kc3-lang/angle/src/compiler/translator/tree_util/ReplaceClipDistanceVariable.h

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• Hash : dadd1986
  Author :
  Date : 2020-04-21T01:50:00
  

  Implement GL_APPLE_clip_distance
  
  - Built-in variable gl_ClipDistance has been added to compiler.
  - Desktop GL: gl_ClipDistance is supported since GL 3.0. Enable/Disable
  each gl_ClipDistances[i] works out of the box via glEnable().
  - Vulkan/Metal: Use uniform variable to control writing to each
  gl_ClipDistance. One bit flag controls one element in the gl_ClipDistance
  array. The writing to the disabled element in vertex shader will be
  ignored, and turned into zero assignment instead.
  - Direct3D/Mobile GL: Not implemented yet.
  - Added ClipDistanceTest to gl_tests and compiler unittests.
  - GL_APPLE_clip_distance is a subset of GL_EXT_clip_cull_distance, so
  GL_EXT_clip_cull_distance could be implemented in future if needed.
  
  Bug: angleproject:4452
  Change-Id: I571ac8b56826989808a680226a04bec4cf59988e
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2084324
  Commit-Queue: Jamie Madill <jmadill@chromium.org>
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  

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• src/compiler/translator/tree_util/ReplaceClipDistanceVariable.h

• //
  // Copyright 2020 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.
  //
  // ReplaceClipDistanceVariable.h: Find any references to gl_ClipDistance and
  // replace it with ANGLEClipDistance.
  //
  
  #ifndef COMPILER_TRANSLATOR_TREEUTIL_REPLACECLIPDISTANCEVARIABLE_H_
  #define COMPILER_TRANSLATOR_TREEUTIL_REPLACECLIPDISTANCEVARIABLE_H_
  
  #include "common/angleutils.h"
  
  namespace sh
  {
  
  class TCompiler;
  class TIntermBlock;
  class TSymbolTable;
  class TIntermTyped;
  
  // Replace every gl_ClipDistance assignment with assignment to "ANGLEClipDistance",
  // then at the end of shader re-assign the values of this global variable to gl_ClipDistance.
  // This to solve some complex usages such as user passing gl_ClipDistance as output reference
  // to a function.
  // Furthermore, at the end shader, some disabled gl_ClipDistance[i] can be skipped from the
  // assignment.
  ANGLE_NO_DISCARD bool ReplaceClipDistanceAssignments(TCompiler *compiler,
                                                       TIntermBlock *root,
                                                       TSymbolTable *symbolTable,
                                                       const TIntermTyped *clipDistanceEnableFlags);
  }  // namespace sh
  
  #endif

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