69996cb7 |
1 | #define CYCLES_M68K_LINE 488 // suitable for both PAL/NTSC |
2 | #define CYCLES_M68K_VINT_LAG 68 |
3 | #define CYCLES_M68K_ASD 148 |
4 | #define CYCLES_Z80_LINE 228 |
5 | #define CYCLES_Z80_ASD 69 |
6 | |
7 | // pad delay (for 6 button pads) |
8 | #define PAD_DELAY \ |
9 | if (PicoOpt&0x20) { \ |
10 | if(Pico.m.padDelay[0]++ > 25) Pico.m.padTHPhase[0]=0; \ |
11 | if(Pico.m.padDelay[1]++ > 25) Pico.m.padTHPhase[1]=0; \ |
12 | } |
13 | |
14 | #define Z80_RUN(z80_cycles) \ |
15 | { \ |
16 | if ((PicoOpt&4) && Pico.m.z80Run) \ |
17 | { \ |
18 | if (Pico.m.z80Run & 2) z80CycleAim += z80_cycles; \ |
19 | else { \ |
20 | int cnt = SekCyclesDone() - z80startCycle; \ |
21 | cnt = (cnt>>1)-(cnt>>5); \ |
22 | if (cnt > (z80_cycles)) cnt = z80_cycles; \ |
23 | Pico.m.z80Run |= 2; \ |
24 | z80CycleAim+=cnt; \ |
25 | } \ |
26 | total_z80+=z80_run(z80CycleAim-total_z80); \ |
27 | } \ |
28 | } |
29 | |
30 | // Accurate but slower frame which does hints |
31 | static int PicoFrameHints(void) |
32 | { |
33 | struct PicoVideo *pv=&Pico.video; |
34 | int total_z80=0,lines,y,lines_vis = 224,z80CycleAim = 0,line_sample; |
35 | int skip=PicoSkipFrame || (PicoOpt&0x10); |
36 | int hint; // Hint counter |
37 | |
38 | if (Pico.m.pal) { |
39 | //cycles_68k = (int) ((double) OSC_PAL / 7 / 50 / 312 + 0.4); // should compile to a constant (488) |
40 | //cycles_z80 = (int) ((double) OSC_PAL / 15 / 50 / 312 + 0.4); // 228 |
41 | line_sample = 68; |
42 | if(pv->reg[1]&8) lines_vis = 240; |
43 | } else { |
44 | //cycles_68k = (int) ((double) OSC_NTSC / 7 / 60 / 262 + 0.4); // 488 |
45 | //cycles_z80 = (int) ((double) OSC_NTSC / 15 / 60 / 262 + 0.4); // 228 |
46 | line_sample = 93; |
47 | } |
48 | |
49 | SekCyclesReset(); |
50 | |
51 | pv->status&=~0x88; // clear V-Int, come out of vblank |
52 | |
53 | hint=pv->reg[10]; // Load H-Int counter |
54 | //dprintf("-hint: %i", hint); |
55 | |
56 | // This is to make active scan longer (needed for Double Dragon 2, mainly) |
57 | SekRun(CYCLES_M68K_ASD); |
58 | Z80_RUN(CYCLES_Z80_ASD); |
59 | |
60 | for (y=0;y<lines_vis;y++) |
61 | { |
62 | Pico.m.scanline=(short)y; |
63 | |
64 | // VDP FIFO |
65 | pv->lwrite_cnt -= 12; |
66 | if (pv->lwrite_cnt <= 0) { |
67 | pv->lwrite_cnt=0; |
68 | Pico.video.status|=0x200; |
69 | } |
70 | |
71 | PAD_DELAY |
72 | |
73 | // H-Interrupts: |
74 | if (--hint < 0) // y <= lines_vis: Comix Zone, Golden Axe |
75 | { |
76 | hint=pv->reg[10]; // Reload H-Int counter |
77 | pv->pending_ints|=0x10; |
78 | if (pv->reg[0]&0x10) { |
79 | elprintf(EL_INTS, "hint: @ %06x [%i]", SekPc, SekCycleCnt); |
80 | SekInterrupt(4); |
81 | } |
82 | } |
83 | |
84 | // decide if we draw this line |
85 | #if CAN_HANDLE_240_LINES |
86 | if(!skip && ((!(pv->reg[1]&8) && y<224) || (pv->reg[1]&8)) ) |
87 | #else |
88 | if(!skip && y<224) |
89 | #endif |
90 | PicoLine(y); |
91 | |
92 | if(PicoOpt&1) |
93 | sound_timers_and_dac(y); |
94 | |
95 | // get samples from sound chips |
96 | if(y == 32 && PsndOut) |
97 | emustatus &= ~1; |
98 | else if((y == 224 || y == line_sample) && PsndOut) |
99 | getSamples(y); |
100 | |
101 | // Run scanline: |
102 | if (Pico.m.dma_xfers) SekCyclesBurn(CheckDMA()); |
103 | SekRun(CYCLES_M68K_LINE); |
104 | Z80_RUN(CYCLES_Z80_LINE); |
105 | } |
106 | |
107 | // V-int line (224 or 240) |
108 | Pico.m.scanline=(short)y; |
109 | |
110 | // VDP FIFO |
111 | pv->lwrite_cnt=0; |
112 | Pico.video.status|=0x200; |
113 | |
114 | PAD_DELAY |
115 | |
116 | // Last H-Int: |
117 | if (--hint < 0) |
118 | { |
119 | hint=pv->reg[10]; // Reload H-Int counter |
120 | pv->pending_ints|=0x10; |
121 | //printf("rhint: %i @ %06x [%i|%i]\n", hint, SekPc, y, SekCycleCnt); |
122 | if (pv->reg[0]&0x10) SekInterrupt(4); |
123 | } |
124 | |
125 | // V-Interrupt: |
126 | pv->status|=0x08; // go into vblank |
127 | pv->pending_ints|=0x20; |
128 | |
129 | // the following SekRun is there for several reasons: |
130 | // there must be a delay after vblank bit is set and irq is asserted (Mazin Saga) |
131 | // also delay between F bit (bit 7) is set in SR and IRQ happens (Ex-Mutants) |
132 | // also delay between last H-int and V-int (Golden Axe 3) |
133 | SekRun(CYCLES_M68K_VINT_LAG); |
134 | if (pv->reg[1]&0x20) { |
135 | elprintf(EL_INTS, "vint: @ %06x [%i]", SekPc, SekCycleCnt); |
136 | SekInterrupt(6); |
137 | } |
138 | if (Pico.m.z80Run && (PicoOpt&4)) |
139 | z80_int(); |
140 | |
141 | if (PicoOpt&1) |
142 | sound_timers_and_dac(y); |
143 | |
144 | // get samples from sound chips |
145 | if ((y == 224) && PsndOut) |
146 | getSamples(y); |
147 | |
148 | // Run scanline: |
149 | if (Pico.m.dma_xfers) SekCyclesBurn(CheckDMA()); |
150 | SekRun(CYCLES_M68K_LINE - CYCLES_M68K_VINT_LAG - CYCLES_M68K_ASD); |
151 | Z80_RUN(CYCLES_Z80_LINE - CYCLES_Z80_ASD); |
152 | |
153 | // PAL line count might actually be 313 according to Steve Snake, but that would complicate things. |
154 | lines = Pico.m.pal ? 312 : 262; |
155 | |
156 | for (y++;y<lines;y++) |
157 | { |
158 | Pico.m.scanline=(short)y; |
159 | |
160 | PAD_DELAY |
161 | |
162 | if(PicoOpt&1) |
163 | sound_timers_and_dac(y); |
164 | |
165 | // Run scanline: |
166 | if (Pico.m.dma_xfers) SekCyclesBurn(CheckDMA()); |
167 | SekRun(CYCLES_M68K_LINE); |
168 | Z80_RUN(CYCLES_Z80_LINE); |
169 | } |
170 | |
171 | // draw a frame just after vblank in alternative render mode |
172 | if (!PicoSkipFrame && (PicoOpt&0x10)) |
173 | PicoFrameFull(); |
174 | |
175 | return 0; |
176 | } |
177 | |
178 | #undef PAD_DELAY |
179 | #undef Z80_RUN |
180 | |