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      1 /*
      2  * Copyright (C) 2012 Apple Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE, INC. ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE, INC. OR
     17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #ifndef THIRD_PARTY_COMPILER_ARRAY_BOUNDS_CLAMPER_H_
     27 #define THIRD_PARTY_COMPILER_ARRAY_BOUNDS_CLAMPER_H_
     28 
     29 #include "compiler/translator/InfoSink.h"
     30 #include "compiler/translator/IntermNode.h"
     31 
     32 class ArrayBoundsClamper {
     33 public:
     34     ArrayBoundsClamper();
     35 
     36     // Must be set before compiling any shaders to ensure consistency
     37     // between the translated shaders and any necessary prequel.
     38     void SetClampingStrategy(ShArrayIndexClampingStrategy clampingStrategy);
     39 
     40     // Marks nodes in the tree that index arrays indirectly as
     41     // requiring clamping.
     42     void MarkIndirectArrayBoundsForClamping(TIntermNode* root);
     43 
     44     // If necessary, output array clamp function source into the shader source.
     45     void OutputClampingFunctionDefinition(TInfoSinkBase& out) const;
     46 
     47     void Cleanup()
     48     {
     49         mArrayBoundsClampDefinitionNeeded = false;
     50     }
     51 
     52 private:
     53     bool GetArrayBoundsClampDefinitionNeeded() const { return mArrayBoundsClampDefinitionNeeded; }
     54     void SetArrayBoundsClampDefinitionNeeded() { mArrayBoundsClampDefinitionNeeded = true; }
     55 
     56     ShArrayIndexClampingStrategy mClampingStrategy;
     57     bool mArrayBoundsClampDefinitionNeeded;
     58 };
     59 
     60 #endif // THIRD_PARTY_COMPILER_ARRAY_BOUNDS_CLAMPER_H_
     61