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/*
* Copyright 2016 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SKSL_MODIFIERS
#define SKSL_MODIFIERS
#include "include/private/SkSLLayout.h"
#include <vector>
namespace SkSL {
class Context;
/**
* A set of modifier keywords (in, out, uniform, etc.) appearing before a declaration.
*/
struct Modifiers {
/**
* OpenGL requires modifiers to be in a strict order:
* - invariant-qualifier: (invariant)
* - interpolation-qualifier: flat, noperspective, (smooth)
* - storage-qualifier: const, uniform
* - parameter-qualifier: in, out, inout
* - precision-qualifier: highp, mediump, lowp
*
* SkSL does not have `invariant` or `smooth`.
*/
enum Flag {
kNo_Flag = 0,
// Real GLSL modifiers
kFlat_Flag = 1 << 0,
kNoPerspective_Flag = 1 << 1,
kConst_Flag = 1 << 2,
kUniform_Flag = 1 << 3,
kIn_Flag = 1 << 4,
kOut_Flag = 1 << 5,
kHighp_Flag = 1 << 6,
kMediump_Flag = 1 << 7,
kLowp_Flag = 1 << 8,
// SkSL extensions, not present in GLSL
kES3_Flag = 1 << 9,
kHasSideEffects_Flag = 1 << 10,
kInline_Flag = 1 << 11,
kNoInline_Flag = 1 << 12,
};
Modifiers()
: fLayout(Layout())
, fFlags(0) {}
Modifiers(const Layout& layout, int flags)
: fLayout(layout)
, fFlags(flags) {}
String description() const {
String result = fLayout.description();
// SkSL extensions
if (fFlags & kES3_Flag) {
result += "$es3 ";
}
if (fFlags & kHasSideEffects_Flag) {
result += "sk_has_side_effects ";
}
if (fFlags & kNoInline_Flag) {
result += "noinline ";
}
// Real GLSL qualifiers (must be specified in order in GLSL 4.1 and below)
if (fFlags & kFlat_Flag) {
result += "flat ";
}
if (fFlags & kNoPerspective_Flag) {
result += "noperspective ";
}
if (fFlags & kConst_Flag) {
result += "const ";
}
if (fFlags & kUniform_Flag) {
result += "uniform ";
}
if ((fFlags & kIn_Flag) && (fFlags & kOut_Flag)) {
result += "inout ";
} else if (fFlags & kIn_Flag) {
result += "in ";
} else if (fFlags & kOut_Flag) {
result += "out ";
}
if (fFlags & kHighp_Flag) {
result += "highp ";
}
if (fFlags & kMediump_Flag) {
result += "mediump ";
}
if (fFlags & kLowp_Flag) {
result += "lowp ";
}
return result;
}
bool operator==(const Modifiers& other) const {
return fLayout == other.fLayout && fFlags == other.fFlags;
}
bool operator!=(const Modifiers& other) const {
return !(*this == other);
}
/**
* Verifies that only permitted modifiers and layout flags are included. Reports errors and
* returns false in the event of a violation.
*/
bool checkPermitted(const Context& context, int line, int permittedModifierFlags,
int permittedLayoutFlags) const;
Layout fLayout;
int fFlags;
};
} // namespace SkSL
namespace std {
template <>
struct hash<SkSL::Modifiers> {
size_t operator()(const SkSL::Modifiers& key) const {
return (size_t) key.fFlags ^ ((size_t) key.fLayout.fFlags << 8) ^
((size_t) key.fLayout.fBuiltin << 16);
}
};
} // namespace std
#endif
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