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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 int Status_CDC; |
68 | |
69 | static __inline void check_cd_dma(void) |
70 | { |
71 | int ddx; |
72 | |
73 | if (!(Status_CDC & 0x08)) return; |
74 | |
75 | ddx = Pico_mcd->s68k_regs[4] & 7; |
76 | if (ddx < 2) return; // invalid |
77 | if (ddx < 4) Pico_mcd->s68k_regs[4] |= 0x40; // Data set ready in host port |
78 | if (ddx == 6) return; // invalid |
79 | |
80 | Update_CDC_TRansfer(ddx); // now go and do the actual transfer |
81 | } |
82 | |
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83 | |
84 | // Accurate but slower frame which does hints |
85 | static int PicoFrameHintsMCD(void) |
86 | { |
87 | struct PicoVideo *pv=&Pico.video; |
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88 | int total_z80=0,lines,y,lines_vis = 224,z80CycleAim = 0,line_sample,counter75hz_lim; |
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89 | const int cycles_68k=488,cycles_z80=228,cycles_s68k=795; // both PAL and NTSC compile to same values |
90 | int skip=PicoSkipFrame || (PicoOpt&0x10); |
91 | int hint; // Hint counter |
92 | |
93 | if(Pico.m.pal) { // |
94 | //cycles_68k = (int) ((double) OSC_PAL / 7 / 50 / 312 + 0.4); // should compile to a constant (488) |
95 | //cycles_z80 = (int) ((double) OSC_PAL / 15 / 50 / 312 + 0.4); // 228 |
96 | lines = 312; // Steve Snake says there are 313 lines, but this seems to also work well |
97 | line_sample = 68; |
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98 | counter75hz_lim = 2080; |
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99 | if(pv->reg[1]&8) lines_vis = 240; |
100 | } else { |
101 | //cycles_68k = (int) ((double) OSC_NTSC / 7 / 60 / 262 + 0.4); // 488 |
102 | //cycles_z80 = (int) ((double) OSC_NTSC / 15 / 60 / 262 + 0.4); // 228 |
103 | lines = 262; |
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104 | counter75hz_lim = 2096; |
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105 | line_sample = 93; |
106 | } |
107 | |
108 | SekCyclesReset(); |
109 | SekCyclesResetS68k(); |
110 | //z80ExtraCycles = 0; |
111 | |
112 | if(PicoOpt&4) |
113 | z80CycleAim = 0; |
114 | // z80_resetCycles(); |
115 | |
116 | pv->status&=~0x88; // clear V-Int, come out of vblank |
117 | |
118 | hint=pv->reg[10]; // Load H-Int counter |
119 | //dprintf("-hint: %i", hint); |
120 | |
121 | for (y=0;y<lines;y++) |
122 | { |
123 | Pico.m.scanline=(short)y; |
124 | |
125 | // pad delay (for 6 button pads) |
126 | if(PicoOpt&0x20) { |
127 | if(Pico.m.padDelay[0]++ > 25) Pico.m.padTHPhase[0]=0; |
128 | if(Pico.m.padDelay[1]++ > 25) Pico.m.padTHPhase[1]=0; |
129 | } |
130 | |
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131 | check_cd_dma(); |
132 | |
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133 | // H-Interrupts: |
134 | if(y <= lines_vis && --hint < 0) // y <= lines_vis: Comix Zone, Golden Axe |
135 | { |
136 | //dprintf("rhint:old @ %06x", SekPc); |
137 | hint=pv->reg[10]; // Reload H-Int counter |
138 | pv->pending_ints|=0x10; |
139 | if (pv->reg[0]&0x10) SekInterrupt(4); |
140 | //dprintf("rhint: %i @ %06x [%i|%i]", hint, SekPc, y, SekCycleCnt); |
141 | //dprintf("hint_routine: %x", (*(unsigned short*)(Pico.ram+0x0B84)<<16)|*(unsigned short*)(Pico.ram+0x0B86)); |
142 | } |
143 | |
144 | // V-Interrupt: |
145 | if (y == lines_vis) |
146 | { |
147 | //dprintf("vint: @ %06x [%i|%i]", SekPc, y, SekCycleCnt); |
148 | pv->status|=0x88; // V-Int happened, go into vblank |
149 | 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) |
150 | /*if(Pico.m.z80Run && (PicoOpt&4)) { |
151 | z80CycleAim+=cycles_z80/2; |
152 | total_z80+=z80_run(z80CycleAim-total_z80); |
153 | z80CycleAim-=cycles_z80/2; |
154 | }*/ |
155 | pv->pending_ints|=0x20; |
156 | if(pv->reg[1]&0x20) SekInterrupt(6); |
157 | if(Pico.m.z80Run && (PicoOpt&4)) // ? |
158 | z80_int(); |
159 | //dprintf("zint: [%i|%i] zPC=%04x", Pico.m.scanline, SekCyclesDone(), mz80GetRegisterValue(NULL, 0)); |
160 | } |
161 | |
162 | // decide if we draw this line |
163 | #if CAN_HANDLE_240_LINES |
164 | if(!skip && ((!(pv->reg[1]&8) && y<224) || ((pv->reg[1]&8) && y<240)) ) |
165 | #else |
166 | if(!skip && y<224) |
167 | #endif |
168 | PicoLine(y); |
169 | |
170 | if(PicoOpt&1) |
171 | sound_timers_and_dac(y); |
172 | |
173 | // get samples from sound chips |
174 | if(y == 32 && PsndOut) |
175 | emustatus &= ~1; |
176 | else if((y == 224 || y == line_sample) && PsndOut) |
177 | ;//getSamples(y); |
178 | |
179 | // Run scanline: |
180 | //dprintf("m68k starting exec @ %06x", SekPc); |
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181 | if(Pico.m.dma_bytes) SekCycleCnt+=CheckDMA(); |
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182 | SekRun(cycles_68k); |
183 | if ((Pico_mcd->m68k_regs[1]&3) == 1) { // no busreq/no reset |
184 | #if 0 |
185 | int i; |
186 | FILE *f = fopen("prg_ram.bin", "wb"); |
187 | for (i = 0; i < 0x80000; i+=2) |
188 | { |
189 | int tmp = Pico_mcd->prg_ram[i]; |
190 | Pico_mcd->prg_ram[i] = Pico_mcd->prg_ram[i+1]; |
191 | Pico_mcd->prg_ram[i+1] = tmp; |
192 | } |
193 | fwrite(Pico_mcd->prg_ram, 1, 0x80000, f); |
194 | fclose(f); |
195 | exit(1); |
196 | #endif |
197 | //dprintf("s68k starting exec @ %06x", SekPcS68k); |
198 | SekRunS68k(cycles_s68k); |
199 | } |
200 | |
201 | if((PicoOpt&4) && Pico.m.z80Run) { |
202 | Pico.m.z80Run|=2; |
203 | z80CycleAim+=cycles_z80; |
204 | total_z80+=z80_run(z80CycleAim-total_z80); |
205 | } |
206 | |
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207 | if ((counter75hz+=10) >= counter75hz_lim) { |
208 | counter75hz -= counter75hz_lim; |
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209 | Check_CD_Command(); |
210 | } |
211 | } |
212 | |
213 | // draw a frame just after vblank in alternative render mode |
214 | if(!PicoSkipFrame && (PicoOpt&0x10)) |
215 | PicoFrameFull(); |
216 | |
217 | return 0; |
218 | } |
219 | |
220 | |
221 | int PicoFrameMCD(void) |
222 | { |
223 | if(!(PicoOpt&0x10)) |
224 | PicoFrameStart(); |
225 | |
226 | PicoFrameHintsMCD(); |
227 | |
228 | return 0; |
229 | } |
230 | |
231 | |