💿🐜 Antkeeper source code
https://antkeeper.com
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
102 lines
2.8 KiB
102 lines
2.8 KiB
/*
|
|
* Copyright (C) 2021 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/>.
|
|
*/
|
|
|
|
#include "gl/vertex-buffer.hpp"
|
|
#include <stdexcept>
|
|
#include <glad/glad.h>
|
|
|
|
namespace gl {
|
|
|
|
static constexpr GLenum buffer_usage_lut[] =
|
|
{
|
|
GL_STREAM_DRAW,
|
|
GL_STREAM_READ,
|
|
GL_STREAM_COPY,
|
|
GL_STATIC_DRAW,
|
|
GL_STATIC_READ,
|
|
GL_STATIC_COPY,
|
|
GL_DYNAMIC_DRAW,
|
|
GL_DYNAMIC_READ,
|
|
GL_DYNAMIC_COPY
|
|
};
|
|
|
|
vertex_buffer::vertex_buffer(std::size_t size, const void* data, buffer_usage usage):
|
|
gl_buffer_id(0),
|
|
size(size),
|
|
usage(usage)
|
|
{
|
|
GLenum gl_usage = buffer_usage_lut[static_cast<std::size_t>(usage)];
|
|
glGenBuffers(1, &gl_buffer_id);
|
|
glBindBuffer(GL_ARRAY_BUFFER, gl_buffer_id);
|
|
glBufferData(GL_ARRAY_BUFFER, static_cast<GLsizeiptr>(size), data, gl_usage);
|
|
}
|
|
|
|
vertex_buffer::vertex_buffer():
|
|
vertex_buffer(0, nullptr, buffer_usage::static_draw)
|
|
{}
|
|
|
|
vertex_buffer::~vertex_buffer()
|
|
{
|
|
glDeleteBuffers(1, &gl_buffer_id);
|
|
}
|
|
|
|
void vertex_buffer::repurpose(buffer_usage usage, std::size_t size, const void* data)
|
|
{
|
|
this->size = size;
|
|
this->usage = usage;
|
|
|
|
GLenum gl_usage = buffer_usage_lut[static_cast<std::size_t>(usage)];
|
|
glBindBuffer(GL_ARRAY_BUFFER, gl_buffer_id);
|
|
glBufferData(GL_ARRAY_BUFFER, static_cast<GLsizeiptr>(size), data, gl_usage);
|
|
}
|
|
|
|
void vertex_buffer::resize(std::size_t size, const void* data)
|
|
{
|
|
repurpose(usage, size, data);
|
|
}
|
|
|
|
void vertex_buffer::write(std::size_t offset, std::size_t size, const void* data)
|
|
{
|
|
// Abort empty write operations
|
|
if (!size)
|
|
return;
|
|
|
|
// Bounds check
|
|
if (offset + size > this->size)
|
|
throw std::out_of_range("Vertex buffer write operation exceeded buffer bounds.");
|
|
|
|
glBindBuffer(GL_ARRAY_BUFFER, gl_buffer_id);
|
|
glBufferSubData(GL_ARRAY_BUFFER, static_cast<GLintptr>(offset), static_cast<GLsizeiptr>(size), data);
|
|
}
|
|
|
|
void vertex_buffer::read(std::size_t offset, std::size_t size, void* data) const
|
|
{
|
|
// Abort empty read operations
|
|
if (!size)
|
|
return;
|
|
|
|
// Bounds check
|
|
if (offset + size > this->size)
|
|
throw std::out_of_range("Vertex buffer read operation exceeded buffer bounds.");
|
|
|
|
glBindBuffer(GL_ARRAY_BUFFER, gl_buffer_id);
|
|
glGetBufferSubData(GL_ARRAY_BUFFER, static_cast<GLintptr>(offset), static_cast<GLsizeiptr>(size), data);
|
|
}
|
|
|
|
} // namespace gl
|