[Jira # UUM-65289] Fix correct resolution for refractive color pyramid sampling with DRS

Lit shader passes were sampling the incorrect resolution for the color pyramid texture. When DRS goes from low to high, this would be noticeable by flickering of refractive surfaces.

Example of the artifact:
![hh_flicker](https://media.github.cds.internal.unity3d.com/user/3327/files/96e08861-953b-4fe2-80cd-d3db17ef418f)

Author: kecho

Packages/com.unity.render-pipelines.high-definition/Runtime/Material/Lit/Lit.hlsl

@@ -1887,9 +1887,9 @@ IndirectLighting EvaluateBSDF_ScreenspaceRefraction(LightLoopContext lightLoopCo
     float mipLevel = preLightData.transparentSSMipLevel;
 
     // Clamp to avoid potential leaks around the edges when the dynamic resolution is set to low and the smoothness too.
-    float2 diffLimit = _ColorPyramidUvScaleAndLimitPrevFrame.xy - _ColorPyramidUvScaleAndLimitPrevFrame.zw;
+    float2 diffLimit = _ColorPyramidUvScaleAndLimitCurrentFrame.xy - _ColorPyramidUvScaleAndLimitCurrentFrame.zw;
     float2 diffLimitMipAdjusted = diffLimit * pow(2.0,2.0 + ceil(abs(mipLevel)));
-    float2 limit = _ColorPyramidUvScaleAndLimitPrevFrame.xy - diffLimitMipAdjusted;
+    float2 limit = _ColorPyramidUvScaleAndLimitCurrentFrame.xy - diffLimitMipAdjusted;
 
     samplingUV.xy = min(samplingUV.xy, limit);
 

Packages/com.unity.render-pipelines.high-definition/Runtime/RenderPipeline/HDRenderPipeline.cs

@@ -1173,6 +1173,7 @@ void UpdateShaderVariablesGlobalCB(HDCamera hdCamera, CommandBuffer cmd)
                 m_ShaderVariablesGlobalCB._VolumetricCloudsShadowOriginToggle -= new Vector4(hdCamera.camera.transform.position.x, hdCamera.camera.transform.position.y, hdCamera.camera.transform.position.z, 0);
             }
             m_ShaderVariablesGlobalCB._VolumetricCloudsFallBackValue = m_VolumetricCloudsShadowRegion.fallbackValue;
+            m_ShaderVariablesGlobalCB._ColorPyramidUvScaleAndLimitCurrentFrame = HDUtils.ComputeViewportScaleAndLimit(hdCamera.historyRTHandleProperties.currentViewportSize, hdCamera.historyRTHandleProperties.currentViewportSize);
             m_ShaderVariablesGlobalCB._ColorPyramidUvScaleAndLimitPrevFrame = HDUtils.ComputeViewportScaleAndLimit(hdCamera.historyRTHandleProperties.previousViewportSize, hdCamera.historyRTHandleProperties.previousRenderTargetSize);
 
             ConstantBuffer.PushGlobal(cmd, m_ShaderVariablesGlobalCB, HDShaderIDs._ShaderVariablesGlobal);

Packages/com.unity.render-pipelines.high-definition/Runtime/RenderPipeline/HDStringConstants.cs

@@ -470,7 +470,6 @@ static class HDShaderIDs
         public static readonly int _RenderingLayersTexture = Shader.PropertyToID("_RenderingLayersTexture");
         public static readonly int _DistortionTexture = Shader.PropertyToID("_DistortionTexture");
         public static readonly int _ColorPyramidTexture = Shader.PropertyToID("_ColorPyramidTexture");
-        public static readonly int _ColorPyramidUvScaleAndLimitPrevFrame = Shader.PropertyToID("_ColorPyramidUvScaleAndLimitPrevFrame");
         public static readonly int _RoughDistortion = Shader.PropertyToID("_RoughDistortion");
 
         public static readonly int _DebugColorPickerTexture = Shader.PropertyToID("_DebugColorPickerTexture");

Packages/com.unity.render-pipelines.high-definition/Runtime/ShaderLibrary/ShaderVariablesGlobal.cs

@@ -301,7 +301,7 @@ unsafe struct ShaderVariablesGlobal
         public uint _EnableComputeThickness;
         public float _VolumetricCloudsFallBackValue;
         public Vector4 _VolumetricCloudsShadowOriginToggle;
-
+        public Vector4 _ColorPyramidUvScaleAndLimitCurrentFrame;
         public Vector4 _ColorPyramidUvScaleAndLimitPrevFrame;
     }
 }

Packages/com.unity.render-pipelines.high-definition/Runtime/ShaderLibrary/ShaderVariablesGlobal.cs.hlsl

@@ -179,6 +179,7 @@ GLOBAL_CBUFFER_START(ShaderVariablesGlobal, b0)
     uint _EnableComputeThickness;
     float _VolumetricCloudsFallBackValue;
     float4 _VolumetricCloudsShadowOriginToggle;
+    float4 _ColorPyramidUvScaleAndLimitCurrentFrame;
     float4 _ColorPyramidUvScaleAndLimitPrevFrame;
 CBUFFER_END