| // 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/struct_type.h" |
| |
| #include <cmath> |
| #include <utility> |
| |
| #include "src/ast/clone_context.h" |
| #include "src/ast/module.h" |
| #include "src/ast/type/alias_type.h" |
| #include "src/ast/type/array_type.h" |
| #include "src/ast/type/matrix_type.h" |
| #include "src/ast/type/vector_type.h" |
| |
| TINT_INSTANTIATE_CLASS_ID(tint::ast::type::Struct); |
| |
| namespace tint { |
| namespace ast { |
| namespace type { |
| |
| Struct::Struct(const Symbol& sym, ast::Struct* impl) |
| : symbol_(sym), struct_(impl) {} |
| |
| Struct::Struct(Struct&&) = default; |
| |
| Struct::~Struct() = default; |
| |
| std::string Struct::type_name() const { |
| return "__struct_" + symbol_.to_str(); |
| } |
| |
| uint64_t Struct::MinBufferBindingSize(MemoryLayout mem_layout) const { |
| if (!struct_->members().size()) { |
| return 0; |
| } |
| |
| auto* last_member = struct_->members().back(); |
| |
| // If there is no offset, then this is not a host-shareable struct, returning |
| // 0 indicates this to the caller. |
| if (!last_member->has_offset_decoration()) { |
| return 0; |
| } |
| |
| uint64_t size = last_member->type()->MinBufferBindingSize(mem_layout); |
| if (!size) { |
| return 0; |
| } |
| |
| float unaligned = static_cast<float>(last_member->offset() + size); |
| float alignment = static_cast<float>(BaseAlignment(mem_layout)); |
| |
| return static_cast<uint64_t>(alignment * std::ceil(unaligned / alignment)); |
| } |
| |
| uint64_t Struct::BaseAlignment(MemoryLayout mem_layout) const { |
| uint64_t max = 0; |
| for (auto* member : struct_->members()) { |
| if (member->type()->BaseAlignment(mem_layout) > max) { |
| max = member->type()->BaseAlignment(mem_layout); |
| } |
| } |
| |
| if (mem_layout == MemoryLayout::kUniformBuffer) { |
| // Round up to a vec4. |
| return static_cast<uint64_t>(16 * |
| std::ceil(static_cast<float>(max) / 16.0f)); |
| } else if (mem_layout == MemoryLayout::kStorageBuffer) { |
| return max; |
| } |
| return 0; |
| } |
| |
| Struct* Struct::Clone(CloneContext* ctx) const { |
| return ctx->mod->create<Struct>(ctx->Clone(symbol()), ctx->Clone(struct_)); |
| } |
| |
| } // namespace type |
| } // namespace ast |
| } // namespace tint |