fe5d6928d0
Declare This solves several issues caused by the lack of ordering guarantees in C++; it was possible for the SkSL backend to look for the value of a variable before its Declare() call gets processed. Moving the initial value out of Declare should fix this whole class of problems. Change-Id: I428fe230f1c312a0128c1f00c2a36cb95f4590a6 Reviewed-on: https://skia-review.googlesource.com/c/skia/+/380358 Reviewed-by: John Stiles <johnstiles@google.com> Reviewed-by: Brian Osman <brianosman@google.com>
141 lines
3.1 KiB
C++
141 lines
3.1 KiB
C++
/*
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* Copyright 2020 Google LLC
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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_DSL_VAR
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#define SKSL_DSL_VAR
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#include "include/sksl/DSLExpression.h"
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#include "include/sksl/DSLModifiers.h"
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namespace SkSL {
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class Variable;
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namespace dsl {
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class DSLType;
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class DSLVar {
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public:
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/**
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* Constructs a new variable with the specified type and name. The name is used (in mangled
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* form) in the resulting shader code; it is not otherwise important. Since mangling prevents
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* name conflicts and the variable's name is only important when debugging shaders, the name
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* parameter is optional.
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*/
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DSLVar(DSLType type, const char* name = "var", DSLExpression initialValue = DSLExpression());
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DSLVar(DSLType type, DSLExpression initialValue);
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DSLVar(DSLModifiers modifiers, DSLType type, const char* name = "var",
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DSLExpression initialValue = DSLExpression());
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DSLVar(DSLModifiers modifiers, DSLType type, DSLExpression initialValue);
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DSLVar(DSLVar&&) = delete;
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~DSLVar();
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DSLExpression x() {
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return DSLExpression(*this).x();
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}
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DSLExpression y() {
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return DSLExpression(*this).y();
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}
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DSLExpression z() {
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return DSLExpression(*this).z();
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}
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DSLExpression w() {
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return DSLExpression(*this).w();
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}
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DSLExpression r() {
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return DSLExpression(*this).r();
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}
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DSLExpression g() {
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return DSLExpression(*this).g();
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}
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DSLExpression b() {
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return DSLExpression(*this).b();
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}
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DSLExpression a() {
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return DSLExpression(*this).a();
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}
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DSLExpression field(const char* name) {
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return DSLExpression(*this).field(name);
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}
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DSLPossibleExpression operator=(const DSLVar& var) {
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return this->operator=(DSLExpression(var));
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}
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DSLPossibleExpression operator=(DSLExpression expr);
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DSLPossibleExpression operator=(int expr) {
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return this->operator=(DSLExpression(expr));
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}
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DSLPossibleExpression operator=(float expr) {
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return this->operator=(DSLExpression(expr));
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}
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DSLPossibleExpression operator[](DSLExpression&& index);
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DSLPossibleExpression operator++() {
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return ++DSLExpression(*this);
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}
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DSLPossibleExpression operator++(int) {
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return DSLExpression(*this)++;
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}
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DSLPossibleExpression operator--() {
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return --DSLExpression(*this);
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}
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DSLPossibleExpression operator--(int) {
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return DSLExpression(*this)--;
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}
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private:
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/**
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* Constructs a reference to a variable that already exists in the symbol table. This is used
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* internally to reference built-in vars.
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*/
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DSLVar(const char* name);
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const char* name() const {
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return fName;
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}
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int fUniformHandle;
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std::unique_ptr<SkSL::Statement> fDeclaration;
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bool fDeclared = false;
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const SkSL::Variable* fVar;
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const char* fName;
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friend DSLVar sk_SampleCoord();
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friend class DSLCore;
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friend class DSLExpression;
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friend class DSLWriter;
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};
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} // namespace dsl
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} // namespace SkSL
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#endif
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