SameBoy | Accurate GB/GBC emulator |
| download: https://git.y1.nz/archives/sameboy.tar.gz | |
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Core/rumble.c
1 #include "rumble.h"
2 #include "gb.h"
3
4 void GB_set_rumble_mode(GB_gameboy_t *gb, GB_rumble_mode_t mode)
5 {
6 gb->rumble_mode = mode;
7 if (gb->rumble_callback) {
8 gb->rumble_callback(gb, 0);
9 }
10 }
11
12 void GB_handle_rumble(GB_gameboy_t *gb)
13 {
14 if (gb->rumble_callback) {
15 if (gb->rumble_mode == GB_RUMBLE_DISABLED) {
16 return;
17 }
18 if (gb->cartridge_type->has_rumble &&
19 (gb->cartridge_type->mbc_type != GB_TPP1 || (gb->rom[0x153] & 1))) {
20 if (gb->rumble_on_cycles + gb->rumble_off_cycles) {
21 gb->rumble_callback(gb, gb->rumble_on_cycles / (double)(gb->rumble_on_cycles + gb->rumble_off_cycles));
22 gb->rumble_on_cycles = gb->rumble_off_cycles = 0;
23 }
24 }
25 else if (gb->rumble_mode == GB_RUMBLE_ALL_GAMES) {
26 unsigned volume = (gb->io_registers[GB_IO_NR50] & 7) + 1 + ((gb->io_registers[GB_IO_NR50] >> 4) & 7) + 1;
27 unsigned ch4_volume = volume * (!!(gb->io_registers[GB_IO_NR51] & 8) + !!(gb->io_registers[GB_IO_NR51] & 0x80));
28 unsigned ch1_volume = volume * (!!(gb->io_registers[GB_IO_NR51] & 1) + !!(gb->io_registers[GB_IO_NR51] & 0x10));
29 unsigned ch4_divisor = (gb->io_registers[GB_IO_NR43] & 0x07) << 1;
30 if (!ch4_divisor) ch4_divisor = 1;
31 unsigned ch4_sample_length = (ch4_divisor << (gb->io_registers[GB_IO_NR43] >> 4)) - 1;
32
33 double ch4_rumble = (MIN(ch4_sample_length * (gb->apu.noise_channel.narrow? 8 : 1) , 4096) * ((signed) gb->apu.noise_channel.current_volume * gb->apu.noise_channel.current_volume * ch4_volume / 32.0 - 50) - 2048) / 2048.0;
34
35 ch4_rumble = MIN(ch4_rumble, 1.0);
36 ch4_rumble = MAX(ch4_rumble, 0.0);
37
38 double ch1_rumble = 0;
39 if ((gb->io_registers[GB_IO_NR10] & 0x7) && (gb->io_registers[GB_IO_NR10] & 0x70)) {
40 double sweep_speed = (gb->io_registers[GB_IO_NR10] & 7) / (double)((gb->io_registers[GB_IO_NR10] >> 4) & 7);
41 ch1_rumble = gb->apu.square_channels[GB_SQUARE_1].current_volume * ch1_volume / 32.0 * sweep_speed / 8.0 - 0.5;
42 ch1_rumble = MIN(ch1_rumble, 1.0);
43 ch1_rumble = MAX(ch1_rumble, 0.0);
44 }
45
46 if (!gb->apu.is_active[GB_NOISE]) {
47 ch4_rumble = 0;
48 }
49
50 if (!gb->apu.is_active[GB_SQUARE_1]) {
51 ch1_rumble = 0;
52 }
53
54 gb->rumble_callback(gb, MIN(MAX(ch1_rumble / 2 + ch4_rumble, 0.0), 1.0));
55 }
56 }
57 }
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