kc3-lang/angle/src/compiler/translator/RewriteTexelFetchOffset.h

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• Hash : 11e43ece
  Author :
  Date : 2016-08-11T09:54:08
  

  Add a workaround for Intel drivers on glsl function texelfetchoffset
  
  GLSL function texelfetchoffset will be translated into texture.Load in
  ANGLE. In D3D there is a note that When one or more of the coordinates
  in Location exceeds the u, v, or w mipmap level dimensions of the
  texture, Load returns zero in all components, but in glsl there is no
  such restriction, which will cause the WebGL 2 dEQP test
  deqp/functional/gles3/shadertexturefunction/texelfetchoffset.html fail
  on Windows with Intel GPU.
  
  Adapted from ExpandIntegerPowExpressions.cpp, this patch adds a
  translation from texelFetchOffset into texelFetch to work around this
  issue.
  
  BUG=angleproject:1469
  
  Change-Id: Iecfb9570472036acf5960789bdb1a63f191316be
  Reviewed-on: https://chromium-review.googlesource.com/367883
  Commit-Queue: Jamie Madill <jmadill@chromium.org>
  Reviewed-by: Corentin Wallez <cwallez@chromium.org>
  

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• src/compiler/translator/RewriteTexelFetchOffset.h

• //
  // Copyright (c) 2016 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.
  //
  // This mutating tree traversal works around an issue on the translation
  // from texelFetchOffset into HLSL function Load on INTEL drivers. It
  // works by translating texelFetchOffset into texelFetch:
  //
  // - From: texelFetchOffset(sampler, Position, lod, offset)
  // - To: texelFetch(sampler, Position+offset, lod)
  //
  // See http://anglebug.com/1469
  
  #ifndef COMPILER_TRANSLATOR_REWRITE_TEXELFETCHOFFSET_H_
  #define COMPILER_TRANSLATOR_REWRITE_TEXELFETCHOFFSET_H_
  
  class TIntermNode;
  class TSymbolTable;
  
  namespace sh
  {
  
  void RewriteTexelFetchOffset(TIntermNode *root,
                               unsigned int *tempIndex,
                               const TSymbolTable &symbolTable,
                               int shaderVersion);
  
  }  // namespace sh
  
  #endif  // COMPILER_TRANSLATOR_REWRITE_TEXELFETCHOFFSET_H_

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