kc3-lang/angle/src/compiler/translator/wgsl/WGSLProgramPrelude.h

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• Hash : fecb8ead
  Author :
  Date : 2025-09-04T12:27:48
  

  WGSL: implement inc/dec with generated functions
  
  Implements inc/dec with generated WGSL functions that take pointers
  and perform a post/pre inc/decrement. This works with scalars, vectors,
  and matrices, both float and int.
  
  WGSL supports inc/dec only on integer types, and only as statements
  (not as expressions). https://www.w3.org/TR/WGSL/#increment-decrement.
  The regular ++ and -- are used in this specific case.
  
  The WGSL outputter records usage of increment/decrement and produces
  a call to the correct function. A new class is introduced to keep the
  record of which types need generated inc/dec WGSL functions.
  
  Bug: angleproject:42267100
  Change-Id: I0e70760ba5bd00f978e216f958216ae3137a146e
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/6935269
  Commit-Queue: Matthew Denton <mpdenton@chromium.org>
  Reviewed-by: Geoff Lang <geofflang@chromium.org>
  

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• src/compiler/translator/wgsl/WGSLProgramPrelude.h

• //
  // Copyright 2025 The ANGLE Project Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  //
  
  #ifndef COMPILER_TRANSLATOR_WGSL_WGSL_PROGRAM_PRELUDE_H_
  #define COMPILER_TRANSLATOR_WGSL_WGSL_PROGRAM_PRELUDE_H_
  
  #include "compiler/translator/ImmutableString.h"
  #include "compiler/translator/InfoSink.h"
  #include "compiler/translator/IntermNode.h"
  namespace sh
  {
  struct WGSLWrapperFunction
  {
      ImmutableString prefix;
      ImmutableString suffix;
  };
  
  class WGSLProgramPrelude
  {
    public:
      WGSLWrapperFunction preIncrement(const TType &preIncrementedType);
      WGSLWrapperFunction preDecrement(const TType &preDecrementedType);
      WGSLWrapperFunction postIncrement(const TType &postIncrementedType);
      WGSLWrapperFunction postDecrement(const TType &postDecrementedType);
  
      void outputPrelude(TInfoSinkBase &sink);
  
    private:
      TSet<TType> mPreIncrementedTypes;
      TSet<TType> mPreDecrementedTypes;
      TSet<TType> mPostIncrementedTypes;
      TSet<TType> mPostDecrementedTypes;
  };
  }  // namespace sh
  
  #endif  // COMPILER_TRANSLATOR_WGSL_WGSL_PROGRAM_PRELUDE_H_
  

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