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

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• Hash : da9fb093
  Author :
  Date : 2016-12-09T17:32:29
  

  Work around atan(y, x) bug on NVIDIA
  
  atan(y, x) is not always returning expected results on NVIDIA OpenGL
  drivers between versions 367 and 375. Work around this by emulating
  atan(y, x) using the regular atan(x) function. A fix to the driver is
  expected in a future release.
  
  It is most convenient to implement the vector atan(y, x) functions by
  using the scalar atan(y, x) function. Support for simple dependencies
  between emulated functions is added to BuiltInFunctionEmulator. In the
  current implementation one function is allowed to have at most one
  other function as its dependency.
  
  BUG=chromium:672380
  TEST=angle_end2end_tests
  
  Change-Id: I9eba8b0b7979c7c7eaed353b264932e41830beb1
  Reviewed-on: https://chromium-review.googlesource.com/419016
  Commit-Queue: Olli Etuaho <oetuaho@nvidia.com>
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  

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• src/compiler/translator/BuiltInFunctionEmulatorGLSL.h

• //
  // Copyright (c) 2011 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_BUILTINFUNCTIONEMULATORGLSL_H_
  #define COMPILER_TRANSLATOR_BUILTINFUNCTIONEMULATORGLSL_H_
  
  #include "GLSLANG/ShaderLang.h"
  
  namespace sh
  {
  class BuiltInFunctionEmulator;
  
  //
  // This works around bug in Intel Mac drivers.
  //
  void InitBuiltInAbsFunctionEmulatorForGLSLWorkarounds(BuiltInFunctionEmulator *emu,
                                                        sh::GLenum shaderType);
  
  //
  // This works around isnan() bug in Intel Mac drivers
  //
  void InitBuiltInIsnanFunctionEmulatorForGLSLWorkarounds(BuiltInFunctionEmulator *emu,
                                                          int targetGLSLVersion);
  //
  // This works around atan(y, x) bug in NVIDIA drivers.
  //
  void InitBuiltInAtanFunctionEmulatorForGLSLWorkarounds(BuiltInFunctionEmulator *emu);
  
  //
  // This function is emulating built-in functions missing from GLSL 1.30 and higher.
  //
  void InitBuiltInFunctionEmulatorForGLSLMissingFunctions(BuiltInFunctionEmulator *emu,
                                                          sh::GLenum shaderType,
                                                          int targetGLSLVersion);
  }  // namespace sh
  
  #endif  // COMPILER_TRANSLATOR_BUILTINFUNCTIONEMULATORGLSL_H_
  

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