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Add gfx::texture_view specifying a part of existing texture

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This commit is contained in:
Nikita Lisitsa 2022-02-10 13:29:17 +03:00
parent 20302885b5
commit d01008114b
1 changed files with 67 additions and 0 deletions
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libs/gfx/include/psemek/gfx/texture_view.hpp Normal file
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#pragma once
#include <psemek/gfx/texture.hpp>
#include <psemek/geom/box.hpp>
namespace psemek::gfx
{
template <std::size_t D, GLenum Target>
struct basic_texture_view
{
basic_texture<D, Target> const * texture = nullptr;
geom::box<std::size_t, D> part;
basic_texture_view(basic_texture<D, Target> const * texture = nullptr);
basic_texture_view(basic_texture<D, Target> const * texture, geom::box<std::size_t, D> const & part);
std::size_t size() const { return part.dimensions(); }
std::size_t width() const
{
return part[0].length();
}
std::size_t height() const
{
if constexpr (D >= 2)
return part[1].length();
else
return 1;
}
std::size_t depth() const
{
if constexpr (D >= 3)
return part[2].length();
else
return 1;
}
explicit operator bool() const { return texture != nullptr; }
};
template <std::size_t D, GLenum Target>
basic_texture_view<D, Target>::basic_texture_view(basic_texture<D, Target> const * texture)
: texture(texture)
{
if (texture)
{
static const auto zero = geom::point<std::size_t, D>::zero();
part = geom::span(zero, zero + texture->size());
}
}
template <std::size_t D, GLenum Target>
basic_texture_view<D, Target>::basic_texture_view(basic_texture<D, Target> const * texture, geom::box<std::size_t, D> const & part)
: texture(texture)
, part(part)
{}
using texture_view_1d = basic_texture_view<1, gl::TEXTURE_1D>;
using texture_view_1d_array = basic_texture_view<2, gl::TEXTURE_1D_ARRAY>;
using texture_view_2d = basic_texture_view<2, gl::TEXTURE_2D>;
using texture_view_2d_array = basic_texture_view<3, gl::TEXTURE_2D_ARRAY>;
using texture_view_3d = basic_texture_view<3, gl::TEXTURE_3D>;
}