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

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• Hash : b3070102
  Author :
  Date : 2019-10-18T16:01:34
  

  Add SH_REMOVE_DYNAMIC_INDEXING_OF_SWIZZLED_VECTOR
  
  This is a workaround for the webgl2 conformance test case
  WebglConformance_conformance2_glsl3_vector_dynamic_indexing_swizzled_lvalue.
  Dynamic indexing of swizzled lvalue like "v.zyx[i] = 0.0" is problematic on
  various platforms. This removes the indexing by translating it this way:
  
  void dyn_index_write_vec3(inout vec3 base, in int index, in float value){
    switch (index) {
      case (0):
        (base[0] = value);
        return ;
      case (1):
        (base[1] = value);
        return ;
      case (2):
        (base[2] = value);
        return ;
      default:
        break;
    }
    if ((index < 0))
    {
      (base[0] = value);
      return ;
    }
    {
      (base[2] = value);
    }
  }
  
  ...
  dyn_index_write_vec3(v.zyx, i, 0.0);
  ...
  
  Bug: chromium:709351
  Change-Id: I971b38eb404209b56e6764af1063878c078a7e88
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1869109
  Commit-Queue: Jie A Chen <jie.a.chen@intel.com>
  Reviewed-by: Geoff Lang <geofflang@chromium.org>
  

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• src/compiler/translator/tree_ops/RemoveDynamicIndexing.h

• //
  // Copyright 2002 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 non-SSBO vectors and
  // matrices, replacing them with calls to functions that choose which component to return or write.
  // We don't need to consider dynamic indexing in SSBO since it can be directly as part of the offset
  // of RWByteAddressBuffer.
  //
  
  #ifndef COMPILER_TRANSLATOR_TREEOPS_REMOVEDYNAMICINDEXING_H_
  #define COMPILER_TRANSLATOR_TREEOPS_REMOVEDYNAMICINDEXING_H_
  
  #include "common/angleutils.h"
  
  #include <functional>
  
  namespace sh
  {
  
  class TCompiler;
  class TIntermNode;
  class TIntermBinary;
  class TSymbolTable;
  class PerformanceDiagnostics;
  
  ANGLE_NO_DISCARD bool RemoveDynamicIndexingOfNonSSBOVectorOrMatrix(
      TCompiler *compiler,
      TIntermNode *root,
      TSymbolTable *symbolTable,
      PerformanceDiagnostics *perfDiagnostics);
  
  ANGLE_NO_DISCARD bool RemoveDynamicIndexingOfSwizzledVector(
      TCompiler *compiler,
      TIntermNode *root,
      TSymbolTable *symbolTable,
      PerformanceDiagnostics *perfDiagnostics);
  
  }  // namespace sh
  
  #endif  // COMPILER_TRANSLATOR_TREEOPS_REMOVEDYNAMICINDEXING_H_
  

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