Reimplement Vulkan shader objects. (#1764)

* Reimplement Vulkan shader objects.

This change reimplements Vulkan shader objects in the `gfx` layer so that it is no longer layered on top of the `DescriptorSet` abstraction. Since this is the last implementation that uses `DescriptorSet`, the change also removes all `DescriptorSet` related API from public `gfx` interface.

The Vulkan implementation now passes all test cases, but it still have two issues:
1. The PushConstant setting is not correct, this is because we don't seem to be able to get correct reflection data about the size of push constants for an entry-point.
2. The `shader-toy` example can't run on Vulkan, because it currently sets nullptr to `Texture` bindings, and this change doesn't properly handle setting resource to null in `ShaderObject`s yet. If we can use the `nullDescriptor` feature on vulkan, this implementation will be simple. However we still want to decide whether we want to use a Vulkan 1.2 feature for this.

* Fix up

1 files changed, 0 insertions, 36 deletions

diff --git a/tools/gfx/open-gl/render-gl.cpp b/tools/gfx/open-gl/render-gl.cpp
index 960670e1e..b9be7f1fc 100644
--- a/tools/gfx/open-gl/render-gl.cpp
+++ b/tools/gfx/open-gl/render-gl.cpp
@@ -129,42 +129,6 @@ public:
         UInt inputElementCount,
         IInputLayout** outLayout) override;
 
-    virtual SLANG_NO_THROW Result SLANG_MCALL createDescriptorSetLayout(
-        const IDescriptorSetLayout::Desc& desc, IDescriptorSetLayout** outLayout) override
-    {
-        SLANG_UNUSED(desc);
-        SLANG_UNUSED(outLayout);
-        return SLANG_FAIL;
-    }
-    virtual SLANG_NO_THROW Result SLANG_MCALL
-        createPipelineLayout(const IPipelineLayout::Desc& desc, IPipelineLayout** outLayout) override
-    {
-        SLANG_UNUSED(desc);
-        SLANG_UNUSED(outLayout);
-        return SLANG_FAIL;
-    }
-    virtual SLANG_NO_THROW Result SLANG_MCALL createDescriptorSet(
-        IDescriptorSetLayout* layout,
-        IDescriptorSet::Flag::Enum flag,
-        IDescriptorSet** outDescriptorSet) override
-    {
-        SLANG_UNUSED(layout);
-        SLANG_UNUSED(flag);
-        SLANG_UNUSED(outDescriptorSet);
-        return SLANG_FAIL;
-    }
-    virtual SLANG_NO_THROW void SLANG_MCALL setDescriptorSet(
-        PipelineType pipelineType,
-        IPipelineLayout* layout,
-        UInt index,
-        IDescriptorSet* descriptorSet) override
-    {
-        SLANG_UNUSED(pipelineType);
-        SLANG_UNUSED(layout);
-        SLANG_UNUSED(index);
-        SLANG_UNUSED(descriptorSet);
-    }
-
     virtual Result createShaderObjectLayout(
         slang::TypeLayoutReflection* typeLayout,
         ShaderObjectLayoutBase** outLayout) override;