2020-04-29 13:06:11 +00:00
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#include "rumble.h"
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#include "gb.h"
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2020-04-29 13:50:31 +00:00
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void GB_set_rumble_mode(GB_gameboy_t *gb, GB_rumble_mode_t mode)
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{
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gb->rumble_mode = mode;
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if (gb->rumble_callback) {
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gb->rumble_callback(gb, 0);
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}
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}
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2020-04-29 13:06:11 +00:00
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void GB_handle_rumble(GB_gameboy_t *gb)
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{
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if (gb->rumble_callback) {
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2020-04-29 13:50:31 +00:00
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if (gb->rumble_mode == GB_RUMBLE_DISABLED) {
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return;
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}
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2020-04-29 13:06:11 +00:00
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if (gb->cartridge_type->has_rumble) {
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if (gb->rumble_on_cycles + gb->rumble_off_cycles) {
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gb->rumble_callback(gb, gb->rumble_on_cycles / (double)(gb->rumble_on_cycles + gb->rumble_off_cycles));
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gb->rumble_on_cycles = gb->rumble_off_cycles = 0;
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}
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}
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2020-04-29 13:50:31 +00:00
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else if (gb->rumble_mode == GB_RUMBLE_ALL_GAMES) {
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2020-04-29 13:06:11 +00:00
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unsigned volume = (gb->io_registers[GB_IO_NR50] & 7) + 1 + ((gb->io_registers[GB_IO_NR50] >> 4) & 7) + 1;
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unsigned ch4_volume = volume * (!!(gb->io_registers[GB_IO_NR51] & 8) + !!(gb->io_registers[GB_IO_NR51] & 0x80));
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unsigned ch1_volume = volume * (!!(gb->io_registers[GB_IO_NR51] & 1) + !!(gb->io_registers[GB_IO_NR51] & 0x10));
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2020-12-12 14:02:25 +00:00
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unsigned ch4_divisor = (gb->io_registers[GB_IO_NR43] & 0x07) << 1;
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if (!ch4_divisor) ch4_divisor = 1;
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unsigned ch4_sample_length = (ch4_divisor << (gb->io_registers[GB_IO_NR43] >> 4)) - 1;
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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;
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2020-04-29 13:06:11 +00:00
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ch4_rumble = MIN(ch4_rumble, 1.0);
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ch4_rumble = MAX(ch4_rumble, 0.0);
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double ch1_rumble = 0;
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2020-12-01 12:17:35 +00:00
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if ((gb->io_registers[GB_IO_NR10] & 0x7) && (gb->io_registers[GB_IO_NR10] & 0x70)) {
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2020-04-29 13:06:11 +00:00
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double sweep_speed = (gb->io_registers[GB_IO_NR10] & 7) / (double)((gb->io_registers[GB_IO_NR10] >> 4) & 7);
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ch1_rumble = gb->apu.square_channels[GB_SQUARE_1].current_volume * ch1_volume / 32.0 * sweep_speed / 8.0 - 0.5;
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ch1_rumble = MIN(ch1_rumble, 1.0);
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ch1_rumble = MAX(ch1_rumble, 0.0);
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}
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if (!gb->apu.is_active[GB_NOISE]) {
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ch4_rumble = 0;
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}
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if (!gb->apu.is_active[GB_SQUARE_1]) {
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ch1_rumble = 0;
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}
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gb->rumble_callback(gb, MIN(MAX(ch1_rumble / 2 + ch4_rumble, 0.0), 1.0));
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}
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}
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}
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