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1 | // common code for Pico.c and cd/Pico.c |
2 | // (c) Copyright 2007, Grazvydas "notaz" Ignotas |
3 | |
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4 | #define CYCLES_M68K_LINE 488 // suitable for both PAL/NTSC |
5 | #define CYCLES_M68K_VINT_LAG 68 |
6 | #define CYCLES_M68K_ASD 148 |
7 | #define CYCLES_Z80_LINE 228 |
8 | #define CYCLES_Z80_ASD 69 |
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9 | #define CYCLES_S68K_LINE 795 |
10 | #define CYCLES_S68K_ASD 241 |
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11 | |
12 | // pad delay (for 6 button pads) |
13 | #define PAD_DELAY \ |
14 | if (PicoOpt&0x20) { \ |
15 | if(Pico.m.padDelay[0]++ > 25) Pico.m.padTHPhase[0]=0; \ |
16 | if(Pico.m.padDelay[1]++ > 25) Pico.m.padTHPhase[1]=0; \ |
17 | } |
18 | |
19 | #define Z80_RUN(z80_cycles) \ |
20 | { \ |
21 | if ((PicoOpt&4) && Pico.m.z80Run) \ |
22 | { \ |
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23 | int cnt; \ |
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24 | if (Pico.m.z80Run & 2) z80CycleAim += z80_cycles; \ |
25 | else { \ |
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26 | cnt = SekCyclesDone() - z80startCycle; \ |
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27 | cnt = (cnt>>1)-(cnt>>5); \ |
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28 | if (cnt < 0 || cnt > (z80_cycles)) cnt = z80_cycles; \ |
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29 | Pico.m.z80Run |= 2; \ |
30 | z80CycleAim+=cnt; \ |
31 | } \ |
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32 | cnt=z80CycleAim-total_z80; \ |
33 | if (cnt > 0) total_z80+=z80_run(cnt); \ |
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34 | } \ |
35 | } |
36 | |
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37 | // CPUS_RUN |
38 | #ifndef PICO_CD |
39 | #define CPUS_RUN(m68k_cycles,z80_cycles,s68k_cycles) \ |
40 | SekRunM68k(m68k_cycles); \ |
41 | Z80_RUN(z80_cycles); |
42 | #else |
43 | #define CPUS_RUN(m68k_cycles,z80_cycles,s68k_cycles) \ |
44 | { \ |
45 | if ((PicoOpt & 0x2000) && (Pico_mcd->m.busreq&3) == 1) { \ |
46 | SekRunPS(m68k_cycles, s68k_cycles); /* "better/perfect sync" */ \ |
47 | } else { \ |
48 | SekRunM68k(m68k_cycles); \ |
49 | if ((Pico_mcd->m.busreq&3) == 1) /* no busreq/no reset */ \ |
50 | SekRunS68k(s68k_cycles); \ |
51 | } \ |
52 | Z80_RUN(z80_cycles); \ |
53 | } |
54 | #endif |
55 | |
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56 | // Accurate but slower frame which does hints |
57 | static int PicoFrameHints(void) |
58 | { |
59 | struct PicoVideo *pv=&Pico.video; |
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60 | int lines, y, lines_vis = 224, total_z80 = 0, z80CycleAim = 0, line_sample, skip; |
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61 | int hint; // Hint counter |
62 | |
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63 | if ((PicoOpt&0x10) && !PicoSkipFrame) { |
64 | // draw a frame just after vblank in alternative render mode |
65 | // yes, this will cause 1 frame lag, but this is inaccurate mode anyway. |
66 | PicoFrameFull(); |
67 | #ifdef DRAW_FINISH_FUNC |
68 | DRAW_FINISH_FUNC(); |
69 | #endif |
70 | skip = 1; |
71 | } |
72 | else skip=PicoSkipFrame; |
73 | |
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74 | if (Pico.m.pal) { |
75 | //cycles_68k = (int) ((double) OSC_PAL / 7 / 50 / 312 + 0.4); // should compile to a constant (488) |
76 | //cycles_z80 = (int) ((double) OSC_PAL / 15 / 50 / 312 + 0.4); // 228 |
77 | line_sample = 68; |
78 | if(pv->reg[1]&8) lines_vis = 240; |
79 | } else { |
80 | //cycles_68k = (int) ((double) OSC_NTSC / 7 / 60 / 262 + 0.4); // 488 |
81 | //cycles_z80 = (int) ((double) OSC_NTSC / 15 / 60 / 262 + 0.4); // 228 |
82 | line_sample = 93; |
83 | } |
84 | |
85 | SekCyclesReset(); |
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86 | #ifdef PICO_CD |
87 | SekCyclesResetS68k(); |
88 | #endif |
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89 | |
90 | pv->status&=~0x88; // clear V-Int, come out of vblank |
91 | |
92 | hint=pv->reg[10]; // Load H-Int counter |
93 | //dprintf("-hint: %i", hint); |
94 | |
95 | // This is to make active scan longer (needed for Double Dragon 2, mainly) |
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96 | // also trying to adjust for z80 overclock here (due to int line cycle counts) |
97 | z80CycleAim = Pico.m.pal ? -40 : 7; |
98 | CPUS_RUN(CYCLES_M68K_ASD, 0, CYCLES_S68K_ASD); |
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99 | |
100 | for (y=0;y<lines_vis;y++) |
101 | { |
102 | Pico.m.scanline=(short)y; |
103 | |
104 | // VDP FIFO |
105 | pv->lwrite_cnt -= 12; |
106 | if (pv->lwrite_cnt <= 0) { |
107 | pv->lwrite_cnt=0; |
108 | Pico.video.status|=0x200; |
109 | } |
110 | |
111 | PAD_DELAY |
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112 | #ifdef PICO_CD |
113 | check_cd_dma(); |
114 | #endif |
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115 | |
116 | // H-Interrupts: |
117 | if (--hint < 0) // y <= lines_vis: Comix Zone, Golden Axe |
118 | { |
119 | hint=pv->reg[10]; // Reload H-Int counter |
120 | pv->pending_ints|=0x10; |
121 | if (pv->reg[0]&0x10) { |
122 | elprintf(EL_INTS, "hint: @ %06x [%i]", SekPc, SekCycleCnt); |
123 | SekInterrupt(4); |
124 | } |
125 | } |
126 | |
127 | // decide if we draw this line |
128 | #if CAN_HANDLE_240_LINES |
129 | if(!skip && ((!(pv->reg[1]&8) && y<224) || (pv->reg[1]&8)) ) |
130 | #else |
131 | if(!skip && y<224) |
132 | #endif |
133 | PicoLine(y); |
134 | |
135 | if(PicoOpt&1) |
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136 | Psnd_timers_and_dac(y); |
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137 | |
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138 | #ifndef PICO_CD |
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139 | // get samples from sound chips |
140 | if(y == 32 && PsndOut) |
141 | emustatus &= ~1; |
142 | else if((y == 224 || y == line_sample) && PsndOut) |
143 | getSamples(y); |
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144 | #endif |
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145 | |
146 | // Run scanline: |
147 | if (Pico.m.dma_xfers) SekCyclesBurn(CheckDMA()); |
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148 | CPUS_RUN(CYCLES_M68K_LINE, CYCLES_Z80_LINE, CYCLES_S68K_LINE); |
149 | |
150 | #ifdef PICO_CD |
151 | update_chips(); |
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152 | #else |
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153 | if (PicoLineHook) PicoLineHook(1); |
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154 | #endif |
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155 | } |
156 | |
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157 | #ifdef DRAW_FINISH_FUNC |
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158 | if (!skip) |
159 | DRAW_FINISH_FUNC(); |
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160 | #endif |
161 | |
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162 | // V-int line (224 or 240) |
163 | Pico.m.scanline=(short)y; |
164 | |
165 | // VDP FIFO |
166 | pv->lwrite_cnt=0; |
167 | Pico.video.status|=0x200; |
168 | |
169 | PAD_DELAY |
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170 | #ifdef PICO_CD |
171 | check_cd_dma(); |
172 | #endif |
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173 | |
174 | // Last H-Int: |
175 | if (--hint < 0) |
176 | { |
177 | hint=pv->reg[10]; // Reload H-Int counter |
178 | pv->pending_ints|=0x10; |
179 | //printf("rhint: %i @ %06x [%i|%i]\n", hint, SekPc, y, SekCycleCnt); |
180 | if (pv->reg[0]&0x10) SekInterrupt(4); |
181 | } |
182 | |
183 | // V-Interrupt: |
184 | pv->status|=0x08; // go into vblank |
185 | pv->pending_ints|=0x20; |
186 | |
187 | // the following SekRun is there for several reasons: |
188 | // there must be a delay after vblank bit is set and irq is asserted (Mazin Saga) |
189 | // also delay between F bit (bit 7) is set in SR and IRQ happens (Ex-Mutants) |
190 | // also delay between last H-int and V-int (Golden Axe 3) |
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191 | SekRunM68k(CYCLES_M68K_VINT_LAG); |
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192 | if (pv->reg[1]&0x20) { |
193 | elprintf(EL_INTS, "vint: @ %06x [%i]", SekPc, SekCycleCnt); |
194 | SekInterrupt(6); |
195 | } |
196 | if (Pico.m.z80Run && (PicoOpt&4)) |
197 | z80_int(); |
198 | |
199 | if (PicoOpt&1) |
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200 | Psnd_timers_and_dac(y); |
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201 | |
202 | // get samples from sound chips |
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203 | #ifndef PICO_CD |
204 | if (y == 224) |
205 | #endif |
206 | if (PsndOut) |
207 | getSamples(y); |
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208 | |
209 | // Run scanline: |
210 | if (Pico.m.dma_xfers) SekCyclesBurn(CheckDMA()); |
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211 | CPUS_RUN(CYCLES_M68K_LINE - CYCLES_M68K_VINT_LAG - CYCLES_M68K_ASD, |
212 | CYCLES_Z80_LINE - CYCLES_Z80_ASD, CYCLES_S68K_LINE - CYCLES_S68K_ASD); |
213 | |
214 | #ifdef PICO_CD |
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215 | update_chips(); |
216 | #else |
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217 | if (PicoLineHook) PicoLineHook(1); |
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218 | #endif |
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219 | |
220 | // PAL line count might actually be 313 according to Steve Snake, but that would complicate things. |
221 | lines = Pico.m.pal ? 312 : 262; |
222 | |
223 | for (y++;y<lines;y++) |
224 | { |
225 | Pico.m.scanline=(short)y; |
226 | |
227 | PAD_DELAY |
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228 | #ifdef PICO_CD |
229 | check_cd_dma(); |
230 | #endif |
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231 | |
232 | if(PicoOpt&1) |
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233 | Psnd_timers_and_dac(y); |
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234 | |
235 | // Run scanline: |
236 | if (Pico.m.dma_xfers) SekCyclesBurn(CheckDMA()); |
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237 | CPUS_RUN(CYCLES_M68K_LINE, CYCLES_Z80_LINE, CYCLES_S68K_LINE); |
238 | |
239 | #ifdef PICO_CD |
240 | update_chips(); |
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241 | #else |
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242 | if (PicoLineHook) PicoLineHook(1); |
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243 | #endif |
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244 | } |
245 | |
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246 | return 0; |
247 | } |
248 | |
249 | #undef PAD_DELAY |
250 | #undef Z80_RUN |
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251 | #undef CPUS_RUN |
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252 | |