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//
// Copyright (c) 2015 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.
//
// ExtensionGLSL.cpp: Implements the TExtensionGLSL class that tracks GLSL extension requirements
// of shaders.
#include "compiler/translator/ExtensionGLSL.h"
#include "compiler/translator/VersionGLSL.h"
TExtensionGLSL::TExtensionGLSL(ShShaderOutput output)
: TIntermTraverser(true, false, false), mTargetVersion(ShaderOutputTypeToGLSLVersion(output))
{
}
const std::set<std::string> &TExtensionGLSL::getEnabledExtensions() const
{
return mEnabledExtensions;
}
const std::set<std::string> &TExtensionGLSL::getRequiredExtensions() const
{
return mRequiredExtensions;
}
bool TExtensionGLSL::visitUnary(Visit, TIntermUnary *node)
{
checkOperator(node);
return true;
}
bool TExtensionGLSL::visitAggregate(Visit, TIntermAggregate *node)
{
checkOperator(node);
return true;
}
void TExtensionGLSL::checkOperator(TIntermOperator *node)
{
if (mTargetVersion < GLSL_VERSION_130)
{
return;
}
switch (node->getOp())
{
case EOpAbs:
break;
case EOpSign:
break;
case EOpMix:
break;
case EOpFloatBitsToInt:
case EOpFloatBitsToUint:
case EOpIntBitsToFloat:
case EOpUintBitsToFloat:
if (mTargetVersion < GLSL_VERSION_330)
{
// Bit conversion functions cannot be emulated.
mRequiredExtensions.insert("GL_ARB_shader_bit_encoding");
}
break;
case EOpPackSnorm2x16:
case EOpPackHalf2x16:
case EOpUnpackSnorm2x16:
case EOpUnpackHalf2x16:
if (mTargetVersion < GLSL_VERSION_420)
{
mEnabledExtensions.insert("GL_ARB_shading_language_packing");
if (mTargetVersion < GLSL_VERSION_330)
{
// floatBitsToUint and uintBitsToFloat are needed to emulate
// packHalf2x16 and unpackHalf2x16 respectively and cannot be
// emulated themselves.
mRequiredExtensions.insert("GL_ARB_shader_bit_encoding");
}
}
break;
case EOpPackUnorm2x16:
case EOpUnpackUnorm2x16:
if (mTargetVersion < GLSL_VERSION_410)
{
mEnabledExtensions.insert("GL_ARB_shading_language_packing");
}
break;
default:
break;
}
}
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