GS: Add gamma control to ShadeBoost

[Gonzalosilvalde]

Description of Changes

• Add a Gamma parameter to ShadeBoost shaders (OpenGL & Vulkan).
• Expose a Gamma slider in the Qt Graphics Settings and the fullscreen in-game menu.

Rationale behind Changes

Gamma control lets users adjust mid-tones independently of brightness/contrast/saturation. Fulfills feature request #12515.

Suggested Testing Steps

• Open PCSX2.
• Emulate a game.
• Open graphics settings.
• Go to Postprocessing.
• Adjust Gamma as you see fit.

[RedDevilus]

Don't forget to format your files correctly, there are spaces where there have to be tabs, like for example:

(Using refined github extension in my browser to easily detect)

[Gonzalosilvalde]

I had a doubt about that, I saw those weird spacing in the git diff but in my text editor don't appear. I would see if I can change them.

[JordanTheToaster]

I had a doubt about that, I saw those weird spacing in the git diff but in my text editor don't appear.

You are using spaces not tabs.

[Gonzalosilvalde]

I still have errors...

[JordanTheToaster]

Still using spaces here.

[Gonzalosilvalde]

I think it's ok now, sorry for the problems.

[JordanTheToaster]

Do you plan to add these to Direct3D 11 and 12?

[Gonzalosilvalde]

I hadn’t planned on it, but I have no problem doing it if you’d like. At a glance, it should be pretty much the same.

[JordanTheToaster]

It would be good to have it on all backends if possible.

[Gonzalosilvalde]

I believe this change is sufficient for Direct3D 11 and 12, but I have no way to verify that it works. I would appreciate it if someone could test it so I can make any necessary adjustments.

[Mrlinkwii]

idk if the shadercache version needs bumped

[KrossX]

Tested on the Windows side, the following changes makes the dx11 shader changes work.

 	float3 satColor = lerp(intensity, brtColor, sat);
 	float3 conColor = lerp(AvgLumin, satColor, con);
 	
-	vec3 csb = conColor;
-	csb = pow(csb, vec3(1.0 / gam));
+	float gam_inv = 1.0/gam;
+	float3 csb = conColor;
+	csb = pow(csb, float3(gam_inv, gam_inv, gam_inv));
 	color.rgb = csb;
 	return color;

Also, the new GUI control does not follow the enable/disable state from the shadeboost checkbox. Other than that, it seems to work. 👍

[lightningterror]

float3, same for the above.

[lightningterror]

Better to move it between contrast and saturation to keep alphabetical order, same for other places.

[lightningterror]

Metal remaining.

[AmandaRoseChaqueta]

Minor bug (idk if it's exclusive to linux) but probably would be a good idea to position these buttons better on the blank space we have free. Currently it looks like this on 1080p screen

Also, you can edit it even without having Shade Boost selected.

[KrossX]

That might be good for another PR, to make that tab more organized. There's probably enough room for nice sliders too while at it.

[Gonzalosilvalde]

In this last commit I have changed:

• Now you can enable/disable the state from the shade boost box.
• In dx11/shadeboost.fx use a float3 and not a vec3 (needs test).
• Added gamma in metal (needs test).
• All 'shade boost' options are in alphabetical order.

What I didn't do:

• I don't know what @Mrlinkwii is referring to when he says “shadercache version needs bumped”, if someone explains it to me I do it no problem.
• I didn't position the buttons better in the white space as @AmyRoxwell suggested. As @KrossX said, I think it should go in another PR.

As is obvious, if any problems are encountered whether in dx11/12 or metal I'll be glad to fix them.

[kamfretoz]

* I don't know what @Mrlinkwii is referring to when he says “shadercache version needs bumped”, if someone explains it to me I do it no problem.

https://github.com/PCSX2/pcsx2/blob/master/pcsx2/ShaderCacheVersion.h#L6

You'll want to increment the shader cache version by one.

[TellowKrinkle]

The macOS compile is failing because cb in Metal is currently declared as a float3, which has no w. You should change it to a float4.

[TellowKrinkle]

Suggested change

	const float gam = cb.w;
	const float gam = cb.w;