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//
// Copyright (c) 2002-2012 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/VersionGLSL.h"
static const int GLSL_VERSION_110 = 110;
static const int GLSL_VERSION_120 = 120;
static const int GLSL_VERSION_130 = 130;
static const int GLSL_VERSION_410 = 410;
static const int GLSL_VERSION_420 = 420;
// We need to scan for the following:
// 1. "invariant" keyword: This can occur in both - vertex and fragment shaders
// but only at the global scope.
// 2. "gl_PointCoord" built-in variable: This can only occur in fragment shader
// but inside any scope.
// 3. Call to a matrix constructor with another matrix as argument.
// (These constructors were reserved in GLSL version 1.10.)
// 4. Arrays as "out" function parameters.
// GLSL spec section 6.1.1: "When calling a function, expressions that do
// not evaluate to l-values cannot be passed to parameters declared as
// out or inout."
// GLSL 1.1 section 5.8: "Other binary or unary expressions,
// non-dereferenced arrays, function names, swizzles with repeated fields,
// and constants cannot be l-values."
// GLSL 1.2 relaxed the restriction on arrays, section 5.8: "Variables that
// are built-in types, entire structures or arrays... are all l-values."
//
TVersionGLSL::TVersionGLSL(sh::GLenum type,
const TPragma &pragma,
ShShaderOutput output)
{
if (output == SH_GLSL_130_OUTPUT)
{
mVersion = GLSL_VERSION_130;
}
else if (output == SH_GLSL_410_CORE_OUTPUT)
{
mVersion = GLSL_VERSION_410;
}
else if (output == SH_GLSL_420_CORE_OUTPUT)
{
mVersion = GLSL_VERSION_420;
}
else
{
ASSERT(output == SH_GLSL_COMPATIBILITY_OUTPUT);
if (pragma.stdgl.invariantAll)
mVersion = GLSL_VERSION_120;
else
mVersion = GLSL_VERSION_110;
}
}
void TVersionGLSL::visitSymbol(TIntermSymbol *node)
{
if (node->getSymbol() == "gl_PointCoord")
updateVersion(GLSL_VERSION_120);
}
bool TVersionGLSL::visitAggregate(Visit, TIntermAggregate *node)
{
bool visitChildren = true;
switch (node->getOp())
{
case EOpSequence:
// We need to visit sequence children to get to global or inner scope.
visitChildren = true;
break;
case EOpDeclaration:
{
const TIntermSequence &sequence = *(node->getSequence());
TQualifier qualifier = sequence.front()->getAsTyped()->getQualifier();
if ((qualifier == EvqInvariantVaryingIn) ||
(qualifier == EvqInvariantVaryingOut))
{
updateVersion(GLSL_VERSION_120);
}
break;
}
case EOpInvariantDeclaration:
updateVersion(GLSL_VERSION_120);
break;
case EOpParameters:
{
const TIntermSequence ¶ms = *(node->getSequence());
for (TIntermSequence::const_iterator iter = params.begin();
iter != params.end(); ++iter)
{
const TIntermTyped *param = (*iter)->getAsTyped();
if (param->isArray())
{
TQualifier qualifier = param->getQualifier();
if ((qualifier == EvqOut) || (qualifier == EvqInOut))
{
updateVersion(GLSL_VERSION_120);
break;
}
}
}
// Fully processed. No need to visit children.
visitChildren = false;
break;
}
case EOpConstructMat2:
case EOpConstructMat3:
case EOpConstructMat4:
{
const TIntermSequence &sequence = *(node->getSequence());
if (sequence.size() == 1)
{
TIntermTyped *typed = sequence.front()->getAsTyped();
if (typed && typed->isMatrix())
{
updateVersion(GLSL_VERSION_120);
}
}
break;
}
default:
break;
}
return visitChildren;
}
void TVersionGLSL::updateVersion(int version)
{
mVersion = std::max(version, mVersion);
}
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