Add a CPU renderer implementation (#1750)

* Add a CPU renderer implementation

This change adds a CPU back-end to `gfx` and ensures that most of our existing CPU tests pass when using it.

Detailed notes:

* Most of the CPU renderer implementation is copy-pasted from the CUDA case, so they share a lot of similar logic

* The main addition to the CPU renderer is a semi-complete implementation of host-memory textures. The logic here handles all the main shapes (Buffer, 1D, 2D, 3D, Cube) and all the currently-supported `Format`s that are sample-able as-is (no D24S8). The implementation is not intended to be fast, and it currently only does nearest-neighbor sampling, but otherwise it tries to avoid cutting too many corners and should be ar reasonable starting point for a more complete (but not performance-oriented) implementation.

* Refactored the CPU prelude `IRWTexture` interface to inherit from `ITexture`, since in most cases a single type will end up implementing both. It might be worth it to collapse it all down to a single interface later.

* Changed the CPU prelude `ITexture`/`IRWTexture` interface so that it takes both a pointer *and* a size for output arguments. This change seems necessary to allow a shader variable declared as a `Texture2D<float>` to fetch a single `float` when the underlying texture might be using RGBA32F.

* Added to the `IComponentType` public API so that we can query a "host callable" for an entry point and not just a binary.

* Turned off the `-shaderobj` flag on two tests that weren't yet compatible with shader objects but still had the flag left in on the path (since previously the CPU path always used the non-`gfx` non-shader-object logic anyway)

* Disabled one test (`dynamic-dispatch-11`) that relied on the `ConstantBuffer<IInterface>` idiom that we know we are planning to chagne soon anyway.

* Made a few changes to the CUDA path to bring it into line with what I added for the CPU path. These were mostly bug fixes around indexing logic for sub-objects and resources.

* fixup

2 files changed, 8 insertions, 0 deletions

diff --git a/build/visual-studio/gfx/gfx.vcxproj b/build/visual-studio/gfx/gfx.vcxproj
index 5f05d7586..08786b5cf 100644
--- a/build/visual-studio/gfx/gfx.vcxproj
+++ b/build/visual-studio/gfx/gfx.vcxproj
@@ -181,6 +181,7 @@
   <ItemGroup>
     <ClInclude Include="..\..\..\slang-gfx.h" />
     <ClInclude Include="..\..\..\tools\gfx\command-writer.h" />
+    <ClInclude Include="..\..\..\tools\gfx\cpu\render-cpu.h" />
     <ClInclude Include="..\..\..\tools\gfx\cuda\render-cuda.h" />
     <ClInclude Include="..\..\..\tools\gfx\d3d\d3d-swapchain.h" />
     <ClInclude Include="..\..\..\tools\gfx\d3d\d3d-util.h" />
@@ -206,6 +207,7 @@
     <ClInclude Include="..\..\..\tools\gfx\vulkan\vk-util.h" />
   </ItemGroup>
   <ItemGroup>
+    <ClCompile Include="..\..\..\tools\gfx\cpu\render-cpu.cpp" />
     <ClCompile Include="..\..\..\tools\gfx\cuda\render-cuda.cpp" />
     <ClCompile Include="..\..\..\tools\gfx\d3d\d3d-swapchain.cpp" />
     <ClCompile Include="..\..\..\tools\gfx\d3d\d3d-util.cpp" />
diff --git a/build/visual-studio/gfx/gfx.vcxproj.filters b/build/visual-studio/gfx/gfx.vcxproj.filters
index c7836d62f..cff8cc95a 100644
--- a/build/visual-studio/gfx/gfx.vcxproj.filters
+++ b/build/visual-studio/gfx/gfx.vcxproj.filters
@@ -15,6 +15,9 @@
     <ClInclude Include="..\..\..\tools\gfx\command-writer.h">
       <Filter>Header Files</Filter>
     </ClInclude>
+    <ClInclude Include="..\..\..\tools\gfx\cpu\render-cpu.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
     <ClInclude Include="..\..\..\tools\gfx\cuda\render-cuda.h">
       <Filter>Header Files</Filter>
     </ClInclude>
@@ -86,6 +89,9 @@
     </ClInclude>
   </ItemGroup>
   <ItemGroup>
+    <ClCompile Include="..\..\..\tools\gfx\cpu\render-cpu.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
     <ClCompile Include="..\..\..\tools\gfx\cuda\render-cuda.cpp">
       <Filter>Source Files</Filter>
     </ClCompile>