| // Copyright 2020 The Tint Authors. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| #include "src/writer/spirv/binary_writer.h" |
| |
| #include <cstring> |
| |
| namespace tint { |
| namespace writer { |
| namespace spirv { |
| namespace { |
| |
| // TODO(dsinclair): Reserve a generator ID for Tint. |
| // https://github.com/KhronosGroup/SPIRV-Headers/blob/master/include/spirv/spir-v.xml#L75 |
| const uint32_t kGeneratorId = 0; |
| |
| } // namespace |
| |
| BinaryWriter::BinaryWriter() = default; |
| |
| BinaryWriter::~BinaryWriter() = default; |
| |
| bool BinaryWriter::Write(const Builder& builder) { |
| out_.resize(builder.total_size(), 0); |
| |
| out_[idx_++] = spv::MagicNumber; |
| out_[idx_++] = 0x00010300; // Version 1.3 |
| out_[idx_++] = kGeneratorId; |
| out_[idx_++] = builder.id_bound(); |
| out_[idx_++] = 0; |
| |
| builder.iterate([this](const Instruction& inst) { |
| out_[idx_++] = |
| inst.word_length() << 16 | static_cast<uint32_t>(inst.opcode()); |
| |
| for (const auto& op : inst.operands()) { |
| process_op(op); |
| } |
| }); |
| return true; |
| } |
| |
| void BinaryWriter::process_op(const Operand& op) { |
| if (op.IsFloat()) { |
| auto f = op.to_f(); |
| memcpy(out_.data() + idx_, &f, 4); |
| } else if (op.IsInt()) { |
| out_[idx_] = op.to_i(); |
| } else { |
| const auto& str = op.to_s(); |
| // This depends on the vector being initialized to 0 values so the string |
| // is correctly padded. |
| memcpy(out_.data() + idx_, str.c_str(), str.size() + 1); |
| } |
| idx_ += op.length(); |
| } |
| |
| } // namespace spirv |
| } // namespace writer |
| } // namespace tint |