6cfe358193
Change-Id: Ic9288665fd31bde986720cd259b132a5cb9d87a6 Reviewed-on: https://skia-review.googlesource.com/c/skia/+/459178 Commit-Queue: Ethan Nicholas <ethannicholas@google.com> Reviewed-by: John Stiles <johnstiles@google.com>
142 lines
3.7 KiB
C++
142 lines
3.7 KiB
C++
/*
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* Copyright 2016 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef SKSL_MODIFIERS
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#define SKSL_MODIFIERS
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#include "include/private/SkSLLayout.h"
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#include <vector>
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namespace SkSL {
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class Context;
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/**
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* A set of modifier keywords (in, out, uniform, etc.) appearing before a declaration.
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*/
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struct Modifiers {
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/**
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* OpenGL requires modifiers to be in a strict order:
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* - invariant-qualifier: (invariant)
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* - interpolation-qualifier: flat, noperspective, (smooth)
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* - storage-qualifier: const, uniform
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* - parameter-qualifier: in, out, inout
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* - precision-qualifier: highp, mediump, lowp
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*
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* SkSL does not have `invariant` or `smooth`.
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*/
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enum Flag {
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kNo_Flag = 0,
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// Real GLSL modifiers
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kFlat_Flag = 1 << 0,
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kNoPerspective_Flag = 1 << 1,
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kConst_Flag = 1 << 2,
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kUniform_Flag = 1 << 3,
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kIn_Flag = 1 << 4,
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kOut_Flag = 1 << 5,
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kHighp_Flag = 1 << 6,
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kMediump_Flag = 1 << 7,
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kLowp_Flag = 1 << 8,
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// SkSL extensions, not present in GLSL
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kES3_Flag = 1 << 9,
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kHasSideEffects_Flag = 1 << 10,
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kInline_Flag = 1 << 11,
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kNoInline_Flag = 1 << 12,
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};
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Modifiers()
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: fLayout(Layout())
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, fFlags(0) {}
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Modifiers(const Layout& layout, int flags)
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: fLayout(layout)
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, fFlags(flags) {}
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String description() const {
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String result = fLayout.description();
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// SkSL extensions
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if (fFlags & kES3_Flag) {
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result += "$es3 ";
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}
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if (fFlags & kHasSideEffects_Flag) {
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result += "sk_has_side_effects ";
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}
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if (fFlags & kNoInline_Flag) {
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result += "noinline ";
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}
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// Real GLSL qualifiers (must be specified in order in GLSL 4.1 and below)
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if (fFlags & kFlat_Flag) {
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result += "flat ";
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}
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if (fFlags & kNoPerspective_Flag) {
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result += "noperspective ";
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}
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if (fFlags & kConst_Flag) {
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result += "const ";
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}
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if (fFlags & kUniform_Flag) {
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result += "uniform ";
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}
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if ((fFlags & kIn_Flag) && (fFlags & kOut_Flag)) {
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result += "inout ";
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} else if (fFlags & kIn_Flag) {
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result += "in ";
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} else if (fFlags & kOut_Flag) {
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result += "out ";
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}
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if (fFlags & kHighp_Flag) {
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result += "highp ";
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}
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if (fFlags & kMediump_Flag) {
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result += "mediump ";
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}
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if (fFlags & kLowp_Flag) {
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result += "lowp ";
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}
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return result;
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}
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bool operator==(const Modifiers& other) const {
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return fLayout == other.fLayout && fFlags == other.fFlags;
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}
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bool operator!=(const Modifiers& other) const {
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return !(*this == other);
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}
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/**
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* Verifies that only permitted modifiers and layout flags are included. Reports errors and
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* returns false in the event of a violation.
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*/
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bool checkPermitted(const Context& context, int line, int permittedModifierFlags,
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int permittedLayoutFlags) const;
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Layout fLayout;
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int fFlags;
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};
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} // namespace SkSL
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namespace std {
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template <>
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struct hash<SkSL::Modifiers> {
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size_t operator()(const SkSL::Modifiers& key) const {
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return (size_t) key.fFlags ^ ((size_t) key.fLayout.fFlags << 8) ^
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((size_t) key.fLayout.fBuiltin << 16);
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}
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};
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} // namespace std
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#endif
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