cc68a136 |
1 | // This is part of Pico Library |
2 | |
3 | // (c) Copyright 2004 Dave, All rights reserved. |
4 | // (c) Copyright 2006 notaz, All rights reserved. |
5 | // Free for non-commercial use. |
6 | |
7 | // For commercial use, separate licencing terms must be obtained. |
8 | |
9 | |
10 | #include "../PicoInt.h" |
11 | #include "../sound/sound.h" |
12 | |
13 | |
14 | int counter75hz = 0; |
15 | |
16 | |
17 | int PicoInitMCD(void) |
18 | { |
19 | SekInitS68k(); |
20 | Init_CD_Driver(); |
21 | |
22 | return 0; |
23 | } |
24 | |
25 | |
26 | void PicoExitMCD(void) |
27 | { |
28 | End_CD_Driver(); |
29 | } |
30 | |
31 | int PicoResetMCD(int hard) |
32 | { |
33 | // clear everything except BIOS |
34 | memset(Pico_mcd->prg_ram, 0, sizeof(mcd_state) - sizeof(Pico_mcd->bios)); |
35 | PicoMCD |= 2; // s68k reset pending |
36 | counter75hz = 0; |
37 | |
38 | LC89510_Reset(); |
39 | Reset_CD(); |
40 | |
41 | return 0; |
42 | } |
43 | |
44 | static __inline void SekRun(int cyc) |
45 | { |
46 | int cyc_do; |
47 | SekCycleAim+=cyc; |
48 | if((cyc_do=SekCycleAim-SekCycleCnt) < 0) return; |
49 | #if defined(EMU_M68K) |
50 | m68k_set_context(&PicoM68kCPU); |
51 | SekCycleCnt+=m68k_execute(cyc_do); |
52 | #endif |
53 | } |
54 | |
55 | static __inline void SekRunS68k(int cyc) |
56 | { |
57 | int cyc_do; |
58 | SekCycleAimS68k+=cyc; |
59 | if((cyc_do=SekCycleAimS68k-SekCycleCntS68k) < 0) return; |
60 | #if defined(EMU_M68K) |
61 | m68k_set_context(&PicoS68kCPU); |
62 | SekCycleCntS68k+=m68k_execute(cyc_do); |
63 | #endif |
64 | } |
65 | |
66 | // TODO: tidy |
67 | extern unsigned char m68k_regs[0x40]; |
68 | extern unsigned char s68k_regs[0x200]; |
69 | |
70 | // Accurate but slower frame which does hints |
71 | static int PicoFrameHintsMCD(void) |
72 | { |
73 | struct PicoVideo *pv=&Pico.video; |
74 | int total_z80=0,lines,y,lines_vis = 224,z80CycleAim = 0,line_sample; |
75 | const int cycles_68k=488,cycles_z80=228,cycles_s68k=795; // both PAL and NTSC compile to same values |
76 | int skip=PicoSkipFrame || (PicoOpt&0x10); |
77 | int hint; // Hint counter |
78 | |
79 | if(Pico.m.pal) { // |
80 | //cycles_68k = (int) ((double) OSC_PAL / 7 / 50 / 312 + 0.4); // should compile to a constant (488) |
81 | //cycles_z80 = (int) ((double) OSC_PAL / 15 / 50 / 312 + 0.4); // 228 |
82 | lines = 312; // Steve Snake says there are 313 lines, but this seems to also work well |
83 | line_sample = 68; |
84 | if(pv->reg[1]&8) lines_vis = 240; |
85 | } else { |
86 | //cycles_68k = (int) ((double) OSC_NTSC / 7 / 60 / 262 + 0.4); // 488 |
87 | //cycles_z80 = (int) ((double) OSC_NTSC / 15 / 60 / 262 + 0.4); // 228 |
88 | lines = 262; |
89 | line_sample = 93; |
90 | } |
91 | |
92 | SekCyclesReset(); |
93 | SekCyclesResetS68k(); |
94 | //z80ExtraCycles = 0; |
95 | |
96 | if(PicoOpt&4) |
97 | z80CycleAim = 0; |
98 | // z80_resetCycles(); |
99 | |
100 | pv->status&=~0x88; // clear V-Int, come out of vblank |
101 | |
102 | hint=pv->reg[10]; // Load H-Int counter |
103 | //dprintf("-hint: %i", hint); |
104 | |
105 | for (y=0;y<lines;y++) |
106 | { |
107 | Pico.m.scanline=(short)y; |
108 | |
109 | // pad delay (for 6 button pads) |
110 | if(PicoOpt&0x20) { |
111 | if(Pico.m.padDelay[0]++ > 25) Pico.m.padTHPhase[0]=0; |
112 | if(Pico.m.padDelay[1]++ > 25) Pico.m.padTHPhase[1]=0; |
113 | } |
114 | |
115 | // H-Interrupts: |
116 | if(y <= lines_vis && --hint < 0) // y <= lines_vis: Comix Zone, Golden Axe |
117 | { |
118 | //dprintf("rhint:old @ %06x", SekPc); |
119 | hint=pv->reg[10]; // Reload H-Int counter |
120 | pv->pending_ints|=0x10; |
121 | if (pv->reg[0]&0x10) SekInterrupt(4); |
122 | //dprintf("rhint: %i @ %06x [%i|%i]", hint, SekPc, y, SekCycleCnt); |
123 | //dprintf("hint_routine: %x", (*(unsigned short*)(Pico.ram+0x0B84)<<16)|*(unsigned short*)(Pico.ram+0x0B86)); |
124 | } |
125 | |
126 | // V-Interrupt: |
127 | if (y == lines_vis) |
128 | { |
129 | //dprintf("vint: @ %06x [%i|%i]", SekPc, y, SekCycleCnt); |
130 | pv->status|=0x88; // V-Int happened, go into vblank |
131 | SekRun(128); SekCycleAim-=128; // there must be a gap between H and V ints, also after vblank bit set (Mazin Saga, Bram Stoker's Dracula) |
132 | /*if(Pico.m.z80Run && (PicoOpt&4)) { |
133 | z80CycleAim+=cycles_z80/2; |
134 | total_z80+=z80_run(z80CycleAim-total_z80); |
135 | z80CycleAim-=cycles_z80/2; |
136 | }*/ |
137 | pv->pending_ints|=0x20; |
138 | if(pv->reg[1]&0x20) SekInterrupt(6); |
139 | if(Pico.m.z80Run && (PicoOpt&4)) // ? |
140 | z80_int(); |
141 | //dprintf("zint: [%i|%i] zPC=%04x", Pico.m.scanline, SekCyclesDone(), mz80GetRegisterValue(NULL, 0)); |
142 | } |
143 | |
144 | // decide if we draw this line |
145 | #if CAN_HANDLE_240_LINES |
146 | if(!skip && ((!(pv->reg[1]&8) && y<224) || ((pv->reg[1]&8) && y<240)) ) |
147 | #else |
148 | if(!skip && y<224) |
149 | #endif |
150 | PicoLine(y); |
151 | |
152 | if(PicoOpt&1) |
153 | sound_timers_and_dac(y); |
154 | |
155 | // get samples from sound chips |
156 | if(y == 32 && PsndOut) |
157 | emustatus &= ~1; |
158 | else if((y == 224 || y == line_sample) && PsndOut) |
159 | ;//getSamples(y); |
160 | |
161 | // Run scanline: |
162 | //dprintf("m68k starting exec @ %06x", SekPc); |
163 | SekRun(cycles_68k); |
164 | if ((Pico_mcd->m68k_regs[1]&3) == 1) { // no busreq/no reset |
165 | #if 0 |
166 | int i; |
167 | FILE *f = fopen("prg_ram.bin", "wb"); |
168 | for (i = 0; i < 0x80000; i+=2) |
169 | { |
170 | int tmp = Pico_mcd->prg_ram[i]; |
171 | Pico_mcd->prg_ram[i] = Pico_mcd->prg_ram[i+1]; |
172 | Pico_mcd->prg_ram[i+1] = tmp; |
173 | } |
174 | fwrite(Pico_mcd->prg_ram, 1, 0x80000, f); |
175 | fclose(f); |
176 | exit(1); |
177 | #endif |
178 | //dprintf("s68k starting exec @ %06x", SekPcS68k); |
179 | SekRunS68k(cycles_s68k); |
180 | } |
181 | |
182 | if((PicoOpt&4) && Pico.m.z80Run) { |
183 | Pico.m.z80Run|=2; |
184 | z80CycleAim+=cycles_z80; |
185 | total_z80+=z80_run(z80CycleAim-total_z80); |
186 | } |
187 | |
188 | // if cdd is on, counter elapsed and irq4 is not masked, do irq4 |
189 | if ((Pico_mcd->s68k_regs[0x37]&4) && ++counter75hz > 209 && (Pico_mcd->s68k_regs[0x33]&(1<<4))) { |
190 | counter75hz = 0; |
191 | Check_CD_Command(); |
192 | } |
193 | } |
194 | |
195 | // draw a frame just after vblank in alternative render mode |
196 | if(!PicoSkipFrame && (PicoOpt&0x10)) |
197 | PicoFrameFull(); |
198 | |
199 | return 0; |
200 | } |
201 | |
202 | |
203 | int PicoFrameMCD(void) |
204 | { |
205 | if(!(PicoOpt&0x10)) |
206 | PicoFrameStart(); |
207 | |
208 | PicoFrameHintsMCD(); |
209 | |
210 | return 0; |
211 | } |
212 | |
213 | |