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Optimization: instant wires

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Dejvino 2026-03-01 17:03:20 +01:00
parent 6fe8488994
commit fbf1b36652
2 changed files with 105 additions and 81 deletions
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176
synth_engine.cpp
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@ -4,20 +4,48 @@
#include <string.h>
// A simple sine lookup table for the sine oscillator
const int SINE_TABLE_SIZE = 256;
static int16_t sine_table[SINE_TABLE_SIZE];
static bool sine_table_filled = false;
const int WAVE_TABLE_SIZE = 256;
const int NUM_WAVEFORMS = 8;
static int16_t wave_tables[NUM_WAVEFORMS][WAVE_TABLE_SIZE];
static bool wave_tables_filled = false;
/**
* @brief Fills the global sine table. Called once on startup.
* @brief Fills the global wave tables. Called once on startup.
*/
void fill_sine_table() {
if (sine_table_filled) return;
for (int i = 0; i < SINE_TABLE_SIZE; ++i) {
// M_PI is not standard C++, but it's common. If it fails, use 3.1415926535...
sine_table[i] = static_cast<int16_t>(sin(2.0 * M_PI * i / SINE_TABLE_SIZE) * 32767.0);
void fill_wave_tables() {
if (wave_tables_filled) return;
for (int i = 0; i < WAVE_TABLE_SIZE; ++i) {
double phase = (double)i / (double)WAVE_TABLE_SIZE;
double pi2 = 2.0 * M_PI;
// 0: Sine
wave_tables[0][i] = (int16_t)(sin(pi2 * phase) * 32767.0);
// 1: Sawtooth (Rising)
wave_tables[1][i] = (int16_t)((2.0 * phase - 1.0) * 32767.0);
// 2: Square
wave_tables[2][i] = (int16_t)((phase < 0.5 ? 1.0 : -1.0) * 32767.0);
// 3: Triangle
double tri = (phase < 0.5) ? (4.0 * phase - 1.0) : (3.0 - 4.0 * phase);
wave_tables[3][i] = (int16_t)(tri * 32767.0);
// 4: Ramp (Falling Saw)
wave_tables[4][i] = (int16_t)((1.0 - 2.0 * phase) * 32767.0);
// 5: Pulse 25%
wave_tables[5][i] = (int16_t)((phase < 0.25 ? 1.0 : -1.0) * 32767.0);
// 6: Distorted Sine
double d = sin(pi2 * phase) + 0.3 * sin(2.0 * pi2 * phase);
wave_tables[6][i] = (int16_t)((d / 1.3) * 32767.0);
// 7: Organ
double o = 0.6 * sin(pi2 * phase) + 0.2 * sin(2.0 * pi2 * phase) + 0.1 * sin(4.0 * pi2 * phase);
wave_tables[7][i] = (int16_t)((o / 0.9) * 32767.0);
}
sine_table_filled = true;
wave_tables_filled = true;
}
SynthEngine::SynthEngine(uint32_t sampleRate)
@ -31,7 +59,7 @@ SynthEngine::SynthEngine(uint32_t sampleRate)
_freqToPhaseInc(0.0f),
_rngState(12345)
{
fill_sine_table();
fill_wave_tables();
// Initialize with a default frequency
setFrequency(440.0f);
@ -295,6 +323,7 @@ void SynthEngine::rebuildProcessingOrder_locked() {
// Start BFS from the SINK backwards
q.push_back({GRID_W / 2, GRID_H - 1});
visited[GRID_W / 2][GRID_H - 1] = true;
_processing_order.push_back({GRID_W / 2, GRID_H - 1});
int head = 0;
while(head < (int)q.size()) {
@ -335,12 +364,13 @@ void SynthEngine::rebuildProcessingOrder_locked() {
if (pointsToCurr) {
visited[tx][ty] = true;
q.push_back({tx, ty});
if (grid[tx][ty].type != GridCell::WIRE) {
_processing_order.push_back({tx, ty});
}
}
}
}
}
_processing_order = q;
}
void SynthEngine::rebuildProcessingOrder() {
@ -352,45 +382,45 @@ void SynthEngine::updateGraph() {
rebuildProcessingOrder_locked();
}
int32_t SynthEngine::processGridStep() {
bool SynthEngine::isConnected(int tx, int ty, int from_x, int from_y) {
if (from_x < 0 || from_x >= GRID_W || from_y < 0 || from_y >= GRID_H) return false;
GridCell& n = grid[from_x][from_y];
auto isConnected = [&](int tx, int ty, int from_x, int from_y) -> bool {
if (from_x < 0 || from_x >= GRID_W || from_y < 0 || from_y >= GRID_H) return false;
GridCell& n = grid[from_x][from_y];
bool connects = false;
if (n.type == GridCell::WIRE || n.type == GridCell::FIXED_OSCILLATOR || n.type == GridCell::INPUT_OSCILLATOR || n.type == GridCell::WAVETABLE || n.type == GridCell::NOISE || n.type == GridCell::LFO || n.type == GridCell::GATE_INPUT || n.type == GridCell::ADSR_ATTACK || n.type == GridCell::ADSR_DECAY || n.type == GridCell::ADSR_SUSTAIN || n.type == GridCell::ADSR_RELEASE || n.type == GridCell::LPF || n.type == GridCell::HPF || n.type == GridCell::VCA || n.type == GridCell::BITCRUSHER || n.type == GridCell::DISTORTION || n.type == GridCell::RECTIFIER || n.type == GridCell::PITCH_SHIFTER || n.type == GridCell::GLITCH || n.type == GridCell::OPERATOR || n.type == GridCell::DELAY || n.type == GridCell::REVERB) {
// Check rotation
// 0:N (y-1), 1:E (x+1), 2:S (y+1), 3:W (x-1)
if (n.rotation == 0 && from_y - 1 == ty && from_x == tx) connects = true;
if (n.rotation == 1 && from_x + 1 == tx && from_y == ty) connects = true;
if (n.rotation == 2 && from_y + 1 == ty && from_x == tx) connects = true;
if (n.rotation == 3 && from_x - 1 == tx && from_y == ty) connects = true;
} else if (n.type == GridCell::FORK) {
// Fork outputs to Left (rot+3) and Right (rot+1) relative to its rotation
// n.rotation is "Forward"
int dx = tx - from_x;
int dy = ty - from_y;
int dir = -1;
if (dx == 0 && dy == -1) dir = 0; // N
if (dx == 1 && dy == 0) dir = 1; // E
if (dx == 0 && dy == 1) dir = 2; // S
if (dx == -1 && dy == 0) dir = 3; // W
bool connects = false;
if (n.type == GridCell::WIRE || n.type == GridCell::FIXED_OSCILLATOR || n.type == GridCell::INPUT_OSCILLATOR || n.type == GridCell::WAVETABLE || n.type == GridCell::NOISE || n.type == GridCell::LFO || n.type == GridCell::GATE_INPUT || n.type == GridCell::ADSR_ATTACK || n.type == GridCell::ADSR_DECAY || n.type == GridCell::ADSR_SUSTAIN || n.type == GridCell::ADSR_RELEASE || n.type == GridCell::LPF || n.type == GridCell::HPF || n.type == GridCell::VCA || n.type == GridCell::BITCRUSHER || n.type == GridCell::DISTORTION || n.type == GridCell::RECTIFIER || n.type == GridCell::PITCH_SHIFTER || n.type == GridCell::GLITCH || n.type == GridCell::OPERATOR || n.type == GridCell::DELAY || n.type == GridCell::REVERB) {
// Check rotation
// 0:N (y-1), 1:E (x+1), 2:S (y+1), 3:W (x-1)
if (n.rotation == 0 && from_y - 1 == ty && from_x == tx) connects = true;
if (n.rotation == 1 && from_x + 1 == tx && from_y == ty) connects = true;
if (n.rotation == 2 && from_y + 1 == ty && from_x == tx) connects = true;
if (n.rotation == 3 && from_x - 1 == tx && from_y == ty) connects = true;
} else if (n.type == GridCell::FORK) {
// Fork outputs to Left (rot+3) and Right (rot+1) relative to its rotation
// n.rotation is "Forward"
int dx = tx - from_x;
int dy = ty - from_y;
int dir = -1;
if (dx == 0 && dy == -1) dir = 0; // N
if (dx == 1 && dy == 0) dir = 1; // E
if (dx == 0 && dy == 1) dir = 2; // S
if (dx == -1 && dy == 0) dir = 3; // W
int leftOut = (n.rotation + 3) % 4;
int rightOut = (n.rotation + 1) % 4;
int leftOut = (n.rotation + 3) % 4;
int rightOut = (n.rotation + 1) % 4;
if (dir == leftOut || dir == rightOut) connects = true;
}
return connects;
}
if (dir == leftOut || dir == rightOut) connects = true;
}
return connects;
};
int32_t SynthEngine::getInput(int tx, int ty, int from_x, int from_y, int depth) {
if (depth > 16) return 0; // Prevent infinite loops
if (!isConnected(tx, ty, from_x, from_y)) return 0;
GridCell& n = grid[from_x][from_y];
// Helper to get input from a neighbor
auto getInput = [&](int tx, int ty, int from_x, int from_y) -> int32_t {
if (!isConnected(tx, ty, from_x, from_y)) return 0;
GridCell& n = grid[from_x][from_y];
if (n.type == GridCell::FORK) {
if (n.type == GridCell::WIRE) {
return getSummedInput(from_x, from_y, n, depth + 1);
} else if (n.type == GridCell::FORK) {
int dx = tx - from_x;
int dy = ty - from_y;
int dir = -1;
@ -404,21 +434,22 @@ int32_t SynthEngine::processGridStep() {
if (dir == leftOut) return (n.value * (FP_ONE - n.param)) >> (FP_SHIFT - 1);
if (dir == rightOut) return (n.value * n.param) >> (FP_SHIFT - 1);
}
}
return n.value;
};
return n.value;
}
// Helper to sum inputs excluding the output direction
auto getSummedInput = [&](int x, int y, GridCell& c) -> int32_t {
int32_t sum = 0;
int outDir = c.rotation; // 0:N, 1:E, 2:S, 3:W
if (outDir != 0) sum += getInput(x, y, x, y-1);
if (outDir != 1) sum += getInput(x, y, x+1, y);
if (outDir != 2) sum += getInput(x, y, x, y+1);
if (outDir != 3) sum += getInput(x, y, x-1, y);
return sum;
};
int32_t SynthEngine::getSummedInput(int x, int y, GridCell& c, int depth) {
int32_t sum = 0;
int outDir = c.rotation; // 0:N, 1:E, 2:S, 3:W
if (outDir != 0) sum += getInput(x, y, x, y-1, depth);
if (outDir != 1) sum += getInput(x, y, x+1, y, depth);
if (outDir != 2) sum += getInput(x, y, x, y+1, depth);
if (outDir != 3) sum += getInput(x, y, x-1, y, depth);
return sum;
}
int32_t SynthEngine::processGridStep() {
auto getInputFromTheBack = [&](int x, int y, GridCell& c) -> int32_t {
int inDir = (c.rotation + 2) % 4;
@ -462,7 +493,7 @@ int32_t SynthEngine::processGridStep() {
uint32_t inc = freq * 97391;
c.phase_accumulator += inc;
// Top 8 bits of 32-bit accumulator form the 256-entry table index
val = sine_table[c.phase_accumulator >> 24];
val = wave_tables[0][c.phase_accumulator >> 24];
val = (val * getSideInputGain(x, y, c)) >> FP_SHIFT;
} else if (c.type == GridCell::INPUT_OSCILLATOR) {
int32_t mod = getInputFromTheBack(x, y, c);
@ -478,7 +509,7 @@ int32_t SynthEngine::processGridStep() {
inc += (int32_t)(((int64_t)mod * 500 * 97391) >> FP_SHIFT);
c.phase_accumulator += inc;
val = sine_table[c.phase_accumulator >> 24];
val = wave_tables[0][c.phase_accumulator >> 24];
val = (val * getSideInputGain(x, y, c)) >> FP_SHIFT;
} else if (c.type == GridCell::WAVETABLE) {
int32_t mod = getInputFromTheBack(x, y, c);
@ -488,19 +519,8 @@ int32_t SynthEngine::processGridStep() {
c.phase_accumulator += inc;
int wave_select = (c.param * 8) >> FP_SHIFT;
bool phase_upper = (c.phase_accumulator & 0x80000000);
switch(wave_select) {
case 0: val = sine_table[c.phase_accumulator >> 24]; break;
case 1: val = (int32_t)((c.phase_accumulator >> 16) & 0xFFFF) - 32768; break; // Saw
case 2: val = phase_upper ? -32767 : 32767; break; // Square
case 3: val = sine_table[c.phase_accumulator >> 24]; break; // Triangle (fallback)
case 4: val = 32767 - (int32_t)((c.phase_accumulator >> 16) & 0xFFFF); break; // Ramp
case 5: val = ((c.phase_accumulator >> 30) == 0) ? 32767 : -32767; break; // Pulse 25%
default:
val = sine_table[c.phase_accumulator >> 24];
break;
}
if (wave_select > 7) wave_select = 7;
val = wave_tables[wave_select][c.phase_accumulator >> 24];
val = (val * getSideInputGain(x, y, c)) >> FP_SHIFT;
} else if (c.type == GridCell::NOISE) {
int32_t mod = getInputFromTheBack(x, y, c);
@ -538,7 +558,7 @@ int32_t SynthEngine::processGridStep() {
uint32_t inc = freq_x10 * 9739;
c.phase_accumulator += inc;
// Output full range -1.0 to 1.0
val = sine_table[c.phase_accumulator >> 24];
val = wave_tables[0][c.phase_accumulator >> 24];
} else if (c.type == GridCell::FORK) {
// Sum inputs from "Back" (Input direction)
val = getInputFromTheBack(x, y, c);
@ -573,7 +593,7 @@ int32_t SynthEngine::processGridStep() {
val = (in * c.param) >> FP_SHIFT;
} else if (c.type == GridCell::WIRE) {
// Sum inputs from all neighbors that point to me
val = getSummedInput(x, y, c);
val = getSummedInput(x, y, c, 0);
} else if (c.type == GridCell::LPF) {
// Input from Back
int32_t in = getInputFromTheBack(x, y, c);
@ -599,7 +619,7 @@ int32_t SynthEngine::processGridStep() {
int32_t in = getInputFromTheBack(x, y, c);
// Mod from other directions (sum)
int32_t mod = getSummedInput(x, y, c);
int32_t mod = getSummedInput(x, y, c, 0);
mod -= in; // Remove signal input from mod sum (it was included in getInput calls)
// Gain = Param + Mod

4
synth_engine.h
View File

@ -146,6 +146,10 @@ private:
std::vector<std::pair<int, int>> _processing_order;
void rebuildProcessingOrder_locked();
bool isConnected(int tx, int ty, int from_x, int from_y);
int32_t getInput(int tx, int ty, int from_x, int from_y, int depth = 0);
int32_t getSummedInput(int x, int y, GridCell& c, int depth = 0);
// Internal random number generator
int32_t _random();
};