[Port] [6000.0] Fix UUM-125596 AcesTonemap() half precision bug

svc-reach-platform-support · Evergreen · commit 870ac3121750 · 2025-12-15T19:17:04.000Z
diff --git a/Packages/com.unity.render-pipelines.core/ShaderLibrary/Color.hlsl b/Packages/com.unity.render-pipelines.core/ShaderLibrary/Color.hlsl
@@ -651,7 +651,7 @@ float3 AcesTonemap(float3 aces)
 
     // --- Red modifier --- //
     half hue = rgb_2_hue(half3(aces));
-    half centeredHue = center_hue(hue, RRT_RED_HUE);
+    float centeredHue = center_hue(hue, RRT_RED_HUE); // UUM-125596 Must be float for subsequent calculations
     float hueWeight;
     {
         //hueWeight = cubic_basis_shaper(centeredHue, RRT_RED_WIDTH);

Original file line number	Diff line number	Diff line change
`@@ -651,7 +651,7 @@ float3 AcesTonemap(float3 aces)`
`651`	`651`
`652`	`652`	`// --- Red modifier --- //`
`653`	`653`	`half hue = rgb_2_hue(half3(aces));`
`654`		`- half centeredHue = center_hue(hue, RRT_RED_HUE);`
	`654`	`+ float centeredHue = center_hue(hue, RRT_RED_HUE); // UUM-125596 Must be float for subsequent calculations`
`655`	`655`	`float hueWeight;`
`656`	`656`	`{`
`657`	`657`	`//hueWeight = cubic_basis_shaper(centeredHue, RRT_RED_WIDTH);`