PS Fire: added sparks for better looks (wled#4714)

also added some smear-blurring if "smooth" (motion blur) is not used

Author: DedeHai

wled00/FX.cpp

@@ -8034,6 +8034,7 @@ uint16_t mode_particlefire(void) {
   PartSys->updateSystem(); // update system properties (dimensions and data pointers)
   PartSys->setWrapX(SEGMENT.check2);
   PartSys->setMotionBlur(SEGMENT.check1 * 170); // anable/disable motion blur
+  PartSys->setSmearBlur(!SEGMENT.check1 * 60);  // enable smear blur if motion blur is not enabled
 
   uint32_t firespeed = max((uint8_t)100, SEGMENT.speed); //limit speed to 100 minimum, reduce frame rate to make it slower (slower speeds than 100 do not look nice)
   if (SEGMENT.speed < 100) { //slow, limit FPS
@@ -8062,7 +8063,7 @@ uint16_t mode_particlefire(void) {
       PartSys->sources[i].source.ttl = 20 + hw_random16((SEGMENT.custom1 * SEGMENT.custom1) >> 8) / (1 + (firespeed >> 5)); //'hotness' of fire, faster flames reduce the effect or flame height will scale too much with speed
       PartSys->sources[i].maxLife = hw_random16(SEGMENT.virtualHeight() >> 1) + 16; // defines flame height together with the vy speed, vy speed*maxlife/PS_P_RADIUS is the average flame height
       PartSys->sources[i].minLife = PartSys->sources[i].maxLife >> 1;
-      PartSys->sources[i].vx = hw_random16(4) - 2; // emitting speed (sideways)
+      PartSys->sources[i].vx = hw_random16(5) - 2; // emitting speed (sideways)
       PartSys->sources[i].vy = (SEGMENT.virtualHeight() >> 1) + (firespeed >> 4) + (SEGMENT.custom1 >> 4); // emitting speed (upwards)
       PartSys->sources[i].var = 2 + hw_random16(2 + (firespeed >> 4)); // speed variation around vx,vy (+/- var)
     }
@@ -8089,6 +8090,20 @@ uint16_t mode_particlefire(void) {
     }
   }
 
+  // emit faster sparks at first flame position, amount and speed mostly dependends on intensity
+  if(hw_random8() < 10 + (SEGMENT.intensity >> 2)) {
+    for (i = 0; i < PartSys->usedParticles; i++) {
+      if (PartSys->particles[i].ttl == 0) { // find a dead particle
+        PartSys->particles[i].ttl = hw_random16(SEGMENT.virtualHeight()) + 30;
+        PartSys->particles[i].x = PartSys->sources[0].source.x;
+        PartSys->particles[i].y = PartSys->sources[0].source.y;
+        PartSys->particles[i].vx = PartSys->sources[0].source.vx;
+        PartSys->particles[i].vy = (SEGMENT.virtualHeight() >> 1) + (firespeed >> 4) + ((30 + (SEGMENT.intensity >> 1) + SEGMENT.custom1) >> 4); // emitting speed (upwards)
+        break; // emit only one particle
+      }
+    }
+  }
+
   uint8_t j = hw_random16(); // start with a random flame (so each flame gets the chance to emit a particle if available particles is smaller than number of flames)
   for (i = 0; i < percycle; i++) {
     j = (j + 1) % numFlames;