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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 | if (hard) { |
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34 | int fmt_size = sizeof(formatted_bram); |
35 | memset(Pico_mcd->prg_ram, 0, sizeof(Pico_mcd->prg_ram)); |
36 | memset(Pico_mcd->word_ram2M, 0, sizeof(Pico_mcd->word_ram2M)); |
37 | memset(Pico_mcd->pcm_ram, 0, sizeof(Pico_mcd->pcm_ram)); |
38 | memset(Pico_mcd->bram, 0, sizeof(Pico_mcd->bram)); |
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 | memset(&Pico_mcd->m, 0, sizeof(Pico_mcd->m)); |
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44 | |
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45 | *(unsigned int *)(Pico_mcd->bios + 0x70) = 0xffffffff; // reset hint vector (simplest way to implement reg6) |
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46 | Pico_mcd->m.state_flags |= 2; // s68k reset pending |
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47 | Pico_mcd->s68k_regs[3] = 1; // 2M word RAM mode with m68k access after reset |
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48 | |
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49 | Reset_CD(); |
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50 | LC89510_Reset(); |
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51 | gfx_cd_reset(); |
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52 | #ifdef _ASM_CD_MEMORY_C |
53 | PicoMemResetCD(1); |
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54 | //PicoMemResetCDdecode(1); // don't have to call this in 2M mode |
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55 | #endif |
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56 | |
57 | return 0; |
58 | } |
59 | |
60 | static __inline void SekRun(int cyc) |
61 | { |
62 | int cyc_do; |
63 | SekCycleAim+=cyc; |
64 | if((cyc_do=SekCycleAim-SekCycleCnt) < 0) return; |
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65 | #if defined(EMU_C68K) |
66 | PicoCpu.cycles=cyc_do; |
67 | CycloneRun(&PicoCpu); |
68 | SekCycleCnt+=cyc_do-PicoCpu.cycles; |
69 | #elif defined(EMU_M68K) |
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70 | m68k_set_context(&PicoM68kCPU); |
71 | SekCycleCnt+=m68k_execute(cyc_do); |
72 | #endif |
73 | } |
74 | |
75 | static __inline void SekRunS68k(int cyc) |
76 | { |
77 | int cyc_do; |
78 | SekCycleAimS68k+=cyc; |
79 | if((cyc_do=SekCycleAimS68k-SekCycleCntS68k) < 0) return; |
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80 | #if defined(EMU_C68K) |
81 | PicoCpuS68k.cycles=cyc_do; |
82 | CycloneRun(&PicoCpuS68k); |
83 | SekCycleCntS68k+=cyc_do-PicoCpuS68k.cycles; |
84 | #elif defined(EMU_M68K) |
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85 | m68k_set_context(&PicoS68kCPU); |
86 | SekCycleCntS68k+=m68k_execute(cyc_do); |
87 | #endif |
88 | } |
89 | |
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90 | #define PS_STEP_M68K ((488<<16)/20) // ~24 |
91 | //#define PS_STEP_S68K 13 |
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92 | |
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93 | #ifdef _ASM_CD_PICO_C |
94 | void SekRunPS(int cyc_m68k, int cyc_s68k); |
95 | #else |
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96 | static __inline void SekRunPS(int cyc_m68k, int cyc_s68k) |
97 | { |
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98 | int cycn, cycn_s68k, cyc_do; |
99 | int d_cm = 0, d_cs = 0, ex; |
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100 | SekCycleAim+=cyc_m68k; |
101 | SekCycleAimS68k+=cyc_s68k; |
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102 | |
103 | // fprintf(stderr, "=== start %3i/%3i [%3i/%3i] {%05i.%i} ===\n", cyc_m68k, cyc_s68k, |
104 | // SekCycleAim-SekCycleCnt, SekCycleAimS68k-SekCycleCntS68k, Pico.m.frame_count, Pico.m.scanline); |
105 | |
106 | /* loop 488 downto 0 in steps of PS_STEP */ |
107 | for (cycn = (488<<16)-PS_STEP_M68K; cycn >= 0; cycn -= PS_STEP_M68K) |
108 | { |
109 | ex = 0; |
110 | cycn_s68k = (cycn + cycn/2 + cycn/8) >> 16; |
111 | //fprintf(stderr, "%3i/%3i: ", cycn>>16, cycn_s68k); |
112 | if ((cyc_do = SekCycleAim-SekCycleCnt-(cycn>>16)) > 0) { |
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113 | #if defined(EMU_C68K) |
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114 | PicoCpu.cycles = cyc_do; |
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115 | CycloneRun(&PicoCpu); |
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116 | SekCycleCnt += cyc_do - PicoCpu.cycles; |
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117 | #elif defined(EMU_M68K) |
118 | m68k_set_context(&PicoM68kCPU); |
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119 | SekCycleCnt += (ex = m68k_execute(cyc_do)); |
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120 | #endif |
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121 | } |
122 | //fprintf(stderr, "%3i ", ex); d_cm += ex; ex = 0; |
123 | if ((cyc_do = SekCycleAimS68k-SekCycleCntS68k-cycn_s68k) > 0) { |
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124 | #if defined(EMU_C68K) |
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125 | PicoCpuS68k.cycles = cyc_do; |
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126 | CycloneRun(&PicoCpuS68k); |
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127 | SekCycleCntS68k += cyc_do - PicoCpuS68k.cycles; |
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128 | #elif defined(EMU_M68K) |
129 | m68k_set_context(&PicoS68kCPU); |
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130 | SekCycleCntS68k += (ex = m68k_execute(cyc_do)); |
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131 | #endif |
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132 | } |
133 | //fprintf(stderr, "%3i\n", ex); d_cs += ex; |
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134 | } |
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135 | |
136 | //fprintf(stderr, "== end %3i/%3i ==\n", d_cm, d_cs); |
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137 | } |
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138 | #endif |
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139 | |
140 | |
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141 | static __inline void check_cd_dma(void) |
142 | { |
143 | int ddx; |
144 | |
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145 | if (!(Pico_mcd->scd.Status_CDC & 0x08)) return; |
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146 | |
147 | ddx = Pico_mcd->s68k_regs[4] & 7; |
148 | if (ddx < 2) return; // invalid |
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149 | if (ddx < 4) { |
150 | Pico_mcd->s68k_regs[4] |= 0x40; // Data set ready in host port |
151 | return; |
152 | } |
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153 | if (ddx == 6) return; // invalid |
154 | |
155 | Update_CDC_TRansfer(ddx); // now go and do the actual transfer |
156 | } |
157 | |
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158 | static __inline void update_chips(void) |
159 | { |
160 | int counter_timer, int3_set; |
161 | int counter75hz_lim = Pico.m.pal ? 2080 : 2096; |
162 | |
163 | // 75Hz CDC update |
164 | if ((Pico_mcd->m.counter75hz+=10) >= counter75hz_lim) { |
165 | Pico_mcd->m.counter75hz -= counter75hz_lim; |
166 | Check_CD_Command(); |
167 | } |
168 | |
169 | // update timers |
170 | counter_timer = Pico.m.pal ? 0x21630 : 0x2121c; // 136752 : 135708; |
171 | Pico_mcd->m.timer_stopwatch += counter_timer; |
172 | if ((int3_set = Pico_mcd->s68k_regs[0x31])) { |
173 | Pico_mcd->m.timer_int3 -= counter_timer; |
174 | if (Pico_mcd->m.timer_int3 < 0) { |
175 | if (Pico_mcd->s68k_regs[0x33] & (1<<3)) { |
176 | dprintf("s68k: timer irq 3"); |
177 | SekInterruptS68k(3); |
178 | Pico_mcd->m.timer_int3 += int3_set << 16; |
179 | } |
180 | // is this really what happens if irq3 is masked out? |
181 | Pico_mcd->m.timer_int3 &= 0xffffff; |
182 | } |
183 | } |
184 | |
185 | // update gfx chip |
186 | if (Pico_mcd->rot_comp.Reg_58 & 0x8000) |
187 | gfx_cd_update(); |
188 | } |
189 | |
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190 | |
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191 | static int PicoFrameHintsMCD(void) |
192 | { |
193 | struct PicoVideo *pv=&Pico.video; |
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194 | int total_z80=0,lines,y,lines_vis = 224,z80CycleAim = 0,line_sample; |
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195 | const int cycles_68k=488,cycles_z80=228,cycles_s68k=795; // both PAL and NTSC compile to same values |
196 | int skip=PicoSkipFrame || (PicoOpt&0x10); |
197 | int hint; // Hint counter |
198 | |
199 | if(Pico.m.pal) { // |
200 | //cycles_68k = (int) ((double) OSC_PAL / 7 / 50 / 312 + 0.4); // should compile to a constant (488) |
201 | //cycles_z80 = (int) ((double) OSC_PAL / 15 / 50 / 312 + 0.4); // 228 |
202 | lines = 312; // Steve Snake says there are 313 lines, but this seems to also work well |
203 | line_sample = 68; |
204 | if(pv->reg[1]&8) lines_vis = 240; |
205 | } else { |
206 | //cycles_68k = (int) ((double) OSC_NTSC / 7 / 60 / 262 + 0.4); // 488 |
207 | //cycles_z80 = (int) ((double) OSC_NTSC / 15 / 60 / 262 + 0.4); // 228 |
208 | lines = 262; |
209 | line_sample = 93; |
210 | } |
211 | |
212 | SekCyclesReset(); |
213 | SekCyclesResetS68k(); |
214 | //z80ExtraCycles = 0; |
215 | |
216 | if(PicoOpt&4) |
217 | z80CycleAim = 0; |
218 | // z80_resetCycles(); |
219 | |
220 | pv->status&=~0x88; // clear V-Int, come out of vblank |
221 | |
222 | hint=pv->reg[10]; // Load H-Int counter |
223 | //dprintf("-hint: %i", hint); |
224 | |
225 | for (y=0;y<lines;y++) |
226 | { |
227 | Pico.m.scanline=(short)y; |
228 | |
229 | // pad delay (for 6 button pads) |
230 | if(PicoOpt&0x20) { |
231 | if(Pico.m.padDelay[0]++ > 25) Pico.m.padTHPhase[0]=0; |
232 | if(Pico.m.padDelay[1]++ > 25) Pico.m.padTHPhase[1]=0; |
233 | } |
234 | |
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235 | check_cd_dma(); |
236 | |
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237 | // H-Interrupts: |
238 | if(y <= lines_vis && --hint < 0) // y <= lines_vis: Comix Zone, Golden Axe |
239 | { |
240 | //dprintf("rhint:old @ %06x", SekPc); |
241 | hint=pv->reg[10]; // Reload H-Int counter |
242 | pv->pending_ints|=0x10; |
243 | if (pv->reg[0]&0x10) SekInterrupt(4); |
244 | //dprintf("rhint: %i @ %06x [%i|%i]", hint, SekPc, y, SekCycleCnt); |
245 | //dprintf("hint_routine: %x", (*(unsigned short*)(Pico.ram+0x0B84)<<16)|*(unsigned short*)(Pico.ram+0x0B86)); |
246 | } |
247 | |
248 | // V-Interrupt: |
249 | if (y == lines_vis) |
250 | { |
251 | //dprintf("vint: @ %06x [%i|%i]", SekPc, y, SekCycleCnt); |
252 | pv->status|=0x88; // V-Int happened, go into vblank |
253 | 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) |
254 | /*if(Pico.m.z80Run && (PicoOpt&4)) { |
255 | z80CycleAim+=cycles_z80/2; |
256 | total_z80+=z80_run(z80CycleAim-total_z80); |
257 | z80CycleAim-=cycles_z80/2; |
258 | }*/ |
259 | pv->pending_ints|=0x20; |
260 | if(pv->reg[1]&0x20) SekInterrupt(6); |
261 | if(Pico.m.z80Run && (PicoOpt&4)) // ? |
262 | z80_int(); |
263 | //dprintf("zint: [%i|%i] zPC=%04x", Pico.m.scanline, SekCyclesDone(), mz80GetRegisterValue(NULL, 0)); |
264 | } |
265 | |
266 | // decide if we draw this line |
267 | #if CAN_HANDLE_240_LINES |
268 | if(!skip && ((!(pv->reg[1]&8) && y<224) || ((pv->reg[1]&8) && y<240)) ) |
269 | #else |
270 | if(!skip && y<224) |
271 | #endif |
272 | PicoLine(y); |
273 | |
274 | if(PicoOpt&1) |
275 | sound_timers_and_dac(y); |
276 | |
277 | // get samples from sound chips |
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278 | if (y == 224 && PsndOut) { |
279 | int len = sound_render(0, PsndLen); |
280 | if (PicoWriteSound) PicoWriteSound(len); |
281 | // clear sound buffer |
282 | sound_clear(); |
283 | } |
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284 | |
285 | // Run scanline: |
286 | //dprintf("m68k starting exec @ %06x", SekPc); |
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287 | if(Pico.m.dma_bytes) SekCycleCnt+=CheckDMA(); |
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288 | if((PicoOpt & 0x2000) && (Pico_mcd->m.busreq&3) == 1) { |
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289 | SekRunPS(cycles_68k, cycles_s68k); // "better/perfect sync" |
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290 | } else { |
291 | SekRun(cycles_68k); |
292 | if ((Pico_mcd->m.busreq&3) == 1) // no busreq/no reset |
293 | SekRunS68k(cycles_s68k); |
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294 | } |
295 | |
296 | if((PicoOpt&4) && Pico.m.z80Run) { |
297 | Pico.m.z80Run|=2; |
298 | z80CycleAim+=cycles_z80; |
299 | total_z80+=z80_run(z80CycleAim-total_z80); |
300 | } |
301 | |
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302 | update_chips(); |
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303 | } |
304 | |
305 | // draw a frame just after vblank in alternative render mode |
306 | if(!PicoSkipFrame && (PicoOpt&0x10)) |
307 | PicoFrameFull(); |
308 | |
309 | return 0; |
310 | } |
311 | |
312 | |
313 | int PicoFrameMCD(void) |
314 | { |
315 | if(!(PicoOpt&0x10)) |
316 | PicoFrameStart(); |
317 | |
318 | PicoFrameHintsMCD(); |
319 | |
320 | return 0; |
321 | } |
322 | |
323 | |