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#include "anim-atlas.hpp"
#include "compat/assert.hpp"
#include "shaders/tile.hpp"
#include "tile-defs.hpp"
#include <Magnum/Math/Color.h>
#include <Magnum/GL/TextureFormat.h>
namespace floormat {
static constexpr const char* name_array[] = { "n", "ne", "e", "se", "s", "sw", "w", "nw", };
std::uint8_t anim_atlas::rotation_to_index(const anim_def& info, rotation r) noexcept
{
StringView str = name_array[std::size_t(r)];
for (std::size_t sz = info.groups.size(), i = 0; i < sz; i++)
{
const anim_group& g = info.groups[i];
if (g.name == str)
return std::uint8_t(i);
}
return 0xff;
}
decltype(anim_atlas::_group_indices) anim_atlas::make_group_indices(const anim_def& a) noexcept
{
std::array<std::uint8_t, (std::size_t)rotation_COUNT> array;
for (std::size_t i = 0; i < array.size(); i++)
array[i] = rotation_to_index(a, rotation(i));
return array;
}
anim_atlas::anim_atlas() noexcept = default;
anim_atlas::anim_atlas(StringView name, const ImageView2D& image, anim_def info) noexcept :
_name{name},
_info{std::move(info)}, _group_indices{make_group_indices(_info)}
{
_tex.setWrapping(GL::SamplerWrapping::ClampToEdge)
.setMagnificationFilter(GL::SamplerFilter::Nearest)
.setMinificationFilter(GL::SamplerFilter::Linear)
.setMaxAnisotropy(1)
.setBorderColor(Color4{1, 0, 0, 1})
.setStorage(1, GL::textureFormat(image.format()), image.size())
.setSubImage(0, {}, image);
}
anim_atlas::~anim_atlas() noexcept = default;
anim_atlas::anim_atlas(anim_atlas&&) noexcept = default;
anim_atlas& anim_atlas::operator=(anim_atlas&&) noexcept = default;
StringView anim_atlas::name() const noexcept { return _name; }
GL::Texture2D& anim_atlas::texture() noexcept { return _tex; }
const anim_def& anim_atlas::info() const noexcept { return _info; }
auto anim_atlas::group(rotation r) const noexcept -> const anim_group&
{
const auto group_idx = _group_indices[std::size_t(r)];
fm_assert(group_idx != 0xff);
return _info.groups[group_idx];
}
auto anim_atlas::frame(rotation r, std::size_t frame) const noexcept -> const anim_frame&
{
const anim_group& g = group(r);
fm_assert(frame < g.frames.size());
return g.frames[frame];
}
auto anim_atlas::texcoords_for_frame(rotation r, std::size_t i) const noexcept -> texcoords
{
const auto f = frame(r, i);
const Vector2 p0(f.offset), p1(f.size);
const auto x0 = p0.x()+.5f, x1 = p1.x()-1, y0 = p0.y()+.5f, y1 = p1.y()-1;
const auto size = _info.pixel_size;
return {{
{ (x0+x1) / size[0], 1 - (y0+y1) / size[1] }, // bottom right
{ (x0+x1) / size[0], 1 - y0 / size[1] }, // top right
{ x0 / size[0], 1 - (y0+y1) / size[1] }, // bottom left
{ x0 / size[0], 1 - y0 / size[1] }, // top left
}};
}
auto anim_atlas::frame_quad(const Vector3& center, rotation r, std::size_t i) const noexcept -> quad
{
enum : std::size_t { x, y, z };
const auto f = frame(r, i);
const auto gx = (float)f.ground[x]*.5f, gy = (float)f.ground[y]*.5f;
const auto size = Vector2d(f.size);
const auto sx = (float)size[x]*.5f, sy = (float)size[y]*.5f;
const auto bottom_right = tile_shader::unproject({ sx - gx, sy - gy }),
top_right = tile_shader::unproject({ sx - gx, - gy }),
bottom_left = tile_shader::unproject({ - gx, sy - gy }),
top_left = tile_shader::unproject({ - gx, - gy });
const auto c = center + Vector3(group(r).offset);
return {{
{ c[x] + bottom_right[x], c[y] + bottom_right[y], c[z] },
{ c[x] + top_right[x], c[y] + top_right[y], c[z] },
{ c[x] + bottom_left[x], c[y] + bottom_left[y], c[z] },
{ c[x] + top_left[x], c[y] + top_left[y], c[z] },
}};
}
} // namespace floormat
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