| // 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/ast/type/array_type.h" |
| |
| #include <cmath> |
| |
| #include "src/ast/stride_decoration.h" |
| #include "src/ast/type/vector_type.h" |
| |
| namespace tint { |
| namespace ast { |
| namespace type { |
| |
| ArrayType::ArrayType(Type* subtype) : subtype_(subtype) {} |
| |
| ArrayType::ArrayType(Type* subtype, uint32_t size) |
| : subtype_(subtype), size_(size) {} |
| |
| ArrayType::ArrayType(ArrayType&&) = default; |
| |
| ArrayType::~ArrayType() = default; |
| |
| uint64_t ArrayType::MinBufferBindingSize(MemoryLayout mem_layout) const { |
| if (!has_array_stride()) { |
| // Arrays in buffers are required to have a stride. |
| return 0; |
| } |
| |
| if (IsRuntimeArray()) { |
| // WebGPU spec 10.1.2: |
| // If the last field of the corresponding structure defined in the shader |
| // has an unbounded array type, then the value of minBufferBindingSize must |
| // be greater than or equal to the byte offset of that field plus the stride |
| // of the unbounded array |
| return array_stride(); |
| } else { |
| // Not including the padding for the last element |
| return (size_ - 1) * array_stride() + |
| subtype_->MinBufferBindingSize(mem_layout); |
| } |
| } |
| |
| uint64_t ArrayType::BaseAlignment(MemoryLayout mem_layout) const { |
| if (mem_layout == MemoryLayout::kUniformBuffer) { |
| float aligment = 16; // for a vec4 |
| float unaligned = static_cast<float>(subtype_->BaseAlignment(mem_layout)); |
| return static_cast<uint64_t>(aligment * std::ceil(unaligned / aligment)); |
| } else if (mem_layout == MemoryLayout::kStorageBuffer) { |
| return subtype_->BaseAlignment(mem_layout); |
| } |
| return 0; |
| } |
| |
| uint32_t ArrayType::array_stride() const { |
| for (auto* deco : decos_) { |
| if (deco->IsStride()) { |
| return deco->AsStride()->stride(); |
| } |
| } |
| return 0; |
| } |
| |
| bool ArrayType::has_array_stride() const { |
| for (auto* deco : decos_) { |
| if (deco->IsStride()) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| std::string ArrayType::type_name() const { |
| assert(subtype_); |
| |
| std::string type_name = "__array" + subtype_->type_name(); |
| if (!IsRuntimeArray()) |
| type_name += "_" + std::to_string(size_); |
| if (has_array_stride()) |
| type_name += "_stride_" + std::to_string(array_stride()); |
| |
| return type_name; |
| } |
| |
| } // namespace type |
| } // namespace ast |
| } // namespace tint |