Implement a workaround for the broken MIP copy code

Author: EvgeniiG

Assets/ScriptableRenderLoop/HDRenderLoop/Sky/SkyRenderer.cs

@@ -244,23 +244,17 @@ private void RenderCubemapGGXConvolution(Texture input, RenderTexture target, Re
                     return;
                 }
 
+                var cmd = new CommandBuffer { name = "" };
+
                 // Copy the first mip.
 
                 // TEMP code until CopyTexture is implemented for command buffer
-                // All parameters are neutral because exposure/multiplier have already been applied in the first copy.
-                SkyParameters skyParams = new SkyParameters();
-                skyParams.exposure = 0.0f;
-                skyParams.multiplier = 1.0f;
-                skyParams.rotation = 0.0f;
-                skyParams.skyHDRI = input;
-                RenderSkyToCubemap(skyParams, target, renderLoop);
+                cmd.CopyTexture(input, target);
                 // End temp
 
-                // 
                 //for (int f = 0; f < 6; f++)
                 //    Graphics.CopyTexture(input, f, 0, target, f, 0);
 
-
                 // Do the convolution on remaining mipmaps
                 float invOmegaP = (6.0f * input.width * input.width) / (4.0f * Mathf.PI); // Solid angle associated to a pixel of the cubemap;
 
@@ -276,8 +270,7 @@ private void RenderCubemapGGXConvolution(Texture input, RenderTexture target, Re
                     for (int face = 0; face < 6; ++face)
                     {
                         Utilities.SetRenderTarget(renderLoop, target, mip, (CubemapFace)face);
- 
-                        var cmd = new CommandBuffer { name = "" };
+
                         cmd.DrawMesh(m_CubemapFaceMesh[face], Matrix4x4.identity, m_GGXConvolveMaterial, 0, 0, propertyBlock);
                         renderLoop.ExecuteCommandBuffer(cmd);
                         cmd.Dispose();