kc3-lang/angle/src/compiler/translator/tree_ops/vulkan/RewriteR32fImages.h

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• Hash : ea71c6b6
  Author :
  Date : 2021-01-12T14:13:35
  

  Vulkan: Emulate R32F images with R32UI
  
  GL requires that imageAtomicExchange be supported for r32f formats.
  However VK_FORMAT_FEATURE_STORAGE_*_ATOMIC_BIT is nearly unsupported
  everywhere without some Vulkan extension that brings in unnecessary
  support.
  
  This GL feature is emulated by transforming the shader to use r32ui for
  all images that originally specified r32f.  floatToUintBits and
  uintBitsToFloat is used to maintain correct usage of the image* builtin
  functions.
  
  Bug: angleproject:5535
  Change-Id: Ie607089935d3283b3ffa054f4b4385b81fb8f53d
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2635453
  Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  Reviewed-by: Tim Van Patten <timvp@google.com>
  

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• src/compiler/translator/tree_ops/vulkan/RewriteR32fImages.h

• //
  // Copyright 2021 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.
  //
  // RewriteR32fImages: Change images qualified with r32f to use r32ui instead.  The only supported
  // operation on these images is imageAtomicExchange(), which works identically with r32ui.  This
  // avoids requiring atomic operations support for the R32_FLOAT format in Vulkan.
  
  #ifndef COMPILER_TRANSLATOR_TREEOPS_VULKAN_REWRITER32FIMAGES_H_
  #define COMPILER_TRANSLATOR_TREEOPS_VULKAN_REWRITER32FIMAGES_H_
  
  #include "common/angleutils.h"
  
  namespace sh
  {
  class TCompiler;
  class TIntermBlock;
  class TSymbolTable;
  
  ANGLE_NO_DISCARD bool RewriteR32fImages(TCompiler *compiler,
                                          TIntermBlock *root,
                                          TSymbolTable *symbolTable);
  }  // namespace sh
  
  #endif  // COMPILER_TRANSLATOR_TREEOPS_VULKAN_REWRITER32FIMAGES_H_
  

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