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#include "rumble.h"
#include "gb.h"
void GB_set_rumble_mode(GB_gameboy_t *gb, GB_rumble_mode_t mode)
{
gb->rumble_mode = mode;
if (gb->rumble_callback) {
gb->rumble_callback(gb, 0);
}
}
void GB_handle_rumble(GB_gameboy_t *gb)
{
if (gb->rumble_callback) {
if (gb->rumble_mode == GB_RUMBLE_DISABLED) {
return;
}
if (gb->cartridge_type->has_rumble &&
(gb->cartridge_type->mbc_type != GB_TPP1 || (gb->rom[0x153] & 1))) {
if (gb->rumble_on_cycles + gb->rumble_off_cycles) {
gb->rumble_callback(gb, gb->rumble_on_cycles / (double)(gb->rumble_on_cycles + gb->rumble_off_cycles));
gb->rumble_on_cycles = gb->rumble_off_cycles = 0;
}
}
else if (gb->rumble_mode == GB_RUMBLE_ALL_GAMES) {
unsigned volume = (gb->io_registers[GB_IO_NR50] & 7) + 1 + ((gb->io_registers[GB_IO_NR50] >> 4) & 7) + 1;
unsigned ch4_volume = volume * (!!(gb->io_registers[GB_IO_NR51] & 8) + !!(gb->io_registers[GB_IO_NR51] & 0x80));
unsigned ch1_volume = volume * (!!(gb->io_registers[GB_IO_NR51] & 1) + !!(gb->io_registers[GB_IO_NR51] & 0x10));
unsigned ch4_divisor = (gb->io_registers[GB_IO_NR43] & 0x07) << 1;
if (!ch4_divisor) ch4_divisor = 1;
unsigned ch4_sample_length = (ch4_divisor << (gb->io_registers[GB_IO_NR43] >> 4)) - 1;
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;
ch4_rumble = MIN(ch4_rumble, 1.0);
ch4_rumble = MAX(ch4_rumble, 0.0);
double ch1_rumble = 0;
if ((gb->io_registers[GB_IO_NR10] & 0x7) && (gb->io_registers[GB_IO_NR10] & 0x70)) {
double sweep_speed = (gb->io_registers[GB_IO_NR10] & 7) / (double)((gb->io_registers[GB_IO_NR10] >> 4) & 7);
ch1_rumble = gb->apu.square_channels[GB_SQUARE_1].current_volume * ch1_volume / 32.0 * sweep_speed / 8.0 - 0.5;
ch1_rumble = MIN(ch1_rumble, 1.0);
ch1_rumble = MAX(ch1_rumble, 0.0);
}
if (!gb->apu.is_active[GB_NOISE]) {
ch4_rumble = 0;
}
if (!gb->apu.is_active[GB_SQUARE_1]) {
ch1_rumble = 0;
}
gb->rumble_callback(gb, MIN(MAX(ch1_rumble / 2 + ch4_rumble, 0.0), 1.0));
}
}
}
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