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