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//
// Copyright (c) 2012-2013 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/DirectiveHandler.h"
#include <sstream>
#include "angle_gl.h"
#include "common/debug.h"
#include "compiler/translator/Diagnostics.h"
static TBehavior getBehavior(const std::string& str)
{
const char kRequire[] = "require";
const char kEnable[] = "enable";
const char kDisable[] = "disable";
const char kWarn[] = "warn";
if (str == kRequire) return EBhRequire;
else if (str == kEnable) return EBhEnable;
else if (str == kDisable) return EBhDisable;
else if (str == kWarn) return EBhWarn;
return EBhUndefined;
}
TDirectiveHandler::TDirectiveHandler(TExtensionBehavior &extBehavior,
TDiagnostics &diagnostics,
int &shaderVersion,
sh::GLenum shaderType,
bool debugShaderPrecisionSupported)
: mExtensionBehavior(extBehavior),
mDiagnostics(diagnostics),
mShaderVersion(shaderVersion),
mShaderType(shaderType),
mDebugShaderPrecisionSupported(debugShaderPrecisionSupported)
{
}
TDirectiveHandler::~TDirectiveHandler()
{
}
void TDirectiveHandler::handleError(const pp::SourceLocation& loc,
const std::string& msg)
{
mDiagnostics.writeInfo(pp::Diagnostics::PP_ERROR, loc, msg, "", "");
}
void TDirectiveHandler::handlePragma(const pp::SourceLocation& loc,
const std::string& name,
const std::string& value,
bool stdgl)
{
if (stdgl)
{
const char kInvariant[] = "invariant";
const char kAll[] = "all";
if (name == kInvariant && value == kAll)
{
if (mShaderVersion == 300 && mShaderType == GL_FRAGMENT_SHADER)
{
// ESSL 3.00.4 section 4.6.1
mDiagnostics.writeInfo(
pp::Diagnostics::PP_ERROR, loc,
"#pragma STDGL invariant(all) can not be used in fragment shader", name, value);
}
mPragma.stdgl.invariantAll = true;
}
// The STDGL pragma is used to reserve pragmas for use by future
// revisions of GLSL. Do not generate an error on unexpected
// name and value.
return;
}
else
{
const char kOptimize[] = "optimize";
const char kDebug[] = "debug";
const char kDebugShaderPrecision[] = "webgl_debug_shader_precision";
const char kOn[] = "on";
const char kOff[] = "off";
bool invalidValue = false;
if (name == kOptimize)
{
if (value == kOn) mPragma.optimize = true;
else if (value == kOff) mPragma.optimize = false;
else invalidValue = true;
}
else if (name == kDebug)
{
if (value == kOn) mPragma.debug = true;
else if (value == kOff) mPragma.debug = false;
else invalidValue = true;
}
else if (name == kDebugShaderPrecision && mDebugShaderPrecisionSupported)
{
if (value == kOn) mPragma.debugShaderPrecision = true;
else if (value == kOff) mPragma.debugShaderPrecision = false;
else invalidValue = true;
}
else
{
mDiagnostics.report(pp::Diagnostics::PP_UNRECOGNIZED_PRAGMA, loc, name);
return;
}
if (invalidValue)
{
mDiagnostics.writeInfo(pp::Diagnostics::PP_ERROR, loc,
"invalid pragma value", value,
"'on' or 'off' expected");
}
}
}
void TDirectiveHandler::handleExtension(const pp::SourceLocation& loc,
const std::string& name,
const std::string& behavior)
{
const char kExtAll[] = "all";
TBehavior behaviorVal = getBehavior(behavior);
if (behaviorVal == EBhUndefined)
{
mDiagnostics.writeInfo(pp::Diagnostics::PP_ERROR, loc,
"behavior", name, "invalid");
return;
}
if (name == kExtAll)
{
if (behaviorVal == EBhRequire)
{
mDiagnostics.writeInfo(pp::Diagnostics::PP_ERROR, loc,
"extension", name,
"cannot have 'require' behavior");
}
else if (behaviorVal == EBhEnable)
{
mDiagnostics.writeInfo(pp::Diagnostics::PP_ERROR, loc,
"extension", name,
"cannot have 'enable' behavior");
}
else
{
for (TExtensionBehavior::iterator iter = mExtensionBehavior.begin();
iter != mExtensionBehavior.end(); ++iter)
iter->second = behaviorVal;
}
return;
}
TExtensionBehavior::iterator iter = mExtensionBehavior.find(name);
if (iter != mExtensionBehavior.end())
{
iter->second = behaviorVal;
return;
}
pp::Diagnostics::Severity severity = pp::Diagnostics::PP_ERROR;
switch (behaviorVal) {
case EBhRequire:
severity = pp::Diagnostics::PP_ERROR;
break;
case EBhEnable:
case EBhWarn:
case EBhDisable:
severity = pp::Diagnostics::PP_WARNING;
break;
default:
UNREACHABLE();
break;
}
mDiagnostics.writeInfo(severity, loc,
"extension", name, "is not supported");
}
void TDirectiveHandler::handleVersion(const pp::SourceLocation& loc,
int version)
{
if (version == 100 || version == 300 || version == 310)
{
mShaderVersion = version;
}
else
{
std::stringstream stream;
stream << version;
std::string str = stream.str();
mDiagnostics.writeInfo(pp::Diagnostics::PP_ERROR, loc,
"version number", str, "not supported");
}
}
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