BlurBenchmark.ino

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// @filter: (mem is large)
// Gaussian blur AVR benchmark — run in avr8js emulator.
// Exercises blurGaussian<R,R> on an 8x8 CRGB matrix and prints
// microseconds per iteration over Serial.
 
#include <FastLED.h>
 
#define WIDTH 8
#define HEIGHT 8
#define NUM_LEDS (WIDTH * HEIGHT)
#define ITERS 100
 
CRGB leds[NUM_LEDS];
 
static void fill_test_data() {
    for (int i = 0; i < NUM_LEDS; i++) {
        leds[i] = CRGB(i * 37 + 17, i * 59 + 31, i * 83 + 47);
    }
}
 
template <int hR, int vR>
static void bench(const char *label) {
    fl::gfx::Canvas<CRGB> canvas(fl::span<CRGB>(leds, NUM_LEDS), WIDTH, HEIGHT);
 
    // Warmup
    fill_test_data();
    fl::gfx::blurGaussian<hR, vR>(canvas);
 
    // Timed run
    fill_test_data();
    unsigned long t0 = micros();
    for (int i = 0; i < ITERS; i++) {
        fl::gfx::blurGaussian<hR, vR>(canvas);
    }
    unsigned long elapsed = micros() - t0;
 
    Serial.print(label);
    Serial.print(": ");
    Serial.print(elapsed / ITERS);
    Serial.println(" us/iter");
}
 
void setup() {
    Serial.begin(115200);
    delay(100);
 
    Serial.println("== Gaussian Blur AVR Benchmark (8x8) ==");
 
    bench<1, 1>("R1 (3x3)");
    bench<2, 2>("R2 (5x5)");
    bench<3, 3>("R3 (7x7)");
    bench<4, 4>("R4 (9x9)");
 
    Serial.println("== Done ==");
}
 
void loop() {
    delay(1000);
    Serial.println("Test loop!");
}