#include "FastLED.h"
// originally by ldir
// rotzoom and supersampling added by sutaburosu
// Matrix size
#define NUM_ROWS 20
#define NUM_COLS 32
// LEDs pin
#define DATA_PIN 3
// LED brightness
#define BRIGHTNESS 255
#define NUM_LEDS ((NUM_ROWS) * (NUM_COLS))
// Define the array of leds
CRGB leds[NUM_LEDS];
#define FISH_SPR_SIZE 18
#define TILE_SIZE 32
const uint32_t fish [FISH_SPR_SIZE * FISH_SPR_SIZE] PROGMEM = { //prepare image with LCD Image Converter
0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x509ee6, 0x8abcff, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000,
0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x569ce1, 0x84c1f7, 0x5d9bd8, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000,
0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x55a4e7, 0x7fbffd, 0x5a9fda, 0x80befb, 0x57a4e8, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000,
0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x579ce1, 0x84c1f8, 0x569ce1, 0x84bff9, 0x579ce1, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000,
0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x579de3, 0x84c0f6, 0x549de2, 0x84c1f8, 0x579be4, 0x84bff7, 0x000000, 0x000000, 0x000000, 0x5b9fe6, 0x569ce1, 0x579ce1,
0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x5069ea, 0x4f6cee, 0x516ced, 0x569be0, 0x87bffa, 0x559cde, 0x85c2fb, 0x000000, 0x000000, 0x559ee3, 0x85c0f8, 0x85bef5, 0x000000,
0x000000, 0x000000, 0x000000, 0x576be8, 0x516cef, 0x4f6cee, 0x546de1, 0x506def, 0x536ceb, 0x536bf1, 0x536bf1, 0x000000, 0x000000, 0x589ce3, 0x569bde, 0x579be2, 0x579be2, 0x000000,
0x000000, 0x7bc6fd, 0x80c0fd, 0x8bbcff, 0x516cef, 0x506def, 0x536ced, 0x506def, 0x4f6cee, 0x516ced, 0x506def, 0x556cee, 0x546bef, 0x87bff8, 0x87c0f5, 0x87c0f5, 0x000000, 0x000000,
0x89c0f6, 0x89bef2, 0x32352e, 0x8bbcfe, 0x8bbdfc, 0x516cef, 0x506def, 0x5773f1, 0x506bee, 0x526df0, 0x4f6cee, 0x536bef, 0x506bee, 0x516eee, 0x569bde, 0x579ade, 0x000000, 0x000000,
0x88c0f3, 0x86c1fb, 0x2b323a, 0x80c2ff, 0x83c0f6, 0x516ced, 0x4e6be3, 0x516cef, 0x4f6def, 0x516aeb, 0x526df2, 0x506def, 0x516eee, 0x516de8, 0x569ddf, 0x549edf, 0x000000, 0x000000,
0x88c1f6, 0x84bff9, 0x85c1f7, 0x86befb, 0x84c0fc, 0x5370f0, 0x516cef, 0x4f6cee, 0x516cef, 0x516bf3, 0x4f6cee, 0x526af0, 0x516ef0, 0x84bff7, 0x88bff8, 0x85c0f8, 0x000000, 0x000000,
0x000000, 0x84c0fc, 0x87bef7, 0x87c0f5, 0x586beb, 0x506bee, 0x506cf1, 0x516ced, 0x536bef, 0x516cef, 0x516feb, 0x579ce1, 0x000000, 0x569ae1, 0x579ce1, 0x539edf, 0x579cdf, 0x000000,
0x000000, 0x000000, 0x000000, 0x556be5, 0x516cef, 0x506def, 0x516cef, 0x536bef, 0x000000, 0x000000, 0x579ce1, 0x83c0f9, 0x000000, 0x000000, 0x569ce4, 0x84c1fa, 0x84c1f8, 0x85c0f8,
0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x549de1, 0x85c0f8, 0x569ce2, 0x000000, 0x000000, 0x579cdd, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000,
0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x569ae1, 0x85c0fa, 0x569ce4, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000,
0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x92cbff, 0x73b0ef, 0x68ace9, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000,
0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x539ee2, 0x85c2f8, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000,
0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x579be2, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000
};
void setup() {
FastLED.addLeds<NEOPIXEL, DATA_PIN>(leds, NUM_LEDS);
FastLED.setBrightness(BRIGHTNESS);
}
const uint8_t wu_weight(uint8_t a, uint8_t b) {
return ((uint16_t) a * b + a + b) >> 8;
}
void loop() {
uint32_t ms = millis();
// https://wikipedia.org/wiki/Rotation_matrix
int32_t xdx = cos16(ms * 3);
int32_t ydx = sin16(ms * 3);
int32_t xdy = -sin16(ms * 3);
int32_t ydy = cos16(ms * 3);
if (1) { // zoom too
xdx = (cos(ms / 3000.f) * (sin(ms / 1900.f) / 2.5f + .7f)) * 65535.f * 2.f;
xdy = (sin(ms / 3000.f) * (sin(ms / 1900.f) / 2.5f + .7f)) * 65535.f * 2.f;
ydx = (-sin(ms / 3000.f) * (sin(ms / 1900.f) / 2.5f + .7f)) * 65535.f * 2.f;
ydy = (cos(ms / 3000.f) * (sin(ms / 1900.f) / 2.5f + .7f)) * 65535.f * 2.f;
}
// move the centre of rotation
uint32_t xstart = -xdx * (NUM_COLS + 1) / 2;
uint32_t ystart = -ydx * (NUM_ROWS + 1) / 2;
xstart -= xdy * (NUM_COLS + 1) / 2;
ystart -= ydy * (NUM_ROWS + 1) / 2;
for (byte row = 0; row < NUM_ROWS; row++) {
uint32_t x = xstart;
uint32_t y = ystart;
for (byte column = 0; column < NUM_COLS; column++) {
CRGB output = 0;
if ((millis() / 2048) & 0) {
// non super-sampled
uint8_t xoffset = ((x >> 15) + (ms >> 5));
uint8_t yoffset = y >> 15;
// tile the SPR_SIZExSPR_SIZE sprite on a 32x32 grid
xoffset %= TILE_SIZE;
yoffset %= TILE_SIZE;
// sample 1 pixel from the texture
if (xoffset < FISH_SPR_SIZE && yoffset < FISH_SPR_SIZE)
output = pgm_read_dword(fish + xoffset + yoffset * FISH_SPR_SIZE);
} else {
// super-sampled (the values are 256x bigger, so the bottom 8-bits are the fractional part)
uint16_t xoffset = (x >> 8) + (ms << 3);
uint16_t yoffset = y >> 8;
// extract the fractional parts and derive their inverses
uint8_t xx = xoffset & 0xff, yy = yoffset & 0xff, ix = 255 - xx, iy = 255 - yy;
// co-ordinates of the 4 texture samples
// this works OK when scaling up the source texture
// but is incorrect when scaling down. much aliasing.
uint8_t x0 = (xoffset >> 8) % TILE_SIZE;
uint8_t y0 = (yoffset >> 8) % TILE_SIZE;
uint8_t x1 = (x0 + 1) % TILE_SIZE;
uint8_t y1 = (y0 + 1) % TILE_SIZE;
// sample 4 texture pixels, scaling them by the Wu weight of the fractional offset
// keep tiling the 18x18 texture lookups on a 32x32 grid
if (x0 < FISH_SPR_SIZE) {
if (y0 < FISH_SPR_SIZE) {
CRGB sample = pgm_read_dword_near(fish + x0 + y0 * FISH_SPR_SIZE);
output.r = (sample.r * wu_weight(ix, iy)) >> 8;
output.g = (sample.g * wu_weight(ix, iy)) >> 8;
output.b = (sample.b * wu_weight(ix, iy)) >> 8;
}
if (y1 < FISH_SPR_SIZE) {
CRGB sample = pgm_read_dword_near(fish + x0 + y1 * FISH_SPR_SIZE);
output.r += (sample.r * wu_weight(ix, yy)) >> 8;
output.g += (sample.g * wu_weight(ix, yy)) >> 8;
output.b += (sample.b * wu_weight(ix, yy)) >> 8;
}
}
if (x1 < FISH_SPR_SIZE) {
if (y0 < FISH_SPR_SIZE) {
CRGB sample = pgm_read_dword_near(fish + x1 + y0 * FISH_SPR_SIZE);
output.r += (sample.r * wu_weight(xx, iy)) >> 8;
output.g += (sample.g * wu_weight(xx, iy)) >> 8;
output.b += (sample.b * wu_weight(xx, iy)) >> 8;
}
if (y1 < FISH_SPR_SIZE) {
CRGB sample = pgm_read_dword_near(fish + x1 + y1 * FISH_SPR_SIZE);
output.r += (sample.r * wu_weight(xx, yy)) >> 8;
output.g += (sample.g * wu_weight(xx, yy)) >> 8;
output.b += (sample.b * wu_weight(xx, yy)) >> 8;
}
}
}
leds[XY(column, row)] = output;
x += xdx;
y += ydx;
}
xstart += xdy;
ystart += ydy;
}
FastLED.show();
} //loop
uint16_t XY (uint8_t x, uint8_t y) {
return (y * NUM_COLS + x);
}