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2D Drift: minor optimization

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moving "t/20" out of the main loop gives some speedup.
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Frank 2023-07-21 16:09:01 +02:00 committed by GitHub
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commit 1ecb4fedcc
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1 changed files with 2 additions and 1 deletions
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wled00/FX.cpp
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@ -4759,11 +4759,12 @@ uint16_t mode_2DDrift() { // By: Stepko https://editor.soulmateli
const uint16_t maxDim = MAX(cols, rows)/2; const uint16_t maxDim = MAX(cols, rows)/2;
unsigned long t = millis() / (32 - (SEGMENT.speed>>3)); unsigned long t = millis() / (32 - (SEGMENT.speed>>3));
unsigned long t_20 = t/20; // softhack007: pre-calculating this gives about 10% speedup
for (float i = 1; i < maxDim; i += 0.25) { for (float i = 1; i < maxDim; i += 0.25) {
float angle = radians(t * (maxDim - i)); float angle = radians(t * (maxDim - i));
uint16_t myX = (cols>>1) + (uint16_t)(sin_t(angle) * i) + (cols%2); uint16_t myX = (cols>>1) + (uint16_t)(sin_t(angle) * i) + (cols%2);
uint16_t myY = (rows>>1) + (uint16_t)(cos_t(angle) * i) + (rows%2); uint16_t myY = (rows>>1) + (uint16_t)(cos_t(angle) * i) + (rows%2);
SEGMENT.setPixelColorXY(myX, myY, ColorFromPalette(SEGPALETTE, (i * 20) + (t / 20), 255, LINEARBLEND)); SEGMENT.setPixelColorXY(myX, myY, ColorFromPalette(SEGPALETTE, (i * 20) + t_20, 255, LINEARBLEND));
} }
SEGMENT.blur(SEGMENT.intensity>>3); SEGMENT.blur(SEGMENT.intensity>>3);