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https://github.com/bolero-MURAKAMI/Sprout
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Sprout.Darkroom 外部ファイルからテクスチャ読み込み機能を追加
texture_map クラス追加
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bolero-MURAKAMI
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commit
6f2be58007
7 changed files with 368 additions and 11 deletions
202
sprout/darkroom/materials/texture_map.hpp
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202
sprout/darkroom/materials/texture_map.hpp
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#ifndef SPROUT_DARKROOM_MATERIALS_TEXTURE_MAP_HPP
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#define SPROUT_DARKROOM_MATERIALS_TEXTURE_MAP_HPP
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#include <cstddef>
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#include <cstdint>
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#include <cmath>
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#include <sprout/config.hpp>
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#include <sprout/utility/value_holder.hpp>
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#include <sprout/darkroom/colors/rgb.hpp>
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namespace sprout {
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namespace darkroom {
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namespace materials {
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//
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// texture_map_interpolation
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//
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struct texture_map_interpolation {
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public:
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enum values {
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nearest_neighbor,
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bilinear,
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bicubic
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};
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};
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//
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// texture_map_placement
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//
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struct texture_map_placement {
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public:
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enum values {
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tile,
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once
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};
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};
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//
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// texture_map
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//
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template<typename Texture, typename Scale = double>
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class texture_map {
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public:
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typedef Texture texture_type;
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typedef typename texture_type::value_type result_type;
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typedef Scale unit_type;
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typedef sprout::darkroom::materials::texture_map_interpolation texture_map_interpolation;
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typedef sprout::darkroom::materials::texture_map_placement texture_map_placement;
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private:
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static SPROUT_CONSTEXPR unit_type fmod(unit_type const& n, unit_type const& d) {
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return n - std::intmax_t(n / d) * d;
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}
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private:
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sprout::value_holder<texture_type const&> texture_;
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unit_type scale_;
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unit_type offset_u_;
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unit_type offset_v_;
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result_type default_color_;
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texture_map_interpolation::values interpolation_value_;
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texture_map_placement::values placement_value_;
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private:
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SPROUT_CONSTEXPR bool is_nearest() const {
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return interpolation_value_ == texture_map_interpolation::nearest_neighbor;
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}
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SPROUT_CONSTEXPR bool is_bilinear() const {
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return interpolation_value_ == texture_map_interpolation::bilinear;
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}
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SPROUT_CONSTEXPR bool is_bicubic() const {
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return interpolation_value_ == texture_map_interpolation::bicubic;
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}
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SPROUT_CONSTEXPR bool is_tile() const {
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return placement_value_ == texture_map_placement::tile;
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}
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SPROUT_CONSTEXPR bool is_once() const {
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return placement_value_ == texture_map_placement::once;
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}
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SPROUT_CONSTEXPR result_type get_color(unit_type const& x, unit_type const& y) const {
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return is_tile()
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? texture_.get()(
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x < 0
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? texture_.get().width() - 1 - static_cast<std::size_t>(-x) % texture_.get().width()
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: static_cast<std::size_t>(x) % texture_.get().width()
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,
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y < 0
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? texture_.get().height() - 1 - static_cast<std::size_t>(-y) % texture_.get().height()
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: static_cast<std::size_t>(y) % texture_.get().height()
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)
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: x < 0 || x >= texture_.get().width()
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|| y < 0 || y >= texture_.get().height()
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? default_color_
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: texture_.get()(static_cast<std::size_t>(x), static_cast<std::size_t>(y))
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;
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}
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template<typename Unit>
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SPROUT_CONSTEXPR result_type calc_nearest(Unit const& x, Unit const& y) const {
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return get_color(x, y);
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}
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template<typename Unit>
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SPROUT_CONSTEXPR result_type calc_bilinear_1(
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Unit const& x,
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Unit const& xf,
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Unit const& xc,
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Unit const& y,
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Unit const& yf,
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Unit const& yc
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) const
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{
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return sprout::darkroom::colors::add(
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sprout::darkroom::colors::mul(
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sprout::darkroom::colors::add(
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sprout::darkroom::colors::mul(get_color(xf, yf), 1 - (x - xf)),
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sprout::darkroom::colors::mul(get_color(xc, yf), 1 - (xc - x))
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),
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1 - (y - yf)
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),
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sprout::darkroom::colors::mul(
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sprout::darkroom::colors::add(
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sprout::darkroom::colors::mul(get_color(xf, yc), 1 - (x - xf)),
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sprout::darkroom::colors::mul(get_color(xc, yc), 1 - (xc - x))
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),
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1 - (yc - y)
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)
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);
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}
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template<typename Unit>
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SPROUT_CONSTEXPR result_type calc_bilinear(Unit const& x, Unit const& y) const {
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using std::floor;
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return calc_bilinear_1(x, floor(x - 0.5), floor(x + 0.5), y, floor(y - 0.5), floor(y + 0.5));
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}
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template<typename Unit>
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SPROUT_CONSTEXPR result_type calc(Unit const& x, Unit const& y) const {
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return is_nearest() ? calc_nearest(x, y)
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: calc_bilinear(x, y)
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;
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}
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public:
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SPROUT_CONSTEXPR explicit texture_map(
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texture_type const& texture,
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unit_type const& scale = 1,
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unit_type const& offset_u = 0,
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unit_type const& offset_v = 0,
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result_type const& default_color = result_type(),
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texture_map_interpolation::values interpolation_value = texture_map_interpolation::nearest_neighbor,
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texture_map_placement::values placement_value = texture_map_placement::tile
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)
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: texture_(texture)
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, scale_(scale)
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, offset_u_(offset_u)
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, offset_v_(offset_v)
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, default_color_(default_color)
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, interpolation_value_(interpolation_value)
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, placement_value_(placement_value)
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{}
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template<typename Unit>
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SPROUT_CONSTEXPR result_type operator()(Unit const& u, Unit const& v) const {
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return calc(
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(u - offset_u_ + scale_ / 2) / scale_ * texture_.get().width(),
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(-(v - offset_v_) + scale_ / 2) / scale_ * texture_.get().height()
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);
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}
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};
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//
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// make_texture_map
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//
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template<typename Texture>
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SPROUT_CONSTEXPR sprout::darkroom::materials::texture_map<Texture>
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make_texture_map(Texture const& texture) {
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return sprout::darkroom::materials::texture_map<Texture>(texture);
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}
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template<typename Texture, typename Unit>
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SPROUT_CONSTEXPR sprout::darkroom::materials::texture_map<Texture, Unit>
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make_texture_map(
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Texture const& texture,
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Unit const& scale,
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Unit const& offset_u
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= 0
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,
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Unit const& offset_v
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= 0
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,
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typename sprout::darkroom::materials::texture_map<Texture, Unit>::result_type const& default_color
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= typename sprout::darkroom::materials::texture_map<Texture, Unit>::result_typ()
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,
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sprout::darkroom::materials::texture_map_interpolation::values interpolation_value
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= sprout::darkroom::materials::texture_map_interpolation::nearest_neighbor
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,
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sprout::darkroom::materials::texture_map_placement::values placement_value
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= sprout::darkroom::materials::texture_map_placement::tile
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)
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{
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return sprout::darkroom::materials::texture_map<Texture, Unit>(
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texture,
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scale,
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offset_u,
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offset_v,
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default_color,
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interpolation_value,
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placement_value
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);
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}
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} // namespace materials
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} // namespace darkroom
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} // namespace sprout
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#endif // #ifndef SPROUT_DARKROOM_MATERIALS_TEXTURE_MAP_HPP
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