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

4 files changed, 10 insertions, 10 deletions

diff --git a/tools/graphics-app-framework/gui.cpp b/tools/graphics-app-framework/gui.cpp
index 8208bd606..3d6039f27 100644
--- a/tools/graphics-app-framework/gui.cpp
+++ b/tools/graphics-app-framework/gui.cpp
@@ -36,7 +36,7 @@ void setNativeWindowHook(Window* window, WNDPROC proc);
 #endif
 
 
-GUI::GUI(Window* window, Renderer* inRenderer)
+GUI::GUI(Window* window, IRenderer* inRenderer)
     : renderer(inRenderer)
 {
      ImGui::CreateContext();
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;
diff --git a/tools/graphics-app-framework/model.cpp b/tools/graphics-app-framework/model.cpp
index 5d3a850e4..6a61c64e5 100644
--- a/tools/graphics-app-framework/model.cpp
+++ b/tools/graphics-app-framework/model.cpp
@@ -98,7 +98,7 @@ namespace gfx
 {
 
 RefPtr<TextureResource> loadTextureImage(
-    Renderer*   renderer,
+    IRenderer*   renderer,
     char const* path)
 {
     int extentX = 0;
diff --git a/tools/graphics-app-framework/model.h b/tools/graphics-app-framework/model.h
index e86940244..446f57943 100644
--- a/tools/graphics-app-framework/model.h
+++ b/tools/graphics-app-framework/model.h
@@ -3,7 +3,7 @@
 
 #include "tools/gfx/render.h"
 #include "vector-math.h"
-
+#include "slang-com-ptr.h"
 #include <vector>
 #include <string>
 
@@ -65,10 +65,10 @@ struct ModelLoader
         FlipWinding = 1 << 0,
     };
 
-    ICallbacks*         callbacks = nullptr;
-    RefPtr<Renderer>    renderer;
-    LoadFlags           loadFlags = 0;
-    float               scale = 1.0f;
+    ICallbacks*              callbacks = nullptr;
+    Slang::ComPtr<IRenderer> renderer;
+    LoadFlags                loadFlags = 0;
+    float                    scale = 1.0f;
 
     Result load(char const* inputPath, void** outModel);
 };