Adapter selection for Renderer (#923)

* * Make adapter used selectable on the command line
* Added 'adapter' to Renderer::Desc with dx11, dx12, vk honoring it
* GL will check that the renderer matches, but cannot select a specific device
* Share functionality on dx adapter selection in D3DUtil

Note - that on tests that use OpenGL and the adapter doesn't match it will ignore the test (and display a message that the appropriate device couldn't be started)

* Small function name improvement.

* Variable rename to match type.

* Fix typo in Dx12 device selection.

* * Add checking if an adapter is warp
* Improve some comments

1 files changed, 6 insertions, 2 deletions

diff --git a/tools/gfx/render.h b/tools/gfx/render.h
index 775e71613..eebeaa170 100644
--- a/tools/gfx/render.h
+++ b/tools/gfx/render.h
@@ -779,8 +779,9 @@ public:
 
     struct Desc
     {
-        int width;          ///< Width in pixels
-        int height;         ///< height in pixels
+        int width;                  ///< Width in pixels
+        int height;                 ///< height in pixels
+        Slang::String adapter;      ///< Name to identify the adapter to use
     };
 
     virtual SlangResult initialize(const Desc& desc, void* inWindowHandle) = 0;
@@ -978,6 +979,9 @@ struct RendererUtil
         /// Get the binding style from the type
     static BindingStyle getBindingStyle(RendererType type) { return s_rendererTypeToBindingStyle[int(type)]; }
 
+        /// Get as text
+    static Slang::UnownedStringSlice toText(RendererType type);
+
     private:
     static void compileTimeAsserts();
     static const uint8_t s_formatSize[]; // Maps Format::XXX to a size in bytes;