cff531af |
1 | /* |
2 | * common code for pico.c and cd/pico.c |
3 | * (C) notaz, 2007-2009 |
4 | * |
5 | * This work is licensed under the terms of MAME license. |
6 | * See COPYING file in the top-level directory. |
7 | */ |
8b99ab90 |
8 | |
69996cb7 |
9 | #define CYCLES_M68K_LINE 488 // suitable for both PAL/NTSC |
10 | #define CYCLES_M68K_VINT_LAG 68 |
11 | #define CYCLES_M68K_ASD 148 |
bf5fbbb4 |
12 | #define CYCLES_S68K_LINE 795 |
236990cf |
13 | #define CYCLES_S68K_VINT_LAG 111 |
bf5fbbb4 |
14 | #define CYCLES_S68K_ASD 241 |
69996cb7 |
15 | |
16 | // pad delay (for 6 button pads) |
17 | #define PAD_DELAY \ |
602133e1 |
18 | if (PicoOpt&POPT_6BTN_PAD) { \ |
69996cb7 |
19 | if(Pico.m.padDelay[0]++ > 25) Pico.m.padTHPhase[0]=0; \ |
20 | if(Pico.m.padDelay[1]++ > 25) Pico.m.padTHPhase[1]=0; \ |
21 | } |
22 | |
bf5fbbb4 |
23 | // CPUS_RUN |
c987bb5c |
24 | #ifndef CPUS_RUN |
538a6098 |
25 | #define CPUS_RUN(m68k_cycles,s68k_cycles) \ |
c987bb5c |
26 | SekRunM68k(m68k_cycles) |
bf5fbbb4 |
27 | #endif |
28 | |
69996cb7 |
29 | static int PicoFrameHints(void) |
30 | { |
31 | struct PicoVideo *pv=&Pico.video; |
9761a7d0 |
32 | int lines, y, lines_vis = 224, line_sample, skip, vcnt_wrap; |
69996cb7 |
33 | int hint; // Hint counter |
34 | |
9761a7d0 |
35 | pv->v_counter = Pico.m.scanline = 0; |
538a6098 |
36 | |
602133e1 |
37 | if ((PicoOpt&POPT_ALT_RENDERER) && !PicoSkipFrame && (pv->reg[1]&0x40)) { // fast rend., display enabled |
03e4f2a3 |
38 | // draw a frame just after vblank in alternative render mode |
39 | // yes, this will cause 1 frame lag, but this is inaccurate mode anyway. |
40 | PicoFrameFull(); |
41 | #ifdef DRAW_FINISH_FUNC |
42 | DRAW_FINISH_FUNC(); |
43 | #endif |
44 | skip = 1; |
45 | } |
46 | else skip=PicoSkipFrame; |
47 | |
69996cb7 |
48 | if (Pico.m.pal) { |
69996cb7 |
49 | line_sample = 68; |
9761a7d0 |
50 | if (pv->reg[1]&8) lines_vis = 240; |
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51 | } else { |
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52 | line_sample = 93; |
53 | } |
54 | |
55 | SekCyclesReset(); |
4b9c5888 |
56 | z80_resetCycles(); |
bf5fbbb4 |
57 | #ifdef PICO_CD |
58 | SekCyclesResetS68k(); |
59 | #endif |
4b9c5888 |
60 | PsndDacLine = 0; |
7b3f44c6 |
61 | emustatus &= ~1; |
69996cb7 |
62 | |
63 | pv->status&=~0x88; // clear V-Int, come out of vblank |
64 | |
65 | hint=pv->reg[10]; // Load H-Int counter |
66 | //dprintf("-hint: %i", hint); |
67 | |
68 | // This is to make active scan longer (needed for Double Dragon 2, mainly) |
538a6098 |
69 | CPUS_RUN(CYCLES_M68K_ASD, CYCLES_S68K_ASD); |
69996cb7 |
70 | |
b6d7ac70 |
71 | for (y = 0; y < lines_vis; y++) |
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72 | { |
9761a7d0 |
73 | pv->v_counter = Pico.m.scanline = y; |
74 | if ((pv->reg[12]&6) == 6) { // interlace mode 2 |
75 | pv->v_counter <<= 1; |
76 | pv->v_counter |= pv->v_counter >> 8; |
77 | pv->v_counter &= 0xff; |
78 | } |
69996cb7 |
79 | |
80 | // VDP FIFO |
81 | pv->lwrite_cnt -= 12; |
82 | if (pv->lwrite_cnt <= 0) { |
83 | pv->lwrite_cnt=0; |
84 | Pico.video.status|=0x200; |
85 | } |
86 | |
87 | PAD_DELAY |
bf5fbbb4 |
88 | #ifdef PICO_CD |
89 | check_cd_dma(); |
90 | #endif |
db1d3564 |
91 | #ifdef PICO_32X |
1d7a28a7 |
92 | p32x_timers_do(1); |
db1d3564 |
93 | #endif |
69996cb7 |
94 | |
95 | // H-Interrupts: |
96 | if (--hint < 0) // y <= lines_vis: Comix Zone, Golden Axe |
97 | { |
98 | hint=pv->reg[10]; // Reload H-Int counter |
99 | pv->pending_ints|=0x10; |
100 | if (pv->reg[0]&0x10) { |
101 | elprintf(EL_INTS, "hint: @ %06x [%i]", SekPc, SekCycleCnt); |
102 | SekInterrupt(4); |
103 | } |
104 | } |
105 | |
106 | // decide if we draw this line |
b6d7ac70 |
107 | if (!skip && (PicoOpt & POPT_ALT_RENDERER)) |
fad24893 |
108 | { |
b6d7ac70 |
109 | // find the right moment for frame renderer, when display is no longer blanked |
110 | if ((pv->reg[1]&0x40) || y > 100) { |
111 | PicoFrameFull(); |
fad24893 |
112 | #ifdef DRAW_FINISH_FUNC |
b6d7ac70 |
113 | DRAW_FINISH_FUNC(); |
fad24893 |
114 | #endif |
b6d7ac70 |
115 | skip = 1; |
fad24893 |
116 | } |
117 | } |
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118 | |
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119 | // get samples from sound chips |
7b3f44c6 |
120 | if ((y == 224 || y == line_sample) && PsndOut) |
4b9c5888 |
121 | { |
be297089 |
122 | if (Pico.m.z80Run && !Pico.m.z80_reset && (PicoOpt&POPT_EN_Z80)) |
4b9c5888 |
123 | PicoSyncZ80(SekCycleCnt); |
124 | if (ym2612.dacen && PsndDacLine <= y) |
125 | PsndDoDAC(y); |
7b3f44c6 |
126 | PsndGetSamples(y); |
4b9c5888 |
127 | } |
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128 | |
129 | // Run scanline: |
130 | if (Pico.m.dma_xfers) SekCyclesBurn(CheckDMA()); |
538a6098 |
131 | CPUS_RUN(CYCLES_M68K_LINE, CYCLES_S68K_LINE); |
bf5fbbb4 |
132 | |
133 | #ifdef PICO_CD |
134 | update_chips(); |
017512f2 |
135 | #else |
b0677887 |
136 | if (PicoLineHook) PicoLineHook(); |
bf5fbbb4 |
137 | #endif |
69996cb7 |
138 | } |
139 | |
03e4f2a3 |
140 | if (!skip) |
b6d7ac70 |
141 | { |
142 | if (DrawScanline < y) |
143 | PicoDrawSync(y - 1, 0); |
144 | #ifdef DRAW_FINISH_FUNC |
03e4f2a3 |
145 | DRAW_FINISH_FUNC(); |
8ab3e3c1 |
146 | #endif |
b6d7ac70 |
147 | } |
8ab3e3c1 |
148 | |
947fb5f9 |
149 | // V-int line (224 or 240) |
150 | Pico.m.scanline = y; |
151 | pv->v_counter = 0xe0; // bad for 240 mode |
152 | if ((pv->reg[12]&6) == 6) pv->v_counter = 0xc1; |
153 | |
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154 | // VDP FIFO |
155 | pv->lwrite_cnt=0; |
156 | Pico.video.status|=0x200; |
157 | |
5f9a0d16 |
158 | memcpy(PicoPadInt, PicoPad, sizeof(PicoPadInt)); |
69996cb7 |
159 | PAD_DELAY |
bf5fbbb4 |
160 | #ifdef PICO_CD |
161 | check_cd_dma(); |
162 | #endif |
db1d3564 |
163 | #ifdef PICO_32X |
1d7a28a7 |
164 | p32x_timers_do(1); |
db1d3564 |
165 | #endif |
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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 | |
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176 | pv->status|=0x08; // go into vblank |
177 | pv->pending_ints|=0x20; |
178 | |
974fdb5b |
179 | #ifdef PICO_32X |
180 | p32x_start_blank(); |
181 | #endif |
182 | |
69996cb7 |
183 | // the following SekRun is there for several reasons: |
184 | // there must be a delay after vblank bit is set and irq is asserted (Mazin Saga) |
185 | // also delay between F bit (bit 7) is set in SR and IRQ happens (Ex-Mutants) |
186 | // also delay between last H-int and V-int (Golden Axe 3) |
236990cf |
187 | CPUS_RUN(CYCLES_M68K_VINT_LAG, CYCLES_S68K_VINT_LAG); |
4b9c5888 |
188 | |
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189 | if (pv->reg[1]&0x20) { |
190 | elprintf(EL_INTS, "vint: @ %06x [%i]", SekPc, SekCycleCnt); |
191 | SekInterrupt(6); |
192 | } |
be297089 |
193 | if (Pico.m.z80Run && !Pico.m.z80_reset && (PicoOpt&POPT_EN_Z80)) { |
4b9c5888 |
194 | PicoSyncZ80(SekCycleCnt); |
583ab72c |
195 | elprintf(EL_INTS, "zint"); |
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196 | z80_int(); |
583ab72c |
197 | } |
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198 | |
69996cb7 |
199 | // get samples from sound chips |
7b3f44c6 |
200 | if (y == 224 && PsndOut) |
201 | { |
202 | if (ym2612.dacen && PsndDacLine <= y) |
203 | PsndDoDAC(y); |
204 | PsndGetSamples(y); |
205 | } |
69996cb7 |
206 | |
207 | // Run scanline: |
208 | if (Pico.m.dma_xfers) SekCyclesBurn(CheckDMA()); |
bf5fbbb4 |
209 | CPUS_RUN(CYCLES_M68K_LINE - CYCLES_M68K_VINT_LAG - CYCLES_M68K_ASD, |
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210 | CYCLES_S68K_LINE - CYCLES_S68K_VINT_LAG - CYCLES_S68K_ASD); |
bf5fbbb4 |
211 | |
212 | #ifdef PICO_CD |
017512f2 |
213 | update_chips(); |
214 | #else |
b0677887 |
215 | if (PicoLineHook) PicoLineHook(); |
bf5fbbb4 |
216 | #endif |
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217 | |
5e128c6d |
218 | lines = scanlines_total; |
219 | vcnt_wrap = Pico.m.pal ? 0x103 : 0xEB; // based on Gens, TODO: verify |
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220 | |
b6d7ac70 |
221 | for (y++; y < lines; y++) |
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222 | { |
9761a7d0 |
223 | pv->v_counter = Pico.m.scanline = y; |
224 | if (y >= vcnt_wrap) |
225 | pv->v_counter -= Pico.m.pal ? 56 : 6; |
226 | if ((pv->reg[12]&6) == 6) |
227 | pv->v_counter = (pv->v_counter << 1) | 1; |
228 | pv->v_counter &= 0xff; |
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229 | |
230 | PAD_DELAY |
bf5fbbb4 |
231 | #ifdef PICO_CD |
232 | check_cd_dma(); |
233 | #endif |
db1d3564 |
234 | #ifdef PICO_32X |
1d7a28a7 |
235 | p32x_timers_do(1); |
db1d3564 |
236 | #endif |
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237 | |
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238 | // Run scanline: |
239 | if (Pico.m.dma_xfers) SekCyclesBurn(CheckDMA()); |
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240 | CPUS_RUN(CYCLES_M68K_LINE, CYCLES_S68K_LINE); |
bf5fbbb4 |
241 | |
242 | #ifdef PICO_CD |
243 | update_chips(); |
017512f2 |
244 | #else |
b0677887 |
245 | if (PicoLineHook) PicoLineHook(); |
bf5fbbb4 |
246 | #endif |
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247 | } |
248 | |
4b9c5888 |
249 | // sync z80 |
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250 | if (Pico.m.z80Run && !Pico.m.z80_reset && (PicoOpt&POPT_EN_Z80)) |
e53704e6 |
251 | PicoSyncZ80(Pico.m.pal ? 151809 : 127671); // cycles adjusted for converter |
4b9c5888 |
252 | if (PsndOut && ym2612.dacen && PsndDacLine <= lines-1) |
253 | PsndDoDAC(lines-1); |
254 | |
e53704e6 |
255 | timers_cycle(); |
256 | |
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257 | return 0; |
258 | } |
259 | |
260 | #undef PAD_DELAY |
bf5fbbb4 |
261 | #undef CPUS_RUN |
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262 | |