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3D works but needs finetuning to match old looks

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This commit is contained in:
Damian Schneider 2025-03-07 06:39:49 +01:00
parent 9553425374
commit 5e8073022b
2 changed files with 21 additions and 28 deletions
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31
wled00/util.cpp
View File

@ -653,34 +653,27 @@ static inline __attribute__((always_inline)) int32_t gradient2D(uint32_t x0, int
}
static inline __attribute__((always_inline)) int32_t gradient3D(uint32_t x0, int32_t dx, uint32_t y0, int32_t dy, uint32_t z0, int32_t dz) {
//uint32_t hash = perlinHash(x0 ^ perlinHash(y0 ^ perlinHash(z0)));
// fast and good entropy hash from corner coordinates
uint32_t hash = x0 * 0x68E31DA4 + y0 * 0xB5297A4D + z0 * 0x1B56C4E9;
hash ^= hash >> 8;
hash += hash << 3;
hash ^= hash >> 16;
// calculate gradients for each corner from hash value
//int32_t gradx = (hash & 0x07) - 4; // +3 to -4
//int32_t grady = ((hash>>3) & 0x07) - 4;
//int32_t gradz = ((hash>>6) & 0x07) - 4;
// fast and good entropy hash from corner coordinates
uint32_t h = (x0 * 0x68E31DA4) ^ (y0 * 0xB5297A4D) ^ (z0 * 0x1B56C4E9);
h ^= h >> 15;
h = h * 0x92C3412B + (h >> 13);
int32_t gradx = (hash & 0xFF) - 128; // +127 to -128
int32_t grady = ((hash>>7) & 0xFF) - 128;
int32_t gradz = ((hash>>14) & 0xFF) - 128;
return (gradx * dx + grady * dy + gradz * dz) >> 10;
int32_t gradx = (h & 0xFF) - 128; // +127 to -128
int32_t grady = ((h>>7) & 0xFF) - 128;
int32_t gradz = ((h>>14) & 0xFF) - 128;
return (gradx * dx + grady * dy + gradz * dz) >> 8; // 25bit >> 8bit -> result is signed 17bit max
}
// fast cubic smoothstep: t*(3 - 2t²), optimized for fixed point
// fast cubic smoothstep: t*(3 - 2t²), optimized for fixed point, scaled to avoid overflows
static uint32_t smoothstep(const uint32_t t) {
uint32_t t_squared = (t * t) >> 16;
uint32_t factor = (3 << 16) - ((t << 1));
return (t_squared * factor) >> 16;
return (t_squared * factor) >> 19;
}
// simple linear interpolation for fixed-point values, scaled for perlin noise use
static inline int32_t lerpPerlin(int32_t a, int32_t b, int32_t t) {
return a + (((b - a) * t) >> 16);
return a + (((b - a) * t) >> 13);
}
// 1D Perlin noise function that returns a value in range of approximately -32768 to +32768
@ -786,5 +779,5 @@ uint16_t perlin16(uint32_t x, uint32_t y) {
}
uint16_t perlin16(uint32_t x, uint32_t y, uint32_t z) {
return (perlin3D_raw(x, y, z)>>1) + 0x7FFF;
return perlin3D_raw(x, y, z) + 0x7FFF; // scale to signed 16bit range and offset
}

18
wled00/wled.cpp
View File

@ -345,18 +345,18 @@ void WLED::setup()
uint32_t end;
uint32_t time;
uint8_t offset = hw_random();
/*
for(int i = 0; i < 0xFFFFF; i+=800) {
for(int i = 0; i < 0xFFFFF; i+=500) {
Serial.print(inoise16(i, offset, (offset >> 3))); Serial.print(","); //x
Serial.print(inoise16(offset, i, (offset >> 3))); Serial.print(","); //y
Serial.print(inoise16(offset, (offset >> 3), i)); Serial.print(","); //z
Serial.print(perlin16(i, offset, (offset >> 3))); Serial.print(","); //x
Serial.print(perlin16(offset, i, (offset >> 3))); Serial.print(","); //y
Serial.print(perlin16(offset, (offset >> 3), i)); Serial.print(","); //z
Serial.print(inoise16(i, offset+i/4, i*2 + (offset >> 3))); Serial.print(","); //mixed mode
Serial.print(perlin16(i, offset+i/4, i*2 + (offset >> 3))); Serial.print(",");
Serial.print(inoise16(i, offset+i/2, i + (offset >> 3))); Serial.print(","); //mixed mode
Serial.print(perlin16(i, offset+i/2, i + (offset >> 3))); Serial.print(",");
Serial.println(perlin3D_raw(i, offset+i/4, i*2 + (offset >> 3))); //raw
}*/
}
/*
for(int i = 0; i < 0x2FFFF; i+=100) {
@ -419,7 +419,7 @@ void WLED::setup()
minval=0xFFFFF;
maxval=0;
start = micros();
for(int i = 0; i < 0xFFFFFFF; i+=5) {
for(int i = 0; i < 0xFFFFFFF; i+=50) {
uint32_t pos = i + offset;
//int32_t noiseval = perlin16(hw_random());
int32_t noiseval = perlin1D_raw(hw_random());
@ -433,7 +433,7 @@ Serial.print(" perlin1D raw min: "); Serial.print(minval); Serial.print(" max: "
minval=0xFFFFF;
maxval=0;
start = micros();
for(int i = 0; i < 0xFFFFFFF; i+=5) {
for(int i = 0; i < 0xFFFFFFF; i+=50) {
uint32_t pos = i + offset;
//int32_t noiseval = perlin16( hw_random(), hw_random());
int32_t noiseval = perlin2D_raw( hw_random(), hw_random());
@ -448,7 +448,7 @@ Serial.print(" perlin1D raw min: "); Serial.print(minval); Serial.print(" max: "
minval=0xFFFFF;
maxval=0;
for(int i = 0; i < 0xFFFFFFF; i+=5) {
for(int i = 0; i < 0xFFFFFFF; i+=50) {
uint32_t pos = i + offset;
//int32_t noiseval = perlin3D_raw(pos, pos+46845, pos+654684);
//int32_t noiseval = perlin3D_raw(hw_random(), hw_random(), hw_random());
@ -463,7 +463,7 @@ Serial.print(" perlin1D raw min: "); Serial.print(minval); Serial.print(" max: "
minval=0xFFFFF;
maxval=0;
for(int i = 0; i < 0xFFFFFFF; i+=5) {
for(int i = 0; i < 0xFFFFFFF; i+=50) {
uint32_t pos = i + offset;
//int32_t noiseval = perlin3D_raw(pos, pos+46845, pos+654684);
int32_t noiseval = perlin3D_raw(hw_random(), hw_random(), hw_random());