46 lines
1.7 KiB
C
46 lines
1.7 KiB
C
#include "const.h"
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#include "input.h"
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#include "state.h"
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float quantize(float freq) {
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if (freq <= 0.0f) return 0.0f;
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float midi = 69.0f + 12.0f * log2f(freq / 440.0f);
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return 440.0f * powf(2.0f, (roundf(midi) - 69.0f) / 12.0f);
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}
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void update_state(state_t* state, input_t* input) {
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state->vco_freq = map_exponential(input->pots[0], VCO_FREQ_MIN, VCO_FREQ_MAX);
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state->vco_volume = map_exponential(input->pots[1], VCO_VOLUME_MIN, VCO_VOLUME_MAX);
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state->filter_freq = map_exponential(input->pots[2], FILTER_FREQ_MIN, FILTER_FREQ_MAX);
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state->filter_resonance = map_linear(input->pots[3], FILTER_RES_MIN, FILTER_RES_MAX);
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state->clock_bpm = map_linear(input->pots[4], BPM_MIN, BPM_MAX);
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state->env1_attack = map_linear(input->pots[5], ENV_ATTACK_MIN, ENV_ATTACK_MAX);
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state->env1_decay = map_linear(input->pots[6], ENV_RELEASE_MIN, ENV_RELEASE_MAX);
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state->env2_attack = map_linear(input->pots[7], ENV_ATTACK_MIN, ENV_ATTACK_MAX);
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state->env2_decay = map_linear(input->pots[8], ENV_RELEASE_MIN, ENV_RELEASE_MAX);
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state->reverb_amount = map_linear(input->pots[9], REVERB_AMOUNT_MIN, REVERB_AMOUNT_MAX);
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static bool pressed = false;
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if (!pressed && input->buttons[0]) {
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state->vco_mode = (vco_mode_t)((state->vco_mode + 1) % 4);
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pressed = true;
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} else pressed = false;
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if (input->buttons[1]) {
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if (state->vco_freq <= 0.0f) state->vco_freq = 0.0f;
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else state->vco_freq = quantize(state->vco_freq);
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}
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// state->amen_enabled = input->buttons[2];
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state->amen_enabled = true;
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state->beat_samples = SAMPLE_RATE * 60.0f / state->clock_bpm;
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state->playback_rate = state->clock_bpm / AMEN_BPM;
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state->clock_inc = state->clock_bpm / 60.0f / SAMPLE_RATE;
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state->amen_inc_fp = (uint32_t)(state->playback_rate * 65536.0f);
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}
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