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- /*
- * Copyright (C) 2020 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 "rasterizer/framebuffer.hpp"
- #include "rasterizer/texture-2d.hpp"
- #include <glad/glad.h>
-
- static constexpr GLenum attachment_lut[] =
- {
- GL_COLOR_ATTACHMENT0,
- GL_DEPTH_ATTACHMENT,
- GL_STENCIL_ATTACHMENT
- };
-
- framebuffer::framebuffer(int width, int height):
- gl_framebuffer_id(0),
- dimensions({width, height}),
- color_attachment(nullptr),
- depth_attachment(nullptr),
- stencil_attachment(nullptr)
- {
- glGenFramebuffers(1, &gl_framebuffer_id);
- }
-
- framebuffer::framebuffer():
- gl_framebuffer_id(0),
- dimensions({0, 0}),
- color_attachment(nullptr),
- depth_attachment(nullptr),
- stencil_attachment(nullptr)
- {}
-
- framebuffer::~framebuffer()
- {
- if (gl_framebuffer_id)
- {
- glDeleteFramebuffers(1, &gl_framebuffer_id);
- }
- }
-
- void framebuffer::resize(const std::array<int, 2>& dimensions)
- {
- this->dimensions = dimensions;
- }
-
- void framebuffer::attach(framebuffer_attachment_type attachment_type, texture_2d* texture)
- {
- glBindFramebuffer(GL_FRAMEBUFFER, gl_framebuffer_id);
-
- GLenum gl_attachment = attachment_lut[static_cast<std::size_t>(attachment_type)];
- glFramebufferTexture2D(GL_FRAMEBUFFER, gl_attachment, GL_TEXTURE_2D, texture->gl_texture_id, 0);
-
- if (attachment_type == framebuffer_attachment_type::color)
- color_attachment = texture;
- else if (attachment_type == framebuffer_attachment_type::depth)
- depth_attachment = texture;
- else if (attachment_type == framebuffer_attachment_type::stencil)
- stencil_attachment = texture;
-
- if (!color_attachment)
- {
- glDrawBuffer(GL_NONE);
- glReadBuffer(GL_NONE);
- }
- else
- {
- glDrawBuffer(GL_COLOR_ATTACHMENT0);
- glReadBuffer(GL_COLOR_ATTACHMENT0);
- }
-
- glBindFramebuffer(GL_FRAMEBUFFER, 0);
- }
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