add sparse texture gather intrinsics

CMakeLists.txt

@@ -369,15 +369,25 @@ add_subdirectory(external)
 
 # webgpu_dawn is only available as a fetched shared library, since Dawn's nested source
 # trees are too large and onerous for us to depend on.
+# We ignore the failure to fetch the library, since it's not required for the build to succeed.
 if(SLANG_WEBGPU_DAWN_BINARY_URL)
-    copy_fetched_shared_library("webgpu_dawn" "${SLANG_WEBGPU_DAWN_BINARY_URL}")
+    copy_fetched_shared_library(
+        "webgpu_dawn"
+        "${SLANG_WEBGPU_DAWN_BINARY_URL}"
+        IGNORE_FAILURE
+    )
 endif()
 
 # slang-tint is only available as a fetched shared library, since it's hosted in the Dawn
 # repository, and Dawn's nested source trees are too large and onerous for us to depend
 # on.
+# We ignore the failure to fetch the library, since it's not required for the build to succeed.
 if(SLANG_SLANG_TINT_BINARY_URL)
-    copy_fetched_shared_library("slang-tint" "${SLANG_SLANG_TINT_BINARY_URL}")
+    copy_fetched_shared_library(
+        "slang-tint"
+        "${SLANG_SLANG_TINT_BINARY_URL}"
+        IGNORE_FAILURE
+    )
 endif()
 
 fetch_or_build_slang_llvm()

prelude/CMakeLists.txt

@@ -12,8 +12,8 @@ foreach(input ${prelude_headers})
     add_custom_command(
         OUTPUT ${output}
         COMMAND
-            slang-embed "${input}" "${CMAKE_CURRENT_LIST_DIR}/../include"
-            ${output}
+            slang-embed "${input}" ${output}
+            "-I$<JOIN:$<TARGET_PROPERTY:core,INCLUDE_DIRECTORIES>, -I>"
         DEPENDS ${input} slang-embed
         VERBATIM
     )

source/slang/glsl.meta.slang

@@ -321,6 +321,17 @@ ${{{{
 }
 }}}}
 
+/// Array length
+__generic<T, let N : int>
+public extension Array<T, N>
+{
+    [ForceInline]
+    public int length()
+    {
+        return this.getCount();
+    }
+}
+
 //
 // Section 8.1. Angle and Trigonometry Functions
 //
@@ -9401,4 +9412,9 @@ __intrinsic_op($(kIROp_NonUniformResourceIndex))
 [require(cpp_cuda_glsl_hlsl_spirv, nonuniformqualifier)]
 public T nonuniformEXT(T index);
 
-
+/// Debug output printing
+[ForceInline]
+public void debugPrintfEXT<each T>(NativeString format, expand each T args)
+{
+    printf(format, args);
+}