mattiasgustavsson
/ rgb_blend.c
Last active
May 30, 2025 20:11
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| // color1 and color2 are R4G4B4 12bit RGB color values, alpha is 0-255 | |
| uint16_t blend_12bit( uint16_t color1, uint16_t color2, uint8_t alpha ) { | |
| uint64_t c1 = (uint64_t) color1; | |
| uint64_t c2 = (uint64_t) color2; | |
| uint64_t a = (uint64_t)( alpha >> 4 ); | |
| // bit magic to alpha blend R G B with single mul | |
| c1 = ( c1 | ( c1 << 12 ) ) & 0x0f0f0f; | |
| c2 = ( c2 | ( c2 << 12 ) ) & 0x0f0f0f; | |
| uint32_t o = ( ( ( ( c2 - c1 ) * a ) >> 4 ) + c1 ) & 0x0f0f0f; |
mattiasgustavsson
/ bass_and_treble.h
Created
January 30, 2025 13:06
Audio filters for a stereo widening effect and for simple bass/treble eq
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| /* | |
| ------------------------------------------------------------------------------ | |
| Licensing information can be found at the end of the file. | |
| ------------------------------------------------------------------------------ | |
| bass_and_treble.h - v1.0 - Simple audio filter to boost bass and treble. | |
| Do this: | |
| #define BASS_AND_TREBLE_IMPLEMENTATION | |
| before you include this file in *one* C/C++ file to create the implementation. |