MAMEWorld Forums - EmuChat

Hi,

Now that 0155 is out, I wanted to play with the SDL shader a bit more and was wondering if someone might be able to help me or point me in the right direction. When using HLSL on my cabinet, I wanted to boost the floor a bit so that the screen stands out from the artwork (meaning black isn't totally black). I realize that probably goes against the grain since CRTs tend to have nice blacks. That having been said, it's something I want to do to help with the illusion of a CRT in the middle of a virtual cabinet.

Using HLSL I just set bump up floor a little to something like:
Code:

floor 0.05,0.05,0.05

However using a shader (Timothy Lottes as moded by SoltanGris42) I only seem to be successful in bosting the overall gamma, which I'm trying to avoid. What I initial did was to adjust the "gammaBoost":
Code:

const vec3 gammaBoost = vec3(1.0/1.15, 1.0/1.15, 1.0/1.3);

Which is used in the gama boot section:
Code:

#ifdef GAMMA_CONTRAST_BOOST
  gl_FragColor.rgb=brightMult*pow(gl_FragColor.rgb,gammaBoost )-vec3(blackClip);
#endif
  gl_FragColor=vec4(clamp(ToSrgb(gl_FragColor.rgb),0.0,1.0) , 1.0);

I see why this doesn't do what I want since it affecting overall gamma. Is there an (easy) way to just boost the floor a bit and not the entire gamma?

Thanks!