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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 CPUS_RUN |
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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 | #endif |
22 | |
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23 | static int PicoFrameHints(void) |
24 | { |
25 | struct PicoVideo *pv=&Pico.video; |
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26 | int lines, y, lines_vis = 224, line_sample, skip, vcnt_wrap; |
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27 | int hint; // Hint counter |
28 | |
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29 | pv->v_counter = Pico.m.scanline = 0; |
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30 | |
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31 | if ((PicoOpt&POPT_ALT_RENDERER) && !PicoSkipFrame && (pv->reg[1]&0x40)) { // fast rend., display enabled |
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32 | // draw a frame just after vblank in alternative render mode |
33 | // yes, this will cause 1 frame lag, but this is inaccurate mode anyway. |
34 | PicoFrameFull(); |
35 | #ifdef DRAW_FINISH_FUNC |
36 | DRAW_FINISH_FUNC(); |
37 | #endif |
38 | skip = 1; |
39 | } |
40 | else skip=PicoSkipFrame; |
41 | |
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42 | if (Pico.m.pal) { |
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43 | line_sample = 68; |
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44 | if (pv->reg[1]&8) lines_vis = 240; |
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45 | } else { |
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46 | line_sample = 93; |
47 | } |
48 | |
49 | SekCyclesReset(); |
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50 | z80_resetCycles(); |
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51 | #ifdef PICO_CD |
52 | SekCyclesResetS68k(); |
53 | #endif |
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54 | PsndDacLine = 0; |
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55 | emustatus &= ~1; |
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56 | |
57 | pv->status&=~0x88; // clear V-Int, come out of vblank |
58 | |
59 | hint=pv->reg[10]; // Load H-Int counter |
60 | //dprintf("-hint: %i", hint); |
61 | |
62 | // This is to make active scan longer (needed for Double Dragon 2, mainly) |
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63 | CPUS_RUN(CYCLES_M68K_ASD, CYCLES_S68K_ASD); |
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64 | |
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65 | for (y = 0; y < lines_vis; y++) |
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66 | { |
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67 | pv->v_counter = Pico.m.scanline = y; |
68 | if ((pv->reg[12]&6) == 6) { // interlace mode 2 |
69 | pv->v_counter <<= 1; |
70 | pv->v_counter |= pv->v_counter >> 8; |
71 | pv->v_counter &= 0xff; |
72 | } |
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73 | |
74 | // VDP FIFO |
75 | pv->lwrite_cnt -= 12; |
76 | if (pv->lwrite_cnt <= 0) { |
77 | pv->lwrite_cnt=0; |
78 | Pico.video.status|=0x200; |
79 | } |
80 | |
81 | PAD_DELAY |
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82 | #ifdef PICO_CD |
83 | check_cd_dma(); |
84 | #endif |
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85 | #ifdef PICO_32X |
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86 | p32x_pwm_irq_check(1); |
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87 | #endif |
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88 | |
89 | // H-Interrupts: |
90 | if (--hint < 0) // y <= lines_vis: Comix Zone, Golden Axe |
91 | { |
92 | hint=pv->reg[10]; // Reload H-Int counter |
93 | pv->pending_ints|=0x10; |
94 | if (pv->reg[0]&0x10) { |
95 | elprintf(EL_INTS, "hint: @ %06x [%i]", SekPc, SekCycleCnt); |
96 | SekInterrupt(4); |
97 | } |
98 | } |
99 | |
100 | // decide if we draw this line |
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101 | if (!skip && (PicoOpt & POPT_ALT_RENDERER)) |
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102 | { |
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103 | // find the right moment for frame renderer, when display is no longer blanked |
104 | if ((pv->reg[1]&0x40) || y > 100) { |
105 | PicoFrameFull(); |
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106 | #ifdef DRAW_FINISH_FUNC |
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107 | DRAW_FINISH_FUNC(); |
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108 | #endif |
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109 | skip = 1; |
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110 | } |
111 | } |
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112 | |
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113 | // get samples from sound chips |
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114 | if ((y == 224 || y == line_sample) && PsndOut) |
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115 | { |
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116 | if (Pico.m.z80Run && !Pico.m.z80_reset && (PicoOpt&POPT_EN_Z80)) |
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117 | PicoSyncZ80(SekCycleCnt); |
118 | if (ym2612.dacen && PsndDacLine <= y) |
119 | PsndDoDAC(y); |
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120 | PsndGetSamples(y); |
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121 | } |
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122 | |
123 | // Run scanline: |
124 | if (Pico.m.dma_xfers) SekCyclesBurn(CheckDMA()); |
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125 | CPUS_RUN(CYCLES_M68K_LINE, CYCLES_S68K_LINE); |
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126 | |
127 | #ifdef PICO_CD |
128 | update_chips(); |
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129 | #else |
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130 | if (PicoLineHook) PicoLineHook(); |
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131 | #endif |
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132 | } |
133 | |
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134 | if (!skip) |
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135 | { |
136 | if (DrawScanline < y) |
137 | PicoDrawSync(y - 1, 0); |
138 | #ifdef DRAW_FINISH_FUNC |
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139 | DRAW_FINISH_FUNC(); |
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140 | #endif |
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141 | } |
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142 | |
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143 | // V-int line (224 or 240) |
144 | Pico.m.scanline = y; |
145 | pv->v_counter = 0xe0; // bad for 240 mode |
146 | if ((pv->reg[12]&6) == 6) pv->v_counter = 0xc1; |
147 | |
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148 | // VDP FIFO |
149 | pv->lwrite_cnt=0; |
150 | Pico.video.status|=0x200; |
151 | |
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152 | memcpy(PicoPadInt, PicoPad, sizeof(PicoPadInt)); |
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153 | PAD_DELAY |
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154 | #ifdef PICO_CD |
155 | check_cd_dma(); |
156 | #endif |
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157 | #ifdef PICO_32X |
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158 | p32x_pwm_irq_check(1); |
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159 | #endif |
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160 | |
161 | // Last H-Int: |
162 | if (--hint < 0) |
163 | { |
164 | hint=pv->reg[10]; // Reload H-Int counter |
165 | pv->pending_ints|=0x10; |
166 | //printf("rhint: %i @ %06x [%i|%i]\n", hint, SekPc, y, SekCycleCnt); |
167 | if (pv->reg[0]&0x10) SekInterrupt(4); |
168 | } |
169 | |
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170 | pv->status|=0x08; // go into vblank |
171 | pv->pending_ints|=0x20; |
172 | |
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173 | #ifdef PICO_32X |
174 | p32x_start_blank(); |
175 | #endif |
176 | |
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177 | // the following SekRun is there for several reasons: |
178 | // there must be a delay after vblank bit is set and irq is asserted (Mazin Saga) |
179 | // also delay between F bit (bit 7) is set in SR and IRQ happens (Ex-Mutants) |
180 | // also delay between last H-int and V-int (Golden Axe 3) |
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181 | SekRunM68k(CYCLES_M68K_VINT_LAG); |
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182 | |
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183 | if (pv->reg[1]&0x20) { |
184 | elprintf(EL_INTS, "vint: @ %06x [%i]", SekPc, SekCycleCnt); |
185 | SekInterrupt(6); |
186 | } |
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187 | if (Pico.m.z80Run && !Pico.m.z80_reset && (PicoOpt&POPT_EN_Z80)) { |
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188 | PicoSyncZ80(SekCycleCnt); |
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189 | elprintf(EL_INTS, "zint"); |
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190 | z80_int(); |
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191 | } |
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192 | |
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193 | // get samples from sound chips |
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194 | if (y == 224 && PsndOut) |
195 | { |
196 | if (ym2612.dacen && PsndDacLine <= y) |
197 | PsndDoDAC(y); |
198 | PsndGetSamples(y); |
199 | } |
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200 | |
201 | // Run scanline: |
202 | if (Pico.m.dma_xfers) SekCyclesBurn(CheckDMA()); |
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203 | CPUS_RUN(CYCLES_M68K_LINE - CYCLES_M68K_VINT_LAG - CYCLES_M68K_ASD, |
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204 | CYCLES_S68K_LINE - CYCLES_S68K_ASD); |
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205 | |
206 | #ifdef PICO_CD |
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207 | update_chips(); |
208 | #else |
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209 | if (PicoLineHook) PicoLineHook(); |
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210 | #endif |
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211 | |
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212 | lines = scanlines_total; |
213 | vcnt_wrap = Pico.m.pal ? 0x103 : 0xEB; // based on Gens, TODO: verify |
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214 | |
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215 | for (y++; y < lines; y++) |
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216 | { |
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217 | pv->v_counter = Pico.m.scanline = y; |
218 | if (y >= vcnt_wrap) |
219 | pv->v_counter -= Pico.m.pal ? 56 : 6; |
220 | if ((pv->reg[12]&6) == 6) |
221 | pv->v_counter = (pv->v_counter << 1) | 1; |
222 | pv->v_counter &= 0xff; |
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223 | |
224 | PAD_DELAY |
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225 | #ifdef PICO_CD |
226 | check_cd_dma(); |
227 | #endif |
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228 | #ifdef PICO_32X |
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229 | p32x_pwm_irq_check(1); |
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230 | #endif |
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231 | |
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232 | // Run scanline: |
233 | if (Pico.m.dma_xfers) SekCyclesBurn(CheckDMA()); |
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234 | CPUS_RUN(CYCLES_M68K_LINE, CYCLES_S68K_LINE); |
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235 | |
236 | #ifdef PICO_CD |
237 | update_chips(); |
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238 | #else |
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239 | if (PicoLineHook) PicoLineHook(); |
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240 | #endif |
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241 | } |
242 | |
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243 | // sync z80 |
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244 | if (Pico.m.z80Run && !Pico.m.z80_reset && (PicoOpt&POPT_EN_Z80)) |
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245 | PicoSyncZ80(Pico.m.pal ? 151809 : 127671); // cycles adjusted for converter |
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246 | if (PsndOut && ym2612.dacen && PsndDacLine <= lines-1) |
247 | PsndDoDAC(lines-1); |
248 | |
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249 | timers_cycle(); |
250 | |
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251 | return 0; |
252 | } |
253 | |
254 | #undef PAD_DELAY |
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255 | #undef CPUS_RUN |
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256 | |