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