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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 8 |
87 | #define PS_STEP_S68K 13 |
88 | |
89 | static __inline void SekRunPS(int cyc_m68k, int cyc_s68k) |
90 | { |
91 | int cyc_do_m68k, cyc_do_s68k, it=0; |
92 | int cyc_done_m68k=0, cyc_done_s68k=0; |
93 | SekCycleAim+=cyc_m68k; |
94 | SekCycleAimS68k+=cyc_s68k; |
95 | cyc_do_m68k=SekCycleAim-SekCycleCnt; |
96 | cyc_do_s68k=SekCycleAimS68k-SekCycleCntS68k; |
97 | while (cyc_done_m68k < cyc_do_m68k || cyc_done_s68k < cyc_do_s68k) { |
98 | it++; |
99 | if (cyc_done_m68k < cyc_do_m68k && it*PS_STEP_M68K > cyc_done_m68k) { |
100 | #if defined(EMU_C68K) |
101 | PicoCpu.cycles = PS_STEP_M68K; |
102 | CycloneRun(&PicoCpu); |
103 | cyc_done_m68k += PS_STEP_M68K - PicoCpu.cycles; |
104 | #elif defined(EMU_M68K) |
105 | m68k_set_context(&PicoM68kCPU); |
106 | cyc_done_m68k += m68k_execute(PS_STEP_M68K); |
107 | #endif |
108 | } //else dprintf("m68k skipping it #%i", it); |
109 | if (cyc_done_s68k < cyc_do_s68k && it*PS_STEP_S68K > cyc_done_s68k) { |
110 | #if defined(EMU_C68K) |
111 | PicoCpuS68k.cycles = PS_STEP_S68K; |
112 | CycloneRun(&PicoCpuS68k); |
113 | cyc_done_s68k += PS_STEP_S68K - PicoCpuS68k.cycles; |
114 | #elif defined(EMU_M68K) |
115 | m68k_set_context(&PicoS68kCPU); |
116 | cyc_done_s68k += m68k_execute(PS_STEP_S68K); |
117 | #endif |
118 | } //else dprintf("s68k skipping it #%i", it); |
119 | } |
120 | SekCycleCnt += cyc_done_m68k; |
121 | SekCycleCntS68k += cyc_done_s68k; |
122 | //dprintf("== end SekRunPS, it=%i ==", it); |
123 | } |
124 | |
125 | |
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126 | static __inline void check_cd_dma(void) |
127 | { |
128 | int ddx; |
129 | |
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130 | if (!(Pico_mcd->scd.Status_CDC & 0x08)) return; |
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131 | |
132 | ddx = Pico_mcd->s68k_regs[4] & 7; |
133 | if (ddx < 2) return; // invalid |
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134 | if (ddx < 4) { |
135 | Pico_mcd->s68k_regs[4] |= 0x40; // Data set ready in host port |
136 | return; |
137 | } |
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138 | if (ddx == 6) return; // invalid |
139 | |
140 | Update_CDC_TRansfer(ddx); // now go and do the actual transfer |
141 | } |
142 | |
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143 | static __inline void update_chips(void) |
144 | { |
145 | int counter_timer, int3_set; |
146 | int counter75hz_lim = Pico.m.pal ? 2080 : 2096; |
147 | |
148 | // 75Hz CDC update |
149 | if ((Pico_mcd->m.counter75hz+=10) >= counter75hz_lim) { |
150 | Pico_mcd->m.counter75hz -= counter75hz_lim; |
151 | Check_CD_Command(); |
152 | } |
153 | |
154 | // update timers |
155 | counter_timer = Pico.m.pal ? 0x21630 : 0x2121c; // 136752 : 135708; |
156 | Pico_mcd->m.timer_stopwatch += counter_timer; |
157 | if ((int3_set = Pico_mcd->s68k_regs[0x31])) { |
158 | Pico_mcd->m.timer_int3 -= counter_timer; |
159 | if (Pico_mcd->m.timer_int3 < 0) { |
160 | if (Pico_mcd->s68k_regs[0x33] & (1<<3)) { |
161 | dprintf("s68k: timer irq 3"); |
162 | SekInterruptS68k(3); |
163 | Pico_mcd->m.timer_int3 += int3_set << 16; |
164 | } |
165 | // is this really what happens if irq3 is masked out? |
166 | Pico_mcd->m.timer_int3 &= 0xffffff; |
167 | } |
168 | } |
169 | |
170 | // update gfx chip |
171 | if (Pico_mcd->rot_comp.Reg_58 & 0x8000) |
172 | gfx_cd_update(); |
173 | } |
174 | |
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175 | |
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176 | static int PicoFrameHintsMCD(void) |
177 | { |
178 | struct PicoVideo *pv=&Pico.video; |
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179 | int total_z80=0,lines,y,lines_vis = 224,z80CycleAim = 0,line_sample; |
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180 | const int cycles_68k=488,cycles_z80=228,cycles_s68k=795; // both PAL and NTSC compile to same values |
181 | int skip=PicoSkipFrame || (PicoOpt&0x10); |
182 | int hint; // Hint counter |
183 | |
184 | if(Pico.m.pal) { // |
185 | //cycles_68k = (int) ((double) OSC_PAL / 7 / 50 / 312 + 0.4); // should compile to a constant (488) |
186 | //cycles_z80 = (int) ((double) OSC_PAL / 15 / 50 / 312 + 0.4); // 228 |
187 | lines = 312; // Steve Snake says there are 313 lines, but this seems to also work well |
188 | line_sample = 68; |
189 | if(pv->reg[1]&8) lines_vis = 240; |
190 | } else { |
191 | //cycles_68k = (int) ((double) OSC_NTSC / 7 / 60 / 262 + 0.4); // 488 |
192 | //cycles_z80 = (int) ((double) OSC_NTSC / 15 / 60 / 262 + 0.4); // 228 |
193 | lines = 262; |
194 | line_sample = 93; |
195 | } |
196 | |
197 | SekCyclesReset(); |
198 | SekCyclesResetS68k(); |
199 | //z80ExtraCycles = 0; |
200 | |
201 | if(PicoOpt&4) |
202 | z80CycleAim = 0; |
203 | // z80_resetCycles(); |
204 | |
205 | pv->status&=~0x88; // clear V-Int, come out of vblank |
206 | |
207 | hint=pv->reg[10]; // Load H-Int counter |
208 | //dprintf("-hint: %i", hint); |
209 | |
210 | for (y=0;y<lines;y++) |
211 | { |
212 | Pico.m.scanline=(short)y; |
213 | |
214 | // pad delay (for 6 button pads) |
215 | if(PicoOpt&0x20) { |
216 | if(Pico.m.padDelay[0]++ > 25) Pico.m.padTHPhase[0]=0; |
217 | if(Pico.m.padDelay[1]++ > 25) Pico.m.padTHPhase[1]=0; |
218 | } |
219 | |
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220 | check_cd_dma(); |
221 | |
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222 | // H-Interrupts: |
223 | if(y <= lines_vis && --hint < 0) // y <= lines_vis: Comix Zone, Golden Axe |
224 | { |
225 | //dprintf("rhint:old @ %06x", SekPc); |
226 | hint=pv->reg[10]; // Reload H-Int counter |
227 | pv->pending_ints|=0x10; |
228 | if (pv->reg[0]&0x10) SekInterrupt(4); |
229 | //dprintf("rhint: %i @ %06x [%i|%i]", hint, SekPc, y, SekCycleCnt); |
230 | //dprintf("hint_routine: %x", (*(unsigned short*)(Pico.ram+0x0B84)<<16)|*(unsigned short*)(Pico.ram+0x0B86)); |
231 | } |
232 | |
233 | // V-Interrupt: |
234 | if (y == lines_vis) |
235 | { |
236 | //dprintf("vint: @ %06x [%i|%i]", SekPc, y, SekCycleCnt); |
237 | pv->status|=0x88; // V-Int happened, go into vblank |
238 | 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) |
239 | /*if(Pico.m.z80Run && (PicoOpt&4)) { |
240 | z80CycleAim+=cycles_z80/2; |
241 | total_z80+=z80_run(z80CycleAim-total_z80); |
242 | z80CycleAim-=cycles_z80/2; |
243 | }*/ |
244 | pv->pending_ints|=0x20; |
245 | if(pv->reg[1]&0x20) SekInterrupt(6); |
246 | if(Pico.m.z80Run && (PicoOpt&4)) // ? |
247 | z80_int(); |
248 | //dprintf("zint: [%i|%i] zPC=%04x", Pico.m.scanline, SekCyclesDone(), mz80GetRegisterValue(NULL, 0)); |
249 | } |
250 | |
251 | // decide if we draw this line |
252 | #if CAN_HANDLE_240_LINES |
253 | if(!skip && ((!(pv->reg[1]&8) && y<224) || ((pv->reg[1]&8) && y<240)) ) |
254 | #else |
255 | if(!skip && y<224) |
256 | #endif |
257 | PicoLine(y); |
258 | |
259 | if(PicoOpt&1) |
260 | sound_timers_and_dac(y); |
261 | |
262 | // get samples from sound chips |
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263 | if (y == 224 && PsndOut) { |
264 | int len = sound_render(0, PsndLen); |
265 | if (PicoWriteSound) PicoWriteSound(len); |
266 | // clear sound buffer |
267 | sound_clear(); |
268 | } |
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269 | |
270 | // Run scanline: |
271 | //dprintf("m68k starting exec @ %06x", SekPc); |
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272 | if(Pico.m.dma_bytes) SekCycleCnt+=CheckDMA(); |
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273 | if((PicoOpt & 0x2000) && (Pico_mcd->m.busreq&3) == 1) { |
274 | SekRunPS(cycles_68k, cycles_s68k); // "perfect sync" |
275 | } else { |
276 | SekRun(cycles_68k); |
277 | if ((Pico_mcd->m.busreq&3) == 1) // no busreq/no reset |
278 | SekRunS68k(cycles_s68k); |
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279 | } |
280 | |
281 | if((PicoOpt&4) && Pico.m.z80Run) { |
282 | Pico.m.z80Run|=2; |
283 | z80CycleAim+=cycles_z80; |
284 | total_z80+=z80_run(z80CycleAim-total_z80); |
285 | } |
286 | |
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287 | update_chips(); |
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288 | } |
289 | |
290 | // draw a frame just after vblank in alternative render mode |
291 | if(!PicoSkipFrame && (PicoOpt&0x10)) |
292 | PicoFrameFull(); |
293 | |
294 | return 0; |
295 | } |
296 | |
297 | |
298 | int PicoFrameMCD(void) |
299 | { |
300 | if(!(PicoOpt&0x10)) |
301 | PicoFrameStart(); |
302 | |
303 | PicoFrameHintsMCD(); |
304 | |
305 | return 0; |
306 | } |
307 | |
308 | |