Post-Process Stack

[Williscool13]

Expand on the post-process stack already present in the engine. At the very least, the Engine should be improved to include:

• Bloom
• Vignette
• Motion Blur (Can be it's own PR)
• SSAO/GTAO (Can be its own PR)
• Cel Shading (Can be its own PR)

[Williscool13]

GTAO is implemented in #39, implementation taken from XE_GTAO. Further shadow improvements is made with screen space shadows (contact shadows), implementation taken from Bend Studio implemented in #44.

[Williscool13]

Going to try exhaustively listing PP effects to be made:

• Brightness/Contrast/Saturation
• LUTs (beyond existing color grading)
• Vignette
• Chromatic abberation
• Film Grain
• Sharpen
• Blur
• Bloom,
• Lens Flares
• Depth of Field
• Motion Blur
• Lens Distortion