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#include "tile-atlas.hpp"
#include "compat/assert.hpp"
#include <Corrade/Containers/StringView.h>
#include <Magnum/Math/Color.h>
#include <Magnum/ImageView.h>
#include <Magnum/GL/TextureFormat.h>
namespace floormat {
tile_atlas::tile_atlas(Containers::StringView name, const ImageView2D& image, Vector2ui dims) :
name_{name},
size_{image.size()},
dims_{dims}
{
CORRADE_INTERNAL_ASSERT(dims_[0] > 0 && dims_[1] > 0);
CORRADE_INTERNAL_ASSERT(size_ % dims_ == Vector2ui{});
CORRADE_INTERNAL_ASSERT(dims_.product() < 256);
tex_.setWrapping(GL::SamplerWrapping::ClampToEdge)
.setMagnificationFilter(GL::SamplerFilter::Linear)
.setMinificationFilter(GL::SamplerFilter::Linear)
.setMaxAnisotropy(1)
.setBorderColor(Color4{1, 0, 0, 1})
.setStorage(1, GL::textureFormat(image.format()), image.size())
.setSubImage(0, {}, image);
}
std::array<Vector2, 4> tile_atlas::texcoords_for_id(std::size_t id_) const
{
const auto sz = size_/dims_;
ASSERT(id_ < sz.product());
const Vector2ui id = { (UnsignedInt)id_ % dims_[0], (UnsignedInt)id_ / dims_[0] };
const Vector2 p0(id * sz), p1(sz);
const auto x0 = p0.x(), x1 = p1.x()-1, y0 = p0.y(), y1 = p1.y()-1;
return {{
{ (x0+x1)/size_[0], (y0+y1)/size_[1] }, // bottom right
{ (x0+x1)/size_[0], y0/size_[1] }, // top right
{ x0/size_[0], (y0+y1)/size_[1] }, // bottom left
{ x0/size_[0], y0/size_[1] } // top left
}};
}
} // namespace floormat
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