Fixed distortion scale

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

 
             using (new ProfilingSample(cmd, "ApplyDistortion", CustomSamplerId.ApplyDistortion.GetSampler()))
             {
-                var size = new Vector4(hdCamera.screenSize.x, hdCamera.screenSize.y);
+                var size = new Vector4(hdCamera.actualWidth, hdCamera.actualHeight, 1f / hdCamera.actualWidth, 1f / hdCamera.actualHeight);
                 uint x, y, z;
                 m_applyDistortionCS.GetKernelThreadGroupSizes(m_applyDistortionKernel, out x, out y, out z);
                 cmd.SetComputeTextureParam(m_applyDistortionCS, m_applyDistortionKernel, HDShaderIDs._DistortionTexture, m_DistortionBuffer);

com.unity.render-pipelines.high-definition/HDRP/RenderPipelineResources/ApplyDistorsion.compute

 #include "CoreRP/ShaderLibrary/Common.hlsl"
 #include "HDRP/Material/Builtin/BuiltinData.hlsl"
+#include "HDRP/ShaderVariables.hlsl"
-TEXTURE2D(_ColorPyramidTexture);
 RW_TEXTURE2D(float4, _Destination);
 
 SamplerState sampler_ColorPyramidTexture;
-    float4 _ColorPyramidScale;
 CBUFFER_END
 
 #pragma kernel KMain
         return;
 
     // Get source pixel for distortion
-    float2 distordedUV = float2(dispatchThreadId + int2(distortion * _FetchBias)) * _Size.zw;
+    float2 distordedUV = float2(dispatchThreadId + int2(distortion * _FetchBias)) * _Size.zw * _ScreenToTargetScale.xy;
     float mip = (_ColorPyramidScale.z - 1) * clamp(distortionBlur, 0.0, 1.0);
     float4 sampled = SAMPLE_TEXTURE2D_LOD(_ColorPyramidTexture, sampler_ColorPyramidTexture, distordedUV, mip);