| 1 | /* |
| 2 | * common code for base/cd/32x |
| 3 | * (C) notaz, 2007-2009,2013 |
| 4 | * |
| 5 | * This work is licensed under the terms of MAME license. |
| 6 | * See COPYING file in the top-level directory. |
| 7 | */ |
| 8 | |
| 9 | #define CYCLES_M68K_LINE 488 // suitable for both PAL/NTSC |
| 10 | #define CYCLES_M68K_VINT_LAG 68 |
| 11 | |
| 12 | // pad delay (for 6 button pads) |
| 13 | #define PAD_DELAY() { \ |
| 14 | if(Pico.m.padDelay[0]++ > 25) Pico.m.padTHPhase[0]=0; \ |
| 15 | if(Pico.m.padDelay[1]++ > 25) Pico.m.padTHPhase[1]=0; \ |
| 16 | } |
| 17 | |
| 18 | // CPUS_RUN |
| 19 | #ifndef CPUS_RUN |
| 20 | #define CPUS_RUN(m68k_cycles) \ |
| 21 | SekRunM68k(m68k_cycles) |
| 22 | #endif |
| 23 | |
| 24 | // sync m68k to SekCycleAim |
| 25 | static void SekSyncM68k(void) |
| 26 | { |
| 27 | int cyc_do; |
| 28 | pprof_start(m68k); |
| 29 | pevt_log_m68k_o(EVT_RUN_START); |
| 30 | |
| 31 | while ((cyc_do = SekCycleAim - SekCycleCnt) > 0) { |
| 32 | SekCycleCnt += cyc_do; |
| 33 | |
| 34 | #if defined(EMU_C68K) |
| 35 | PicoCpuCM68k.cycles = cyc_do; |
| 36 | CycloneRun(&PicoCpuCM68k); |
| 37 | SekCycleCnt -= PicoCpuCM68k.cycles; |
| 38 | #elif defined(EMU_M68K) |
| 39 | SekCycleCnt += m68k_execute(cyc_do) - cyc_do; |
| 40 | #elif defined(EMU_F68K) |
| 41 | SekCycleCnt += fm68k_emulate(cyc_do, 0) - cyc_do; |
| 42 | #endif |
| 43 | } |
| 44 | |
| 45 | SekCyclesLeft = 0; |
| 46 | |
| 47 | SekTrace(0); |
| 48 | pevt_log_m68k_o(EVT_RUN_END); |
| 49 | pprof_end(m68k); |
| 50 | } |
| 51 | |
| 52 | static inline void SekRunM68k(int cyc) |
| 53 | { |
| 54 | SekCycleAim += cyc; |
| 55 | cyc = SekCycleAim - SekCycleCnt; |
| 56 | if (cyc <= 0) |
| 57 | return; |
| 58 | SekCycleCnt += cyc >> 6; // refresh slowdowns |
| 59 | SekSyncM68k(); |
| 60 | } |
| 61 | |
| 62 | static void do_hint(struct PicoVideo *pv) |
| 63 | { |
| 64 | pv->pending_ints |= 0x10; |
| 65 | if (pv->reg[0] & 0x10) { |
| 66 | elprintf(EL_INTS, "hint: @ %06x [%u]", SekPc, SekCyclesDone()); |
| 67 | SekInterrupt(4); |
| 68 | } |
| 69 | } |
| 70 | |
| 71 | static int PicoFrameHints(void) |
| 72 | { |
| 73 | struct PicoVideo *pv = &Pico.video; |
| 74 | int line_sample = Pico.m.pal ? 68 : 93; |
| 75 | int lines, y, lines_vis, skip; |
| 76 | int vcnt_wrap, vcnt_adj; |
| 77 | unsigned int cycles; |
| 78 | int hint; // Hint counter |
| 79 | |
| 80 | pevt_log_m68k_o(EVT_FRAME_START); |
| 81 | pv->v_counter = Pico.m.scanline = 0; |
| 82 | |
| 83 | if ((PicoOpt&POPT_ALT_RENDERER) && !PicoSkipFrame && (pv->reg[1]&0x40)) { // fast rend., display enabled |
| 84 | // draw a frame just after vblank in alternative render mode |
| 85 | // yes, this will cause 1 frame lag, but this is inaccurate mode anyway. |
| 86 | PicoFrameFull(); |
| 87 | #ifdef DRAW_FINISH_FUNC |
| 88 | DRAW_FINISH_FUNC(); |
| 89 | #endif |
| 90 | skip = 1; |
| 91 | } |
| 92 | else skip=PicoSkipFrame; |
| 93 | |
| 94 | z80_resetCycles(); |
| 95 | PsndStartFrame(); |
| 96 | |
| 97 | // Load H-Int counter |
| 98 | hint = (pv->status & PVS_ACTIVE) ? pv->hint_cnt : pv->reg[10]; |
| 99 | |
| 100 | pv->status |= PVS_ACTIVE; |
| 101 | |
| 102 | for (y = 0; ; y++) |
| 103 | { |
| 104 | pv->v_counter = Pico.m.scanline = y; |
| 105 | if ((pv->reg[12]&6) == 6) { // interlace mode 2 |
| 106 | pv->v_counter <<= 1; |
| 107 | pv->v_counter |= pv->v_counter >> 8; |
| 108 | pv->v_counter &= 0xff; |
| 109 | } |
| 110 | |
| 111 | if ((y == 224 && !(pv->reg[1] & 8)) || y == 240) |
| 112 | break; |
| 113 | |
| 114 | // VDP FIFO |
| 115 | pv->lwrite_cnt -= 12; |
| 116 | if (pv->lwrite_cnt <= 0) { |
| 117 | pv->lwrite_cnt = 0; |
| 118 | Pico.video.status |= SR_EMPT; |
| 119 | } |
| 120 | |
| 121 | PAD_DELAY(); |
| 122 | |
| 123 | // H-Interrupts: |
| 124 | if (--hint < 0) |
| 125 | { |
| 126 | hint = pv->reg[10]; // Reload H-Int counter |
| 127 | do_hint(pv); |
| 128 | } |
| 129 | |
| 130 | // decide if we draw this line |
| 131 | if (!skip && (PicoOpt & POPT_ALT_RENDERER)) |
| 132 | { |
| 133 | // find the right moment for frame renderer, when display is no longer blanked |
| 134 | if ((pv->reg[1]&0x40) || y > 100) { |
| 135 | PicoFrameFull(); |
| 136 | #ifdef DRAW_FINISH_FUNC |
| 137 | DRAW_FINISH_FUNC(); |
| 138 | #endif |
| 139 | skip = 1; |
| 140 | } |
| 141 | } |
| 142 | |
| 143 | // get samples from sound chips |
| 144 | if ((y == 224 || y == line_sample) && PsndOut) |
| 145 | { |
| 146 | cycles = SekCyclesDone(); |
| 147 | |
| 148 | if (Pico.m.z80Run && !Pico.m.z80_reset && (PicoOpt&POPT_EN_Z80)) |
| 149 | PicoSyncZ80(cycles); |
| 150 | #ifdef PICO_CD |
| 151 | if (PicoAHW & PAHW_MCD) |
| 152 | pcd_sync_s68k(cycles, 0); |
| 153 | #endif |
| 154 | #ifdef PICO_32X |
| 155 | p32x_sync_sh2s(cycles); |
| 156 | #endif |
| 157 | PsndGetSamples(y); |
| 158 | } |
| 159 | |
| 160 | // Run scanline: |
| 161 | line_base_cycles = SekCyclesDone(); |
| 162 | if (Pico.m.dma_xfers) SekCyclesBurn(CheckDMA()); |
| 163 | CPUS_RUN(CYCLES_M68K_LINE); |
| 164 | |
| 165 | if (PicoLineHook) PicoLineHook(); |
| 166 | pevt_log_m68k_o(EVT_NEXT_LINE); |
| 167 | } |
| 168 | |
| 169 | lines_vis = (pv->reg[1] & 8) ? 240 : 224; |
| 170 | if (y == lines_vis) |
| 171 | pv->status &= ~PVS_ACTIVE; |
| 172 | |
| 173 | if (!skip) |
| 174 | { |
| 175 | if (Pico.est.DrawScanline < y) |
| 176 | PicoDrawSync(y - 1, 0); |
| 177 | #ifdef DRAW_FINISH_FUNC |
| 178 | DRAW_FINISH_FUNC(); |
| 179 | #endif |
| 180 | } |
| 181 | |
| 182 | // VDP FIFO |
| 183 | pv->lwrite_cnt = 0; |
| 184 | Pico.video.status |= SR_EMPT; |
| 185 | |
| 186 | memcpy(PicoPadInt, PicoPad, sizeof(PicoPadInt)); |
| 187 | PAD_DELAY(); |
| 188 | |
| 189 | // Last H-Int (normally): |
| 190 | if (--hint < 0) |
| 191 | { |
| 192 | hint = pv->reg[10]; // Reload H-Int counter |
| 193 | do_hint(pv); |
| 194 | } |
| 195 | |
| 196 | pv->status |= SR_VB; // go into vblank |
| 197 | pv->pending_ints |= 0x20; |
| 198 | |
| 199 | // the following SekRun is there for several reasons: |
| 200 | // there must be a delay after vblank bit is set and irq is asserted (Mazin Saga) |
| 201 | // also delay between F bit (bit 7) is set in SR and IRQ happens (Ex-Mutants) |
| 202 | // also delay between last H-int and V-int (Golden Axe 3) |
| 203 | line_base_cycles = SekCyclesDone(); |
| 204 | if (Pico.m.dma_xfers) SekCyclesBurn(CheckDMA()); |
| 205 | CPUS_RUN(CYCLES_M68K_VINT_LAG); |
| 206 | |
| 207 | if (pv->reg[1] & 0x20) { |
| 208 | elprintf(EL_INTS, "vint: @ %06x [%u]", SekPc, SekCyclesDone()); |
| 209 | SekInterrupt(6); |
| 210 | } |
| 211 | |
| 212 | cycles = SekCyclesDone(); |
| 213 | if (Pico.m.z80Run && !Pico.m.z80_reset && (PicoOpt&POPT_EN_Z80)) { |
| 214 | PicoSyncZ80(cycles); |
| 215 | elprintf(EL_INTS, "zint"); |
| 216 | z80_int(); |
| 217 | } |
| 218 | |
| 219 | #ifdef PICO_CD |
| 220 | if (PicoAHW & PAHW_MCD) |
| 221 | pcd_sync_s68k(cycles, 0); |
| 222 | #endif |
| 223 | #ifdef PICO_32X |
| 224 | p32x_sync_sh2s(cycles); |
| 225 | p32x_start_blank(); |
| 226 | #endif |
| 227 | |
| 228 | // get samples from sound chips |
| 229 | if (y == 224 && PsndOut) |
| 230 | PsndGetSamples(y); |
| 231 | |
| 232 | // Run scanline: |
| 233 | CPUS_RUN(CYCLES_M68K_LINE - CYCLES_M68K_VINT_LAG); |
| 234 | |
| 235 | if (PicoLineHook) PicoLineHook(); |
| 236 | pevt_log_m68k_o(EVT_NEXT_LINE); |
| 237 | |
| 238 | if (Pico.m.pal) { |
| 239 | lines = 313; |
| 240 | vcnt_wrap = 0x103; |
| 241 | vcnt_adj = 57; |
| 242 | } |
| 243 | else { |
| 244 | lines = 262; |
| 245 | vcnt_wrap = 0xEB; |
| 246 | vcnt_adj = 6; |
| 247 | } |
| 248 | |
| 249 | for (y++; y < lines - 1; y++) |
| 250 | { |
| 251 | pv->v_counter = Pico.m.scanline = y; |
| 252 | if (y >= vcnt_wrap) |
| 253 | pv->v_counter -= vcnt_adj; |
| 254 | if ((pv->reg[12]&6) == 6) |
| 255 | pv->v_counter = (pv->v_counter << 1) | 1; |
| 256 | pv->v_counter &= 0xff; |
| 257 | |
| 258 | PAD_DELAY(); |
| 259 | |
| 260 | if ((pv->status & PVS_ACTIVE) && --hint < 0) |
| 261 | { |
| 262 | hint = pv->reg[10]; // Reload H-Int counter |
| 263 | do_hint(pv); |
| 264 | } |
| 265 | |
| 266 | // Run scanline: |
| 267 | line_base_cycles = SekCyclesDone(); |
| 268 | if (Pico.m.dma_xfers) SekCyclesBurn(CheckDMA()); |
| 269 | CPUS_RUN(CYCLES_M68K_LINE); |
| 270 | |
| 271 | if (PicoLineHook) PicoLineHook(); |
| 272 | pevt_log_m68k_o(EVT_NEXT_LINE); |
| 273 | } |
| 274 | |
| 275 | pv->status &= ~SR_VB; |
| 276 | |
| 277 | // last scanline |
| 278 | Pico.m.scanline = y; |
| 279 | pv->v_counter = 0xff; |
| 280 | |
| 281 | PAD_DELAY(); |
| 282 | |
| 283 | if ((pv->status & PVS_ACTIVE) && --hint < 0) |
| 284 | { |
| 285 | hint = pv->reg[10]; // Reload H-Int counter |
| 286 | do_hint(pv); |
| 287 | } |
| 288 | |
| 289 | // Run scanline: |
| 290 | line_base_cycles = SekCyclesDone(); |
| 291 | if (Pico.m.dma_xfers) SekCyclesBurn(CheckDMA()); |
| 292 | CPUS_RUN(CYCLES_M68K_LINE); |
| 293 | |
| 294 | if (PicoLineHook) PicoLineHook(); |
| 295 | pevt_log_m68k_o(EVT_NEXT_LINE); |
| 296 | |
| 297 | // sync cpus |
| 298 | cycles = SekCyclesDone(); |
| 299 | if (Pico.m.z80Run && !Pico.m.z80_reset && (PicoOpt&POPT_EN_Z80)) |
| 300 | PicoSyncZ80(cycles); |
| 301 | if (PsndOut && ym2612.dacen && PsndDacLine < lines) |
| 302 | PsndDoDAC(lines - 1); |
| 303 | if (PsndOut && PsndPsgLine < lines) |
| 304 | PsndDoPSG(lines - 1); |
| 305 | |
| 306 | #ifdef PICO_CD |
| 307 | if (PicoAHW & PAHW_MCD) |
| 308 | pcd_sync_s68k(cycles, 0); |
| 309 | #endif |
| 310 | #ifdef PICO_32X |
| 311 | p32x_sync_sh2s(cycles); |
| 312 | #endif |
| 313 | timers_cycle(); |
| 314 | |
| 315 | pv->hint_cnt = hint; |
| 316 | |
| 317 | return 0; |
| 318 | } |
| 319 | |
| 320 | #undef PAD_DELAY |
| 321 | #undef CPUS_RUN |
| 322 | |
| 323 | // vim:shiftwidth=2:ts=2:expandtab |