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

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• Hash : 705a9194
  Author :
  Date : 2016-08-29T10:05:27
  

  Reland "Remove invariant qualifier for input in fragment shader"
  
  This relands https://chromium-review.googlesource.com/#/c/400005/.
  
  ESSL and GLSL are not consistent on invariant matching in vertex shader
  and fragment shader. See the following rules:
  ESSL 1.00 - input and output must match
  ESSL 3.00 - only output, inputs cannot be declared as invariant.
  
  GLSL 1.10.59 - does not exist
  GLSL 1.20.8  - input and output must match
  GLSL 1.30.10 - input and output must match
  GLSL 1.40.8  - input and output must match
  GLSL 1.50.11 - input and output must match
  GLSL 3.30.6  - input and output must match
  GLSL 4.00.9  - input and output must match
  GLSL 4.10.6  - input and output must match
  GLSL 4.20.11 - input can omit invariant
  GLSL 4.30.8  - input can omit invariant
  GLSL 4.40.9  - input can omit invariant
  GLSL 4.50.5  - input can omit invariant
  
  Since GLSL 4.20, invariant qualifier description were changed to:
  "
  Only variables output from a shader (including those that are then input
  to a subsequent shader) can be candidates for invariance. This includes
  user-defined output variables and the built-in output variables. As only
  outputs need be declared with invariant, an output from one shader stage
  will still match an input of a subsequent stage without the input being
  declared as invariant.
  "
  It's not very clear if input in fragment can be declared as invariant.
  Mesa driver disallows use of input declared as invariant in fragment
  shader, while other drivers may allow it. This CL removes invariant
  declaration for input in fragment shader except AMD driver in Linux.
  AMD's driver obviously contradicts the spec by forcing invariance to
  match between vertex and fragment shaders.
  
  BUG=chromium:639760, chromium:659326
  TEST=conformance/glsl/misc/shaders-with-invariance.html and
  conformance/glsl/bugs/invariant-does-not-leak-across-shaders.html
  
  Change-Id: I0aa9be14f0cee7a11a249c91fba27c570c52ca1b
  Reviewed-on: https://chromium-review.googlesource.com/404228
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  Commit-Queue: Yuly Novikov <ynovikov@chromium.org>
  

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• src/compiler/translator/RemoveInvariantDeclaration.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.
  //
  
  #ifndef COMPILER_TRANSLATOR_REMOVEINVARIANTDECLARATION_H_
  #define COMPILER_TRANSLATOR_REMOVEINVARIANTDECLARATION_H_
  
  class TIntermNode;
  namespace sh
  {
  
  void RemoveInvariantDeclaration(TIntermNode *root);
  
  }  // namespace sh
  
  #endif  // COMPILER_TRANSLATOR_REMOVEINVARIANTDECLARATION_H_
  

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