 63,172,182,186,217,155,111,140,104,254,
111,181,184,144, 17,148, 21,101,166,227,100, 86, 85, 85, 85};
/* callback to request more mp3 data */
void callback(unsigned char** start, int* size)
{
*start = beep; /* give it the same frame again */
*size = sizeof(beep);
}
/****************************************************************************/ /****************************************************************************/
/* Turn sound on */ /* Turn sound on */
/****************************************************************************/ /****************************************************************************/
static void chip8_sound_on (void) { } static void chip8_sound_on (void)
{
if (!is_playing)
rb->mp3_play_pause(true); /* kickoff audio */
}
/****************************************************************************/ /****************************************************************************/
/* Turn sound off */ /* Turn sound off */
/****************************************************************************/ /****************************************************************************/
static void chip8_sound_off (void) { } static void chip8_sound_off (void)
{
if (!is_playing)
rb->mp3_play_pause(false); /* pause audio */
}
static void op_call (word opcode) static void op_call (word opcode)
{ {
@ -430,8 +461,9 @@ static void chip8_execute(void)
--chip8_regs.delay; --chip8_regs.delay;
if (chip8_regs.sound) if (chip8_regs.sound)
--chip8_regs.sound; /* How could we make sound on the archos? */ if (--chip8_regs.sound == 0) /* Update the machine status */
/* Update the machine status */ chip8_sound_off();
chip8_update_display(); chip8_update_display();
chip8_keyboard(); chip8_keyboard();
rb->yield(); /* we should regulate the speed by timer query, sleep/yield */ rb->yield(); /* we should regulate the speed by timer query, sleep/yield */
@ -517,9 +549,24 @@ bool chip8_run(char* file)
rb->lcd_clear_display(); rb->lcd_clear_display();
rb->lcd_drawrect(23,0,66,64); rb->lcd_drawrect(23,0,66,64);
rb->lcd_update(); rb->lcd_update();
/* init sound */
is_playing = rb->mp3_is_playing(); /* would we disturb playback? */
if (!is_playing) /* no? then we can make sound */
{ /* prepare */
rb->mp3_play_init();
rb->mp3_play_data(beep, sizeof(beep), callback);
rb->mpeg_sound_set(SOUND_VOLUME, rb->global_settings->volume);
}
chip8_reset(); chip8_reset();
while (chip8_running) chip8_execute(); while (chip8_running) chip8_execute();
if (!is_playing)
{ /* stop it if we used audio */
rb->mp3_play_stop(); // stop audio ISR
}
return true; return true;
} }