| /* |
| * Copyright (C) 2014 The Android Open Source Project |
| * |
| * 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. |
| */ |
| #ifndef GRAPHICS_TRANSLATION_GLES_MATRIX_STACK_H_ |
| #define GRAPHICS_TRANSLATION_GLES_MATRIX_STACK_H_ |
| |
| #include <stack> |
| #include "matrix.h" |
| |
| // Never-empty stack of matrices. Initially has an identity matrix in it |
| // and one entry will always remain. Its max depth is kMaxDepth. |
| class MatrixStack { |
| public: |
| static const size_t kMaxDepth = 32; |
| MatrixStack() { |
| stack_.push(emugl::Matrix()); |
| } |
| |
| bool Push() { |
| if (stack_.size() >= kMaxDepth) |
| return false; |
| stack_.push(stack_.top()); |
| return true; |
| } |
| |
| bool Pop() { |
| if (stack_.size() <= 1) |
| return false; |
| stack_.pop(); |
| return true; |
| } |
| |
| const emugl::Matrix& GetTop() const { |
| return stack_.top(); |
| } |
| |
| emugl::Matrix& GetTop() { |
| return stack_.top(); |
| } |
| |
| int GetDepth() const { |
| return stack_.size(); |
| } |
| |
| private: |
| std::stack<emugl::Matrix> stack_; |
| |
| MatrixStack(const MatrixStack&); |
| MatrixStack& operator=(const MatrixStack&); |
| }; |
| |
| #endif // GRAPHICS_TRANSLATION_GLES_MATRIX_STACK_H_ |