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1 | // common code for Pico.c and cd/Pico.c |
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2 | // (c) Copyright 2007,2008 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 |
18 | #ifndef PICO_CD |
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19 | #define CPUS_RUN(m68k_cycles,s68k_cycles) \ |
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20 | SekRunM68k(m68k_cycles); |
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21 | #else |
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22 | #define CPUS_RUN(m68k_cycles,s68k_cycles) \ |
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23 | { \ |
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24 | if ((PicoOpt&POPT_EN_MCD_PSYNC) && (Pico_mcd->m.busreq&3) == 1) { \ |
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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 | } \ |
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31 | } |
32 | #endif |
33 | |
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34 | static int PicoFrameHints(void) |
35 | { |
36 | struct PicoVideo *pv=&Pico.video; |
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37 | int lines, y, lines_vis = 224, line_sample, skip, vcnt_wrap; |
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38 | int hint; // Hint counter |
39 | |
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40 | pv->v_counter = Pico.m.scanline = 0; |
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41 | |
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42 | if ((PicoOpt&POPT_ALT_RENDERER) && !PicoSkipFrame && (pv->reg[1]&0x40)) { // fast rend., display enabled |
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43 | // draw a frame just after vblank in alternative render mode |
44 | // yes, this will cause 1 frame lag, but this is inaccurate mode anyway. |
45 | PicoFrameFull(); |
46 | #ifdef DRAW_FINISH_FUNC |
47 | DRAW_FINISH_FUNC(); |
48 | #endif |
49 | skip = 1; |
50 | } |
51 | else skip=PicoSkipFrame; |
52 | |
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53 | if (Pico.m.pal) { |
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54 | line_sample = 68; |
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55 | if (pv->reg[1]&8) lines_vis = 240; |
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56 | } else { |
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57 | line_sample = 93; |
58 | } |
59 | |
60 | SekCyclesReset(); |
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61 | z80_resetCycles(); |
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62 | #ifdef PICO_CD |
63 | SekCyclesResetS68k(); |
64 | #endif |
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65 | PsndDacLine = 0; |
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66 | emustatus &= ~1; |
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67 | |
68 | pv->status&=~0x88; // clear V-Int, come out of vblank |
69 | |
70 | hint=pv->reg[10]; // Load H-Int counter |
71 | //dprintf("-hint: %i", hint); |
72 | |
73 | // This is to make active scan longer (needed for Double Dragon 2, mainly) |
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74 | CPUS_RUN(CYCLES_M68K_ASD, CYCLES_S68K_ASD); |
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75 | |
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76 | for (y = 0; y < lines_vis; y++) |
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77 | { |
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78 | pv->v_counter = Pico.m.scanline = y; |
79 | if ((pv->reg[12]&6) == 6) { // interlace mode 2 |
80 | pv->v_counter <<= 1; |
81 | pv->v_counter |= pv->v_counter >> 8; |
82 | pv->v_counter &= 0xff; |
83 | } |
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84 | |
85 | // VDP FIFO |
86 | pv->lwrite_cnt -= 12; |
87 | if (pv->lwrite_cnt <= 0) { |
88 | pv->lwrite_cnt=0; |
89 | Pico.video.status|=0x200; |
90 | } |
91 | |
92 | PAD_DELAY |
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93 | #ifdef PICO_CD |
94 | check_cd_dma(); |
95 | #endif |
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96 | |
97 | // H-Interrupts: |
98 | if (--hint < 0) // y <= lines_vis: Comix Zone, Golden Axe |
99 | { |
100 | hint=pv->reg[10]; // Reload H-Int counter |
101 | pv->pending_ints|=0x10; |
102 | if (pv->reg[0]&0x10) { |
103 | elprintf(EL_INTS, "hint: @ %06x [%i]", SekPc, SekCycleCnt); |
104 | SekInterrupt(4); |
105 | } |
106 | } |
107 | |
108 | // decide if we draw this line |
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109 | if (!skip && (PicoOpt & POPT_ALT_RENDERER)) |
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110 | { |
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111 | // find the right moment for frame renderer, when display is no longer blanked |
112 | if ((pv->reg[1]&0x40) || y > 100) { |
113 | PicoFrameFull(); |
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114 | #ifdef DRAW_FINISH_FUNC |
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115 | DRAW_FINISH_FUNC(); |
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116 | #endif |
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117 | skip = 1; |
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118 | } |
119 | } |
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120 | |
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121 | // get samples from sound chips |
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122 | if ((y == 224 || y == line_sample) && PsndOut) |
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123 | { |
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124 | if (Pico.m.z80Run && !Pico.m.z80_reset && (PicoOpt&POPT_EN_Z80)) |
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125 | PicoSyncZ80(SekCycleCnt); |
126 | if (ym2612.dacen && PsndDacLine <= y) |
127 | PsndDoDAC(y); |
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128 | PsndGetSamples(y); |
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129 | } |
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130 | |
131 | // Run scanline: |
132 | if (Pico.m.dma_xfers) SekCyclesBurn(CheckDMA()); |
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133 | CPUS_RUN(CYCLES_M68K_LINE, CYCLES_S68K_LINE); |
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134 | |
135 | #ifdef PICO_CD |
136 | update_chips(); |
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137 | #else |
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138 | if (PicoLineHook) PicoLineHook(); |
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139 | #endif |
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140 | } |
141 | |
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142 | if (!skip) |
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143 | { |
144 | if (DrawScanline < y) |
145 | PicoDrawSync(y - 1, 0); |
146 | #ifdef DRAW_FINISH_FUNC |
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147 | DRAW_FINISH_FUNC(); |
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148 | #endif |
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149 | } |
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150 | |
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151 | // V-int line (224 or 240) |
152 | Pico.m.scanline = y; |
153 | pv->v_counter = 0xe0; // bad for 240 mode |
154 | if ((pv->reg[12]&6) == 6) pv->v_counter = 0xc1; |
155 | |
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156 | // VDP FIFO |
157 | pv->lwrite_cnt=0; |
158 | Pico.video.status|=0x200; |
159 | |
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160 | memcpy(PicoPadInt, PicoPad, sizeof(PicoPadInt)); |
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161 | PAD_DELAY |
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162 | #ifdef PICO_CD |
163 | check_cd_dma(); |
164 | #endif |
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165 | |
166 | // Last H-Int: |
167 | if (--hint < 0) |
168 | { |
169 | hint=pv->reg[10]; // Reload H-Int counter |
170 | pv->pending_ints|=0x10; |
171 | //printf("rhint: %i @ %06x [%i|%i]\n", hint, SekPc, y, SekCycleCnt); |
172 | if (pv->reg[0]&0x10) SekInterrupt(4); |
173 | } |
174 | |
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175 | pv->status|=0x08; // go into vblank |
176 | pv->pending_ints|=0x20; |
177 | |
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178 | #ifdef PICO_32X |
179 | p32x_start_blank(); |
180 | #endif |
181 | |
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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 | |
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188 | if (pv->reg[1]&0x20) { |
189 | elprintf(EL_INTS, "vint: @ %06x [%i]", SekPc, SekCycleCnt); |
190 | SekInterrupt(6); |
191 | } |
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192 | if (Pico.m.z80Run && !Pico.m.z80_reset && (PicoOpt&POPT_EN_Z80)) { |
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193 | PicoSyncZ80(SekCycleCnt); |
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194 | elprintf(EL_INTS, "zint"); |
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195 | z80_int(); |
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196 | } |
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197 | |
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198 | // get samples from sound chips |
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199 | if (y == 224 && PsndOut) |
200 | { |
201 | if (ym2612.dacen && PsndDacLine <= y) |
202 | PsndDoDAC(y); |
203 | PsndGetSamples(y); |
204 | } |
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205 | |
206 | // Run scanline: |
207 | if (Pico.m.dma_xfers) SekCyclesBurn(CheckDMA()); |
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208 | CPUS_RUN(CYCLES_M68K_LINE - CYCLES_M68K_VINT_LAG - CYCLES_M68K_ASD, |
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209 | CYCLES_S68K_LINE - CYCLES_S68K_ASD); |
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210 | |
211 | #ifdef PICO_CD |
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212 | update_chips(); |
213 | #else |
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214 | if (PicoLineHook) PicoLineHook(); |
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215 | #endif |
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216 | |
217 | // PAL line count might actually be 313 according to Steve Snake, but that would complicate things. |
218 | lines = Pico.m.pal ? 312 : 262; |
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219 | vcnt_wrap = Pico.m.pal ? 0x103 : 0xEB; // based on Gens |
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220 | |
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221 | for (y++; y < lines; y++) |
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222 | { |
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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 |
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231 | #ifdef PICO_CD |
232 | check_cd_dma(); |
233 | #endif |
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234 | |
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235 | // Run scanline: |
236 | if (Pico.m.dma_xfers) SekCyclesBurn(CheckDMA()); |
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237 | CPUS_RUN(CYCLES_M68K_LINE, CYCLES_S68K_LINE); |
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238 | |
239 | #ifdef PICO_CD |
240 | update_chips(); |
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241 | #else |
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242 | if (PicoLineHook) PicoLineHook(); |
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243 | #endif |
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244 | } |
245 | |
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246 | // sync z80 |
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247 | if (Pico.m.z80Run && !Pico.m.z80_reset && (PicoOpt&POPT_EN_Z80)) |
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248 | PicoSyncZ80(Pico.m.pal ? 151809 : 127671); // cycles adjusted for converter |
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249 | if (PsndOut && ym2612.dacen && PsndDacLine <= lines-1) |
250 | PsndDoDAC(lines-1); |
251 | |
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252 | timers_cycle(); |
253 | |
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254 | return 0; |
255 | } |
256 | |
257 | #undef PAD_DELAY |
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258 | #undef CPUS_RUN |
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259 | |