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, 8 insertions, 6 deletions

diff --git a/tools/gfx/render-graphics-common.h b/tools/gfx/render-graphics-common.h
index 5bb4cb59e..af2677905 100644
--- a/tools/gfx/render-graphics-common.h
+++ b/tools/gfx/render-graphics-common.h
@@ -5,18 +5,20 @@
 namespace gfx
 {
 
-class GraphicsAPIRenderer : public Renderer
+class GraphicsAPIRenderer : public IRenderer, public Slang::RefObject
 {
 public:
-    virtual Result createShaderObjectLayout(
+    SLANG_REF_OBJECT_IUNKNOWN_ALL
+    virtual SLANG_NO_THROW Result SLANG_MCALL createShaderObjectLayout(
         slang::TypeLayoutReflection* typeLayout, ShaderObjectLayout** outLayout) SLANG_OVERRIDE;
-    virtual Result createRootShaderObjectLayout(
+    virtual SLANG_NO_THROW Result SLANG_MCALL createRootShaderObjectLayout(
         slang::ProgramLayout* programLayout, ShaderObjectLayout** outLayout) SLANG_OVERRIDE;
-    virtual Result createShaderObject(ShaderObjectLayout* layout, ShaderObject** outObject) SLANG_OVERRIDE;
-    virtual Result createRootShaderObject(ShaderObjectLayout* rootLayout, ShaderObject** outObject) SLANG_OVERRIDE;
-    virtual Result bindRootShaderObject(PipelineType pipelineType,  ShaderObject* object) SLANG_OVERRIDE;
+    virtual SLANG_NO_THROW Result SLANG_MCALL createShaderObject(ShaderObjectLayout* layout, ShaderObject** outObject) SLANG_OVERRIDE;
+    virtual SLANG_NO_THROW Result SLANG_MCALL createRootShaderObject(ShaderObjectLayout* rootLayout, ShaderObject** outObject) SLANG_OVERRIDE;
+    virtual SLANG_NO_THROW Result SLANG_MCALL bindRootShaderObject(PipelineType pipelineType, ShaderObject* object) SLANG_OVERRIDE;
     void preparePipelineDesc(GraphicsPipelineStateDesc& desc);
     void preparePipelineDesc(ComputePipelineStateDesc& desc);
+    IRenderer* getInterface(const Slang::Guid& guid);
 };
 
 }