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

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• Hash : e72cc71b
  Author :
  Date : 2024-12-13T11:59:29
  

  Vulkan: Remove framebuffer fetch from shader if unused
  
  Some application shaders may use `inout` variables to simplify shader
  generation (presumably), but in the end don't actually ever read from
  those variables.
  
  This change tries to detect some very simple but common cases where it's
  clear that the shader completely overwrites the variable without reading
  from it and turns `inout` into `out`.  When coherent framebuffer fetch
  emulation kicks in, these shaders would no longer cause unnecessary
  barriers.
  
  Bug: angleproject:377923479
  Change-Id: I0970b72f551b24409337a375cf97aa63bb511fb5
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/6094425
  Reviewed-by: Charlie Lao <cclao@google.com>
  Commit-Queue: Roman Lavrov <romanl@google.com>
  Auto-Submit: Shahbaz Youssefi <syoussefi@chromium.org>
  Reviewed-by: Roman Lavrov <romanl@google.com>
  

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

• //
  // Copyright 2024 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.
  //
  // RemoveUnusedFramebufferFetch.h:
  //   If the shader declares |inout| variables but only ever assigns to all their channels, the
  //   variable is turned into a regular |out| variable.
  
  #ifndef COMPILER_TRANSLATOR_TREEOPS_REMOVEUNUSEDFRAMEBUFFERFETCH_H_
  #define COMPILER_TRANSLATOR_TREEOPS_REMOVEUNUSEDFRAMEBUFFERFETCH_H_
  
  #include "common/angleutils.h"
  
  namespace sh
  {
  
  class TCompiler;
  class TIntermBlock;
  class TSymbolTable;
  
  [[nodiscard]] bool RemoveUnusedFramebufferFetch(TCompiler *compiler,
                                                  TIntermBlock *root,
                                                  TSymbolTable *symbolTable);
  
  }  // namespace sh
  
  #endif  // COMPILER_TRANSLATOR_TREEOPS_REMOVEUNUSEDFRAMEBUFFERFETCH_H_
  

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