HDR Tonemap for HDRMod

[XgarhontX]

HDR

Changes to support HDRMod via compilation branching by HDR_ENABLED define macro.

I ended up not adding any new sliders/toggles.
When HDRMod is installed and enabled, Complementary will be HDR out of the box.

1000nits peak @ 203nits paper white

Changes

pipelineSettings.glsl

• New colorTex0Format & colortex3Format override to 16F for HDR values.

uniforms.glsl

• 3 New floats for HDR display information.
  • Peak
  • Scene Paper White
  • UI Paper White

commonFunctions.glsl

• Moved/New LinearToRGB() & RGBToLinear(), both vec3 and float.
  • I need it also at final.glsl.
  • TODO: Yea? Or nay, and final.glsl should copy and paste?

composite5.glsl

• Moved LinearToRGB() to commonFunctions.glsl.
• New HDR tonemapping.
  • Responds to all original SDR tonemap sliders like contrast, black desat, and white path.
    • Of course, stuff like white pass won't be same / is tuned differently.
  • Extends and steals toe from Lottes (only for those coeffs), then uses RenoDX's Reinhard Extended Piecewise for shoulder.
  • (This is as minimal as I could make before sacrificing the look. I was tempted to go crazy and import UCS like ICtCp, but refrained of it, lol.)
  • TODO: Should Lottes be made a common function?
• DoBSLColorSaturation() HDR
  • Some scaling to let algorithm take in and work with HDR values.

mainLighting.glsl

• Changed emission final result that'll be added to lighting when using IPBR.
  • Only for HDR, to reduce this perceptually awkward inverse-tonemap-like feeling and overly forced white clip for emissives revealed by the increase in stops.
  • Removed final pow2(emission) & just used a multiplier to make up loss.
    • (Also tested by patching on top of Euphoria + Supplemental, and they are fine.)
  • TODO: Is that the best place? I only want to target IPBR result, since labPBR aren't strong.

final.glsl

• Clamp vignette luminance dodge from HDR values.
• Disabled dithering in HDR.
• New UI brightness scaling
  • This is where I need the LinearToRGB() & RGBToLinear() to decode back to linear, apply brightness scaling, and reencode gamma.

composite.glsl & composite1.glsl

• Clamped against outputting negative values causing NaNs later, especially by bloom.

lensFlare.glsl

• For HDR, composite by simple addition to let it pop more.