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Update user_fx usermod README.md (#4754)

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* turned into a fully fletched tutorial
This commit is contained in:
danewhero
2025-09-25 10:26:05 -04:00
committed by GitHub
parent daa833f33d
commit d5002cce25
2 changed files with 512 additions and 11 deletions
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21
usermods/user_fx/user_fx.cpp
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@@ -27,7 +27,7 @@ static uint16_t mode_diffusionfire(void) {
const uint8_t spark_rate = SEGMENT.intensity;
const uint8_t turbulence = SEGMENT.custom2;
unsigned dataSize = SEGMENT.length(); // allocate persistent data for heat value for each pixel
unsigned dataSize = cols * rows; // SEGLEN (virtual length) is equivalent to vWidth()*vHeight() for 2D
if (!SEGENV.allocateData(dataSize))
return mode_static(); // allocation failed
@@ -37,6 +37,7 @@ static uint16_t mode_diffusionfire(void) {
}
if ((strip.now - SEGENV.step) >= refresh_ms) {
// Keep for ≤~1 KiB; otherwise consider heap or reuse SEGENV.data as scratch.
uint8_t tmp_row[cols];
SEGENV.step = strip.now;
// scroll up
@@ -44,7 +45,7 @@ static uint16_t mode_diffusionfire(void) {
for (unsigned x = 0; x < cols; x++) {
unsigned src = XY(x, y);
unsigned dst = XY(x, y - 1);
SEGMENT.data[dst] = SEGMENT.data[src];
SEGENV.data[dst] = SEGENV.data[src];
}
if (hw_random8() > turbulence) {
@@ -53,7 +54,7 @@ static uint16_t mode_diffusionfire(void) {
uint8_t p = hw_random8();
if (p < spark_rate) {
unsigned dst = XY(x, rows - 1);
SEGMENT.data[dst] = 255;
SEGENV.data[dst] = 255;
}
}
}
@@ -61,24 +62,24 @@ static uint16_t mode_diffusionfire(void) {
// diffuse
for (unsigned y = 0; y < rows; y++) {
for (unsigned x = 0; x < cols; x++) {
unsigned v = SEGMENT.data[XY(x, y)];
unsigned v = SEGENV.data[XY(x, y)];
if (x > 0) {
v += SEGMENT.data[XY(x - 1, y)];
v += SEGENV.data[XY(x - 1, y)];
}
if (x < (cols - 1)) {
v += SEGMENT.data[XY(x + 1, y)];
v += SEGENV.data[XY(x + 1, y)];
}
tmp_row[x] = min(255, (int)(v * 100 / (300 + diffusion)));
}
for (unsigned x = 0; x < cols; x++) {
SEGMENT.data[XY(x, y)] = tmp_row[x];
SEGENV.data[XY(x, y)] = tmp_row[x];
if (SEGMENT.check1) {
uint32_t color = ColorFromPalette(SEGPALETTE, tmp_row[x], 255, LINEARBLEND_NOWRAP);
uint32_t color = SEGMENT.color_from_palette(tmp_row[x], true, false, 0);
SEGMENT.setPixelColorXY(x, y, color);
} else {
uint32_t color = SEGCOLOR(0);
SEGMENT.setPixelColorXY(x, y, color_fade(color, tmp_row[x]));
uint32_t base = SEGCOLOR(0);
SEGMENT.setPixelColorXY(x, y, color_fade(base, tmp_row[x]));
}
}
}