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  Fastest color addition with clamp 0-255 of RGB  (Read 3803 times)
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Offline DzzD
« Posted 2008-03-20 01:27:39 »

fast add of two 24/32 bit color

lsb of RG component must be set too zero

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public int addRGBColor(int color1,int color2)
{
 color1 &=0xFEFEFE; //set some lsb to 0
color2 &=0xFEFEFE; //set some lsb to 0
int color=color1+color2;  //add color
color|=(( color>>8 ) &0x010101)*0xFF;  //clamp color to 0 - 255
}


this introduce a little error on lsb bits but it is very fast

Offline brackeen

Junior Member





« Reply #1 - Posted 2008-03-20 18:49:25 »

Clever!

Any benchmarks compared it to using if statements to clamp?
Offline Markus_Persson

JGO Wizard


Medals: 14
Projects: 19


Mojang Specifications


« Reply #2 - Posted 2008-03-26 21:15:32 »

Haha, neat =D

Play Minecraft!
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