kc3-lang/angle/src/compiler/translator/tree_ops/RewriteStructSamplers.h

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• Hash : 0cdbc781
  Author :
  Date : 2025-03-06T11:22:18
  

  WGSL: Output samplers, including samplers from structs
  
  This output two WGSL variables for each GLSL sampler, including samplers
  in structs. This does not output the correct types for the WGSL
  variables, yet, nor does it generate texture access function calls.
  It also can't deal with arrays of samplers, which are not allowed in
  WGSL.
  
  Note that WGSL does not allow structs containing samplers to be
  arguments to a function, like Vulkan, nor does it allowed arrays of
  samplers at all, unlike Vulkan. This deals with the former problem the
  same way as Vulkan and Metal, by monomorphizing functions that take
  unsupported arguments.
  
  Bug: angleproject:389145696
  Change-Id: I346688783dd2771c8fe6848b6783d948ed111783
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/6253672
  Reviewed-by: Geoff Lang <geofflang@chromium.org>
  Commit-Queue: Matthew Denton <mpdenton@chromium.org>
  

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• src/compiler/translator/tree_ops/RewriteStructSamplers.h

• //
  // Copyright 2018 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.
  //
  // RewriteStructSamplers: Extract structs from samplers.
  //
  // This traverser is designed to strip out samplers from structs. It moves them into separate
  // uniform sampler declarations. This allows the struct to be stored in the default uniform block.
  // This transformation requires MonomorphizeUnsupportedFunctions to have been run so it
  // wouldn't need to deal with functions that are passed such structs.
  //
  // For example:
  //   struct S { sampler2D samp; int i; };
  //   uniform S uni;
  // Is rewritten as:
  //   struct S { int i; };
  //   uniform S uni;
  //   uniform sampler2D uni_i;
  
  #ifndef COMPILER_TRANSLATOR_TREEOPS_REWRITESTRUCTSAMPLERS_H_
  #define COMPILER_TRANSLATOR_TREEOPS_REWRITESTRUCTSAMPLERS_H_
  
  #include "common/angleutils.h"
  
  namespace sh
  {
  class TCompiler;
  class TIntermBlock;
  class TSymbolTable;
  
  bool RewriteStructSamplers(TCompiler *compiler,
                             TIntermBlock *root,
                             TSymbolTable *symbolTable,
                             int *removedUniformsCountOut);
  }  // namespace sh
  
  #endif  // COMPILER_TRANSLATOR_TREEOPS_REWRITESTRUCTSAMPLERS_H_
  

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