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1 | // This is part of Pico Library |
2 | |
3 | // (c) Copyright 2004 Dave, All rights reserved. |
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4 | // (c) Copyright 2007 notaz, All rights reserved. |
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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 | |
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14 | extern unsigned char formatted_bram[8*0x10]; |
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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 | { |
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33 | memset(Pico_mcd->prg_ram, 0, sizeof(Pico_mcd->prg_ram)); |
34 | memset(Pico_mcd->word_ram, 0, sizeof(Pico_mcd->word_ram)); |
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35 | memset(Pico_mcd->pcm_ram, 0, sizeof(Pico_mcd->pcm_ram)); |
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36 | if (hard) { |
37 | memset(Pico_mcd->bram, 0, sizeof(Pico_mcd->bram)); |
38 | memcpy(Pico_mcd->bram + sizeof(Pico_mcd->bram) - 8*0x10, formatted_bram, 8*0x10); |
39 | } |
40 | memset(Pico_mcd->s68k_regs, 0, sizeof(Pico_mcd->s68k_regs)); |
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41 | memset(&Pico_mcd->pcm, 0, sizeof(Pico_mcd->pcm)); |
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42 | |
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43 | *(unsigned int *)(Pico_mcd->bios + 0x70) = 0xffffffff; // reset hint vector (simplest way to implement reg6) |
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44 | Pico_mcd->m.state_flags |= 2; // s68k reset pending |
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45 | Pico_mcd->s68k_regs[3] = 1; // 2M word RAM mode with m68k access after reset |
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46 | Pico_mcd->m.counter75hz = 0; |
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47 | |
48 | LC89510_Reset(); |
49 | Reset_CD(); |
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50 | gfx_cd_reset(); |
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51 | |
52 | return 0; |
53 | } |
54 | |
55 | static __inline void SekRun(int cyc) |
56 | { |
57 | int cyc_do; |
58 | SekCycleAim+=cyc; |
59 | if((cyc_do=SekCycleAim-SekCycleCnt) < 0) return; |
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60 | #if defined(EMU_C68K) |
61 | PicoCpu.cycles=cyc_do; |
62 | CycloneRun(&PicoCpu); |
63 | SekCycleCnt+=cyc_do-PicoCpu.cycles; |
64 | #elif defined(EMU_M68K) |
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65 | m68k_set_context(&PicoM68kCPU); |
66 | SekCycleCnt+=m68k_execute(cyc_do); |
67 | #endif |
68 | } |
69 | |
70 | static __inline void SekRunS68k(int cyc) |
71 | { |
72 | int cyc_do; |
73 | SekCycleAimS68k+=cyc; |
74 | if((cyc_do=SekCycleAimS68k-SekCycleCntS68k) < 0) return; |
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75 | #if defined(EMU_C68K) |
76 | PicoCpuS68k.cycles=cyc_do; |
77 | CycloneRun(&PicoCpuS68k); |
78 | SekCycleCntS68k+=cyc_do-PicoCpuS68k.cycles; |
79 | #elif defined(EMU_M68K) |
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80 | m68k_set_context(&PicoS68kCPU); |
81 | SekCycleCntS68k+=m68k_execute(cyc_do); |
82 | #endif |
83 | } |
84 | |
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85 | static __inline void check_cd_dma(void) |
86 | { |
87 | int ddx; |
88 | |
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89 | if (!(Pico_mcd->scd.Status_CDC & 0x08)) return; |
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90 | |
91 | ddx = Pico_mcd->s68k_regs[4] & 7; |
92 | if (ddx < 2) return; // invalid |
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93 | if (ddx < 4) { |
94 | Pico_mcd->s68k_regs[4] |= 0x40; // Data set ready in host port |
95 | return; |
96 | } |
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97 | if (ddx == 6) return; // invalid |
98 | |
99 | Update_CDC_TRansfer(ddx); // now go and do the actual transfer |
100 | } |
101 | |
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102 | static __inline void update_chips(void) |
103 | { |
104 | int counter_timer, int3_set; |
105 | int counter75hz_lim = Pico.m.pal ? 2080 : 2096; |
106 | |
107 | // 75Hz CDC update |
108 | if ((Pico_mcd->m.counter75hz+=10) >= counter75hz_lim) { |
109 | Pico_mcd->m.counter75hz -= counter75hz_lim; |
110 | Check_CD_Command(); |
111 | } |
112 | |
113 | // update timers |
114 | counter_timer = Pico.m.pal ? 0x21630 : 0x2121c; // 136752 : 135708; |
115 | Pico_mcd->m.timer_stopwatch += counter_timer; |
116 | if ((int3_set = Pico_mcd->s68k_regs[0x31])) { |
117 | Pico_mcd->m.timer_int3 -= counter_timer; |
118 | if (Pico_mcd->m.timer_int3 < 0) { |
119 | if (Pico_mcd->s68k_regs[0x33] & (1<<3)) { |
120 | dprintf("s68k: timer irq 3"); |
121 | SekInterruptS68k(3); |
122 | Pico_mcd->m.timer_int3 += int3_set << 16; |
123 | } |
124 | // is this really what happens if irq3 is masked out? |
125 | Pico_mcd->m.timer_int3 &= 0xffffff; |
126 | } |
127 | } |
128 | |
129 | // update gfx chip |
130 | if (Pico_mcd->rot_comp.Reg_58 & 0x8000) |
131 | gfx_cd_update(); |
132 | } |
133 | |
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134 | // to be called on 224 or line_sample scanlines only |
135 | static __inline void getSamples(int y) |
136 | { |
137 | if(y == 224) { |
138 | //dprintf("sta%i: %i [%i]", (emustatus & 2), emustatus, y); |
139 | if(emustatus & 2) |
140 | sound_render(PsndLen/2, PsndLen-PsndLen/2); |
141 | else sound_render(0, PsndLen); |
142 | if (emustatus&1) emustatus|=2; else emustatus&=~2; |
143 | if (PicoWriteSound) PicoWriteSound(); |
144 | // clear sound buffer |
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145 | sound_clear(); |
146 | //memset(PsndOut, 0, (PicoOpt & 8) ? (PsndLen<<2) : (PsndLen<<1)); |
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147 | } |
148 | else if(emustatus & 3) { |
149 | emustatus|= 2; |
150 | emustatus&=~1; |
151 | sound_render(0, PsndLen/2); |
152 | } |
153 | } |
154 | |
155 | |
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156 | static int PicoFrameHintsMCD(void) |
157 | { |
158 | struct PicoVideo *pv=&Pico.video; |
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159 | int total_z80=0,lines,y,lines_vis = 224,z80CycleAim = 0,line_sample; |
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160 | const int cycles_68k=488,cycles_z80=228,cycles_s68k=795; // both PAL and NTSC compile to same values |
161 | int skip=PicoSkipFrame || (PicoOpt&0x10); |
162 | int hint; // Hint counter |
163 | |
164 | if(Pico.m.pal) { // |
165 | //cycles_68k = (int) ((double) OSC_PAL / 7 / 50 / 312 + 0.4); // should compile to a constant (488) |
166 | //cycles_z80 = (int) ((double) OSC_PAL / 15 / 50 / 312 + 0.4); // 228 |
167 | lines = 312; // Steve Snake says there are 313 lines, but this seems to also work well |
168 | line_sample = 68; |
169 | if(pv->reg[1]&8) lines_vis = 240; |
170 | } else { |
171 | //cycles_68k = (int) ((double) OSC_NTSC / 7 / 60 / 262 + 0.4); // 488 |
172 | //cycles_z80 = (int) ((double) OSC_NTSC / 15 / 60 / 262 + 0.4); // 228 |
173 | lines = 262; |
174 | line_sample = 93; |
175 | } |
176 | |
177 | SekCyclesReset(); |
178 | SekCyclesResetS68k(); |
179 | //z80ExtraCycles = 0; |
180 | |
181 | if(PicoOpt&4) |
182 | z80CycleAim = 0; |
183 | // z80_resetCycles(); |
184 | |
185 | pv->status&=~0x88; // clear V-Int, come out of vblank |
186 | |
187 | hint=pv->reg[10]; // Load H-Int counter |
188 | //dprintf("-hint: %i", hint); |
189 | |
190 | for (y=0;y<lines;y++) |
191 | { |
192 | Pico.m.scanline=(short)y; |
193 | |
194 | // pad delay (for 6 button pads) |
195 | if(PicoOpt&0x20) { |
196 | if(Pico.m.padDelay[0]++ > 25) Pico.m.padTHPhase[0]=0; |
197 | if(Pico.m.padDelay[1]++ > 25) Pico.m.padTHPhase[1]=0; |
198 | } |
199 | |
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200 | check_cd_dma(); |
201 | |
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202 | // H-Interrupts: |
203 | if(y <= lines_vis && --hint < 0) // y <= lines_vis: Comix Zone, Golden Axe |
204 | { |
205 | //dprintf("rhint:old @ %06x", SekPc); |
206 | hint=pv->reg[10]; // Reload H-Int counter |
207 | pv->pending_ints|=0x10; |
208 | if (pv->reg[0]&0x10) SekInterrupt(4); |
209 | //dprintf("rhint: %i @ %06x [%i|%i]", hint, SekPc, y, SekCycleCnt); |
210 | //dprintf("hint_routine: %x", (*(unsigned short*)(Pico.ram+0x0B84)<<16)|*(unsigned short*)(Pico.ram+0x0B86)); |
211 | } |
212 | |
213 | // V-Interrupt: |
214 | if (y == lines_vis) |
215 | { |
216 | //dprintf("vint: @ %06x [%i|%i]", SekPc, y, SekCycleCnt); |
217 | pv->status|=0x88; // V-Int happened, go into vblank |
218 | 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) |
219 | /*if(Pico.m.z80Run && (PicoOpt&4)) { |
220 | z80CycleAim+=cycles_z80/2; |
221 | total_z80+=z80_run(z80CycleAim-total_z80); |
222 | z80CycleAim-=cycles_z80/2; |
223 | }*/ |
224 | pv->pending_ints|=0x20; |
225 | if(pv->reg[1]&0x20) SekInterrupt(6); |
226 | if(Pico.m.z80Run && (PicoOpt&4)) // ? |
227 | z80_int(); |
228 | //dprintf("zint: [%i|%i] zPC=%04x", Pico.m.scanline, SekCyclesDone(), mz80GetRegisterValue(NULL, 0)); |
229 | } |
230 | |
231 | // decide if we draw this line |
232 | #if CAN_HANDLE_240_LINES |
233 | if(!skip && ((!(pv->reg[1]&8) && y<224) || ((pv->reg[1]&8) && y<240)) ) |
234 | #else |
235 | if(!skip && y<224) |
236 | #endif |
237 | PicoLine(y); |
238 | |
239 | if(PicoOpt&1) |
240 | sound_timers_and_dac(y); |
241 | |
242 | // get samples from sound chips |
243 | if(y == 32 && PsndOut) |
244 | emustatus &= ~1; |
245 | else if((y == 224 || y == line_sample) && PsndOut) |
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246 | getSamples(y); |
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247 | |
248 | // Run scanline: |
249 | //dprintf("m68k starting exec @ %06x", SekPc); |
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250 | if(Pico.m.dma_bytes) SekCycleCnt+=CheckDMA(); |
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251 | SekRun(cycles_68k); |
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252 | if ((Pico_mcd->m.busreq&3) == 1) { // no busreq/no reset |
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253 | #if 0 |
254 | int i; |
255 | FILE *f = fopen("prg_ram.bin", "wb"); |
256 | for (i = 0; i < 0x80000; i+=2) |
257 | { |
258 | int tmp = Pico_mcd->prg_ram[i]; |
259 | Pico_mcd->prg_ram[i] = Pico_mcd->prg_ram[i+1]; |
260 | Pico_mcd->prg_ram[i+1] = tmp; |
261 | } |
262 | fwrite(Pico_mcd->prg_ram, 1, 0x80000, f); |
263 | fclose(f); |
264 | exit(1); |
265 | #endif |
266 | //dprintf("s68k starting exec @ %06x", SekPcS68k); |
267 | SekRunS68k(cycles_s68k); |
268 | } |
269 | |
270 | if((PicoOpt&4) && Pico.m.z80Run) { |
271 | Pico.m.z80Run|=2; |
272 | z80CycleAim+=cycles_z80; |
273 | total_z80+=z80_run(z80CycleAim-total_z80); |
274 | } |
275 | |
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276 | update_chips(); |
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277 | } |
278 | |
279 | // draw a frame just after vblank in alternative render mode |
280 | if(!PicoSkipFrame && (PicoOpt&0x10)) |
281 | PicoFrameFull(); |
282 | |
283 | return 0; |
284 | } |
285 | |
286 | |
287 | int PicoFrameMCD(void) |
288 | { |
289 | if(!(PicoOpt&0x10)) |
290 | PicoFrameStart(); |
291 | |
292 | PicoFrameHintsMCD(); |
293 | |
294 | return 0; |
295 | } |
296 | |
297 | |