8b99ab90 |
1 | // common code for Pico.c and cd/Pico.c |
fad24893 |
2 | // (c) Copyright 2007,2008 Grazvydas "notaz" Ignotas |
8b99ab90 |
3 | |
69996cb7 |
4 | #define CYCLES_M68K_LINE 488 // suitable for both PAL/NTSC |
5 | #define CYCLES_M68K_VINT_LAG 68 |
6 | #define CYCLES_M68K_ASD 148 |
bf5fbbb4 |
7 | #define CYCLES_S68K_LINE 795 |
8 | #define CYCLES_S68K_ASD 241 |
69996cb7 |
9 | |
10 | // pad delay (for 6 button pads) |
11 | #define PAD_DELAY \ |
602133e1 |
12 | if (PicoOpt&POPT_6BTN_PAD) { \ |
69996cb7 |
13 | if(Pico.m.padDelay[0]++ > 25) Pico.m.padTHPhase[0]=0; \ |
14 | if(Pico.m.padDelay[1]++ > 25) Pico.m.padTHPhase[1]=0; \ |
15 | } |
16 | |
bf5fbbb4 |
17 | // CPUS_RUN |
18 | #ifndef PICO_CD |
538a6098 |
19 | #define CPUS_RUN(m68k_cycles,s68k_cycles) \ |
4b9c5888 |
20 | SekRunM68k(m68k_cycles); |
bf5fbbb4 |
21 | #else |
538a6098 |
22 | #define CPUS_RUN(m68k_cycles,s68k_cycles) \ |
bf5fbbb4 |
23 | { \ |
602133e1 |
24 | if ((PicoOpt&POPT_EN_MCD_PSYNC) && (Pico_mcd->m.busreq&3) == 1) { \ |
bf5fbbb4 |
25 | SekRunPS(m68k_cycles, s68k_cycles); /* "better/perfect sync" */ \ |
26 | } else { \ |
27 | SekRunM68k(m68k_cycles); \ |
28 | if ((Pico_mcd->m.busreq&3) == 1) /* no busreq/no reset */ \ |
29 | SekRunS68k(s68k_cycles); \ |
30 | } \ |
bf5fbbb4 |
31 | } |
32 | #endif |
33 | |
69996cb7 |
34 | // Accurate but slower frame which does hints |
35 | static int PicoFrameHints(void) |
36 | { |
37 | struct PicoVideo *pv=&Pico.video; |
9761a7d0 |
38 | int lines, y, lines_vis = 224, line_sample, skip, vcnt_wrap; |
69996cb7 |
39 | int hint; // Hint counter |
40 | |
9761a7d0 |
41 | pv->v_counter = Pico.m.scanline = 0; |
538a6098 |
42 | |
602133e1 |
43 | if ((PicoOpt&POPT_ALT_RENDERER) && !PicoSkipFrame && (pv->reg[1]&0x40)) { // fast rend., display enabled |
03e4f2a3 |
44 | // draw a frame just after vblank in alternative render mode |
45 | // yes, this will cause 1 frame lag, but this is inaccurate mode anyway. |
46 | PicoFrameFull(); |
47 | #ifdef DRAW_FINISH_FUNC |
48 | DRAW_FINISH_FUNC(); |
49 | #endif |
50 | skip = 1; |
51 | } |
52 | else skip=PicoSkipFrame; |
53 | |
69996cb7 |
54 | if (Pico.m.pal) { |
69996cb7 |
55 | line_sample = 68; |
9761a7d0 |
56 | if (pv->reg[1]&8) lines_vis = 240; |
69996cb7 |
57 | } else { |
69996cb7 |
58 | line_sample = 93; |
59 | } |
60 | |
61 | SekCyclesReset(); |
4b9c5888 |
62 | z80_resetCycles(); |
bf5fbbb4 |
63 | #ifdef PICO_CD |
64 | SekCyclesResetS68k(); |
65 | #endif |
4b9c5888 |
66 | PsndDacLine = 0; |
7b3f44c6 |
67 | emustatus &= ~1; |
69996cb7 |
68 | |
69 | pv->status&=~0x88; // clear V-Int, come out of vblank |
70 | |
71 | hint=pv->reg[10]; // Load H-Int counter |
72 | //dprintf("-hint: %i", hint); |
73 | |
74 | // This is to make active scan longer (needed for Double Dragon 2, mainly) |
538a6098 |
75 | CPUS_RUN(CYCLES_M68K_ASD, CYCLES_S68K_ASD); |
69996cb7 |
76 | |
b6d7ac70 |
77 | for (y = 0; y < lines_vis; y++) |
69996cb7 |
78 | { |
9761a7d0 |
79 | pv->v_counter = Pico.m.scanline = y; |
80 | if ((pv->reg[12]&6) == 6) { // interlace mode 2 |
81 | pv->v_counter <<= 1; |
82 | pv->v_counter |= pv->v_counter >> 8; |
83 | pv->v_counter &= 0xff; |
84 | } |
69996cb7 |
85 | |
86 | // VDP FIFO |
87 | pv->lwrite_cnt -= 12; |
88 | if (pv->lwrite_cnt <= 0) { |
89 | pv->lwrite_cnt=0; |
90 | Pico.video.status|=0x200; |
91 | } |
92 | |
93 | PAD_DELAY |
bf5fbbb4 |
94 | #ifdef PICO_CD |
95 | check_cd_dma(); |
96 | #endif |
69996cb7 |
97 | |
98 | // H-Interrupts: |
99 | if (--hint < 0) // y <= lines_vis: Comix Zone, Golden Axe |
100 | { |
101 | hint=pv->reg[10]; // Reload H-Int counter |
102 | pv->pending_ints|=0x10; |
103 | if (pv->reg[0]&0x10) { |
104 | elprintf(EL_INTS, "hint: @ %06x [%i]", SekPc, SekCycleCnt); |
105 | SekInterrupt(4); |
106 | } |
107 | } |
108 | |
109 | // decide if we draw this line |
b6d7ac70 |
110 | if (!skip && (PicoOpt & POPT_ALT_RENDERER)) |
fad24893 |
111 | { |
b6d7ac70 |
112 | // find the right moment for frame renderer, when display is no longer blanked |
113 | if ((pv->reg[1]&0x40) || y > 100) { |
114 | PicoFrameFull(); |
fad24893 |
115 | #ifdef DRAW_FINISH_FUNC |
b6d7ac70 |
116 | DRAW_FINISH_FUNC(); |
fad24893 |
117 | #endif |
b6d7ac70 |
118 | skip = 1; |
fad24893 |
119 | } |
120 | } |
69996cb7 |
121 | |
69996cb7 |
122 | // get samples from sound chips |
7b3f44c6 |
123 | if ((y == 224 || y == line_sample) && PsndOut) |
4b9c5888 |
124 | { |
be297089 |
125 | if (Pico.m.z80Run && !Pico.m.z80_reset && (PicoOpt&POPT_EN_Z80)) |
4b9c5888 |
126 | PicoSyncZ80(SekCycleCnt); |
127 | if (ym2612.dacen && PsndDacLine <= y) |
128 | PsndDoDAC(y); |
7b3f44c6 |
129 | PsndGetSamples(y); |
4b9c5888 |
130 | } |
69996cb7 |
131 | |
132 | // Run scanline: |
133 | if (Pico.m.dma_xfers) SekCyclesBurn(CheckDMA()); |
538a6098 |
134 | CPUS_RUN(CYCLES_M68K_LINE, CYCLES_S68K_LINE); |
bf5fbbb4 |
135 | |
136 | #ifdef PICO_CD |
137 | update_chips(); |
017512f2 |
138 | #else |
b0677887 |
139 | if (PicoLineHook) PicoLineHook(); |
bf5fbbb4 |
140 | #endif |
69996cb7 |
141 | } |
142 | |
03e4f2a3 |
143 | if (!skip) |
b6d7ac70 |
144 | { |
145 | if (DrawScanline < y) |
146 | PicoDrawSync(y - 1, 0); |
147 | #ifdef DRAW_FINISH_FUNC |
03e4f2a3 |
148 | DRAW_FINISH_FUNC(); |
8ab3e3c1 |
149 | #endif |
b6d7ac70 |
150 | } |
8ab3e3c1 |
151 | |
947fb5f9 |
152 | // V-int line (224 or 240) |
153 | Pico.m.scanline = y; |
154 | pv->v_counter = 0xe0; // bad for 240 mode |
155 | if ((pv->reg[12]&6) == 6) pv->v_counter = 0xc1; |
156 | |
69996cb7 |
157 | // VDP FIFO |
158 | pv->lwrite_cnt=0; |
159 | Pico.video.status|=0x200; |
160 | |
5f9a0d16 |
161 | memcpy(PicoPadInt, PicoPad, sizeof(PicoPadInt)); |
69996cb7 |
162 | PAD_DELAY |
bf5fbbb4 |
163 | #ifdef PICO_CD |
164 | check_cd_dma(); |
165 | #endif |
69996cb7 |
166 | |
167 | // Last H-Int: |
168 | if (--hint < 0) |
169 | { |
170 | hint=pv->reg[10]; // Reload H-Int counter |
171 | pv->pending_ints|=0x10; |
172 | //printf("rhint: %i @ %06x [%i|%i]\n", hint, SekPc, y, SekCycleCnt); |
173 | if (pv->reg[0]&0x10) SekInterrupt(4); |
174 | } |
175 | |
69996cb7 |
176 | pv->status|=0x08; // go into vblank |
177 | pv->pending_ints|=0x20; |
178 | |
179 | // the following SekRun is there for several reasons: |
180 | // there must be a delay after vblank bit is set and irq is asserted (Mazin Saga) |
181 | // also delay between F bit (bit 7) is set in SR and IRQ happens (Ex-Mutants) |
182 | // also delay between last H-int and V-int (Golden Axe 3) |
bf5fbbb4 |
183 | SekRunM68k(CYCLES_M68K_VINT_LAG); |
4b9c5888 |
184 | |
69996cb7 |
185 | if (pv->reg[1]&0x20) { |
186 | elprintf(EL_INTS, "vint: @ %06x [%i]", SekPc, SekCycleCnt); |
187 | SekInterrupt(6); |
188 | } |
be297089 |
189 | if (Pico.m.z80Run && !Pico.m.z80_reset && (PicoOpt&POPT_EN_Z80)) { |
4b9c5888 |
190 | PicoSyncZ80(SekCycleCnt); |
583ab72c |
191 | elprintf(EL_INTS, "zint"); |
69996cb7 |
192 | z80_int(); |
583ab72c |
193 | } |
69996cb7 |
194 | |
69996cb7 |
195 | // get samples from sound chips |
7b3f44c6 |
196 | if (y == 224 && PsndOut) |
197 | { |
198 | if (ym2612.dacen && PsndDacLine <= y) |
199 | PsndDoDAC(y); |
200 | PsndGetSamples(y); |
201 | } |
69996cb7 |
202 | |
203 | // Run scanline: |
204 | if (Pico.m.dma_xfers) SekCyclesBurn(CheckDMA()); |
bf5fbbb4 |
205 | CPUS_RUN(CYCLES_M68K_LINE - CYCLES_M68K_VINT_LAG - CYCLES_M68K_ASD, |
538a6098 |
206 | CYCLES_S68K_LINE - CYCLES_S68K_ASD); |
bf5fbbb4 |
207 | |
208 | #ifdef PICO_CD |
017512f2 |
209 | update_chips(); |
210 | #else |
b0677887 |
211 | if (PicoLineHook) PicoLineHook(); |
bf5fbbb4 |
212 | #endif |
69996cb7 |
213 | |
214 | // PAL line count might actually be 313 according to Steve Snake, but that would complicate things. |
215 | lines = Pico.m.pal ? 312 : 262; |
9761a7d0 |
216 | vcnt_wrap = Pico.m.pal ? 0x103 : 0xEB; // based on Gens |
69996cb7 |
217 | |
b6d7ac70 |
218 | for (y++; y < lines; y++) |
69996cb7 |
219 | { |
9761a7d0 |
220 | pv->v_counter = Pico.m.scanline = y; |
221 | if (y >= vcnt_wrap) |
222 | pv->v_counter -= Pico.m.pal ? 56 : 6; |
223 | if ((pv->reg[12]&6) == 6) |
224 | pv->v_counter = (pv->v_counter << 1) | 1; |
225 | pv->v_counter &= 0xff; |
69996cb7 |
226 | |
227 | PAD_DELAY |
bf5fbbb4 |
228 | #ifdef PICO_CD |
229 | check_cd_dma(); |
230 | #endif |
69996cb7 |
231 | |
69996cb7 |
232 | // Run scanline: |
233 | if (Pico.m.dma_xfers) SekCyclesBurn(CheckDMA()); |
538a6098 |
234 | CPUS_RUN(CYCLES_M68K_LINE, CYCLES_S68K_LINE); |
bf5fbbb4 |
235 | |
236 | #ifdef PICO_CD |
237 | update_chips(); |
017512f2 |
238 | #else |
b0677887 |
239 | if (PicoLineHook) PicoLineHook(); |
bf5fbbb4 |
240 | #endif |
69996cb7 |
241 | } |
242 | |
4b9c5888 |
243 | // sync z80 |
be297089 |
244 | if (Pico.m.z80Run && !Pico.m.z80_reset && (PicoOpt&POPT_EN_Z80)) |
e53704e6 |
245 | PicoSyncZ80(Pico.m.pal ? 151809 : 127671); // cycles adjusted for converter |
4b9c5888 |
246 | if (PsndOut && ym2612.dacen && PsndDacLine <= lines-1) |
247 | PsndDoDAC(lines-1); |
248 | |
e53704e6 |
249 | timers_cycle(); |
250 | |
69996cb7 |
251 | return 0; |
252 | } |
253 | |
254 | #undef PAD_DELAY |
bf5fbbb4 |
255 | #undef CPUS_RUN |
69996cb7 |
256 | |