Update README and default config

Author: fholger

README.md

@@ -9,11 +9,12 @@ Included mods:
   * AMD FidelityFX Super Resolution
   * NVIDIA Image Scaling
   * AMD Contrast Adaptive Sharpening
+* Fixed foveated rendering (render center of image at full resolution, but drop resolution towards edges)
+  * Variable Rate Shading (only for NVIDIA RTX / GTX 16xx cards)
 
 Planned mods:
 
 * "Fixed foveated" rendering (render fewer pixels at the edges of the screen)
-  * Variable Rate Shading (only for NVIDIA RTX / GTX 16xx cards)
   * Radial Density Masking (all GPUs, but works only with a handful of games)
 * Force hidden area mask: don't render pixels at the edges that are not visible in the headset.
   Many games already use this mask, but not all. This mod will allow you to force its usage.

vrperfkit.yml

@@ -36,6 +36,27 @@ upscaling:
   # issues, you may want to turn this off.
   applyMipBias: true
 
+# Fixed foveated rendering: continue rendering the center of the image at full
+# resolution, but drop the resolution when going to the edges of the image.
+# There are four rings whose radii you can configure below. The inner ring/circle
+# is the area that's rendered at full resolution and reaches from the center to innerRadius.
+# The second ring reaches from innerRadius to midRadius and is rendered at half resolution.
+# The third ring reaches from midRadius to outerRadius and is rendered at 1/4th resolution.
+# The final fourth ring reaches from outerRadius to the edges of the image and is rendered
+# at 1/16th resolution.
+# Fixed foveated rendering is achieved with Variable Rate Shading. This technique is only
+# available on NVIDIA RTX and GTX 16xx cards.
+fixedFoveated:
+  # enable (true) or disable (false) fixed foveated rendering
+  enabled: false
+  # configure the end of the inner circle, which is the area that will be rendered at full resolution
+  innerRadius: 0.6
+  # configure the end of the second ring, which will be rendered at half resolution
+  midRadius: 0.8
+  # configure the end of the third ring, which will be rendered at 1/4th resolution
+  outerRadius: 1.0
+  # the remainder of the image will be rendered at 1/16th resolution
+
 # Enabling debugMode will visualize the radius to which upscaling is applied (see above).
 # It will also output additional log messages and regularly report how much GPU frame time
 # the post-processing costs.
@@ -66,3 +87,5 @@ hotkeys:
   # take a screen grab of the final (post-processed, upscaled) image.
   # The screen grab is stored as a dds file next to the DLL.
   captureOutput: ["ctrl", "f8"]
+  # toggle fixed foveated rendering
+  toggleFixedFoveated: ["alt", "f1"]