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

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• Hash : 3766a40d
  Author :
  Date : 2015-06-18T15:47:46
  

  Remove dynamic indexing of matrices and vectors in HLSL
  
  Re-landing after fixing D3D9 specific issues.
  
  HLSL doesn't support dynamic indexing of matrices and vectors, so replace
  that with helper functions that unroll dynamic indexing into switch/case
  and static indexing.
  
  Both the indexed vector/matrix expression and the index may have side
  effects, and these will be evaluated correctly. If necessary, index
  expressions that have side effects will be written to a temporary
  variable that will replace the index.
  
  Besides dEQP tests, this change is tested by a WebGL 2 conformance test.
  
  In the case that a dynamic index is out-of-range, the base ESSL 3.00 spec
  allows undefined behavior. KHR_robust_buffer_access_behavior adds the
  requirement that program termination should not occur and that
  out-of-range reads must return either a value from the active program's
  memory or zero, and out-of-range writes should only affect the active
  program's memory or do nothing. This patch clamps out-of-range indices so
  that either the first or last item of the matrix/vector is accessed.
  
  The code is not transformed in case the it fits within the limited subset
  of ESSL 1.00 given in Appendix A of the spec. If the code isn't within
  the restricted subset, even ESSL 1.00 shaders may require this
  workaround.
  
  BUG=angleproject:1116
  TEST=dEQP-GLES3.functional.shaders.indexing.* (all pass after change)
       WebGL 2 conformance tests (glsl3/vector-dynamic-indexing.html)
  
  Change-Id: I66a5e5a8d7f4267da0045f1cc2ba6b0dc7eb3f5d
  Reviewed-on: https://chromium-review.googlesource.com/296671
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  Tryjob-Request: Jamie Madill <jmadill@chromium.org>
  Tested-by: Jamie Madill <jmadill@chromium.org>
  Reviewed-by: Zhenyao Mo <zmo@chromium.org>
  

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• src/compiler/translator/RemoveDynamicIndexing.h

• //
  // Copyright (c) 2002-2015 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.
  //
  // RemoveDynamicIndexing is an AST traverser to remove dynamic indexing of vectors and matrices,
  // replacing them with calls to functions that choose which component to return or write.
  //
  
  #ifndef COMPILER_TRANSLATOR_REMOVEDYNAMICINDEXING_H_
  #define COMPILER_TRANSLATOR_REMOVEDYNAMICINDEXING_H_
  
  class TIntermNode;
  class TSymbolTable;
  
  void RemoveDynamicIndexing(TIntermNode *root,
                             unsigned int *temporaryIndex,
                             const TSymbolTable &symbolTable,
                             int shaderVersion);
  
  #endif  // COMPILER_TRANSLATOR_REMOVEDYNAMICINDEXING_H_
  

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