- /*
- * Copyright (C) 2023 Christopher J. Howard
- *
- * This file is part of Antkeeper source code.
- *
- * Antkeeper source code is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * Antkeeper source code is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with Antkeeper source code. If not, see <http://www.gnu.org/licenses/>.
- */
-
- #ifndef ANTKEEPER_GL_VERTEX_BUFFER_HPP
- #define ANTKEEPER_GL_VERTEX_BUFFER_HPP
-
- #include <engine/gl/buffer-usage.hpp>
- #include <cstddef>
- #include <span>
-
- namespace gl {
-
- /**
- * Vertex buffer object (VBO).
- */
- class vertex_buffer
- {
- public:
- /**
- * Constructs a vertex buffer.
- *
- * @param usage Buffer usage hint.
- * @param size Buffer size, in bytes.
- * @param data Buffer data. If empty, buffer data will not be set.
- *
- * @except std::out_of_range Vertex buffer construct operation exceeded data bounds.
- */
- /// @{
- vertex_buffer(buffer_usage usage, std::size_t size, std::span<const std::byte> data = {});
-
- inline explicit vertex_buffer(buffer_usage usage, std::span<const std::byte> data = {}):
- vertex_buffer(usage, data.size(), data)
- {}
-
- inline vertex_buffer():
- vertex_buffer(buffer_usage::static_draw, 0)
- {}
- /// @}
-
- /**
- * Constructs a copy of a vertex buffer.
- *
- * @param buffer Buffer to copy.
- */
- vertex_buffer(const vertex_buffer& buffer);
-
- /**
- * Move-constructs a vertex buffer.
- *
- * @param buffer Buffer to move.
- */
- vertex_buffer(vertex_buffer&& buffer);
-
- /// Destroys a vertex buffer.
- ~vertex_buffer();
-
- /**
- * Copies another vertex buffer.
- *
- * @param buffer Buffer to copy.
- *
- * @return Reference to this vertex buffer.
- */
- vertex_buffer& operator=(const vertex_buffer& buffer);
-
- /**
- * Moves another vertex buffer into this buffer.
- *
- * @param buffer Buffer to move.
- *
- * @return Reference to this vertex buffer.
- */
- vertex_buffer& operator=(vertex_buffer&& buffer);
-
- /**
- * Repurposes the vertex buffer, changing its usage hint, size, and updating its data.
- *
- * @param usage New buffer usage hint.
- * @param size New buffer size, in bytes.
- * @param data New buffer data. If empty, buffer data will not be updated.
- *
- * @except std::out_of_range Vertex buffer resize operation exceeded data bounds.
- */
- /// @{
- void repurpose(buffer_usage usage, std::size_t size, std::span<const std::byte> data = {});
-
- inline void repurpose(buffer_usage usage, std::span<const std::byte> data)
- {
- repurpose(usage, data.size(), data);
- }
-
- inline void repurpose(buffer_usage usage)
- {
- repurpose(usage, m_size, {});
- }
- /// @}
-
- /**
- * Resizes the vertex buffer.
- *
- * @param size New buffer size, in bytes.
- * @param data New buffer data. If empty, buffer data will not be updated.
- *
- * @except std::out_of_range Vertex buffer resize operation exceeded data bounds.
- */
- /// @{
- inline void resize(std::size_t size, std::span<const std::byte> data = {})
- {
- repurpose(m_usage, size, data);
- }
-
- inline void resize(std::span<const std::byte> data)
- {
- repurpose(m_usage, data.size(), data);
- }
- /// @}
-
- /**
- * Writes data into the vertex buffer.
- *
- * @param offset Offset into the buffer's data, in bytes, where writing will begin.
- * @param data Data to write into the buffer.
- *
- * @except std::out_of_range Vertex buffer write operation exceeded buffer bounds.
- */
- /// @{
- void write(std::size_t offset, std::span<const std::byte> data);
-
- inline void write(std::span<const std::byte> data)
- {
- write(0, data);
- }
- /// @}
-
- /**
- * Reads a subset of the buffer's data from the GL and returns it to the application.
- *
- * @param offset Offset into the buffer's data, in bytes, where reading will begin.
- * @param data Data buffer where the read bytes will be stored.
- *
- * @except std::out_of_range Vertex buffer read operation exceeded buffer bounds.
- */
- /// @{
- void read(std::size_t offset, std::span<std::byte> data) const;
-
- inline void read(std::span<std::byte> data) const
- {
- read(0, data);
- }
- /// @}
-
- /**
- * Copies a subset of another vertex buffer's data into this vertex buffer.
- *
- * @param read_buffer Buffer from which data will be read.
- * @param copy_size Number of bytes to copy from the read buffer into this buffer.
- * @param read_offset Offset into the read buffer's data, in bytes, where reading will begin.
- * @param write_offset Offset into the this buffer's data, in bytes, where writing will begin.
- *
- * @except std::out_of_range Vertex buffer copy operation exceeded read buffer bounds.
- * @except std::out_of_range Vertex buffer copy operation exceeded write buffer bounds.
- */
- void copy(const vertex_buffer& read_buffer, std::size_t copy_size, std::size_t read_offset = 0, std::size_t write_offset = 0);
-
- /// Returns the size of the buffer's data, in bytes.
- [[nodiscard]] inline constexpr std::size_t size() const noexcept
- {
- return m_size;
- }
-
- /// Return's the buffer's usage hint.
- [[nodiscard]] inline constexpr buffer_usage usage() const noexcept
- {
- return m_usage;
- }
-
- private:
- friend class pipeline;
-
- unsigned int m_gl_named_buffer{0};
- buffer_usage m_usage{buffer_usage::static_draw};
- std::size_t m_size{0};
- };
-
- } // namespace gl
-
- #endif // ANTKEEPER_GL_VERTEX_BUFFER_HPP
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