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