/*
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* Copyright (C) 2020 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 "rasterizer/vertex-buffer.hpp"
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#include <glad/glad.h>
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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(std::size_t size, const void* data, buffer_usage usage):
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gl_buffer_id(0),
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size(size),
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usage(usage)
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{
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GLenum gl_usage = buffer_usage_lut[static_cast<std::size_t>(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, size, data, gl_usage);
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}
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vertex_buffer::vertex_buffer():
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vertex_buffer(0, nullptr, buffer_usage::static_draw)
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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(std::size_t size, const void* data, buffer_usage usage)
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{
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this->size = size;
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this->usage = usage;
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GLenum gl_usage = buffer_usage_lut[static_cast<std::size_t>(usage)];
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glBindBuffer(GL_ARRAY_BUFFER, gl_buffer_id);
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glBufferData(GL_ARRAY_BUFFER, size, data, gl_usage);
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}
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void vertex_buffer::resize(std::size_t size, const void* data)
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{
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repurpose(size, data, usage);
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}
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void vertex_buffer::update(int offset, std::size_t size, const void* data)
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{
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glBindBuffer(GL_ARRAY_BUFFER, gl_buffer_id);
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glBufferSubData(GL_ARRAY_BUFFER, offset, size, data);
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}
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