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//
// Copyright 2002 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"
#include "angle_gl.h"
#include "compiler/translator/Symbol.h"
namespace sh
{
namespace
{
constexpr const ImmutableString kGlPointCoordString("gl_PointCoord");
} // anonymous namespace
int ShaderOutputTypeToGLSLVersion(ShShaderOutput output)
{
switch (output)
{
case SH_GLSL_130_OUTPUT:
return GLSL_VERSION_130;
case SH_GLSL_140_OUTPUT:
return GLSL_VERSION_140;
case SH_GLSL_150_CORE_OUTPUT:
return GLSL_VERSION_150;
case SH_GLSL_330_CORE_OUTPUT:
return GLSL_VERSION_330;
case SH_GLSL_400_CORE_OUTPUT:
return GLSL_VERSION_400;
case SH_GLSL_410_CORE_OUTPUT:
return GLSL_VERSION_410;
case SH_GLSL_420_CORE_OUTPUT:
return GLSL_VERSION_420;
case SH_GLSL_430_CORE_OUTPUT:
return GLSL_VERSION_430;
case SH_GLSL_440_CORE_OUTPUT:
return GLSL_VERSION_440;
case SH_GLSL_450_CORE_OUTPUT:
return GLSL_VERSION_450;
case SH_GLSL_COMPATIBILITY_OUTPUT:
return GLSL_VERSION_110;
default:
UNREACHABLE();
return 0;
}
}
// 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)
: TIntermTraverser(true, false, false)
{
mVersion = ShaderOutputTypeToGLSLVersion(output);
if (pragma.stdgl.invariantAll)
{
ensureVersionIsAtLeast(GLSL_VERSION_120);
}
if (type == GL_COMPUTE_SHADER)
{
ensureVersionIsAtLeast(GLSL_VERSION_430);
}
}
void TVersionGLSL::visitSymbol(TIntermSymbol *node)
{
if (node->variable().symbolType() == SymbolType::BuiltIn &&
node->getName() == kGlPointCoordString)
{
ensureVersionIsAtLeast(GLSL_VERSION_120);
}
}
bool TVersionGLSL::visitDeclaration(Visit, TIntermDeclaration *node)
{
const TIntermSequence &sequence = *(node->getSequence());
if (sequence.front()->getAsTyped()->getType().isInvariant())
{
ensureVersionIsAtLeast(GLSL_VERSION_120);
}
return true;
}
bool TVersionGLSL::visitGlobalQualifierDeclaration(Visit, TIntermGlobalQualifierDeclaration *node)
{
if (node->isPrecise())
{
ensureVersionIsAtLeast(GLSL_VERSION_420);
}
else
{
ensureVersionIsAtLeast(GLSL_VERSION_120);
}
return true;
}
void TVersionGLSL::visitFunctionPrototype(TIntermFunctionPrototype *node)
{
size_t paramCount = node->getFunction()->getParamCount();
for (size_t i = 0; i < paramCount; ++i)
{
const TVariable *param = node->getFunction()->getParam(i);
const TType &type = param->getType();
if (type.isArray())
{
TQualifier qualifier = type.getQualifier();
if ((qualifier == EvqOut) || (qualifier == EvqInOut))
{
ensureVersionIsAtLeast(GLSL_VERSION_120);
break;
}
}
}
}
bool TVersionGLSL::visitAggregate(Visit, TIntermAggregate *node)
{
if (node->getOp() == EOpConstruct && node->getType().isMatrix())
{
const TIntermSequence &sequence = *(node->getSequence());
if (sequence.size() == 1)
{
TIntermTyped *typed = sequence.front()->getAsTyped();
if (typed && typed->isMatrix())
{
ensureVersionIsAtLeast(GLSL_VERSION_120);
}
}
}
return true;
}
void TVersionGLSL::ensureVersionIsAtLeast(int version)
{
mVersion = std::max(version, mVersion);
}
} // namespace sh
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