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, 47 insertions, 3 deletions

diff --git a/tools/gfx/vulkan/vk-command-encoder.h b/tools/gfx/vulkan/vk-command-encoder.h
index f71e262c5..0e834a5fb 100644
--- a/tools/gfx/vulkan/vk-command-encoder.h
+++ b/tools/gfx/vulkan/vk-command-encoder.h
@@ -12,7 +12,7 @@ using namespace Slang;
 namespace vk
 {
 
-class PipelineCommandEncoder : public RefObject
+class PipelineCommandEncoder : public ComObject
 {
 public:
     CommandBufferImpl* m_commandBuffer;
@@ -54,6 +54,25 @@ class ResourceCommandEncoder
     , public PipelineCommandEncoder
 {
 public:
+    virtual void* getInterface(SlangUUID const& guid)
+    {
+        if (guid == GfxGUID::IID_IResourceCommandEncoder || guid == ISlangUnknown::getTypeGuid())
+            return this;
+        return nullptr;
+    }
+    virtual SLANG_NO_THROW SlangResult SLANG_MCALL
+        queryInterface(SlangUUID const& uuid, void** outObject)
+    {
+        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; }
+
     virtual SLANG_NO_THROW void SLANG_MCALL copyBuffer(
         IBufferResource* dst,
         Offset dstOffset,
@@ -150,8 +169,16 @@ class RenderCommandEncoder
     : public IRenderCommandEncoder
     , public ResourceCommandEncoder
 {
-public:
     SLANG_GFX_FORWARD_RESOURCE_COMMAND_ENCODER_IMPL(ResourceCommandEncoder)
+    virtual void* getInterface(SlangUUID const& uuid) override
+    {
+        if (uuid == GfxGUID::IID_IResourceCommandEncoder || uuid == GfxGUID::IID_IRenderCommandEncoder || uuid == ISlangUnknown::getTypeGuid())
+        {
+            return this;
+        }
+        return nullptr;
+    }
+
 public:
     List<VkViewport> m_viewports;
     List<VkRect2D> m_scissorRects;
@@ -233,7 +260,15 @@ class ComputeCommandEncoder
 {
 public:
     SLANG_GFX_FORWARD_RESOURCE_COMMAND_ENCODER_IMPL(ResourceCommandEncoder)
-public:
+    virtual void* getInterface(SlangUUID const& uuid) override
+    {
+        if (uuid == GfxGUID::IID_IResourceCommandEncoder || uuid == GfxGUID::IID_IComputeCommandEncoder || uuid == ISlangUnknown::getTypeGuid())
+        {
+            return this;
+        }
+        return nullptr;
+    }
+
     virtual SLANG_NO_THROW void SLANG_MCALL endEncoding() override;
 
     virtual SLANG_NO_THROW Result SLANG_MCALL
@@ -254,7 +289,16 @@ class RayTracingCommandEncoder
 {
 public:
     SLANG_GFX_FORWARD_RESOURCE_COMMAND_ENCODER_IMPL(ResourceCommandEncoder)
+    virtual void* getInterface(SlangUUID const& uuid) override
+    {
+        if (uuid == GfxGUID::IID_IResourceCommandEncoder || uuid == GfxGUID::IID_IRayTracingCommandEncoder || uuid == ISlangUnknown::getTypeGuid())
+        {
+            return this;
+        }
+        return nullptr;
+    }
 public:
+
     void _memoryBarrier(
         int count,
         IAccelerationStructure* const* structures,