From be76c9a13804eeddb93b61abe6a51234ffd97245 Mon Sep 17 00:00:00 2001
From: Nico de Poel <ndepoel@gmail.com>
Date: Sat, 14 Dec 2024 20:26:16 +0100
Subject: [PATCH] Fixed FSR2 auto-exposure issue with OpenGL Core on Nvidia
 GPUs, most likely due to reading uninitialized texture data.

---
 Shaders/shaders/fsr2/ffx_fsr2_compute_luminance_pyramid.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Shaders/shaders/fsr2/ffx_fsr2_compute_luminance_pyramid.h b/Shaders/shaders/fsr2/ffx_fsr2_compute_luminance_pyramid.h
index d8d4820..a0e74b0 100644
--- a/Shaders/shaders/fsr2/ffx_fsr2_compute_luminance_pyramid.h
+++ b/Shaders/shaders/fsr2/ffx_fsr2_compute_luminance_pyramid.h
@@ -83,6 +83,7 @@ void SpdStore(FfxInt32x2 pix, FfxFloat32x4 outValue, FfxUInt32 index, FfxUInt32
             {
                 FfxFloat32 rate = 1.0f;
                 result = prev + (result - prev) * (1 - exp(-DeltaTime() * rate));
+                result = ffxMax(0.0f, result);
             }
             FfxFloat32x2 spdOutput = FfxFloat32x2(ComputeAutoExposureFromLavg(result), result);
             SPD_SetExposureBuffer(spdOutput);