Use CeilToInt to process texture borders when its size is not a power of 8

ScriptableRenderPipeline/HDRenderPipeline/HDRenderPipeline.cs

                 cmd.SetComputeVectorParam(resources.applyDistortionCS, HDShaderIDs._Size, size);
                 cmd.SetComputeVectorParam(resources.applyDistortionCS, HDShaderIDs._ZBufferParams, Shader.GetGlobalVector(HDShaderIDs._ZBufferParams));
                 cmd.SetComputeVectorParam(resources.applyDistortionCS, HDShaderIDs._GaussianPyramidColorMipSize, Shader.GetGlobalVector(HDShaderIDs._GaussianPyramidColorMipSize));
-                cmd.DispatchCompute(resources.applyDistortionCS, resources.applyDistortionKernel, (int)(size.x) / (int)x, (int)(size.y) / (int)y, 1);
+
+                cmd.DispatchCompute(resources.applyDistortionCS, resources.applyDistortionKernel, Mathf.CeilToInt(size.x / x), Mathf.CeilToInt(size.y / y), 1);
             }
         }