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//
// Copyright (c) 2002-2013 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/translator/TranslatorGLSL.h"
#include "compiler/translator/OutputGLSL.h"
#include "compiler/translator/VersionGLSL.h"
TranslatorGLSL::TranslatorGLSL(sh::GLenum type, ShShaderSpec spec)
: TCompiler(type, spec, SH_GLSL_OUTPUT) {
}
void TranslatorGLSL::translate(TIntermNode* root) {
TInfoSinkBase& sink = getInfoSink().obj;
// Write GLSL version.
writeVersion(root);
writePragma();
// Write extension behaviour as needed
writeExtensionBehavior();
// Write emulated built-in functions if needed.
getBuiltInFunctionEmulator().OutputEmulatedFunctionDefinition(
sink, false);
// Write array bounds clamping emulation if needed.
getArrayBoundsClamper().OutputClampingFunctionDefinition(sink);
// Write translated shader.
TOutputGLSL outputGLSL(sink, getArrayIndexClampingStrategy(), getHashFunction(), getNameMap(), getSymbolTable(), getShaderVersion());
root->traverse(&outputGLSL);
}
void TranslatorGLSL::writeVersion(TIntermNode *root)
{
TVersionGLSL versionGLSL(getShaderType(), getPragma());
root->traverse(&versionGLSL);
int version = versionGLSL.getVersion();
// We need to write version directive only if it is greater than 110.
// If there is no version directive in the shader, 110 is implied.
if (version > 110)
{
TInfoSinkBase& sink = getInfoSink().obj;
sink << "#version " << version << "\n";
}
}
void TranslatorGLSL::writeExtensionBehavior() {
TInfoSinkBase& sink = getInfoSink().obj;
const TExtensionBehavior& extensionBehavior = getExtensionBehavior();
for (TExtensionBehavior::const_iterator iter = extensionBehavior.begin();
iter != extensionBehavior.end(); ++iter) {
if (iter->second == EBhUndefined)
continue;
// For GLSL output, we don't need to emit most extensions explicitly,
// but some we need to translate.
if (iter->first == "GL_EXT_shader_texture_lod") {
sink << "#extension GL_ARB_shader_texture_lod : "
<< getBehaviorString(iter->second) << "\n";
}
}
}
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