122 lines
2.5 KiB
C++
122 lines
2.5 KiB
C++
#pragma once
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/*
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* Copyright (C) 2024 Brett Terpstra
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#ifndef BLT_GFX_VAO_H
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#define BLT_GFX_VAO_H
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#include <memory>
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#include <vbo.h>
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#include <blt/std/vector.h>
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namespace blt::gfx
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{
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class unique_vao_t;
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namespace detail
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{
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struct vao_vbo_storage_t
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{
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std::unique_ptr<unique_vbo_t> vbo;
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u32 attribute_number = 0;
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[[nodiscard]] bool is_element() const
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{
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return vbo->get_buffer_type() == GL_ELEMENT_ARRAY_BUFFER;
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}
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explicit vao_vbo_storage_t(unique_vbo_t&& vbo): vbo(std::make_unique<unique_vbo_t>(std::move(vbo)))
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{}
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};
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class vao_vbo_context_t
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{
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friend class vao_context_t;
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public:
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private:
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vao_vbo_context_t(unique_vao_t& vao, vao_vbo_storage_t& vbo): vbo(vbo), vao(vao)
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{}
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vao_vbo_storage_t& vbo;
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unique_vao_t& vao;
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};
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class vao_context_t
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{
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friend vao_vbo_context_t;
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friend class unique_vao_t;
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public:
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vao_context_t& bind();
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vao_context_t& unbind();
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vao_vbo_context_t attach_vbo(unique_vbo_t&& vbo) const;
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private:
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[[nodiscard]] bool is_bound() const;
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explicit vao_context_t(unique_vao_t& vao): vao(vao)
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{
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bind();
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}
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unique_vao_t& vao;
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};
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}
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class unique_vao_t
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{
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friend detail::vao_vbo_context_t;
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friend detail::vao_context_t;
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public:
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unique_vao_t(): vaoID(0)
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{
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glGenVertexArrays(1, &*vaoID);
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}
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unique_vao_t(const unique_vao_t&) = delete;
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unique_vao_t& operator=(const unique_vao_t&) = delete;
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unique_vao_t(unique_vao_t&& other) noexcept: vaoID(std::exchange(other.vaoID, std::nullopt))
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{}
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unique_vao_t& operator=(unique_vao_t&& other) noexcept
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{
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vaoID = std::exchange(other.vaoID, vaoID);
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return *this;
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}
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detail::vao_context_t bind();
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~unique_vao_t()
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{
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if (vaoID)
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glDeleteVertexArrays(1, &*vaoID);
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}
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private:
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std::optional<GLuint> vaoID;
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std::vector<detail::vao_vbo_storage_t> vbo_list;
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};
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}
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#endif //BLT_GFX_VAO_H
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