Remove unused bits in GPUCopyAsset

The generated CS and compute files have some bits removed.

ScriptableRenderPipeline/Core/CoreRP/Resources/GPUCopy.compute

 
 #include "../ShaderLibrary/Common.hlsl"
 
-SamplerState sampler_LinearClamp;
-
-CBUFFER_START(cb)
-    float4 _Size;
-CBUFFER_END
-
 RWTexture2D<float1> _Result1;
 
 Texture2D<float4> _Source4;

ScriptableRenderPipeline/Core/CoreRP/Resources/GPUCopy.cs

 
         static readonly int _Result1 = Shader.PropertyToID("_Result1");
         static readonly int _Source4 = Shader.PropertyToID("_Source4");
-        static readonly int _Size = Shader.PropertyToID("_Size");
-                var s = new Vector4(size.x, size.y, 1f / size.x, 1f / size.y);
-                cmd.SetComputeVectorParam(m_Shader, _Size, s);
                 cmd.SetComputeTextureParam(m_Shader, k_SampleKernel_xyzw2x, _Source4, source);
                 cmd.SetComputeTextureParam(m_Shader, k_SampleKernel_xyzw2x, _Result1, target);
                 cmd.DispatchCompute(m_Shader, k_SampleKernel_xyzw2x, (int)Mathf.Max((size.x) / 8, 1), (int)Mathf.Max((size.y) / 8, 1), 1);

ScriptableRenderPipeline/Core/CoreRP/Resources/GPUCopyAsset.cs

             csc.AppendLine("        public GPUCopy(ComputeShader shader)");
             csc.AppendLine("        {");
             csc.AppendLine("            m_Shader = shader;");
-            csm.AppendLine("        static readonly int _Size = Shader.PropertyToID(\"_Size\");");
             for (var i = 0; i < operations.Length; i++)
             {
                 var o = operations[i];
                 // CSharp method
                 csm.AppendLine(string.Format(@"        public void SampleCopyChannel_{0}2{1}(CommandBuffer cmd, RenderTargetIdentifier source, RenderTargetIdentifier target, Vector2 size)", channelName, o.subscript));
                 csm.AppendLine("            {");
-                csm.AppendLine("                var s = new Vector4(size.x, size.y, 1f / size.x, 1f / size.y);");
-                csm.AppendLine("                cmd.SetComputeVectorParam(m_Shader, _Size, s);");
                 csm.AppendLine(string.Format("                cmd.SetComputeTextureParam(m_Shader, {0}, _Source{1}, source);", kernelIndexName, o.sourceChannel.ToString()));
                 csm.AppendLine(string.Format("                cmd.SetComputeTextureParam(m_Shader, {0}, _Result{1}, target);", kernelIndexName, o.targetChannel.ToString()));
                 csm.AppendLine(string.Format("                cmd.DispatchCompute(m_Shader, {0}, (int)Mathf.Max((size.x) / {1}, 1), (int)Mathf.Max((size.y) / {1}, 1), 1);", kernelIndexName, k_KernelSize.ToString()));
             cc.AppendLine(@"// Autogenerated file. Do not edit by hand");
             cc.AppendLine();
             cc.AppendLine(@"#include ""../ShaderLibrary/Common.hlsl""");
-            cc.AppendLine();
-            cc.AppendLine(@"SamplerState sampler_LinearClamp;");
-            cc.AppendLine();
-            cc.AppendLine(@"CBUFFER_START(cb)");
-            cc.AppendLine(@"    float4 _Size;");
-            cc.AppendLine(@"CBUFFER_END");
             cc.AppendLine(ccp.ToString()); // Properties
             cc.AppendLine(cck.ToString()); // Kernels