Merge pull request #1589 from Unity-Technologies/ios-texture-format

Fixup texture format mismatches for Metal on iOS

com.unity.render-pipelines.high-definition/HDRP/Material/GGXConvolution/RuntimeFilterIBL.cs

 
             if (!m_GgxIblSampleData)
             {
-                m_GgxIblSampleData = new RenderTexture(m_GgxIblMaxSampleCount, k_GgxIblMipCountMinusOne, 0, RenderTextureFormat.ARGBFloat, RenderTextureReadWrite.Linear);
+                m_GgxIblSampleData = new RenderTexture(m_GgxIblMaxSampleCount, k_GgxIblMipCountMinusOne, 0, RenderTextureFormat.ARGBHalf, RenderTextureReadWrite.Linear);
                 m_GgxIblSampleData.useMipMap = false;
                 m_GgxIblSampleData.autoGenerateMips = false;
                 m_GgxIblSampleData.enableRandomWrite = true;

com.unity.render-pipelines.high-definition/HDRP/RenderPipelineResources/CopyDepthBuffer.shader

             #include "CoreRP/ShaderLibrary/Common.hlsl"
             #include "../ShaderVariables.hlsl"
 
-            TEXTURE2D(_InputDepthTexture);
+            TEXTURE2D_FLOAT(_InputDepthTexture);
 
             struct Attributes
             {