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#pragma once
#include "src/tile-defs.hpp"
#include "shaders/texture-unit-cache.hpp"
#include <utility>
#include <Magnum/GL/AbstractShaderProgram.h>
#include <Magnum/Math/Vector2.h>
#include <Magnum/Math/Vector3.h>
#include <Magnum/Math/Vector4.h>
namespace Magnum::GL { class AbstractTexture; }
namespace floormat {
struct local_coords;
struct tile_shader final : private GL::AbstractShaderProgram
{
using Position = GL::Attribute<0, Vector3>;
using TextureCoordinates = GL::Attribute<1, Vector2>;
using LightCoord = GL::Attribute<2, Vector2>;
using Depth = GL::Attribute<3, float>;
explicit tile_shader(texture_unit_cache& tuc);
~tile_shader() override;
Vector2 scale() const { return _scale; }
tile_shader& set_scale(const Vector2& scale);
Vector2d camera_offset() const { return _camera_offset; }
tile_shader& set_camera_offset(const Vector2d& camera_offset, float depth_offset);
Vector4 tint() const { return _tint; }
tile_shader& set_tint(const Vector4& tint);
float depth_offset() const { return _depth_offset; }
static float depth_value(const local_coords& xy, float offset = 0) noexcept;
static float depth_value(float x, float y, float offset = 0) noexcept;
bool is_lightmap_enabled() const { return _enable_lightmap; }
tile_shader& set_lightmap_enabled(bool value);
template<typename T = float> static constexpr Math::Vector2<T> project(const Math::Vector3<T>& pt);
template<typename T = float> static constexpr Math::Vector2<T> unproject(const Math::Vector2<T>& px);
template<typename T, typename... Xs> decltype(auto) draw(GL::AbstractTexture& tex, T&& mesh, Xs&&... xs);
static constexpr Vector2s max_screen_tiles = {8, 8};
static constexpr float character_depth_offset = 1 + 2./64;
static constexpr float scenery_depth_offset = 1 + 2./64;
static constexpr float ground_depth_offset = 0;
static constexpr float wall_depth_offset = 1;
static constexpr float wall_west_offset = 1./64;
static constexpr float wall_side_offset = 1 - 4./64;
static constexpr float z_depth_offset = 1 + 4./64;
static constexpr float depth_tile_size = 1.f/(TILE_MAX_DIM * 2 * max_screen_tiles.product());
static constexpr float foreshortening_factor = 0.578125f;
tile_shader& set_sampler(Int sampler);
Int sampler() const { return _sampler; }
private:
void draw_pre(GL::AbstractTexture& tex);
void draw_post(GL::AbstractTexture& tex);
texture_unit_cache& tuc; // NOLINT(*-avoid-const-or-ref-data-members)
Vector2d _camera_offset;
Vector4 _tint, _real_tint;
Vector2 _scale;
Vector3 _real_camera_offset;
float _depth_offset = 0;
bool _enable_lightmap : 1 = false;
Int _sampler = 0, _real_sampler;
enum {
ScaleUniform = 0, OffsetUniform = 1, TintUniform = 2,
EnableLightmapUniform = 3,
SamplerUniform = 4, LightmapSamplerUniform = 5,
};
};
template<typename T, typename... Xs>
decltype(auto) tile_shader::draw(GL::AbstractTexture& tex, T&& mesh, Xs&&... xs)
{
draw_pre(tex);
decltype(auto) ret = GL::AbstractShaderProgram::draw(forward<T>(mesh), forward<Xs>(xs)...);
draw_post(tex);
return ret;
}
template<typename T>
constexpr Math::Vector2<T> tile_shader::project(const Math::Vector3<T>& pt)
{
static_assert(std::is_floating_point_v<T>);
const auto x = pt[0], y = pt[1], z = -pt[2];
return { x-y, (x+y+z*2)*T(foreshortening_factor) };
}
template<typename T>
constexpr Math::Vector2<T> tile_shader::unproject(const Math::Vector2<T>& px)
{
static_assert(std::is_floating_point_v<T>);
const auto X = px[0], Y = px[1];
const auto Yʹ = Y / T(foreshortening_factor);
return { X + Yʹ, Yʹ - X };
}
} // namespace floormat
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