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1 | // common code for Pico.c and cd/Pico.c |
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2 | // (c) Copyright 2007-2009 Grazvydas "notaz" Ignotas |
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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 |
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7 | #define CYCLES_S68K_LINE 795 |
8 | #define CYCLES_S68K_ASD 241 |
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9 | |
10 | // pad delay (for 6 button pads) |
11 | #define PAD_DELAY \ |
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12 | if (PicoOpt&POPT_6BTN_PAD) { \ |
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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 | |
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17 | // CPUS_RUN |
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18 | #ifndef RUN_SH2S |
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19 | #define RUN_SH2S(x) |
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20 | #endif |
21 | |
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22 | #ifndef PICO_CD |
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23 | #define CPUS_RUN(m68k_cycles,s68k_cycles) \ |
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24 | { \ |
25 | SekRunM68k(m68k_cycles); \ |
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26 | RUN_SH2S(m68k_cycles); \ |
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27 | } |
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28 | #else |
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29 | #define CPUS_RUN(m68k_cycles,s68k_cycles) \ |
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30 | { \ |
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31 | if ((PicoOpt&POPT_EN_MCD_PSYNC) && (Pico_mcd->m.busreq&3) == 1) { \ |
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32 | SekRunPS(m68k_cycles, s68k_cycles); /* "better/perfect sync" */ \ |
33 | } else { \ |
34 | SekRunM68k(m68k_cycles); \ |
35 | if ((Pico_mcd->m.busreq&3) == 1) /* no busreq/no reset */ \ |
36 | SekRunS68k(s68k_cycles); \ |
37 | } \ |
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38 | } |
39 | #endif |
40 | |
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41 | static int PicoFrameHints(void) |
42 | { |
43 | struct PicoVideo *pv=&Pico.video; |
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44 | int lines, y, lines_vis = 224, line_sample, skip, vcnt_wrap; |
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45 | int hint; // Hint counter |
46 | |
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47 | pv->v_counter = Pico.m.scanline = 0; |
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48 | |
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49 | if ((PicoOpt&POPT_ALT_RENDERER) && !PicoSkipFrame && (pv->reg[1]&0x40)) { // fast rend., display enabled |
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50 | // draw a frame just after vblank in alternative render mode |
51 | // yes, this will cause 1 frame lag, but this is inaccurate mode anyway. |
52 | PicoFrameFull(); |
53 | #ifdef DRAW_FINISH_FUNC |
54 | DRAW_FINISH_FUNC(); |
55 | #endif |
56 | skip = 1; |
57 | } |
58 | else skip=PicoSkipFrame; |
59 | |
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60 | if (Pico.m.pal) { |
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61 | line_sample = 68; |
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62 | if (pv->reg[1]&8) lines_vis = 240; |
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63 | } else { |
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64 | line_sample = 93; |
65 | } |
66 | |
67 | SekCyclesReset(); |
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68 | z80_resetCycles(); |
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69 | #ifdef PICO_CD |
70 | SekCyclesResetS68k(); |
71 | #endif |
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72 | PsndDacLine = 0; |
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73 | emustatus &= ~1; |
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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_S68K_ASD); |
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82 | |
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83 | for (y = 0; y < lines_vis; y++) |
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84 | { |
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85 | pv->v_counter = Pico.m.scanline = y; |
86 | if ((pv->reg[12]&6) == 6) { // interlace mode 2 |
87 | pv->v_counter <<= 1; |
88 | pv->v_counter |= pv->v_counter >> 8; |
89 | pv->v_counter &= 0xff; |
90 | } |
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91 | |
92 | // VDP FIFO |
93 | pv->lwrite_cnt -= 12; |
94 | if (pv->lwrite_cnt <= 0) { |
95 | pv->lwrite_cnt=0; |
96 | Pico.video.status|=0x200; |
97 | } |
98 | |
99 | PAD_DELAY |
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100 | #ifdef PICO_CD |
101 | check_cd_dma(); |
102 | #endif |
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103 | #ifdef PICO_32X |
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104 | p32x_pwm_irq_check(1); |
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105 | #endif |
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106 | |
107 | // H-Interrupts: |
108 | if (--hint < 0) // y <= lines_vis: Comix Zone, Golden Axe |
109 | { |
110 | hint=pv->reg[10]; // Reload H-Int counter |
111 | pv->pending_ints|=0x10; |
112 | if (pv->reg[0]&0x10) { |
113 | elprintf(EL_INTS, "hint: @ %06x [%i]", SekPc, SekCycleCnt); |
114 | SekInterrupt(4); |
115 | } |
116 | } |
117 | |
118 | // decide if we draw this line |
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119 | if (!skip && (PicoOpt & POPT_ALT_RENDERER)) |
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120 | { |
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121 | // find the right moment for frame renderer, when display is no longer blanked |
122 | if ((pv->reg[1]&0x40) || y > 100) { |
123 | PicoFrameFull(); |
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124 | #ifdef DRAW_FINISH_FUNC |
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125 | DRAW_FINISH_FUNC(); |
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126 | #endif |
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127 | skip = 1; |
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128 | } |
129 | } |
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130 | |
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131 | // get samples from sound chips |
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132 | if ((y == 224 || y == line_sample) && PsndOut) |
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133 | { |
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134 | if (Pico.m.z80Run && !Pico.m.z80_reset && (PicoOpt&POPT_EN_Z80)) |
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135 | PicoSyncZ80(SekCycleCnt); |
136 | if (ym2612.dacen && PsndDacLine <= y) |
137 | PsndDoDAC(y); |
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138 | PsndGetSamples(y); |
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139 | } |
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140 | |
141 | // Run scanline: |
142 | if (Pico.m.dma_xfers) SekCyclesBurn(CheckDMA()); |
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143 | CPUS_RUN(CYCLES_M68K_LINE, CYCLES_S68K_LINE); |
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144 | |
145 | #ifdef PICO_CD |
146 | update_chips(); |
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147 | #else |
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148 | if (PicoLineHook) PicoLineHook(); |
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149 | #endif |
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150 | } |
151 | |
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152 | if (!skip) |
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153 | { |
154 | if (DrawScanline < y) |
155 | PicoDrawSync(y - 1, 0); |
156 | #ifdef DRAW_FINISH_FUNC |
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157 | DRAW_FINISH_FUNC(); |
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158 | #endif |
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159 | } |
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160 | |
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161 | // V-int line (224 or 240) |
162 | Pico.m.scanline = y; |
163 | pv->v_counter = 0xe0; // bad for 240 mode |
164 | if ((pv->reg[12]&6) == 6) pv->v_counter = 0xc1; |
165 | |
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166 | // VDP FIFO |
167 | pv->lwrite_cnt=0; |
168 | Pico.video.status|=0x200; |
169 | |
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170 | memcpy(PicoPadInt, PicoPad, sizeof(PicoPadInt)); |
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171 | PAD_DELAY |
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172 | #ifdef PICO_CD |
173 | check_cd_dma(); |
174 | #endif |
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175 | #ifdef PICO_32X |
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176 | p32x_pwm_irq_check(1); |
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177 | #endif |
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178 | |
179 | // Last H-Int: |
180 | if (--hint < 0) |
181 | { |
182 | hint=pv->reg[10]; // Reload H-Int counter |
183 | pv->pending_ints|=0x10; |
184 | //printf("rhint: %i @ %06x [%i|%i]\n", hint, SekPc, y, SekCycleCnt); |
185 | if (pv->reg[0]&0x10) SekInterrupt(4); |
186 | } |
187 | |
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188 | pv->status|=0x08; // go into vblank |
189 | pv->pending_ints|=0x20; |
190 | |
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191 | #ifdef PICO_32X |
192 | p32x_start_blank(); |
193 | #endif |
194 | |
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195 | // the following SekRun is there for several reasons: |
196 | // there must be a delay after vblank bit is set and irq is asserted (Mazin Saga) |
197 | // also delay between F bit (bit 7) is set in SR and IRQ happens (Ex-Mutants) |
198 | // also delay between last H-int and V-int (Golden Axe 3) |
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199 | SekRunM68k(CYCLES_M68K_VINT_LAG); |
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200 | |
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201 | if (pv->reg[1]&0x20) { |
202 | elprintf(EL_INTS, "vint: @ %06x [%i]", SekPc, SekCycleCnt); |
203 | SekInterrupt(6); |
204 | } |
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205 | if (Pico.m.z80Run && !Pico.m.z80_reset && (PicoOpt&POPT_EN_Z80)) { |
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206 | PicoSyncZ80(SekCycleCnt); |
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207 | elprintf(EL_INTS, "zint"); |
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208 | z80_int(); |
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209 | } |
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210 | |
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211 | // get samples from sound chips |
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212 | if (y == 224 && PsndOut) |
213 | { |
214 | if (ym2612.dacen && PsndDacLine <= y) |
215 | PsndDoDAC(y); |
216 | PsndGetSamples(y); |
217 | } |
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218 | |
219 | // Run scanline: |
220 | if (Pico.m.dma_xfers) SekCyclesBurn(CheckDMA()); |
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221 | CPUS_RUN(CYCLES_M68K_LINE - CYCLES_M68K_VINT_LAG - CYCLES_M68K_ASD, |
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222 | CYCLES_S68K_LINE - CYCLES_S68K_ASD); |
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223 | |
224 | #ifdef PICO_CD |
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225 | update_chips(); |
226 | #else |
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227 | if (PicoLineHook) PicoLineHook(); |
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228 | #endif |
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229 | |
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230 | lines = scanlines_total; |
231 | vcnt_wrap = Pico.m.pal ? 0x103 : 0xEB; // based on Gens, TODO: verify |
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232 | |
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233 | for (y++; y < lines; y++) |
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234 | { |
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235 | pv->v_counter = Pico.m.scanline = y; |
236 | if (y >= vcnt_wrap) |
237 | pv->v_counter -= Pico.m.pal ? 56 : 6; |
238 | if ((pv->reg[12]&6) == 6) |
239 | pv->v_counter = (pv->v_counter << 1) | 1; |
240 | pv->v_counter &= 0xff; |
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241 | |
242 | PAD_DELAY |
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243 | #ifdef PICO_CD |
244 | check_cd_dma(); |
245 | #endif |
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246 | #ifdef PICO_32X |
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247 | p32x_pwm_irq_check(1); |
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248 | #endif |
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249 | |
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250 | // Run scanline: |
251 | if (Pico.m.dma_xfers) SekCyclesBurn(CheckDMA()); |
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252 | CPUS_RUN(CYCLES_M68K_LINE, CYCLES_S68K_LINE); |
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253 | |
254 | #ifdef PICO_CD |
255 | update_chips(); |
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256 | #else |
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257 | if (PicoLineHook) PicoLineHook(); |
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258 | #endif |
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259 | } |
260 | |
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261 | // sync z80 |
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262 | if (Pico.m.z80Run && !Pico.m.z80_reset && (PicoOpt&POPT_EN_Z80)) |
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263 | PicoSyncZ80(Pico.m.pal ? 151809 : 127671); // cycles adjusted for converter |
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264 | if (PsndOut && ym2612.dacen && PsndDacLine <= lines-1) |
265 | PsndDoDAC(lines-1); |
266 | |
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267 | timers_cycle(); |
268 | |
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269 | return 0; |
270 | } |
271 | |
272 | #undef PAD_DELAY |
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273 | #undef CPUS_RUN |
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274 | |