forked from len0rd/rockbox
Lee Pilgrim's patch to enable the chip8 plugin for the simulator
I also code-policed it somewhat. git-svn-id: svn://svn.rockbox.org/rockbox/trunk@4207 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Daniel Stenberg
parent
0f68958b11
commit
aac303e17b
1 changed files with 231 additions and 221 deletions
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@ -20,7 +20,6 @@
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#include "plugin.h"
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#include "plugin.h"
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/* Only build for (correct) target */
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/* Only build for (correct) target */
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#ifndef SIMULATOR
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#ifdef HAVE_LCD_BITMAP
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#ifdef HAVE_LCD_BITMAP
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static struct plugin_api* rb; /* here is a global api struct pointer */
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static struct plugin_api* rb; /* here is a global api struct pointer */
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@ -74,95 +73,100 @@ static void chip8_sound_off (void) { }
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static void op_call (word opcode)
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static void op_call (word opcode)
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{
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{
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chip8_regs.sp--;
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chip8_regs.sp--;
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write_mem (chip8_regs.sp,chip8_regs.pc&0xff);
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write_mem (chip8_regs.sp,chip8_regs.pc&0xff);
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chip8_regs.sp--;
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chip8_regs.sp--;
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write_mem (chip8_regs.sp,chip8_regs.pc>>8);
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write_mem (chip8_regs.sp,chip8_regs.pc>>8);
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chip8_regs.pc=opcode;
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chip8_regs.pc=opcode;
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}
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}
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static void op_jmp (word opcode)
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static void op_jmp (word opcode)
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{
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{
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chip8_regs.pc=opcode;
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chip8_regs.pc=opcode;
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}
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}
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static void op_key (word opcode)
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static void op_key (word opcode)
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{
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{
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byte key_value,cp_value;
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byte key_value,cp_value;
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if ((opcode&0xff)==0x9e)
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if ((opcode&0xff)==0x9e)
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cp_value=1;
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cp_value=1;
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else if ((opcode&0xff)==0xa1)
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else if ((opcode&0xff)==0xa1)
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cp_value=0;
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cp_value=0;
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else
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else
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return;
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return;
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key_value=chip8_keys[get_reg_value(opcode)&0x0f];
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key_value=chip8_keys[get_reg_value(opcode)&0x0f];
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if (cp_value==key_value) chip8_regs.pc+=2;
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if (cp_value==key_value)
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chip8_regs.pc+=2;
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}
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}
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static void op_skeq_const (word opcode)
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static void op_skeq_const (word opcode)
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{
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{
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if (get_reg_value(opcode)==(opcode&0xff)) chip8_regs.pc+=2;
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if (get_reg_value(opcode)==(opcode&0xff))
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chip8_regs.pc+=2;
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}
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}
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static void op_skne_const (word opcode)
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static void op_skne_const (word opcode)
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{
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{
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if (get_reg_value(opcode)!=(opcode&0xff)) chip8_regs.pc+=2;
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if (get_reg_value(opcode)!=(opcode&0xff))
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chip8_regs.pc+=2;
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}
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}
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static void op_skeq_reg (word opcode)
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static void op_skeq_reg (word opcode)
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{
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{
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if (get_reg_value(opcode)==get_reg_value_2(opcode)) chip8_regs.pc+=2;
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if (get_reg_value(opcode)==get_reg_value_2(opcode))
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chip8_regs.pc+=2;
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}
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}
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static void op_skne_reg (word opcode)
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static void op_skne_reg (word opcode)
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{
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{
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if (get_reg_value(opcode)!=get_reg_value_2(opcode)) chip8_regs.pc+=2;
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if (get_reg_value(opcode)!=get_reg_value_2(opcode))
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chip8_regs.pc+=2;
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}
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}
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static void op_mov_const (word opcode)
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static void op_mov_const (word opcode)
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{
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{
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*get_reg_offset(opcode)=opcode&0xff;
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*get_reg_offset(opcode)=opcode&0xff;
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}
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}
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static void op_add_const (word opcode)
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static void op_add_const (word opcode)
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{
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{
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*get_reg_offset(opcode)+=opcode&0xff;
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*get_reg_offset(opcode)+=opcode&0xff;
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}
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}
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static void op_mvi (word opcode)
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static void op_mvi (word opcode)
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{
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{
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chip8_regs.i=opcode;
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chip8_regs.i=opcode;
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}
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}
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static void op_jmi (word opcode)
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static void op_jmi (word opcode)
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{
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{
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chip8_regs.pc=opcode+chip8_regs.alg[0];
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chip8_regs.pc=opcode+chip8_regs.alg[0];
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}
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}
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static void op_rand (word opcode)
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static void op_rand (word opcode)
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{
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{
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*get_reg_offset(opcode)=rb->rand()&(opcode&0xff);
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*get_reg_offset(opcode)=rb->rand()&(opcode&0xff);
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}
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}
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static void math_or (byte *reg1,byte reg2)
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static void math_or (byte *reg1,byte reg2)
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{
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{
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*reg1|=reg2;
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*reg1|=reg2;
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}
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}
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static void math_mov (byte *reg1,byte reg2)
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static void math_mov (byte *reg1,byte reg2)
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{
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{
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*reg1=reg2;
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*reg1=reg2;
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}
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}
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static void math_nop (byte *reg1,byte reg2)
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static void math_nop (byte *reg1,byte reg2)
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{
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{
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(void)reg1;
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(void)reg1;
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(void)reg2;
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(void)reg2;
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}
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}
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static void math_and (byte *reg1,byte reg2)
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static void math_and (byte *reg1,byte reg2)
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{
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{
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*reg1&=reg2;
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*reg1&=reg2;
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}
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}
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static void math_xor (byte *reg1,byte reg2)
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static void math_xor (byte *reg1,byte reg2)
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@ -172,168 +176,172 @@ static void math_xor (byte *reg1,byte reg2)
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static void math_add (byte *reg1,byte reg2)
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static void math_add (byte *reg1,byte reg2)
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{
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{
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word tmp;
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word tmp;
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tmp=*reg1+reg2;
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tmp=*reg1+reg2;
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*reg1=(byte)tmp;
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*reg1=(byte)tmp;
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chip8_regs.alg[15]=tmp>>8;
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chip8_regs.alg[15]=tmp>>8;
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}
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}
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static void math_sub (byte *reg1,byte reg2)
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static void math_sub (byte *reg1,byte reg2)
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{
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{
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word tmp;
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word tmp;
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tmp=*reg1-reg2;
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tmp=*reg1-reg2;
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*reg1=(byte)tmp;
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*reg1=(byte)tmp;
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chip8_regs.alg[15]=((byte)(tmp>>8))+1;
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chip8_regs.alg[15]=((byte)(tmp>>8))+1;
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}
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}
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static void math_shr (byte *reg1,byte reg2)
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static void math_shr (byte *reg1,byte reg2)
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{
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{
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(void)reg2;
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(void)reg2;
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chip8_regs.alg[15]=*reg1&1;
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chip8_regs.alg[15]=*reg1&1;
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*reg1>>=1;
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*reg1>>=1;
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}
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}
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static void math_shl (byte *reg1,byte reg2)
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static void math_shl (byte *reg1,byte reg2)
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{
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{
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(void)reg2;
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(void)reg2;
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chip8_regs.alg[15]=*reg1>>7;
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chip8_regs.alg[15]=*reg1>>7;
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*reg1<<=1;
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*reg1<<=1;
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}
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}
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static void math_rsb (byte *reg1,byte reg2)
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static void math_rsb (byte *reg1,byte reg2)
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{
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{
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word tmp;
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word tmp;
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tmp=reg2-*reg1;
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tmp=reg2-*reg1;
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*reg1=(byte)tmp;
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*reg1=(byte)tmp;
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chip8_regs.alg[15]=((byte)(tmp>>8))+1;
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chip8_regs.alg[15]=((byte)(tmp>>8))+1;
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}
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}
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static void op_system (word opcode)
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static void op_system (word opcode)
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{
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{
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switch ((byte)opcode)
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switch ((byte)opcode)
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{
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{
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case 0xe0:
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case 0xe0:
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rb->memset (chip8_display,0,sizeof(chip8_display));
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rb->memset (chip8_display,0,sizeof(chip8_display));
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break;
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break;
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case 0xee:
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case 0xee:
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chip8_regs.pc=read_mem(chip8_regs.sp)<<8;
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chip8_regs.pc=read_mem(chip8_regs.sp)<<8;
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chip8_regs.sp++;
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chip8_regs.sp++;
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chip8_regs.pc+=read_mem(chip8_regs.sp);
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chip8_regs.pc+=read_mem(chip8_regs.sp);
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chip8_regs.sp++;
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chip8_regs.sp++;
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break;
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break;
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}
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}
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}
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}
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static void op_misc (word opcode)
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static void op_misc (word opcode)
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{
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{
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byte *reg,i,j;
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byte *reg,i,j;
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reg=get_reg_offset(opcode);
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reg=get_reg_offset(opcode);
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switch ((byte)opcode)
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switch ((byte)opcode)
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{
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{
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case 0x07:
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case 0x07:
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*reg=chip8_regs.delay;
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*reg=chip8_regs.delay;
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break;
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break;
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case 0x0a:
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case 0x0a:
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if (chip8_key_pressed)
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if (chip8_key_pressed)
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*reg=chip8_key_pressed-1;
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*reg=chip8_key_pressed-1;
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else
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else
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chip8_regs.pc-=2;
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chip8_regs.pc-=2;
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break;
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break;
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case 0x15:
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case 0x15:
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chip8_regs.delay=*reg;
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chip8_regs.delay=*reg;
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break;
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break;
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case 0x18:
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case 0x18:
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chip8_regs.sound=*reg;
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chip8_regs.sound=*reg;
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if (chip8_regs.sound) chip8_sound_on();
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if (chip8_regs.sound)
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break;
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chip8_sound_on();
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case 0x1e:
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break;
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chip8_regs.i+=(*reg);
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case 0x1e:
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break;
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chip8_regs.i+=(*reg);
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case 0x29:
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break;
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chip8_regs.i=((word)(*reg&0x0f))*5;
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case 0x29:
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break;
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chip8_regs.i=((word)(*reg&0x0f))*5;
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case 0x33:
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break;
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i=*reg;
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case 0x33:
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for (j=0;i>=100;i-=100) j++;
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i=*reg;
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write_mem (chip8_regs.i,j);
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for (j=0;i>=100;i-=100)
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for (j=0;i>=10;i-=10) j++;
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j++;
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write_mem (chip8_regs.i+1,j);
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write_mem (chip8_regs.i,j);
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write_mem (chip8_regs.i+2,i);
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for (j=0;i>=10;i-=10)
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break;
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j++;
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case 0x55:
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write_mem (chip8_regs.i+1,j);
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for (i=0,j=(opcode>>8)&0x0f;i<=j;++i)
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write_mem (chip8_regs.i+2,i);
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write_mem(chip8_regs.i+i,chip8_regs.alg[i]);
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break;
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break;
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case 0x55:
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case 0x65:
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for (i=0,j=(opcode>>8)&0x0f; i<=j; ++i)
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for (i=0,j=(opcode>>8)&0x0f;i<=j;++i)
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write_mem(chip8_regs.i+i,chip8_regs.alg[i]);
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chip8_regs.alg[i]=read_mem(chip8_regs.i+i);
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break;
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break;
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case 0x65:
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}
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for (i=0,j=(opcode>>8)&0x0f; i<=j; ++i)
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chip8_regs.alg[i]=read_mem(chip8_regs.i+i);
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break;
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}
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}
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}
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static void op_sprite (word opcode)
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static void op_sprite (word opcode)
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{
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{
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byte *q;
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byte *q;
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byte n,x,x2,y,collision;
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byte n,x,x2,y,collision;
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word p;
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word p;
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x=get_reg_value(opcode)&63;
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x=get_reg_value(opcode)&63;
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y=get_reg_value_2(opcode)&31;
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y=get_reg_value_2(opcode)&31;
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p=chip8_regs.i;
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p=chip8_regs.i;
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q=chip8_display+y*64;
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q=chip8_display+y*64;
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n=opcode&0x0f;
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n=opcode&0x0f;
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if (n+y>32) n=32-y;
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if (n+y>32)
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for (collision=1;n;--n,q+=64)
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n=32-y;
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{
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for (collision=1;n;--n,q+=64)
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for (y=read_mem(p++),x2=x;y;y<<=1,x2=(x2+1)&63)
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{
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if (y&0x80) collision&=(q[x2]^=0xff);
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for (y=read_mem(p++),x2=x;y;y<<=1,x2=(x2+1)&63)
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}
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if (y&0x80) collision&=(q[x2]^=0xff);
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chip8_regs.alg[15]=collision^1;
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}
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chip8_regs.alg[15]=collision^1;
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}
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}
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static math_fn math_opcodes[16]=
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static math_fn math_opcodes[16]=
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{
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{
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math_mov,
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math_mov,
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math_or,
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math_or,
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math_and,
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math_and,
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math_xor,
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math_xor,
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math_add,
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math_add,
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math_sub,
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math_sub,
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math_shr,
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math_shr,
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math_rsb,
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math_rsb,
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math_nop,
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math_nop,
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math_nop,
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math_nop,
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math_nop,
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math_nop,
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math_nop,
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math_nop,
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math_nop,
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math_nop,
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math_nop,
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math_nop,
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math_shl,
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math_shl,
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math_nop
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math_nop
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};
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};
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static void op_math (word opcode)
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static void op_math (word opcode)
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{
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{
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(*(math_opcodes[opcode&0x0f]))
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(*(math_opcodes[opcode&0x0f]))
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(get_reg_offset(opcode),get_reg_value_2(opcode));
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(get_reg_offset(opcode),get_reg_value_2(opcode));
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}
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}
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static opcode_fn main_opcodes[16]=
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static opcode_fn main_opcodes[16]=
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{
|
{
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op_system,
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op_system,
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op_jmp,
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op_jmp,
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op_call,
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op_call,
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op_skeq_const,
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op_skeq_const,
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op_skne_const,
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op_skne_const,
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op_skeq_reg,
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op_skeq_reg,
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op_mov_const,
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op_mov_const,
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op_add_const,
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op_add_const,
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op_math,
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op_math,
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op_skne_reg,
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op_skne_reg,
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op_mvi,
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op_mvi,
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op_jmi,
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op_jmi,
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op_rand,
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op_rand,
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op_sprite,
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op_sprite,
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op_key,
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op_key,
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op_misc
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op_misc
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};
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};
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/****************************************************************************/
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/****************************************************************************/
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|
|
@ -341,37 +349,36 @@ static opcode_fn main_opcodes[16]=
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/****************************************************************************/
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/****************************************************************************/
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static void chip8_update_display(void)
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static void chip8_update_display(void)
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{
|
{
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int x,y,i;
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int x,y,i;
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byte w;
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byte w;
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byte* row;
|
byte* row;
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||||||
|
|
||||||
for (y=0;y<=7;++y) /* 32 rows */
|
for (y=0;y<=7;++y) /* 32 rows */
|
||||||
{
|
|
||||||
row = lcd_framebuf[y];
|
|
||||||
for (x=0;x<64;++x) /* 64 columns */
|
|
||||||
{
|
|
||||||
w = 0;
|
|
||||||
for (i=0;i<=3;i++)
|
|
||||||
{
|
{
|
||||||
w = w >> 2;
|
row = lcd_framebuf[y];
|
||||||
if (chip8_display[x+(y*4+i)*64] != 0)
|
for (x=0;x<64;++x) /* 64 columns */
|
||||||
{
|
{
|
||||||
w += 128+64;
|
w = 0;
|
||||||
}
|
for (i=0;i<=3;i++)
|
||||||
|
{
|
||||||
|
w = w >> 2;
|
||||||
|
if (chip8_display[x+(y*4+i)*64] != 0)
|
||||||
|
{
|
||||||
|
w += 128+64;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
*row++ = w;
|
||||||
|
}
|
||||||
}
|
}
|
||||||
*row++ = w;
|
rb->lcd_blit(lcd_framebuf[0], 24, 0, 64, 8, 64);
|
||||||
}
|
|
||||||
}
|
|
||||||
rb->lcd_blit(lcd_framebuf[0], 24, 0, 64, 8, 64);
|
|
||||||
}
|
}
|
||||||
|
|
||||||
|
|
||||||
static void chip8_keyboard(void)
|
static void chip8_keyboard(void)
|
||||||
{
|
{
|
||||||
switch (rb->button_get(false))
|
switch (rb->button_get(false))
|
||||||
{
|
{
|
||||||
case BUTTON_OFF: /* Abort Emulator */
|
case BUTTON_OFF: /* Abort Emulator */
|
||||||
chip8_running = false;
|
chip8_running = false;
|
||||||
break;
|
break;
|
||||||
|
|
||||||
case BUTTON_UP: chip8_keys[2] = 1; break;
|
case BUTTON_UP: chip8_keys[2] = 1; break;
|
||||||
|
|
@ -408,30 +415,34 @@ static void chip8_keyboard(void)
|
||||||
/****************************************************************************/
|
/****************************************************************************/
|
||||||
static void chip8_execute(void)
|
static void chip8_execute(void)
|
||||||
{
|
{
|
||||||
byte i;
|
byte i;
|
||||||
byte key_pressed=0;
|
byte key_pressed=0;
|
||||||
word opcode;
|
word opcode;
|
||||||
for (i = chip8_iperiod ; i ;--i)
|
for (i = chip8_iperiod ; i ;--i)
|
||||||
{ /* Fetch the opcode */
|
{ /* Fetch the opcode */
|
||||||
opcode=(read_mem(chip8_regs.pc)<<8)+read_mem(chip8_regs.pc+1);
|
opcode=(read_mem(chip8_regs.pc)<<8)+read_mem(chip8_regs.pc+1);
|
||||||
|
|
||||||
chip8_regs.pc+=2;
|
chip8_regs.pc+=2;
|
||||||
(*(main_opcodes[opcode>>12]))(opcode&0x0fff); /* Emulate this opcode */
|
(*(main_opcodes[opcode>>12]))(opcode&0x0fff); /* Emulate this opcode */
|
||||||
}
|
}
|
||||||
/* Update timers */
|
/* Update timers */
|
||||||
if (chip8_regs.delay) --chip8_regs.delay;
|
if (chip8_regs.delay)
|
||||||
if (chip8_regs.sound) --chip8_regs.sound; /* How could we make sound on the archos? */
|
--chip8_regs.delay;
|
||||||
|
|
||||||
|
if (chip8_regs.sound)
|
||||||
|
--chip8_regs.sound; /* How could we make sound on the archos? */
|
||||||
/* Update the machine status */
|
/* Update the machine status */
|
||||||
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 */
|
||||||
|
|
||||||
for (i=key_pressed=0;i<16;++i) /* check if a key was first */
|
for (i=key_pressed=0;i<16;++i) /* check if a key was first */
|
||||||
if (chip8_keys[i]) key_pressed=i+1; /* pressed */
|
if (chip8_keys[i])
|
||||||
if (key_pressed && key_pressed!=chip8_key_pressed)
|
key_pressed=i+1; /* pressed */
|
||||||
chip8_key_pressed=key_pressed;
|
if (key_pressed && key_pressed!=chip8_key_pressed)
|
||||||
else
|
chip8_key_pressed=key_pressed;
|
||||||
chip8_key_pressed=0;
|
else
|
||||||
|
chip8_key_pressed=0;
|
||||||
}
|
}
|
||||||
|
|
||||||
/****************************************************************************/
|
/****************************************************************************/
|
||||||
|
|
@ -439,32 +450,32 @@ static void chip8_execute(void)
|
||||||
/****************************************************************************/
|
/****************************************************************************/
|
||||||
static void chip8_reset(void)
|
static void chip8_reset(void)
|
||||||
{
|
{
|
||||||
static byte chip8_sprites[16*5]=
|
static byte chip8_sprites[16*5]=
|
||||||
{
|
{
|
||||||
0xf9,0x99,0xf2,0x62,0x27,
|
0xf9,0x99,0xf2,0x62,0x27,
|
||||||
0xf1,0xf8,0xff,0x1f,0x1f,
|
0xf1,0xf8,0xff,0x1f,0x1f,
|
||||||
0x99,0xf1,0x1f,0x8f,0x1f,
|
0x99,0xf1,0x1f,0x8f,0x1f,
|
||||||
0xf8,0xf9,0xff,0x12,0x44,
|
0xf8,0xf9,0xff,0x12,0x44,
|
||||||
0xf9,0xf9,0xff,0x9f,0x1f,
|
0xf9,0xf9,0xff,0x9f,0x1f,
|
||||||
0xf9,0xf9,0x9e,0x9e,0x9e,
|
0xf9,0xf9,0x9e,0x9e,0x9e,
|
||||||
0xf8,0x88,0xfe,0x99,0x9e,
|
0xf8,0x88,0xfe,0x99,0x9e,
|
||||||
0xf8,0xf8,0xff,0x8f,0x88,
|
0xf8,0xf8,0xff,0x8f,0x88,
|
||||||
};
|
};
|
||||||
byte i;
|
byte i;
|
||||||
for (i=0;i<16*5;++i)
|
for (i=0;i<16*5;++i)
|
||||||
{
|
{
|
||||||
write_mem (i<<1,chip8_sprites[i]&0xf0);
|
write_mem (i<<1,chip8_sprites[i]&0xf0);
|
||||||
write_mem ((i<<1)+1,chip8_sprites[i]<<4);
|
write_mem ((i<<1)+1,chip8_sprites[i]<<4);
|
||||||
}
|
}
|
||||||
rb->memset (chip8_regs.alg,0,sizeof(chip8_regs.alg));
|
rb->memset (chip8_regs.alg,0,sizeof(chip8_regs.alg));
|
||||||
rb->memset (chip8_keys,0,sizeof(chip8_keys));
|
rb->memset (chip8_keys,0,sizeof(chip8_keys));
|
||||||
chip8_key_pressed=0;
|
chip8_key_pressed=0;
|
||||||
rb->memset (chip8_display,0,sizeof(chip8_display));
|
rb->memset (chip8_display,0,sizeof(chip8_display));
|
||||||
chip8_regs.delay=chip8_regs.sound=chip8_regs.i=0;
|
chip8_regs.delay=chip8_regs.sound=chip8_regs.i=0;
|
||||||
chip8_regs.sp=0x1e0;
|
chip8_regs.sp=0x1e0;
|
||||||
chip8_regs.pc=0x200;
|
chip8_regs.pc=0x200;
|
||||||
chip8_sound_off ();
|
chip8_sound_off ();
|
||||||
chip8_running=1;
|
chip8_running=1;
|
||||||
}
|
}
|
||||||
|
|
||||||
static bool chip8_init(char* file)
|
static bool chip8_init(char* file)
|
||||||
|
|
@ -541,5 +552,4 @@ enum plugin_status plugin_start(struct plugin_api* api, void* parameter)
|
||||||
return chip8_run(filename) ? PLUGIN_OK : PLUGIN_ERROR;
|
return chip8_run(filename) ? PLUGIN_OK : PLUGIN_ERROR;
|
||||||
}
|
}
|
||||||
|
|
||||||
#endif // #ifdef HAVE_LCD_BITMAP
|
#endif /* #ifdef HAVE_LCD_BITMAP */
|
||||||
#endif // #ifndef SIMULATOR
|
|
||||||
|
|
|
||||||
Loading…
Add table
Add a link
Reference in a new issue