1 /*
2  * Copyright 2016 Google Inc.
3  *
4  * Use of this source code is governed by a BSD-style license that can be
5  * found in the LICENSE file.
6  */
7 
8 #ifndef SKSL_INTERFACEBLOCK
9 #define SKSL_INTERFACEBLOCK
10 
11 #include "SkSLProgramElement.h"
12 #include "SkSLSymbolTable.h"
13 #include "SkSLVarDeclarations.h"
14 
15 namespace SkSL {
16 
17 /**
18  * An interface block, as in:
19  *
20  * out gl_PerVertex {
21  *   layout(builtin=0) vec4 gl_Position;
22  *   layout(builtin=1) float gl_PointSize;
23  * };
24  *
25  * At the IR level, this is represented by a single variable of struct type.
26  */
27 struct InterfaceBlock : public ProgramElement {
InterfaceBlockInterfaceBlock28     InterfaceBlock(Position position, const Variable& var, SkString typeName, SkString instanceName,
29                    std::vector<std::unique_ptr<Expression>> sizes,
30                    std::shared_ptr<SymbolTable> typeOwner)
31     : INHERITED(position, kInterfaceBlock_Kind)
32     , fVariable(std::move(var))
33     , fTypeName(std::move(typeName))
34     , fInstanceName(std::move(instanceName))
35     , fSizes(std::move(sizes))
36     , fTypeOwner(typeOwner) {}
37 
descriptionInterfaceBlock38     SkString description() const override {
39         SkString result = fVariable.fModifiers.description() + fTypeName + " {\n";
40         const Type* structType = &fVariable.fType;
41         while (structType->kind() == Type::kArray_Kind) {
42             structType = &structType->componentType();
43         }
44         for (const auto& f : structType->fields()) {
45             result += f.description() + "\n";
46         }
47         result += "}";
48         if (fInstanceName.size()) {
49             result += " " + fInstanceName;
50             for (const auto& size : fSizes) {
51                 result += "[";
52                 if (size) {
53                     result += size->description();
54                 }
55                 result += "]";
56             }
57         }
58         return result + ";";
59     }
60 
61     const Variable& fVariable;
62     const SkString fTypeName;
63     const SkString fInstanceName;
64     const std::vector<std::unique_ptr<Expression>> fSizes;
65     const std::shared_ptr<SymbolTable> fTypeOwner;
66 
67     typedef ProgramElement INHERITED;
68 };
69 
70 } // namespace
71 
72 #endif
73