💿🐜 Antkeeper source code
https://antkeeper.com
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149 lines
4.2 KiB
149 lines
4.2 KiB
/*
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* Copyright (C) 2023 Christopher J. Howard
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*
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* This file is part of Antkeeper source code.
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*
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* Antkeeper source code 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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* Antkeeper source code 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 Antkeeper source code. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <engine/gl/vertex-buffer.hpp>
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#include <stdexcept>
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#include <glad/glad.h>
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namespace gl {
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static constexpr GLenum buffer_usage_lut[] =
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{
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GL_STREAM_DRAW,
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GL_STREAM_READ,
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GL_STREAM_COPY,
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GL_STATIC_DRAW,
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GL_STATIC_READ,
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GL_STATIC_COPY,
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GL_DYNAMIC_DRAW,
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GL_DYNAMIC_READ,
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GL_DYNAMIC_COPY
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};
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vertex_buffer::vertex_buffer(buffer_usage usage, std::size_t size, std::span<const std::byte> data):
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m_usage{usage},
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m_size{size}
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{
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if (!data.empty())
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{
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// Bounds check
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if (data.size() < size)
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{
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throw std::out_of_range("Vertex buffer creation operation exceeded data bounds.");
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}
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}
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const GLenum gl_usage = buffer_usage_lut[static_cast<std::size_t>(m_usage)];
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glGenBuffers(1, &gl_buffer_id);
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glBindBuffer(GL_ARRAY_BUFFER, gl_buffer_id);
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glBufferData(GL_ARRAY_BUFFER, static_cast<GLsizeiptr>(m_size), data.empty() ? nullptr : data.data(), gl_usage);
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}
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vertex_buffer::vertex_buffer():
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vertex_buffer(buffer_usage::static_draw, 0)
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{}
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vertex_buffer::~vertex_buffer()
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{
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glDeleteBuffers(1, &gl_buffer_id);
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}
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void vertex_buffer::repurpose(buffer_usage usage, std::size_t size, std::span<const std::byte> data)
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{
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if (!data.empty())
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{
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// Bounds check
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if (data.size() < size)
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{
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throw std::out_of_range("Vertex buffer resize operation exceeded data bounds.");
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}
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}
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m_usage = usage;
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m_size = size;
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const GLenum gl_usage = buffer_usage_lut[static_cast<std::size_t>(m_usage)];
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glBindBuffer(GL_ARRAY_BUFFER, gl_buffer_id);
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glBufferData(GL_ARRAY_BUFFER, static_cast<GLsizeiptr>(m_size), data.empty() ? nullptr : data.data(), gl_usage);
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}
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void vertex_buffer::repurpose(buffer_usage usage, std::span<const std::byte> data)
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{
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repurpose(usage, m_size, data);
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}
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void vertex_buffer::resize(std::size_t size, std::span<const std::byte> data)
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{
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repurpose(m_usage, size, data);
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}
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void vertex_buffer::write(std::span<const std::byte> data, std::size_t offset)
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{
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// Ignore empty write operations
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if (data.empty())
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{
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return;
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}
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// Bounds check
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if (offset + data.size() > m_size)
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{
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throw std::out_of_range("Vertex buffer write operation exceeded buffer bounds.");
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}
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glBindBuffer(GL_ARRAY_BUFFER, gl_buffer_id);
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glBufferSubData(GL_ARRAY_BUFFER, static_cast<GLintptr>(offset), static_cast<GLsizeiptr>(data.size()), data.data());
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}
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void vertex_buffer::read(std::span<std::byte> data, std::size_t offset) const
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{
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// Abort empty read operations
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if (data.empty())
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{
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return;
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}
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// Bounds check
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if (offset + data.size() > m_size)
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{
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throw std::out_of_range("Vertex buffer read operation exceeded buffer bounds.");
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}
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glBindBuffer(GL_ARRAY_BUFFER, gl_buffer_id);
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glGetBufferSubData(GL_ARRAY_BUFFER, static_cast<GLintptr>(offset), static_cast<GLsizeiptr>(data.size()), data.data());
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}
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void vertex_buffer::copy(const vertex_buffer& read_buffer, std::size_t copy_size, std::size_t read_offset, std::size_t write_offset)
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{
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// Bounds check
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if (read_offset + copy_size > read_buffer.m_size)
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{
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throw std::out_of_range("Vertex buffer copy operation exceeded read buffer bounds.");
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}
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if (write_offset + copy_size > m_size)
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{
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throw std::out_of_range("Vertex buffer copy operation exceeded write buffer bounds.");
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}
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glBindBuffer(GL_COPY_READ_BUFFER, read_buffer.gl_buffer_id);
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glBindBuffer(GL_COPY_WRITE_BUFFER, gl_buffer_id);
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glCopyBufferSubData(GL_COPY_READ_BUFFER, GL_COPY_WRITE_BUFFER, static_cast<GLintptr>(read_offset), static_cast<GLintptr>(write_offset), static_cast<GLsizeiptr>(copy_size));
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}
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} // namespace gl
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