💿🐜 Antkeeper source code
https://antkeeper.com
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298 lines
5.9 KiB
298 lines
5.9 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/image-view.hpp>
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#include <engine/gl/opengl/gl-format-lut.hpp>
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#include <stdexcept>
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#include <glad/gl.h>
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namespace gl {
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image_view::image_view
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(
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std::shared_ptr<gl::image> image,
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std::uint8_t dimensionality,
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gl::format format,
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std::uint32_t first_mip_level,
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std::uint32_t mip_level_count,
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std::uint32_t first_array_layer,
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std::uint32_t array_layer_count,
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std::uint8_t flags
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)
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{
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if (!image)
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{
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throw std::invalid_argument("Image view has null image.");
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}
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if (format == gl::format::undefined)
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{
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format = image->get_format();
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}
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const auto format_index = std::to_underlying(format);
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const auto gl_internal_format = gl_format_lut[format_index][0];
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if (!gl_internal_format)
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{
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throw std::invalid_argument("Image view has unsupported format.");
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}
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if (!mip_level_count)
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{
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throw std::invalid_argument("Image view has zero mip levels.");
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}
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if (first_mip_level + mip_level_count > image->get_mip_levels())
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{
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throw std::out_of_range("Image view mip range out of image mip range.");
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}
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if (!array_layer_count)
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{
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throw std::invalid_argument("Image view has zero array layers.");
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}
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if (first_array_layer + array_layer_count > image->get_array_layers())
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{
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throw std::out_of_range("Image view array layer range out of image array layer range.");
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}
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if (dimensionality != image->get_dimensionality())
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{
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throw std::invalid_argument("Image view dimensionality must match image dimensionality.");
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}
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if (flags & std::to_underlying(image_view_flag::cube))
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{
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if (!image->is_cube_compatible())
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{
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throw std::invalid_argument("Cube image views must be constructed from cube-compatible images.");
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}
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if (array_layer_count % 6 != 0)
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{
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throw std::invalid_argument("Cube image views array layer count must be a multiple of 6.");
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}
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}
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m_image = image;
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m_dimensionality = dimensionality;
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m_format = format;
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m_first_mip_level = first_mip_level;
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m_mip_level_count = mip_level_count;
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m_first_array_layer = first_array_layer;
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m_array_layer_count = array_layer_count;
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m_flags = flags;
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unsigned int gl_target = 0;
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switch (dimensionality)
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{
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case 1:
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gl_target = is_array() ? GL_TEXTURE_1D_ARRAY : GL_TEXTURE_1D;
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break;
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case 2:
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if (is_cube())
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{
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gl_target = is_array() ? GL_TEXTURE_CUBE_MAP_ARRAY : GL_TEXTURE_CUBE_MAP;
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}
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else
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{
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gl_target = is_array() ? GL_TEXTURE_2D_ARRAY : GL_TEXTURE_2D;
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}
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break;
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case 3:
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gl_target = GL_TEXTURE_3D;
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break;
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default:
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break;
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}
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glGenTextures(1, &m_gl_texture_name);
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glTextureView
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(
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m_gl_texture_name,
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gl_target,
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m_image->m_gl_texture_name,
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gl_internal_format,
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m_first_mip_level,
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m_mip_level_count,
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m_first_array_layer,
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m_array_layer_count
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);
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}
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image_view::~image_view()
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{
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glDeleteTextures(1, &m_gl_texture_name);
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}
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image_view_1d::image_view_1d
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(
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std::shared_ptr<gl::image> image,
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gl::format format,
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std::uint32_t first_mip_level,
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std::uint32_t mip_level_count,
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std::uint32_t first_array_layer
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):
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image_view
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(
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image,
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1,
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format,
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first_mip_level,
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mip_level_count,
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first_array_layer,
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1,
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0
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)
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{}
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image_view_1d_array::image_view_1d_array
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(
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std::shared_ptr<gl::image> image,
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gl::format format,
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std::uint32_t first_mip_level,
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std::uint32_t mip_level_count,
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std::uint32_t first_array_layer,
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std::uint32_t array_layer_count
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):
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image_view
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(
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image,
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1,
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format,
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first_mip_level,
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mip_level_count,
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first_array_layer,
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array_layer_count,
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std::to_underlying(image_view_flag::array)
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)
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{}
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image_view_2d::image_view_2d
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(
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std::shared_ptr<gl::image> image,
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gl::format format,
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std::uint32_t first_mip_level,
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std::uint32_t mip_level_count,
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std::uint32_t first_array_layer
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):
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image_view
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(
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image,
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2,
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format,
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first_mip_level,
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mip_level_count,
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first_array_layer,
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1,
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0
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)
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{}
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image_view_2d_array::image_view_2d_array
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(
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std::shared_ptr<gl::image> image,
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gl::format format,
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std::uint32_t first_mip_level,
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std::uint32_t mip_level_count,
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std::uint32_t first_array_layer,
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std::uint32_t array_layer_count
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):
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image_view
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(
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image,
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2,
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format,
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first_mip_level,
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mip_level_count,
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first_array_layer,
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array_layer_count,
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std::to_underlying(image_view_flag::array)
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)
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{}
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image_view_3d::image_view_3d
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(
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std::shared_ptr<gl::image> image,
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gl::format format,
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std::uint32_t first_mip_level,
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std::uint32_t mip_level_count
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):
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image_view
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(
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image,
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3,
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format,
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first_mip_level,
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mip_level_count,
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0,
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1,
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0
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)
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{}
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image_view_cube::image_view_cube
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(
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std::shared_ptr<gl::image> image,
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gl::format format,
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std::uint32_t first_mip_level,
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std::uint32_t mip_level_count,
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std::uint32_t first_array_layer
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):
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image_view
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(
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image,
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2,
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format,
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first_mip_level,
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mip_level_count,
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first_array_layer,
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6,
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std::to_underlying(image_view_flag::cube)
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)
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{}
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image_view_cube_array::image_view_cube_array
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(
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std::shared_ptr<gl::image> image,
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gl::format format,
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std::uint32_t first_mip_level,
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std::uint32_t mip_level_count,
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std::uint32_t first_array_layer,
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std::uint32_t array_layer_count
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):
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image_view
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(
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image,
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2,
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format,
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first_mip_level,
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mip_level_count,
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first_array_layer,
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array_layer_count,
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std::to_underlying(image_view_flag::array) | std::to_underlying(image_view_flag::cube)
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)
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{}
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} // namespace gl
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