1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
|
#include "tile-atlas.hpp"
#include <Corrade/Containers/StringView.h>
#include <Magnum/ImageView.h>
#include <Magnum/GL/TextureFormat.h>
namespace Magnum::Examples {
tile_atlas::tile_atlas(const Containers::StringView& name, const ImageView2D& image, Vector2i dims) :
name_{name},
size_{image.size()},
dims_{dims}
{
CORRADE_INTERNAL_ASSERT(dims_[0] > 0 && dims_[1] > 0);
CORRADE_INTERNAL_ASSERT(size_ % dims_ == Vector2i{});
CORRADE_INTERNAL_ASSERT(dims.product() < 256);
CORRADE_INTERNAL_ASSERT(tile_size() * dims_ == size_);
tex_.setWrapping(GL::SamplerWrapping::ClampToEdge)
.setMagnificationFilter(GL::SamplerFilter::Nearest)
.setMinificationFilter(GL::SamplerFilter::Linear)
.setMaxAnisotropy(0)
.setStorage(1, GL::textureFormat(image.format()), image.size())
.setSubImage(0, {}, image);
}
std::array<Vector2, 4> tile_atlas::texcoords_for_id(std::size_t id2) const
{
const auto tile_size_ = tile_size();
auto id_ = (int)id2;
ASSERT(id_ >= 0 && id_ < dims_.product());
Vector2i id = { id_ % dims_[0], id_ / dims_[0] };
auto p0 = Vector2(id * tile_size_) / Vector2(size_);
auto p1 = Vector2(tile_size_) / Vector2(size_);
auto x0 = p0.x(), x1 = p1.x(), y0 = p0.y(), y1 = p1.y();
return {{
{ x0+x1, y0+y1 }, // bottom right
{ x0+x1, y0 }, // top right
{ x0, y0+y1 }, // bottom left
{ x0, y0 } // top left
}};
}
} // namespace Magnum::Examples
|
