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Question by InkaTorque · Jul 07, 2017 at 04:06 PM · shaderspritecolor changehlslramp

(Shader)How to find the cordinate of a given color inside a ramp texture?

I'm currently working on palette swap feature for my game's sprites on Unity . I know that this is normaly achieved by using a gayscale texture and then using a ramp texture to replace the colors or mapping each base color to a given channel value and then doing a lookup . BUT , since every sprite is hand drawn and painted , there are like a gazillion different RGB values and applying those techniques are a little troublesome .

So , what I want to do is write a shader that does the following :

-Get the RGB value of the pixel being processed
-Find the coordinate of that value in a palette texture ([n-colors]x2) (This is the part that i have no idea how to accomplish)
-With its coordinate , get the swap color that would be one row beneat the original color inside the palette texture
-Apply the new color to the sprite

Basically , this alt text

What i need to know is how to find the color inside the palette texture , basicaly a reverse tex2D(_Texture,coord)

Is there any way I could achieve this? If so , how efficient it is? Is there any other way?

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avatar image Kishotta · Jul 07, 2017 at 05:09 PM 0
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I don't have any insight on shaders, but if you haven't seen it, this GDC talk might be worth a watch.

avatar image InkaTorque Kishotta · Jul 07, 2017 at 05:44 PM 0
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Thank you !! I'll give it a watch

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