Add gfx interface definition in Slang. (#2364)

* Add gfx interface definition in Slang.

- add gfx interface definitons in Slang.
- fix slang compiler to correctly type-check `out` interface argument.
- modify gfx interface to be fully COM compatible
- add convenient ShaderProgram creation methods to gfx.

* Fix compile errors and warnings.

* Update project files

* Fix cuda.

* Properly implement queryInterface in command encoder impls.

Co-authored-by: Yong He <yhe@nvidia.com>

1 files changed, 25 insertions, 0 deletions

diff --git a/tools/gfx/cuda/cuda-command-encoder.h b/tools/gfx/cuda/cuda-command-encoder.h
index 73660534a..9b7e94c8c 100644
--- a/tools/gfx/cuda/cuda-command-encoder.h
+++ b/tools/gfx/cuda/cuda-command-encoder.h
@@ -15,6 +15,25 @@ class ResourceCommandEncoderImpl : public IResourceCommandEncoder
 public:
     CommandWriter* m_writer;
 
+    virtual void* getInterface(SlangUUID const& uuid)
+    {
+        if (uuid == GfxGUID::IID_IResourceCommandEncoder || uuid == ISlangUnknown::getTypeGuid())
+            return this;
+        return nullptr;
+    }
+    virtual SLANG_NO_THROW SlangResult SLANG_MCALL
+        queryInterface(SlangUUID const& uuid, void** outObject) override
+    {
+        if (auto ptr = getInterface(uuid))
+        {
+            *outObject = ptr;
+            return SLANG_OK;
+        }
+        return SLANG_E_NO_INTERFACE;
+    }
+    virtual SLANG_NO_THROW uint32_t SLANG_MCALL addRef() { return 1; }
+    virtual SLANG_NO_THROW uint32_t SLANG_MCALL release() { return 1; }
+
     void init(CommandBufferImpl* cmdBuffer);
 
     virtual SLANG_NO_THROW void SLANG_MCALL endEncoding() override {}
@@ -111,6 +130,12 @@ class ComputeCommandEncoderImpl
 {
 public:
     SLANG_GFX_FORWARD_RESOURCE_COMMAND_ENCODER_IMPL(ResourceCommandEncoderImpl)
+    virtual void* getInterface(SlangUUID const& uuid) override
+    {
+        if (uuid == GfxGUID::IID_IResourceCommandEncoder || uuid == GfxGUID::IID_IComputeCommandEncoder || uuid == ISlangUnknown::getTypeGuid())
+            return this;
+        return nullptr;
+    }
 public:
     CommandWriter* m_writer;
     CommandBufferImpl* m_commandBuffer;