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SameBoy
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Add initial edge trigger detection method 

- GB_get_channel_edge_triggered()
This commit is contained in:
Noah Sweilem 2023-06-11 15:27:31 -07:00
parent 5c7b1f01a3
commit 7bdf8dbe47
2 changed files with 35 additions and 0 deletions
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28
Core/apu.c
View File

@ -726,6 +726,7 @@ void GB_apu_run(GB_gameboy_t *gb, bool force)
gb->apu.pcm_mask[0] &= i == GB_SQUARE_1? 0xF0 : 0x0F;
}
gb->apu.square_channels[i].did_tick = true;
gb->apu.square_channels[i].edge_triggered = true;
update_square_sample(gb, i);
}
if (cycles_left) {
@ -746,6 +747,7 @@ void GB_apu_run(GB_gameboy_t *gb, bool force)
gb->io_registers[GB_IO_WAV_START + (gb->apu.wave_channel.current_sample_index >> 1)];
update_wave_sample(gb, cycles - cycles_left);
gb->apu.wave_channel.wave_form_just_read = true;
gb->apu.wave_channel.edge_triggered = true;
}
if (cycles_left) {
gb->apu.wave_channel.sample_countdown -= cycles_left;
@ -805,6 +807,7 @@ void GB_apu_run(GB_gameboy_t *gb, bool force)
}
else {
gb->apu.noise_channel.countdown_reloaded = true;
gb->apu.noise_channel.edge_triggered = true;
}
}
}
@ -1796,3 +1799,28 @@ void GB_get_apu_wave_table(GB_gameboy_t *gb, uint8_t *wave_table) {
wave_table[2 * (i - GB_IO_WAV_START) + 1] = gb->io_registers[i] & 0xF;
}
}
bool GB_get_channel_edge_triggered(GB_gameboy_t *gb, GB_channel_t channel) {
bool edge_triggered;
switch (channel) {
case GB_SQUARE_1:
case GB_SQUARE_2:
edge_triggered = gb->apu.square_channels[channel].edge_triggered;
gb->apu.square_channels[channel].edge_triggered = false;
break;
case GB_WAVE:
edge_triggered = gb->apu.wave_channel.edge_triggered;
gb->apu.wave_channel.edge_triggered = false;
break;
case GB_NOISE:
edge_triggered = gb->apu.noise_channel.edge_triggered;
gb->apu.noise_channel.edge_triggered = false;
break;
default:
return false;
}
return edge_triggered;
}

7
Core/apu.h
View File

@ -92,6 +92,8 @@ typedef struct
GB_envelope_clock_t envelope_clock;
uint8_t delay; // Hack for CGB D/E phantom step due to how sample_countdown is implemented in SameBoy
bool did_tick;
bool edge_triggered;
} square_channels[2];
struct {
@ -107,6 +109,8 @@ typedef struct
bool wave_form_just_read;
bool pulsed;
uint8_t bugged_read_countdown;
bool edge_triggered;
} wave_channel;
struct {
@ -127,6 +131,8 @@ typedef struct
bool countdown_reloaded;
uint8_t dmg_delayed_start;
GB_envelope_clock_t envelope_clock;
bool edge_triggered;
} noise_channel;
GB_ENUM(uint8_t, {
@ -192,6 +198,7 @@ uint8_t GB_get_channel_volume(GB_gameboy_t *gb, GB_channel_t channel);
uint8_t GB_get_channel_amplitude(GB_gameboy_t *gb, GB_channel_t channel);
uint16_t GB_get_channel_period(GB_gameboy_t *gb, GB_channel_t channel);
void GB_get_apu_wave_table(GB_gameboy_t *gb, uint8_t *wave_table);
bool GB_get_channel_edge_triggered(GB_gameboy_t *gb, GB_channel_t channel);
#ifdef GB_INTERNAL
internal bool GB_apu_is_DAC_enabled(GB_gameboy_t *gb, GB_channel_t index);
internal void GB_apu_write(GB_gameboy_t *gb, uint8_t reg, uint8_t value);