Update RenderingContext and D3D12Renderer to use new API.

Ghost.Graphics/test.gshader

@@ -3,10 +3,10 @@ shader "MyShader/Standard"
     properties
     {
         float4 color = float4(1, 1, 1, 1);
-        texture2d texture1 = texture2d(black);
-        texture2d texture2 = texture2d(white);
-        texture2d texture3 = texture2d(grey);
-        texture2d texture4 = texture2d(normal);
+        tex2d_b texture1 = tex2d_b(black);
+        tex2d_b texture2 = tex2d_b(white);
+        tex2d_b texture3 = tex2d_b(grey);
+        tex2d_b texture4 = tex2d_b(normal);
     }
 
     pipeline
@@ -28,4 +28,4 @@ shader "MyShader/Standard"
             "F:/csharp/GhostEngine/Ghost.Shader/BuiltIn/Common.hlsl";
         }
     }
-}
+}