kc3-lang/angle/src/compiler/translator/tree_ops/ClampFragDepth.cpp

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• Author : Clemen Deng
  Date : 2019-08-21 15:22:49
  Hash : d7d42540
  Message : Don't build symbol table for GLSL built-ins if on Android The GLSL + ESSL autogenerated symbol table is too large for android, and android also doesn't need desktop GL functionality If on android, compile the ESSL only symbol table Bug: chromium:996286 Change-Id: I14dfc7748dae389e78c35f82a390c67962665356 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1757372 Commit-Queue: Clemen Deng <clemendeng@google.com> Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org>

• src/compiler/translator/tree_ops/ClampFragDepth.cpp

• //
  // Copyright 2017 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.
  //
  // ClampFragDepth.cpp: Limit the value that is written to gl_FragDepth to the range [0.0, 1.0].
  // The clamping is run at the very end of shader execution, and is only performed if the shader
  // statically accesses gl_FragDepth.
  //
  
  #include "compiler/translator/tree_ops/ClampFragDepth.h"
  
  #include "compiler/translator/ImmutableString.h"
  #include "compiler/translator/SymbolTable.h"
  #include "compiler/translator/tree_util/BuiltIn.h"
  #include "compiler/translator/tree_util/FindSymbolNode.h"
  #include "compiler/translator/tree_util/IntermNode_util.h"
  #include "compiler/translator/tree_util/RunAtTheEndOfShader.h"
  
  namespace sh
  {
  
  bool ClampFragDepth(TCompiler *compiler, TIntermBlock *root, TSymbolTable *symbolTable)
  {
      // Only clamp gl_FragDepth if it's used in the shader.
      if (!FindSymbolNode(root, ImmutableString("gl_FragDepth")))
      {
          return true;
      }
  
      TIntermSymbol *fragDepthNode = new TIntermSymbol(BuiltInVariable::gl_FragDepth());
  
      TIntermTyped *minFragDepthNode = CreateZeroNode(TType(EbtFloat, EbpHigh, EvqConst));
  
      TConstantUnion *maxFragDepthConstant = new TConstantUnion();
      maxFragDepthConstant->setFConst(1.0);
      TIntermConstantUnion *maxFragDepthNode =
          new TIntermConstantUnion(maxFragDepthConstant, TType(EbtFloat, EbpHigh, EvqConst));
  
      // clamp(gl_FragDepth, 0.0, 1.0)
      TIntermSequence *clampArguments = new TIntermSequence();
      clampArguments->push_back(fragDepthNode->deepCopy());
      clampArguments->push_back(minFragDepthNode);
      clampArguments->push_back(maxFragDepthNode);
      TIntermTyped *clampedFragDepth =
          CreateBuiltInFunctionCallNode("clamp", clampArguments, *symbolTable, 100);
  
      // gl_FragDepth = clamp(gl_FragDepth, 0.0, 1.0)
      TIntermBinary *assignFragDepth = new TIntermBinary(EOpAssign, fragDepthNode, clampedFragDepth);
  
      return RunAtTheEndOfShader(compiler, root, assignFragDepth, symbolTable);
  }
  
  }  // namespace sh