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- /*
- * Copyright (C) 2023 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 <engine/gl/image-view.hpp>
- #include <engine/gl/opengl/gl-format-lut.hpp>
- #include <stdexcept>
- #include <glad/gl.h>
-
- namespace gl {
-
- image_view::image_view
- (
- std::shared_ptr<gl::image> image,
- std::uint8_t dimensionality,
- gl::format format,
- std::uint32_t first_mip_level,
- std::uint32_t mip_level_count,
- std::uint32_t first_array_layer,
- std::uint32_t array_layer_count,
- std::uint8_t flags
- )
- {
- if (!image)
- {
- throw std::invalid_argument("Image view has null image.");
- }
-
- if (format == gl::format::undefined)
- {
- format = image->get_format();
- }
-
- const auto format_index = std::to_underlying(format);
- const auto gl_internal_format = gl_format_lut[format_index][0];
-
- if (!gl_internal_format)
- {
- throw std::invalid_argument("Image view has unsupported format.");
- }
-
- if (!mip_level_count)
- {
- throw std::invalid_argument("Image view has zero mip levels.");
- }
-
- if (first_mip_level + mip_level_count > image->get_mip_levels())
- {
- throw std::out_of_range("Image view mip range out of image mip range.");
- }
-
- if (!array_layer_count)
- {
- throw std::invalid_argument("Image view has zero array layers.");
- }
-
- if (first_array_layer + array_layer_count > image->get_array_layers())
- {
- throw std::out_of_range("Image view array layer range out of image array layer range.");
- }
-
- if (dimensionality != image->get_dimensionality())
- {
- throw std::invalid_argument("Image view dimensionality must match image dimensionality.");
- }
-
- if (flags & std::to_underlying(image_view_flag::cube))
- {
- if (!image->is_cube_compatible())
- {
- throw std::invalid_argument("Cube image views must be constructed from cube-compatible images.");
- }
-
- if (array_layer_count % 6 != 0)
- {
- throw std::invalid_argument("Cube image views array layer count must be a multiple of 6.");
- }
- }
-
- m_image = image;
- m_dimensionality = dimensionality;
- m_format = format;
- m_first_mip_level = first_mip_level;
- m_mip_level_count = mip_level_count;
- m_first_array_layer = first_array_layer;
- m_array_layer_count = array_layer_count;
- m_flags = flags;
-
- unsigned int gl_target = 0;
- switch (dimensionality)
- {
- case 1:
- gl_target = is_array() ? GL_TEXTURE_1D_ARRAY : GL_TEXTURE_1D;
- break;
-
- case 2:
- if (is_cube())
- {
- gl_target = is_array() ? GL_TEXTURE_CUBE_MAP_ARRAY : GL_TEXTURE_CUBE_MAP;
- }
- else
- {
- gl_target = is_array() ? GL_TEXTURE_2D_ARRAY : GL_TEXTURE_2D;
- }
- break;
-
- case 3:
- gl_target = GL_TEXTURE_3D;
- break;
-
- default:
- break;
- }
-
- glGenTextures(1, &m_gl_texture_name);
- glTextureView
- (
- m_gl_texture_name,
- gl_target,
- m_image->m_gl_texture_name,
- gl_internal_format,
- m_first_mip_level,
- m_mip_level_count,
- m_first_array_layer,
- m_array_layer_count
- );
- }
-
- image_view::~image_view()
- {
- glDeleteTextures(1, &m_gl_texture_name);
- }
-
- image_view_1d::image_view_1d
- (
- std::shared_ptr<gl::image> image,
- gl::format format,
- std::uint32_t first_mip_level,
- std::uint32_t mip_level_count,
- std::uint32_t first_array_layer
- ):
- image_view
- (
- image,
- 1,
- format,
- first_mip_level,
- mip_level_count,
- first_array_layer,
- 1,
- 0
- )
- {}
-
- image_view_1d_array::image_view_1d_array
- (
- std::shared_ptr<gl::image> image,
- gl::format format,
- std::uint32_t first_mip_level,
- std::uint32_t mip_level_count,
- std::uint32_t first_array_layer,
- std::uint32_t array_layer_count
- ):
- image_view
- (
- image,
- 1,
- format,
- first_mip_level,
- mip_level_count,
- first_array_layer,
- array_layer_count,
- std::to_underlying(image_view_flag::array)
- )
- {}
-
- image_view_2d::image_view_2d
- (
- std::shared_ptr<gl::image> image,
- gl::format format,
- std::uint32_t first_mip_level,
- std::uint32_t mip_level_count,
- std::uint32_t first_array_layer
- ):
- image_view
- (
- image,
- 2,
- format,
- first_mip_level,
- mip_level_count,
- first_array_layer,
- 1,
- 0
- )
- {}
-
- image_view_2d_array::image_view_2d_array
- (
- std::shared_ptr<gl::image> image,
- gl::format format,
- std::uint32_t first_mip_level,
- std::uint32_t mip_level_count,
- std::uint32_t first_array_layer,
- std::uint32_t array_layer_count
- ):
- image_view
- (
- image,
- 2,
- format,
- first_mip_level,
- mip_level_count,
- first_array_layer,
- array_layer_count,
- std::to_underlying(image_view_flag::array)
- )
- {}
-
- image_view_3d::image_view_3d
- (
- std::shared_ptr<gl::image> image,
- gl::format format,
- std::uint32_t first_mip_level,
- std::uint32_t mip_level_count
- ):
- image_view
- (
- image,
- 3,
- format,
- first_mip_level,
- mip_level_count,
- 0,
- 1,
- 0
- )
- {}
-
- image_view_cube::image_view_cube
- (
- std::shared_ptr<gl::image> image,
- gl::format format,
- std::uint32_t first_mip_level,
- std::uint32_t mip_level_count,
- std::uint32_t first_array_layer
- ):
- image_view
- (
- image,
- 2,
- format,
- first_mip_level,
- mip_level_count,
- first_array_layer,
- 6,
- std::to_underlying(image_view_flag::cube)
- )
- {}
-
- image_view_cube_array::image_view_cube_array
- (
- std::shared_ptr<gl::image> image,
- gl::format format,
- std::uint32_t first_mip_level,
- std::uint32_t mip_level_count,
- std::uint32_t first_array_layer,
- std::uint32_t array_layer_count
- ):
- image_view
- (
- image,
- 2,
- format,
- first_mip_level,
- mip_level_count,
- first_array_layer,
- array_layer_count,
- std::to_underlying(image_view_flag::array) | std::to_underlying(image_view_flag::cube)
- )
- {}
-
- } // namespace gl
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