Hash :
32e97315
Author :
Date :
2011-08-24T01:03:11
Emulate certain buil-in functions to work around driver bugs. This is implemented by adding a new compile option SH_EMULATE_BUILT_IN_FUNCTIONS. The emulated functions are names as webgl_originalName_emu so there will never be naming conflicts. At the moment only three functions are emulated: normalize, abs, sign. Also, the compile option will emulate all three. However, the mechanism to emulate only a selected subset is also imeplemented. It can be turned on easily. ANGLEBUG=196 TEST=with this option, the failed test with abs.frag passes. Review URL: http://codereview.appspot.com/4916043 git-svn-id: https://angleproject.googlecode.com/svn/trunk@738 736b8ea6-26fd-11df-bfd4-992fa37f6226
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//
// Copyright (c) 2002-2011 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.
//
#include "compiler/TranslatorESSL.h"
#include "compiler/OutputESSL.h"
TranslatorESSL::TranslatorESSL(ShShaderType type, ShShaderSpec spec)
: TCompiler(type, spec) {
}
void TranslatorESSL::translate(TIntermNode* root) {
TInfoSinkBase& sink = getInfoSink().obj;
// Write built-in extension behaviors.
writeExtensionBehavior();
// Write emulated built-in functions if needed.
getBuiltInFunctionEmulator().OutputEmulatedFunctionDefinition(
sink, getShaderType() == SH_FRAGMENT_SHADER);
// Write translated shader.
TOutputESSL outputESSL(sink);
root->traverse(&outputESSL);
}
void TranslatorESSL::writeExtensionBehavior() {
TInfoSinkBase& sink = getInfoSink().obj;
const TExtensionBehavior& extensionBehavior = getExtensionBehavior();
for (TExtensionBehavior::const_iterator iter = extensionBehavior.begin();
iter != extensionBehavior.end(); ++iter) {
if (iter->second != EBhUndefined) {
sink << "#extension " << iter->first << " : "
<< getBehaviorString(iter->second) << "\n";
}
}
}