Make `gfx::Renderer` a COM interface. (#1653)

* Make `gfx::Renderer` a COM interface.

This is a first step towards making the `gfx` library expose a COM compatible DLL interface. Remaining classes will come as separate PRs.

* Fixup project files

* Fix calling conventions

* Make gfx::create*Renderer() functions increase ref count by 1

* Make renderer createFunc return via out parameter

1 files changed, 3 insertions, 3 deletions

diff --git a/tools/graphics-app-framework/gui.h b/tools/graphics-app-framework/gui.h
index d2c52de3c..fa6fda1d1 100644
--- a/tools/graphics-app-framework/gui.h
+++ b/tools/graphics-app-framework/gui.h
@@ -4,21 +4,21 @@
 #include "tools/gfx/render.h"
 #include "vector-math.h"
 #include "window.h"
-
+#include "slang-com-ptr.h"
 #include "external/imgui/imgui.h"
 
 namespace gfx {
 
 struct GUI : RefObject
 {
-    GUI(Window* window, Renderer* renderer);
+    GUI(Window* window, IRenderer* renderer);
     ~GUI();
 
     void beginFrame();
     void endFrame();
 
 private:
-    RefPtr<Renderer>            renderer;
+    Slang::ComPtr<IRenderer>    renderer;
     RefPtr<PipelineState>       pipelineState;
     RefPtr<DescriptorSetLayout> descriptorSetLayout;
     RefPtr<PipelineLayout>      pipelineLayout;