Fixed few .SampleLevel call not using the abstractoin API

SampleScenes/Common/Shaders/CubemapColorMap.shader

-Shader "Hidden/CubemapColorMap" {
+Shader "Hidden/CubemapColorMap" {
     Properties {
         _ColorMap("Color", Cube) = "white" {}
         _MipIndex("Mip Index", Int) = 0
 
     #include "UnityCG.cginc"
 
-    TextureCube _ColorMap;
+    TEXTURECUBE(_ColorMap);
     int _MipIndex;
     SamplerState s_bilinear_clamp;
 
     }
 
     float4 Frag(v2f i) : SV_Target {
-        float3 col = _ColorMap.SampleLevel(s_bilinear_clamp, i.normalWS, _MipIndex).xyz;
+        float3 col = SAMPLE_TEXTURECUBE_LOD(_ColorMap, s_bilinear_clamp, i.normalWS, _MipIndex).xyz;
         return float4(col, 0.5);
     }
 

ScriptableRenderPipeline/Core/Resources/EncodeBC6H.compute

 RWTexture2DArray<uint4> _Target;
 int _MipIndex;
 
-SamplerState s_point_clamp;
+SAMPLER(s_point_clamp);
 
 static const uint2 kOffsets[] =
 {
     {
         nvc = CubemapTexelToNVC(topLeftSourceID + kOffsets[i], size);
         dir = CubemapTexelToDirection(nvc, faceId);
-        texels[i] = _Source.SampleLevel(s_point_clamp, dir, _MipIndex).rgb;
+        texels[i] = SAMPLE_TEXTURECUBE_LOD(_Source, s_point_clamp, dir, _MipIndex).rgb;
     }
 
     uint4 block = uint4(0, 0, 0, 0);

ScriptableRenderPipeline/Core/Resources/GPUCopy.compute

 
 RWTexture2D<float1> _Result1;
 
-Texture2D<float4> _Source4;
+TEXTURE2D(_Source4);
 
 
 #pragma kernel KSampleCopy4_1_x
-    _Result1[dispatchThreadId] = _Source4.SampleLevel(sampler_LinearClamp, float2(dispatchThreadId) * _Size.zw, 0.0).x;
+    _Result1[dispatchThreadId] = SAMPLE_TEXTURE2D_LOD(_Source4, sampler_LinearClamp, float2(dispatchThreadId) * _Size.zw, 0.0).x;
 }
 
 

ScriptableRenderPipeline/Core/Resources/GPUCopy.compute.meta

 fileFormatVersion: 2
-guid: a68d8aaeb0956234d94e389f196381ee
-timeCreated: 1507123133
-licenseType: Pro
+guid: a4d45eda75e8e474dbe24a31f741f3b4
 ComputeShaderImporter:
   externalObjects: {}
   currentAPIMask: 4

ScriptableRenderPipeline/Core/Resources/GPUCopyAsset.cs

-using System;
+using System;
 using System.Collections.Generic;
 using System.Text;
 
                     k_KernelSize.ToString(), k_KernelSize.ToString()));
                 cck.AppendLine(string.Format(@"void {0}(uint2 dispatchThreadId : SV_DispatchThreadID)", kernelName));
                 cck.AppendLine("{");
-                cck.AppendLine(string.Format("    _Result{0}[dispatchThreadId] = _Source{1}.SampleLevel(sampler_LinearClamp, float2(dispatchThreadId) * _Size.zw, 0.0).{2};",
+                cck.AppendLine(string.Format("    _Result{0}[dispatchThreadId] = SAMPLE_TEXTURE2D_LOD(_Source{1}, sampler_LinearClamp, float2(dispatchThreadId) * _Size.zw, 0.0).{2};",
                     o.targetChannel.ToString(), o.sourceChannel.ToString(), o.subscript));
                 cck.AppendLine("}");
                 cck.AppendLine();