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memory optimization

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zeyus 2025-06-08 23:00:45 +02:00
parent 6d07be2015
commit c9b897d180
Signed by: zeyus
GPG key ID: A836639BA719C614
1 changed files with 44 additions and 16 deletions
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54
fluid_sim.cpp
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@ -252,27 +252,44 @@ void mpuActiveMonitorMode() {
struct GridCell {
uint8_t particles[10];
uint8_t count;
};
GridCell grid[GRID_SIZE][GRID_SIZE];
// Optimized spatial grid using single array + cell indices
uint8_t gridParticles[NUM_PARTICLES]; // All particles in grid order
uint16_t gridCellStart[GRID_SIZE * GRID_SIZE]; // Start index for each cell
uint8_t gridCellCount[GRID_SIZE * GRID_SIZE]; // Count for each cell
#ifdef DEBUG
bool blinkState = true;
#endif
void buildSpatialGrid() {
memset(grid, 0, sizeof(grid));
// Clear cell counts
memset(gridCellCount, 0, sizeof(gridCellCount));
// Count particles per cell
for(int i = 0; i < NUM_PARTICLES; i++) {
int gx = constrain(particles[i].x / CELL_SIZE, 0, GRID_SIZE-1);
int gy = constrain(particles[i].y / CELL_SIZE, 0, GRID_SIZE-1);
if(grid[gx][gy].count < 10) {
grid[gx][gy].particles[grid[gx][gy].count++] = i;
int cellIndex = gy * GRID_SIZE + gx;
gridCellCount[cellIndex]++;
}
// Calculate start indices (prefix sum)
gridCellStart[0] = 0;
for(int i = 1; i < GRID_SIZE * GRID_SIZE; i++) {
gridCellStart[i] = gridCellStart[i-1] + gridCellCount[i-1];
}
// Reset counts for filling
memset(gridCellCount, 0, sizeof(gridCellCount));
// Fill particle indices
for(int i = 0; i < NUM_PARTICLES; i++) {
int gx = constrain(particles[i].x / CELL_SIZE, 0, GRID_SIZE-1);
int gy = constrain(particles[i].y / CELL_SIZE, 0, GRID_SIZE-1);
int cellIndex = gy * GRID_SIZE + gx;
int insertPos = gridCellStart[cellIndex] + gridCellCount[cellIndex];
gridParticles[insertPos] = i;
gridCellCount[cellIndex]++;
}
}
@ -336,6 +353,10 @@ void setup() {
#endif
attachInterrupt(digitalPinToInterrupt(EXT0_PIN), DMPDataReady, FALLING);
MPUIntStatus = mpu.getIntStatus();
// Initialize sleep timer (start counting from device boot/wake)
lastZMot = millis();
zMotInterrupt = false;
// }
@ -380,9 +401,12 @@ void applyPhysics() {
if(gx+dx < 0 || gx+dx >= GRID_SIZE) continue;
if(gy+dy < 0 || gy+dy >= GRID_SIZE) continue;
GridCell &cell = grid[gx+dx][gy+dy];
for(int c=0; c<cell.count; c++) {
const int j = cell.particles[c];
int cellIndex = (gy+dy) * GRID_SIZE + (gx+dx);
int cellStart = gridCellStart[cellIndex];
int cellCount = gridCellCount[cellIndex];
for(int c = 0; c < cellCount; c++) {
const int j = gridParticles[cellStart + c];
if(j <= i) continue; // Avoid duplicate pairs
const float dx = particles[j].x - particles[i].x;
@ -507,6 +531,10 @@ void reportIMU() {
// Detect sudden changes (ignoring gravity component of ~16384)
float accelDelta = abs(accelMagnitude - lastAccelMagnitude);
maxAccelImpulse = max(maxAccelImpulse * 0.9f, accelDelta);
// Reset sleep timer on ANY motion/DMP data (device is active)
lastZMot = millis();
zMotInterrupt = false; // Clear zero motion flag since we have motion
}
}
else {