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#include "anim-atlas.hpp"
#include "compat/assert.hpp"
#include "shaders/shader.hpp"
#include "tile-defs.hpp"
#include "compat/exception.hpp"
#include <Corrade/Containers/BitArrayView.h>
#include <Corrade/Containers/StridedArrayView.h>
#include <Magnum/Math/Color.h>
#include <Magnum/GL/TextureFormat.h>
namespace floormat {
static constexpr const char name_array[][3] = { "n", "ne", "e", "se", "s", "sw", "w", "nw", };
static constexpr inline auto rot_count = size_t(rotation_COUNT);
static_assert(std::size(name_array) == rot_count);
static_assert(rot_count == 8);
uint8_t anim_atlas::rotation_to_index(StringView name)
{
for (uint8_t i = 0; i < rot_count; i++)
if (name == StringView{name_array[i]})
return i;
fm_throw("can't parse rotation name '{}'"_cf, name);
}
decltype(anim_atlas::_group_indices) anim_atlas::make_group_indices(const anim_def& a) noexcept
{
std::array<uint8_t, rot_count> array = {
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
};
const auto ngroups = a.groups.size();
for (auto i = 0uz; i < ngroups; i++)
array[rotation_to_index(a.groups[i].name)] = uint8_t(i);
return array;
}
anim_atlas::anim_atlas() noexcept = default;
anim_atlas::anim_atlas(String name, const ImageView2D& image, anim_def info) :
_name{std::move(name)}, _bitmask{make_bitmask(image)},
_info{std::move(info)}, _group_indices{make_group_indices(_info)}
{
fm_soft_assert(!_info.groups.empty());
const Size<3> size = image.pixels().size();
fm_soft_assert(size[0]*size[1] == _info.pixel_size.product());
fm_soft_assert(size[2] >= 3 && size[2] <= 4);
for (const auto pixel_size = _info.pixel_size;
const auto& group : _info.groups)
for (const auto& fr : group.frames)
{
fm_soft_assert(fr.size.product() != 0);
fm_soft_assert(fr.offset < pixel_size);
fm_soft_assert(fr.offset + fr.size <= pixel_size);
}
_tex.setLabel(_name)
.setWrapping(GL::SamplerWrapping::ClampToEdge)
.setMagnificationFilter(GL::SamplerFilter::Nearest)
.setMinificationFilter(GL::SamplerFilter::Nearest)
.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 -> const anim_group&
{
const auto group_idx = _group_indices[size_t(r)];
fm_soft_assert(group_idx != 0xff);
return _info.groups[group_idx];
}
auto anim_atlas::frame(rotation r, size_t frame) const -> const anim_frame&
{
const anim_group& g = group(r);
fm_soft_assert(frame < g.frames.size());
return g.frames[frame];
}
// get uv's for atlas frame
// ORDER: bottom left, top right, bottom left, top left
auto anim_atlas::texcoords_for_frame(rotation r, size_t i, bool mirror) 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;
if (!mirror)
return {{
{ (x0+x1) / size.x(), 1 - (y0+y1) / size.y() }, // bottom right
{ (x0+x1) / size.x(), 1 - y0 / size.y() }, // top right
{ x0 / size.x(), 1 - (y0+y1) / size.y() }, // bottom left
{ x0 / size.x(), 1 - y0 / size.y() }, // top left
}};
else
return {{
{ x0 / size.x(), 1 - (y0+y1) / size.y() }, // bottom right
{ x0 / size.x(), 1 - y0 / size.y() }, // top right
{ (x0+x1) / size.x(), 1 - (y0+y1) / size.y() }, // bottom left
{ (x0+x1) / size.x(), 1 - y0 / size.y() }, // top left
}};
}
// get vertexes for atlas frame
// ORDER: bottom left, top right, bottom left, top left
auto anim_atlas::frame_quad(const Vector3& center, rotation r, size_t i) const noexcept -> quad
{
enum : size_t { x, y, z };
const auto f = frame(r, i);
const auto gx = f.ground[x]*.5f, gy = f.ground[y]*.5f;
const auto size = Vector2(f.size);
const auto sx = size[x]*.5f, sy = 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] },
}};
}
void anim_atlas::make_bitmask_(const ImageView2D& tex, BitArray& array)
{
const auto pixels = tex.pixels();
const auto size = pixels.size();
const auto width = size[1], height = size[0],
stride = (size_t)pixels.stride()[0], width0 = width & ~7u;
const auto* const data = (const unsigned char*)pixels.data();
auto* const dest = (unsigned char*)array.data();
fm_soft_assert(tex.pixelSize() == 4);
fm_soft_assert(pixels.stride()[1] == 4);
for (auto j = 0uz; j < height; j++)
{
constexpr unsigned char amin = 32;
auto i = 0uz;
for (; i < width0; i += 8)
{
const auto src_idx = (j*stride + i*4)+3, dst_idx = (height-j-1)*width+i >> 3;
const unsigned char* buf = data + src_idx;
auto value = (unsigned char)(
(unsigned char)(buf[0*4] >= amin) << 0 |
(unsigned char)(buf[1*4] >= amin) << 1 |
(unsigned char)(buf[2*4] >= amin) << 2 |
(unsigned char)(buf[3*4] >= amin) << 3 |
(unsigned char)(buf[4*4] >= amin) << 4 |
(unsigned char)(buf[5*4] >= amin) << 5 |
(unsigned char)(buf[6*4] >= amin) << 6 |
(unsigned char)(buf[7*4] >= amin) << 7);
dest[dst_idx] = value;
}
if (i < width)
{
dest[(height-j-1)*width+i >> 3] = 0;
do {
unsigned char alpha = data[(j*stride + i*4)+3];
array.set((height-j-1)*width + i, alpha >= amin);
} while (++i < width);
}
}
}
BitArray anim_atlas::make_bitmask(const ImageView2D& tex)
{
if (tex.pixelSize() == 3)
return {};
const auto size = tex.pixels().size();
auto array = BitArray{NoInit, size[0]*size[1]};
make_bitmask_(tex, array);
return array;
}
BitArrayView anim_atlas::bitmask() const
{
return _bitmask;
}
rotation anim_atlas::next_rotation_from(rotation r) const noexcept
{
constexpr auto count = size_t(rotation_COUNT);
for (auto i = size_t(r)+1; i < count; i++)
if (_group_indices[i] != 0xff)
return rotation(i);
for (auto i = 0uz; i < count; i++)
if (_group_indices[i] != 0xff)
return rotation(i);
fm_abort("where did the rotations go?!");
}
rotation anim_atlas::prev_rotation_from(rotation r) const noexcept
{
using ssize = std::make_signed_t<size_t>;
constexpr auto count = ssize(rotation_COUNT);
if (r < rotation_COUNT)
for (auto i = ssize(r)-1; i >= 0; i--)
if (_group_indices[size_t(i)] != 0xff)
return rotation(i);
for (auto i = count-1; i >= 0; i--)
if (_group_indices[size_t(i)] != 0xff)
return rotation(i);
fm_abort("where did the rotations go?!");
}
bool anim_atlas::check_rotation(rotation r) const noexcept
{
return r < rotation_COUNT && _group_indices[size_t(r)] < 0xff;
}
rotation anim_atlas::first_rotation() const noexcept
{
for (auto i = 0uz; i < rot_count; i++)
if (_group_indices[i] == 0)
return rotation(i);
fm_abort("unreachable! can't find first rotation");
}
} // namespace floormat
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