8503 wgsl depth texture (#8645)

Add built-in type aliases for DepthTexture* and unify Sampler*Shadow
    
Add the following type aliases:
- DepthTexture1D, DepthTexture1DArray
- DepthTexture2D, DepthTexture2DArray
- DepthTexture2DMS, DepthTexture2DMSArray
- DepthTexture3D
- DepthTextureCube, DepthTextureCubeArray
    
These match with the type aliases for non-depth textures.
    
Also, unify the Sampler*Shadow type aliases with DepthTexture*
ones. This adds the following:
    
- Sampler2DMSShadow
- Sampler2DMSArrayShadow
    
and removes the Sampler3DArrayShadow type alias. As a side-effect, the
descriptions of Sampler*ArrayShadow type aliases are fixed
("texture-sampler for shadow" ==> "texture-sampler array for shadow").

Update the slang tests to use the newly introduced type aliases instead
of
the custom type aliases that use _Texture<> directly.

Add DepthTexture testing in
hlsl-intrinsic/texture/texture-intrinsics. Do this by extracting the
test logic of computeMain() in a separate function and parametrize it
for non-depth/depth texture types. This adds basic coverage for the
following types:

- DepthTexture1D
- DepthTexture2D
- DepthTexture3D
- DepthTextureCube
- DepthTexture1DArray
- DepthTexture2DArray
- DepthTextureCubeArray

Issue #6166
Issue #8503

1 files changed, 4 insertions, 57 deletions

diff --git a/tests/metal/texture-sampler-less.slang b/tests/metal/texture-sampler-less.slang
index 6a7646e9a..80e5be3eb 100644
--- a/tests/metal/texture-sampler-less.slang
+++ b/tests/metal/texture-sampler-less.slang
@@ -28,63 +28,10 @@ Sampler1DArray<float> t1DArray;
 Sampler2DArray<float> t2DArray;
 SamplerCubeArray<float> tCubeArray;
 
-// Metal doc says "For depth texture types, T must be float."
-__generic<T : ITexelElement, let sampleCount:int=0, let format:int=0>
-typealias depth2d = _Texture<
-    T,
-    __Shape2D,
-    0, // isArray
-    0, // isMS
-    sampleCount,
-    0, // access
-    1, // isShadow
-    1, // isCombined
-    format
->;
-
-__generic<T : ITexelElement, let sampleCount:int=0, let format:int=0>
-typealias depth2d_array = _Texture<
-    T,
-    __Shape2D,
-    1, // isArray
-    0, // isMS
-    sampleCount,
-    0, // access
-    1, // isShadow
-    1, // isCombined
-    format
->;
-
-__generic<T : ITexelElement, let sampleCount:int=0, let format:int=0>
-typealias depthcube = _Texture<
-    T,
-    __ShapeCube,
-    0, // isArray
-    0, // isMS
-    sampleCount,
-    0, // access
-    1, // isShadow
-    1, // isCombined
-    format
->;
-
-__generic<T : ITexelElement, let sampleCount:int=0, let format:int=0>
-typealias depthcube_array = _Texture<
-    T,
-    __ShapeCube,
-    1, // isArray
-    0, // isMS
-    sampleCount,
-    0, // access
-    1, // isShadow
-    1, // isCombined
-    format
->;
-
-depth2d<float> d2D;
-depthcube<float> dCube;
-depth2d_array<float> d2DArray;
-depthcube_array<float> dCubeArray;
+Sampler2DShadow d2D;
+SamplerCubeShadow dCube;
+Sampler2DArrayShadow d2DArray;
+SamplerCubeArrayShadow dCubeArray;
 
 bool TEST_texture_float()
 {