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// #![doc(html_logo_url = "https://rin.rs/logo.svg")]
// #![doc(html_favicon_url = "https://rin.rs/favicon.ico")]

#[cfg(feature="dds")]
pub extern crate dds;

#[doc(inline)]
pub use self::mesh::Mesh;
#[doc(inline)]
pub use self::mesh::IndexT;
#[doc(inline)]
pub use self::mesh::PrimitiveType;
#[doc(inline)]
pub use self::mesh::mesh;
#[doc(inline)]
pub use self::mesh::load_ply;
#[doc(inline)]
pub use self::primitives::*;
#[doc(inline)]
pub use self::path::Path2D;
#[doc(inline)]
pub use self::node::Node;
#[doc(inline)]
pub use self::node::{NodeRef, NodeMut};
#[doc(inline)]
pub use self::projection::{Projection,CoordinateOrigin};
#[doc(inline)]
pub use self::mvp::{Mvp, Model, CameraMatrices, ModelMatrices};
#[doc(inline)]
pub use self::gradient::{Gradient, LinearGradientDirection};
#[doc(inline)]
#[cfg(feature="dds")]
pub use self::dds::Dds;
#[doc(inline)]
pub use self::camera::{
    Camera, CameraExt, CameraPerspective, CameraOrthographic,
    arcball_camera::{self, ArcballCamera},
    ortho_camera::{self, OrthoCamera},
};
#[cfg(feature="ttf")]
#[doc(inline)]
pub use self::ttf::Ttf;

#[cfg(feature="ttf_rusttype")]
pub use self::ttf_rusttype as ttf;
#[cfg(feature="ttf_rusttype")]
#[doc(inline)]
pub use self::ttf::Ttf;

pub use self::vertex::*;

#[cfg(feature = "freeimage")]
pub mod freeimage;

#[cfg(feature = "freeimage")]
pub use self::freeimage as image;

#[doc(no_inline)]
#[cfg(feature = "freeimage")]
pub use self::freeimage::Image;

#[cfg(feature = "image")]
pub mod image;

#[doc(no_inline)]
#[cfg(feature = "image")]
pub use self::image::Image;


mod mesh;
mod primitives;
pub mod node;
pub mod path;
mod gradient;
pub mod vertex;
pub mod projection;
pub mod mvp;
pub mod camera;
#[cfg(feature="ttf")]
pub mod ttf;
#[cfg(all(feature="ttf_rusttype", feature="image"))]
pub mod ttf_rusttype;

use na::*;
use std::f32;
use math::Rect;
#[cfg(any(feature="gl", feature="gles", feature="webgl"))]
use glin::gl;

pub type Mesh2D = Mesh<Vertex2D>;
pub type Mesh2DColor = Mesh<Vertex2DColor>;
pub type Mesh2DTex = Mesh<Vertex2DTex>;
pub type Mesh2DTexColor = Mesh<Vertex2DTexColor>;
pub type Mesh2DTex3D = Mesh<Vertex2DTex3D>;
pub type Mesh3D = Mesh<Vertex3D>;
pub type Mesh3DColor = Mesh<Vertex3DColor>;
pub type Mesh3DColorNormal = Mesh<Vertex3DColorNormal>;
pub type Mesh3DNormal = Mesh<Vertex3DNormal>;
pub type Mesh3DTexColor = Mesh<Vertex3DTexColor>;
pub type Mesh3DTexNormal = Mesh<Vertex3DTexNormal>;
pub type Mesh3DTex = Mesh<Vertex3DTex>;

/// Z value for screen <-> world conversions
#[derive(Clone, Copy, PartialEq, Debug)]
pub enum ScreenZ{
    /// The z value is in world coordinates
    World(f32),
    /// The z value is in normalized depth
    Depth(f32),
}

/// Converts a 3d point to a projection in the screen in 2D + normalized coordinates of it's depth
pub fn world_to_screen(p: &Pnt3, screen_size: &Vec2, projection_view: &Mat4) -> (Pnt2, ScreenZ){
    let c = *projection_view * pnt4!(p, 1.0);
    let c = c.xyz() / c.w;
    let p = pnt2(((c.x + 1.0f32) / 2.0f32 * screen_size.x).round(),
         ((1.0f32 - c.y) / 2.0f32 * screen_size.y).round());
    (p, ScreenZ::Depth(c.z))
}

/// Converts a screen position + a z value in either world coordinates
/// or normalized depth into a world 3d position
pub fn screen_to_world(screen: &Pnt2, depth: ScreenZ, projection: &Mat4, view: &Mat4, viewport: &Rect<i32>) -> Pnt3 {
	//convert from screen to camera
	let x = 2.0f32 * (screen.x - viewport.pos.x as f32) / viewport.width as f32 - 1.0f32;
	let y = 1.0f32 - 2.0f32 * (screen.y - viewport.pos.y as f32) / viewport.height as f32;
    let z = match depth{
        ScreenZ::Depth(depth) => depth,
        ScreenZ::World(z) => {
            // let far = projection.column(2)[3] / (projection.column(2)[2] - 1.);
            // let near  = projection.column(2)[3] / (projection.column(2)[2] + 1.);
            // let depth = ((far + near - z / (2. * near * far)) / (far - near) + 1.) / (far - near) / 2.;
            // depth

            let w = (projection * view) * vec4(0., 0., z, 1.);
            let w = w.xyz() / w.w;
            w.z
        }
    };
    let camera_xyz = vec4(x, y, z, 1.);

	//convert camera to world
	let v4 = (projection * view).try_inverse().unwrap() * camera_xyz;
    (v4.xyz() / v4.w).to_pnt()

}

fn num_partial_min<T:PartialOrd>(a: T, b: T) -> T{
    if a<b {a} else {b}
}

fn num_partial_max<T:PartialOrd>(a: T, b: T) -> T{
    if a>b {a} else {b}
}

/// Bounding box of a set of 2d points
pub fn bounding_box<T: BaseNum>(mesh: &[Vec2<T>]) -> Rect<T>{
    if mesh.is_empty(){
        return Rect{pos: pnt2(zero(), zero()), width: zero(), height: zero()}
    }else{
        let mut iter = mesh.iter();
        let (max, min) = iter.next()
            .map(|&head| iter.fold((head, head), |(max, min), v| {
                let max_x = num_partial_max(max.x, v.x);
                let max_y = num_partial_max(max.y, v.y);
                let min_x = num_partial_min(min.x, v.x);
                let min_y = num_partial_min(min.y, v.y);
                (vec2(max_x, max_y), vec2(min_x, min_y))
            }))
            .unwrap();
        Rect{ pos: pnt2(min.x, min.y), width: max.x - min.x, height: max.y - min.y}
    }
}

/// Mesh primitive type to gl primitive type
#[cfg(feature="gl")]
pub fn primitive_type_to_gl(ty: mesh::PrimitiveType) -> u32{
    match ty{
        PrimitiveType::Triangles => gl::TRIANGLES,
        PrimitiveType::TriangleStrip => gl::TRIANGLE_STRIP,
        PrimitiveType::TriangleFan => gl::TRIANGLE_FAN,
        PrimitiveType::Lines => gl::LINES,
        PrimitiveType::LineStrip => gl::LINE_STRIP,
        PrimitiveType::LineLoop => gl::LINE_LOOP,
        PrimitiveType::LinesAdjacency => gl::LINES_ADJACENCY,
        PrimitiveType::LineStripAdjacency => gl::LINE_STRIP_ADJACENCY,
        PrimitiveType::Points => gl::POINTS,
        PrimitiveType::Patches => gl::PATCHES,
    }
}

/// Mesh primitive type to gles primitive type
#[cfg(any(feature="gles", feature="webgl"))]
pub fn primitive_type_to_gl(ty: mesh::PrimitiveType) -> u32{
    match ty{
        PrimitiveType::Triangles => gl::TRIANGLES,
        PrimitiveType::TriangleStrip => gl::TRIANGLE_STRIP,
        PrimitiveType::TriangleFan => gl::TRIANGLE_FAN,
        PrimitiveType::Lines => gl::LINES,
        PrimitiveType::LineStrip => gl::LINE_STRIP,
        PrimitiveType::LineLoop => gl::LINE_LOOP,
        PrimitiveType::Points => gl::POINTS,
        _ => unimplemented!()
    }
}