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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[4*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_ram2M, 0, sizeof(Pico_mcd->word_ram2M)); |
35 | memset(Pico_mcd->pcm_ram, 0, sizeof(Pico_mcd->pcm_ram)); |
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36 | if (hard) { |
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37 | int fmt_size = sizeof(formatted_bram); |
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38 | memset(Pico_mcd->bram, 0, sizeof(Pico_mcd->bram)); |
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39 | memcpy(Pico_mcd->bram + sizeof(Pico_mcd->bram) - fmt_size, formatted_bram, fmt_size); |
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40 | } |
41 | memset(Pico_mcd->s68k_regs, 0, sizeof(Pico_mcd->s68k_regs)); |
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42 | memset(&Pico_mcd->pcm, 0, sizeof(Pico_mcd->pcm)); |
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43 | |
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44 | *(unsigned int *)(Pico_mcd->bios + 0x70) = 0xffffffff; // reset hint vector (simplest way to implement reg6) |
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45 | Pico_mcd->m.state_flags |= 2; // s68k reset pending |
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46 | Pico_mcd->s68k_regs[3] = 1; // 2M word RAM mode with m68k access after reset |
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47 | Pico_mcd->m.counter75hz = 0; |
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48 | |
49 | LC89510_Reset(); |
50 | Reset_CD(); |
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51 | gfx_cd_reset(); |
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52 | |
53 | return 0; |
54 | } |
55 | |
56 | static __inline void SekRun(int cyc) |
57 | { |
58 | int cyc_do; |
59 | SekCycleAim+=cyc; |
60 | if((cyc_do=SekCycleAim-SekCycleCnt) < 0) return; |
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61 | #if defined(EMU_C68K) |
62 | PicoCpu.cycles=cyc_do; |
63 | CycloneRun(&PicoCpu); |
64 | SekCycleCnt+=cyc_do-PicoCpu.cycles; |
65 | #elif defined(EMU_M68K) |
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66 | m68k_set_context(&PicoM68kCPU); |
67 | SekCycleCnt+=m68k_execute(cyc_do); |
68 | #endif |
69 | } |
70 | |
71 | static __inline void SekRunS68k(int cyc) |
72 | { |
73 | int cyc_do; |
74 | SekCycleAimS68k+=cyc; |
75 | if((cyc_do=SekCycleAimS68k-SekCycleCntS68k) < 0) return; |
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76 | #if defined(EMU_C68K) |
77 | PicoCpuS68k.cycles=cyc_do; |
78 | CycloneRun(&PicoCpuS68k); |
79 | SekCycleCntS68k+=cyc_do-PicoCpuS68k.cycles; |
80 | #elif defined(EMU_M68K) |
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81 | m68k_set_context(&PicoS68kCPU); |
82 | SekCycleCntS68k+=m68k_execute(cyc_do); |
83 | #endif |
84 | } |
85 | |
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86 | #define PS_STEP_M68K ((488<<16)/20) // ~24 |
87 | //#define PS_STEP_S68K 13 |
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88 | |
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89 | #ifndef _ASM_CD_PICO_C |
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90 | static __inline void SekRunPS(int cyc_m68k, int cyc_s68k) |
91 | { |
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92 | int cycn, cycn_s68k, cyc_do; |
93 | int d_cm = 0, d_cs = 0, ex; |
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94 | SekCycleAim+=cyc_m68k; |
95 | SekCycleAimS68k+=cyc_s68k; |
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96 | |
97 | // fprintf(stderr, "=== start %3i/%3i [%3i/%3i] {%05i.%i} ===\n", cyc_m68k, cyc_s68k, |
98 | // SekCycleAim-SekCycleCnt, SekCycleAimS68k-SekCycleCntS68k, Pico.m.frame_count, Pico.m.scanline); |
99 | |
100 | /* loop 488 downto 0 in steps of PS_STEP */ |
101 | for (cycn = (488<<16)-PS_STEP_M68K; cycn >= 0; cycn -= PS_STEP_M68K) |
102 | { |
103 | ex = 0; |
104 | cycn_s68k = (cycn + cycn/2 + cycn/8) >> 16; |
105 | //fprintf(stderr, "%3i/%3i: ", cycn>>16, cycn_s68k); |
106 | if ((cyc_do = SekCycleAim-SekCycleCnt-(cycn>>16)) > 0) { |
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107 | #if defined(EMU_C68K) |
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108 | PicoCpu.cycles = cyc_do; |
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109 | CycloneRun(&PicoCpu); |
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110 | SekCycleCnt += cyc_do - PicoCpu.cycles; |
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111 | #elif defined(EMU_M68K) |
112 | m68k_set_context(&PicoM68kCPU); |
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113 | SekCycleCnt += (ex = m68k_execute(cyc_do)); |
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114 | #endif |
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115 | } |
116 | //fprintf(stderr, "%3i ", ex); d_cm += ex; ex = 0; |
117 | if ((cyc_do = SekCycleAimS68k-SekCycleCntS68k-cycn_s68k) > 0) { |
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118 | #if defined(EMU_C68K) |
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119 | PicoCpuS68k.cycles = cyc_do; |
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120 | CycloneRun(&PicoCpuS68k); |
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121 | SekCycleCntS68k += cyc_do - PicoCpuS68k.cycles; |
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122 | #elif defined(EMU_M68K) |
123 | m68k_set_context(&PicoS68kCPU); |
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124 | SekCycleCntS68k += (ex = m68k_execute(cyc_do)); |
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125 | #endif |
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126 | } |
127 | //fprintf(stderr, "%3i\n", ex); d_cs += ex; |
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128 | } |
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129 | |
130 | //fprintf(stderr, "== end %3i/%3i ==\n", d_cm, d_cs); |
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131 | } |
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132 | #else |
133 | void SekRunPS(int cyc_m68k, int cyc_s68k); |
134 | #endif |
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135 | |
136 | |
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137 | static __inline void check_cd_dma(void) |
138 | { |
139 | int ddx; |
140 | |
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141 | if (!(Pico_mcd->scd.Status_CDC & 0x08)) return; |
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142 | |
143 | ddx = Pico_mcd->s68k_regs[4] & 7; |
144 | if (ddx < 2) return; // invalid |
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145 | if (ddx < 4) { |
146 | Pico_mcd->s68k_regs[4] |= 0x40; // Data set ready in host port |
147 | return; |
148 | } |
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149 | if (ddx == 6) return; // invalid |
150 | |
151 | Update_CDC_TRansfer(ddx); // now go and do the actual transfer |
152 | } |
153 | |
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154 | static __inline void update_chips(void) |
155 | { |
156 | int counter_timer, int3_set; |
157 | int counter75hz_lim = Pico.m.pal ? 2080 : 2096; |
158 | |
159 | // 75Hz CDC update |
160 | if ((Pico_mcd->m.counter75hz+=10) >= counter75hz_lim) { |
161 | Pico_mcd->m.counter75hz -= counter75hz_lim; |
162 | Check_CD_Command(); |
163 | } |
164 | |
165 | // update timers |
166 | counter_timer = Pico.m.pal ? 0x21630 : 0x2121c; // 136752 : 135708; |
167 | Pico_mcd->m.timer_stopwatch += counter_timer; |
168 | if ((int3_set = Pico_mcd->s68k_regs[0x31])) { |
169 | Pico_mcd->m.timer_int3 -= counter_timer; |
170 | if (Pico_mcd->m.timer_int3 < 0) { |
171 | if (Pico_mcd->s68k_regs[0x33] & (1<<3)) { |
172 | dprintf("s68k: timer irq 3"); |
173 | SekInterruptS68k(3); |
174 | Pico_mcd->m.timer_int3 += int3_set << 16; |
175 | } |
176 | // is this really what happens if irq3 is masked out? |
177 | Pico_mcd->m.timer_int3 &= 0xffffff; |
178 | } |
179 | } |
180 | |
181 | // update gfx chip |
182 | if (Pico_mcd->rot_comp.Reg_58 & 0x8000) |
183 | gfx_cd_update(); |
184 | } |
185 | |
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186 | |
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187 | static int PicoFrameHintsMCD(void) |
188 | { |
189 | struct PicoVideo *pv=&Pico.video; |
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190 | int total_z80=0,lines,y,lines_vis = 224,z80CycleAim = 0,line_sample; |
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191 | const int cycles_68k=488,cycles_z80=228,cycles_s68k=795; // both PAL and NTSC compile to same values |
192 | int skip=PicoSkipFrame || (PicoOpt&0x10); |
193 | int hint; // Hint counter |
194 | |
195 | if(Pico.m.pal) { // |
196 | //cycles_68k = (int) ((double) OSC_PAL / 7 / 50 / 312 + 0.4); // should compile to a constant (488) |
197 | //cycles_z80 = (int) ((double) OSC_PAL / 15 / 50 / 312 + 0.4); // 228 |
198 | lines = 312; // Steve Snake says there are 313 lines, but this seems to also work well |
199 | line_sample = 68; |
200 | if(pv->reg[1]&8) lines_vis = 240; |
201 | } else { |
202 | //cycles_68k = (int) ((double) OSC_NTSC / 7 / 60 / 262 + 0.4); // 488 |
203 | //cycles_z80 = (int) ((double) OSC_NTSC / 15 / 60 / 262 + 0.4); // 228 |
204 | lines = 262; |
205 | line_sample = 93; |
206 | } |
207 | |
208 | SekCyclesReset(); |
209 | SekCyclesResetS68k(); |
210 | //z80ExtraCycles = 0; |
211 | |
212 | if(PicoOpt&4) |
213 | z80CycleAim = 0; |
214 | // z80_resetCycles(); |
215 | |
216 | pv->status&=~0x88; // clear V-Int, come out of vblank |
217 | |
218 | hint=pv->reg[10]; // Load H-Int counter |
219 | //dprintf("-hint: %i", hint); |
220 | |
221 | for (y=0;y<lines;y++) |
222 | { |
223 | Pico.m.scanline=(short)y; |
224 | |
225 | // pad delay (for 6 button pads) |
226 | if(PicoOpt&0x20) { |
227 | if(Pico.m.padDelay[0]++ > 25) Pico.m.padTHPhase[0]=0; |
228 | if(Pico.m.padDelay[1]++ > 25) Pico.m.padTHPhase[1]=0; |
229 | } |
230 | |
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231 | check_cd_dma(); |
232 | |
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233 | // H-Interrupts: |
234 | if(y <= lines_vis && --hint < 0) // y <= lines_vis: Comix Zone, Golden Axe |
235 | { |
236 | //dprintf("rhint:old @ %06x", SekPc); |
237 | hint=pv->reg[10]; // Reload H-Int counter |
238 | pv->pending_ints|=0x10; |
239 | if (pv->reg[0]&0x10) SekInterrupt(4); |
240 | //dprintf("rhint: %i @ %06x [%i|%i]", hint, SekPc, y, SekCycleCnt); |
241 | //dprintf("hint_routine: %x", (*(unsigned short*)(Pico.ram+0x0B84)<<16)|*(unsigned short*)(Pico.ram+0x0B86)); |
242 | } |
243 | |
244 | // V-Interrupt: |
245 | if (y == lines_vis) |
246 | { |
247 | //dprintf("vint: @ %06x [%i|%i]", SekPc, y, SekCycleCnt); |
248 | pv->status|=0x88; // V-Int happened, go into vblank |
249 | 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) |
250 | /*if(Pico.m.z80Run && (PicoOpt&4)) { |
251 | z80CycleAim+=cycles_z80/2; |
252 | total_z80+=z80_run(z80CycleAim-total_z80); |
253 | z80CycleAim-=cycles_z80/2; |
254 | }*/ |
255 | pv->pending_ints|=0x20; |
256 | if(pv->reg[1]&0x20) SekInterrupt(6); |
257 | if(Pico.m.z80Run && (PicoOpt&4)) // ? |
258 | z80_int(); |
259 | //dprintf("zint: [%i|%i] zPC=%04x", Pico.m.scanline, SekCyclesDone(), mz80GetRegisterValue(NULL, 0)); |
260 | } |
261 | |
262 | // decide if we draw this line |
263 | #if CAN_HANDLE_240_LINES |
264 | if(!skip && ((!(pv->reg[1]&8) && y<224) || ((pv->reg[1]&8) && y<240)) ) |
265 | #else |
266 | if(!skip && y<224) |
267 | #endif |
268 | PicoLine(y); |
269 | |
270 | if(PicoOpt&1) |
271 | sound_timers_and_dac(y); |
272 | |
273 | // get samples from sound chips |
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274 | if (y == 224 && PsndOut) { |
275 | int len = sound_render(0, PsndLen); |
276 | if (PicoWriteSound) PicoWriteSound(len); |
277 | // clear sound buffer |
278 | sound_clear(); |
279 | } |
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280 | |
281 | // Run scanline: |
282 | //dprintf("m68k starting exec @ %06x", SekPc); |
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283 | if(Pico.m.dma_bytes) SekCycleCnt+=CheckDMA(); |
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284 | if((PicoOpt & 0x2000) && (Pico_mcd->m.busreq&3) == 1) { |
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285 | SekRunPS(cycles_68k, cycles_s68k); // "better/perfect sync" |
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286 | } else { |
287 | SekRun(cycles_68k); |
288 | if ((Pico_mcd->m.busreq&3) == 1) // no busreq/no reset |
289 | SekRunS68k(cycles_s68k); |
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290 | } |
291 | |
292 | if((PicoOpt&4) && Pico.m.z80Run) { |
293 | Pico.m.z80Run|=2; |
294 | z80CycleAim+=cycles_z80; |
295 | total_z80+=z80_run(z80CycleAim-total_z80); |
296 | } |
297 | |
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298 | update_chips(); |
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299 | } |
300 | |
301 | // draw a frame just after vblank in alternative render mode |
302 | if(!PicoSkipFrame && (PicoOpt&0x10)) |
303 | PicoFrameFull(); |
304 | |
305 | return 0; |
306 | } |
307 | |
308 | |
309 | int PicoFrameMCD(void) |
310 | { |
311 | if(!(PicoOpt&0x10)) |
312 | PicoFrameStart(); |
313 | |
314 | PicoFrameHintsMCD(); |
315 | |
316 | return 0; |
317 | } |
318 | |
319 | |