feat: Implement full HDR rendering into Community Shaders for Skyrim

[Dakraid]

This is an implementation for HDR into Skyrim and Community Shaders.
Various issues still have to be resolved, and the tonemapper needs to be rewritten.

Known Issues:

• Disabling HDR does not work properly (*1)
• Mismatched output between non-TAA and TAA/FSR/DLSS (*2)
• Output between FG on and off differs (*2)
• Occasionally it requires opening the CS UI to work (*3)
• Overall quality of the implementation
• Further testing for various cases and combinations

Notes:

1. Issues with disabling HDR may be related to the problem that it requires a restart but still immediately disables everything but not patched buffers or SwapChains.
   • Fixed by delaying application of the new state until after reload
2. Mismatched output could be because of different input textures into the tonemapping shader
   • Fixed with the approach within commit a6fac0c
3. For some reason opening the Display tab in the CS UI is sometimes (always?) required to get an image.
   • Fixed by updating the constant buffer variables after setup

Improvements:

• Implement a check to see if a display even supports HDR output
• Set HDR to default to off instead of on

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[github-actions]

Using provided base ref: dcdbaf3
Using base ref: dcdbaf3
Base commit date: 2025-08-17T20:52:19+01:00 (Sunday, August 17, 2025 08:52 PM)
No actionable suggestions for changed features.