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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
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tree10027f336435511475e392454359edea8e25895d /gfx/angle/src/third_party/compiler/ArrayBoundsClamper.cpp
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
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Add m-esr52 at 52.6.0
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+/*
+ * Copyright (C) 2012 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE, INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE, INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "third_party/compiler/ArrayBoundsClamper.h"
+
+// The built-in 'clamp' instruction only accepts floats and returns a float. I
+// iterated a few times with our driver team who examined the output from our
+// compiler - they said the multiple casts generates more code than a single
+// function call. An inline ternary operator might have been better, but since
+// the index value might be an expression itself, we'd have to make temporary
+// variables to avoid evaluating the expression multiple times. And making
+// temporary variables was difficult because ANGLE would then need to make more
+// brutal changes to the expression tree.
+
+const char* kIntClampBegin = "// BEGIN: Generated code for array bounds clamping\n\n";
+const char* kIntClampEnd = "// END: Generated code for array bounds clamping\n\n";
+const char* kIntClampDefinition = "int webgl_int_clamp(int value, int minValue, int maxValue) { return ((value < minValue) ? minValue : ((value > maxValue) ? maxValue : value)); }\n\n";
+
+namespace sh
+{
+
+namespace
+{
+
+class ArrayBoundsClamperMarker : public TIntermTraverser {
+public:
+ ArrayBoundsClamperMarker()
+ : TIntermTraverser(true, false, false),
+ mNeedsClamp(false)
+ {
+ }
+
+ bool visitBinary(Visit visit, TIntermBinary *node) override
+ {
+ if (node->getOp() == EOpIndexIndirect)
+ {
+ TIntermTyped* left = node->getLeft();
+ if (left->isArray() || left->isVector() || left->isMatrix())
+ {
+ node->setAddIndexClamp();
+ mNeedsClamp = true;
+ }
+ }
+ return true;
+ }
+
+ bool GetNeedsClamp() { return mNeedsClamp; }
+
+private:
+ bool mNeedsClamp;
+};
+
+} // anonymous namespace
+
+ArrayBoundsClamper::ArrayBoundsClamper()
+ : mClampingStrategy(SH_CLAMP_WITH_CLAMP_INTRINSIC)
+ , mArrayBoundsClampDefinitionNeeded(false)
+{
+}
+
+void ArrayBoundsClamper::SetClampingStrategy(ShArrayIndexClampingStrategy clampingStrategy)
+{
+ mClampingStrategy = clampingStrategy;
+}
+
+void ArrayBoundsClamper::MarkIndirectArrayBoundsForClamping(TIntermNode* root)
+{
+ ASSERT(root);
+
+ ArrayBoundsClamperMarker clamper;
+ root->traverse(&clamper);
+ if (clamper.GetNeedsClamp())
+ {
+ SetArrayBoundsClampDefinitionNeeded();
+ }
+}
+
+void ArrayBoundsClamper::OutputClampingFunctionDefinition(TInfoSinkBase& out) const
+{
+ if (!mArrayBoundsClampDefinitionNeeded)
+ {
+ return;
+ }
+ if (mClampingStrategy != SH_CLAMP_WITH_USER_DEFINED_INT_CLAMP_FUNCTION)
+ {
+ return;
+ }
+ out << kIntClampBegin << kIntClampDefinition << kIntClampEnd;
+}
+
+} // namespace sh