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fix particle brightness distribution with new gamma correction (#4710)

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Particle System depends on linear brightness distribution, gamma corrected values are non-linear.
- added invers gamma table
- reversing gamma after brightness distribution makes it linear once again
This commit is contained in:
Damian Schneider
2025-06-07 13:15:45 +02:00
committed by GitHub
parent a87b562bc2
commit 8b65d873b3
5 changed files with 28 additions and 6 deletions
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5
wled00/fcn_declare.h
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@@ -158,13 +158,16 @@ class NeoGammaWLEDMethod {
public:
[[gnu::hot]] static uint8_t Correct(uint8_t value); // apply Gamma to single channel
[[gnu::hot]] static uint32_t Correct32(uint32_t color); // apply Gamma to RGBW32 color (WLED specific, not used by NPB)
static void calcGammaTable(float gamma); // re-calculates & fills gamma table
static void calcGammaTable(float gamma); // re-calculates & fills gamma tables
static inline uint8_t rawGamma8(uint8_t val) { return gammaT[val]; } // get value from Gamma table (WLED specific, not used by NPB)
static inline uint8_t rawInverseGamma8(uint8_t val) { return gammaT_inv[val]; } // get value from inverse Gamma table (WLED specific, not used by NPB)
private:
static uint8_t gammaT[];
static uint8_t gammaT_inv[];
};
#define gamma32(c) NeoGammaWLEDMethod::Correct32(c)
#define gamma8(c) NeoGammaWLEDMethod::rawGamma8(c)
#define gamma8inv(c) NeoGammaWLEDMethod::rawInverseGamma8(c)
[[gnu::hot, gnu::pure]] uint32_t color_blend(uint32_t c1, uint32_t c2 , uint8_t blend);
inline uint32_t color_blend16(uint32_t c1, uint32_t c2, uint16_t b) { return color_blend(c1, c2, b >> 8); };
[[gnu::hot, gnu::pure]] uint32_t color_add(uint32_t, uint32_t, bool preserveCR = false);