1 // Copyright 2020 The Tint Authors.
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 //     http://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14 
15 #include "src/writer/spirv/operand.h"
16 
17 namespace tint {
18 namespace writer {
19 namespace spirv {
20 
21 // static
Float(float val)22 Operand Operand::Float(float val) {
23   Operand o(Kind::kFloat);
24   o.set_float(val);
25   return o;
26 }
27 
28 // static
Int(uint32_t val)29 Operand Operand::Int(uint32_t val) {
30   Operand o(Kind::kInt);
31   o.set_int(val);
32   return o;
33 }
34 
35 // static
String(const std::string& val)36 Operand Operand::String(const std::string& val) {
37   Operand o(Kind::kString);
38   o.set_string(val);
39   return o;
40 }
41 
Operand(Kind kind)42 Operand::Operand(Kind kind) : kind_(kind) {}
43 
44 Operand::~Operand() = default;
45 
length() const46 uint32_t Operand::length() const {
47   uint32_t val = 0;
48   switch (kind_) {
49     case Kind::kFloat:
50     case Kind::kInt:
51       val = 1;
52       break;
53     case Kind::kString:
54       // SPIR-V always nul-terminates strings. The length is rounded up to a
55       // multiple of 4 bytes with 0 bytes padding the end. Accounting for the
56       // nul terminator is why '+ 4u' is used here instead of '+ 3u'.
57       val = static_cast<uint32_t>((str_val_.length() + 4u) >> 2);
58       break;
59   }
60   return val;
61 }
62 
63 }  // namespace spirv
64 }  // namespace writer
65 }  // namespace tint
66