MAMEWorld Forums - EmuChat - Re: Sony CXA2025AS US

> Hi again,
>
> Sorry for the delay. Super busy at work. I'm attaching a zip file with a shader
> called "yiqcolor" that just encodes an RGB color as YIQ using the standard matrix,
> applies tint/saturation adjustment, and then takes it back to RGB.
>
> It has presets for the wikipedia YIQ->RGB formula as well as coefficients for the FCC
> standard, the Sony US matrix you posted, a different Sony YUV matrix, and a custom
> one that you can define in the shader. Probably most formulas you could find online
> are just a phase shift away from the standard, but that's fine.
>
> The ZIP file contains a "bgfx" folder that you can merge with the bgfx folder in MAME
> 0.172. Then you can try out the effect with either the included "hlsl_yiq_tweak" or
> "yiqcolor" bgfx shader chains.
>
> NOTE: It will stop working with 0173 since MooglyGuy has made a lot of changes to
> bgfx since 0172.
>
> The shader chain, "hlsl_yiq_tweak", is just the standard hlsl shader chain with the
> color effect replaced with this and different defaults.
>
> The shader chain, "yiqcolor", is just the color effects and nothing else.
>
> I also included the shader source, as simple as it is.
>
> -greg
>

Excellent; the stab at it is once again appreciated...Thank you, Greg!