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chip8 plugin:

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* fix some more whitespace
* made functions/data static or const where possible
* correct suspicious interrupt timing code
* remove unused/unreachable code
* fix file descriptor leak path (open without close)


git-svn-id: svn://svn.rockbox.org/rockbox/trunk@24159 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Bertrik Sikken 2010-01-03 13:01:19 +00:00
parent 508bf2b45a
commit f6017773a6
1 changed files with 18 additions and 24 deletions
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42
apps/plugins/chip8.c
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@ -90,14 +90,14 @@ EXTERN byte chip8_mem[4096]; /* machine memory. program */
/* is loaded at 0x200 */ /* is loaded at 0x200 */
EXTERN byte chip8_running; /* if 0, emulation stops */ EXTERN byte chip8_running; /* if 0, emulation stops */
EXTERN void chip8_execute (void); /* execute chip8_iperiod */ EXTERN void chip8_execute (void); /* execute chip8_iperiod */
/* opcodes */ /* opcodes */
EXTERN void chip8_reset (void); /* reset virtual machine */ EXTERN void chip8_reset (void); /* reset virtual machine */
EXTERN void chip8 (void); /* start chip8 emulation */ EXTERN void chip8 (void); /* start chip8 emulation */
EXTERN void chip8_sound_on (void); /* turn sound on */ EXTERN void chip8_sound_on (void); /* turn sound on */
EXTERN void chip8_sound_off (void); /* turn sound off */ EXTERN void chip8_sound_off (void); /* turn sound off */
EXTERN void chip8_interrupt (void); /* update keyboard, */ EXTERN void chip8_interrupt (void); /* update keyboard, */
/* display, etc. */ /* display, etc. */
#ifdef CHIP8_DEBUG #ifdef CHIP8_DEBUG
@ -585,7 +585,7 @@ static void op_sprite (word opcode)
chip8_regs.alg[15]=collision^1; chip8_regs.alg[15]=collision^1;
} }
static math_fn math_opcodes[16]= static const math_fn math_opcodes[16]=
{ {
math_mov, math_mov,
math_or, math_or,
@ -611,7 +611,7 @@ static void op_math (word opcode)
(get_reg_offset(opcode),get_reg_value_2(opcode)); (get_reg_offset(opcode),get_reg_value_2(opcode));
} }
static opcode_fn main_opcodes[16]= static const opcode_fn main_opcodes[16]=
{ {
op_system, op_system,
op_jmp, op_jmp,
@ -642,7 +642,7 @@ STATIC word chip8_trap;
STATIC void chip8_debug (word opcode,struct chip8_regs_struct *regs) STATIC void chip8_debug (word opcode,struct chip8_regs_struct *regs)
{ {
int i; int i;
byte hextable[16] = "0123456789ABCDEF"; static const byte hextable[16] = "0123456789ABCDEF";
byte v1[3] = "Vx\0"; byte v1[3] = "Vx\0";
byte v2[3] = "Vx\0"; byte v2[3] = "Vx\0";
v1[1] = hextable[(opcode>>8)&0x0f]; v1[1] = hextable[(opcode>>8)&0x0f];
@ -857,7 +857,7 @@ STATIC void chip8_execute(void)
/****************************************************************************/ /****************************************************************************/
STATIC void chip8_reset(void) STATIC void chip8_reset(void)
{ {
static byte chip8_sprites[0x50]= static const byte chip8_sprites[0x50]=
{ {
0xf9,0x99,0xf2,0x62,0x27, 0xf9,0x99,0xf2,0x62,0x27,
0xf1,0xf8,0xff,0x1f,0x1f, 0xf1,0xf8,0xff,0x1f,0x1f,
@ -869,7 +869,7 @@ STATIC void chip8_reset(void)
0xf8,0xf8,0xff,0x8f,0x88, 0xf8,0xf8,0xff,0x8f,0x88,
}; /* 4x5 pixel hexadecimal character font patterns */ }; /* 4x5 pixel hexadecimal character font patterns */
#ifdef CHIP8_SUPER #ifdef CHIP8_SUPER
static byte schip_sprites[10*10]= static const byte schip_sprites[10*10]=
{ {
0x3C, 0x7E, 0xC3, 0xC3, 0xC3, 0xC3, 0xC3, 0xC3, 0x7E, 0x3C, /* 0 */ 0x3C, 0x7E, 0xC3, 0xC3, 0xC3, 0xC3, 0xC3, 0xC3, 0x7E, 0x3C, /* 0 */
0x18, 0x38, 0x58, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x3C, /* 1 */ 0x18, 0x38, 0x58, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x3C, /* 1 */
@ -1186,7 +1186,7 @@ static unsigned char beep[]={255,
111,181,184,144, 17,148, 21,101,166,227,100, 86, 85, 85, 85}; 111,181,184,144, 17,148, 21,101,166,227,100, 86, 85, 85, 85};
/* callback to request more mp3 data */ /* callback to request more mp3 data */
void callback(unsigned char** start, size_t* size) static void callback(unsigned char** start, size_t* size)
{ {
*start = beep; /* give it the same frame again */ *start = beep; /* give it the same frame again */
*size = sizeof(beep); *size = sizeof(beep);
@ -1314,7 +1314,7 @@ static void chip8_keyboard(void)
/****************************************************************************/ /****************************************************************************/
static void chip8_interrupt (void) static void chip8_interrupt (void)
{ {
unsigned long newtimer; unsigned long current_tick;
unsigned long timer, runtime; unsigned long timer, runtime;
chip8_update_display(); chip8_update_display();
@ -1322,16 +1322,15 @@ static void chip8_interrupt (void)
cycles ++; cycles ++;
runtime = cycles * HZ / 50; runtime = cycles * HZ / 50;
timer = starttimer + runtime; timer = starttimer + runtime;
newtimer = *rb->current_tick; current_tick = *rb->current_tick;
if (TIME_AFTER(timer, newtimer)) if (TIME_AFTER(timer, current_tick))
{ {
rb->sleep(timer - newtimer); rb->sleep(timer - current_tick);
} }
else else
{ {
rb->yield(); rb->yield();
} }
starttimer = newtimer - runtime;
} }
static bool chip8_init(const char* file) static bool chip8_init(const char* file)
@ -1347,12 +1346,12 @@ static bool chip8_init(const char* file)
return false; return false;
} }
numread = rb->read(fd, chip8_mem+0x200, 4096-0x200); numread = rb->read(fd, chip8_mem+0x200, 4096-0x200);
rb->close(fd);
if (numread==-1) { if (numread==-1) {
rb->lcd_puts(0, 6, "I/O Error."); rb->lcd_puts(0, 6, "I/O Error.");
return false; return false;
} }
rb->close(fd);
/* is there a c8k file (chip8 keys) ? */ /* is there a c8k file (chip8 keys) ? */
char c8kname[MAX_PATH]; char c8kname[MAX_PATH];
rb->strcpy(c8kname, file); rb->strcpy(c8kname, file);
@ -1389,7 +1388,7 @@ static bool chip8_init(const char* file)
return true; return true;
} }
bool chip8_run(const char* file) static bool chip8_run(const char* file)
{ {
int ok; int ok;
@ -1425,11 +1424,6 @@ bool chip8_run(const char* file)
cycles = 0; cycles = 0;
chip8(); chip8();
if (!ok) {
rb->splash(HZ, "Error");
return false;
}
#ifndef SIMULATOR #ifndef SIMULATOR
if (!is_playing) if (!is_playing)
{ /* stop it if we used audio */ { /* stop it if we used audio */