Remove WebGPU support (#4108)

Leaves SPV_ENV_WEBGPU_0 enum in place, but marked deprecated, so users
of the library are not broken by an API enum being removed.

Fixes #4101

2 files changed, 1 insertions, 42 deletions

diff --git a/include/spirv-tools/libspirv.h b/include/spirv-tools/libspirv.h
index a0114c3f4..8f412a668 100644
--- a/include/spirv-tools/libspirv.h
+++ b/include/spirv-tools/libspirv.h
@@ -482,7 +482,7 @@ typedef enum {
   SPV_ENV_OPENCL_EMBEDDED_2_2,  // OpenCL Embedded Profile 2.2 latest revision.
   SPV_ENV_UNIVERSAL_1_3,  // SPIR-V 1.3 latest revision, no other restrictions.
   SPV_ENV_VULKAN_1_1,     // Vulkan 1.1 latest revision.
-  SPV_ENV_WEBGPU_0,       // Work in progress WebGPU 1.0.
+  SPV_ENV_WEBGPU_0,       // DEPRECATED, may be removed in the future.
   SPV_ENV_UNIVERSAL_1_4,  // SPIR-V 1.4 latest revision, no other restrictions.
 
   // Vulkan 1.1 with VK_KHR_spirv_1_4, i.e. SPIR-V 1.4 binary.
diff --git a/include/spirv-tools/optimizer.hpp b/include/spirv-tools/optimizer.hpp
index 27352b250..1683d077f 100644
--- a/include/spirv-tools/optimizer.hpp
+++ b/include/spirv-tools/optimizer.hpp
@@ -68,11 +68,6 @@ class Optimizer {
   // The instance will have an empty message consumer, which ignores all
   // messages from the library. Use SetMessageConsumer() to supply a consumer
   // if messages are of concern.
-  //
-  // For collections of passes that are meant to transform the input into
-  // another execution environment, then the source environment should be
-  // supplied. e.g. for VulkanToWebGPUPasses the environment should be
-  // SPV_ENV_VULKAN_1_1 not SPV_ENV_WEBGPU_0.
   explicit Optimizer(spv_target_env env);
 
   // Disables copy/move constructor/assignment operations.
@@ -106,16 +101,6 @@ class Optimizer {
   // from time to time.
   Optimizer& RegisterSizePasses();
 
-  // Registers passes that have been prescribed for converting from Vulkan to
-  // WebGPU. This sequence of passes is subject to constant review and will
-  // change from time to time.
-  Optimizer& RegisterVulkanToWebGPUPasses();
-
-  // Registers passes that have been prescribed for converting from WebGPU to
-  // Vulkan. This sequence of passes is subject to constant review and will
-  // change from time to time.
-  Optimizer& RegisterWebGPUToVulkanPasses();
-
   // Registers passes that attempt to legalize the generated code.
   //
   // Note: this recipe is specially designed for legalizing SPIR-V. It should be
@@ -238,13 +223,6 @@ class Optimizer {
 // A null pass does nothing to the SPIR-V module to be optimized.
 Optimizer::PassToken CreateNullPass();
 
-// Creates a strip-atomic-counter-memory pass.
-// A strip-atomic-counter-memory pass removes all usages of the
-// AtomicCounterMemory bit in Memory Semantics bitmasks. This bit is a no-op in
-// Vulkan, so isn't needed in that env. And the related capability is not
-// allowed in WebGPU, so it is not allowed in that env.
-Optimizer::PassToken CreateStripAtomicCounterMemoryPass();
-
 // Creates a strip-debug-info pass.
 // A strip-debug-info pass removes all debug instructions (as documented in
 // Section 3.32.2 of the SPIR-V spec) of the SPIR-V module to be optimized.
@@ -802,30 +780,11 @@ Optimizer::PassToken CreateUpgradeMemoryModelPass();
 // where an instruction is moved into a more deeply nested construct.
 Optimizer::PassToken CreateCodeSinkingPass();
 
-// Create a pass to adds initializers for OpVariable calls that require them
-// in WebGPU. Currently this pass naively initializes variables that are
-// missing an initializer with a null value. In the future it may initialize
-// variables to the first value stored in them, if that is a constant.
-Optimizer::PassToken CreateGenerateWebGPUInitializersPass();
-
 // Create a pass to fix incorrect storage classes.  In order to make code
 // generation simpler, DXC may generate code where the storage classes do not
 // match up correctly.  This pass will fix the errors that it can.
 Optimizer::PassToken CreateFixStorageClassPass();
 
-// Create a pass to legalize OpVectorShuffle operands going into WebGPU. WebGPU
-// forbids using 0xFFFFFFFF, which indicates an undefined result, so this pass
-// converts those literals to 0.
-Optimizer::PassToken CreateLegalizeVectorShufflePass();
-
-// Create a pass to decompose initialized variables into a seperate variable
-// declaration and an initial store.
-Optimizer::PassToken CreateDecomposeInitializedVariablesPass();
-
-// Create a pass to attempt to split up invalid unreachable merge-blocks and
-// continue-targets to legalize for WebGPU.
-Optimizer::PassToken CreateSplitInvalidUnreachablePass();
-
 // Creates a graphics robust access pass.
 //
 // This pass injects code to clamp indexed accesses to buffers and internal