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