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use glin;
use crate::gl;
use super::{Material, Renderer};
use color::{Rgba,ToRgba};
use rin_math::Vec2;
use color::consts::WHITE;
use glin::RenderSurface;
use std::cell::UnsafeCell;
use glin::uniforms;

/// Material to draw an outline of an object
///
/// To use it draw the object with the original material
/// and then with this material
///
/// Needs depth testing to be enabled when drawing the
/// original object
pub struct OutlineMaterial{
    color: Rgba<f32>,
    offset: f32,
    viewport: Vec2,
    uniforms: UnsafeCell<Vec<glin::program::Uniform>>,
}

pub struct Builder{
    color: Rgba<f32>,
    offset: f32,
    viewport: Vec2,
}

impl Builder{
    /// Creates a material builder
    ///
    /// Needs the size of the viewport used to calculate
    /// the thickness of the outline precissely
    pub fn new(viewport: Vec2) -> Builder{
        Builder{
            color: WHITE.to_rgba(),
            offset: 0.01,
            viewport,
        }
    }

    /// Width of the outline in pixels
    pub fn width(&mut self, width: f32) -> &mut Builder{
        self.offset = width;
        self
    }

    /// Color of the outline
    pub fn color<C: ToRgba>(&mut self, color: C) -> &mut Builder{
        self.color = color.to_rgba().to_standard();
        self
    }

    /// Create the material
    pub fn build(&self) -> OutlineMaterial{
        OutlineMaterial{
            color: self.color,
            offset: self.offset,
            viewport: self.viewport,
            uniforms: UnsafeCell::new(vec![]),
        }
    }
}


impl OutlineMaterial{
    /// Viewport size, used by the shader to calculate the width of the outline in pixels
    pub fn set_viewport(&mut self, viewport: Vec2){
        self.viewport = viewport;
        self.uniforms_cache().clear();
    }

    /// Viewport size, used by the shader to calculate the width of the outline in pixels
    pub fn viewport(&self) -> Vec2{
        self.viewport
    }

    /// Width of the outline in pixels
    pub fn set_width(&mut self, width: f32){
        self.offset = width;
        self.uniforms_cache().clear();
    }

    /// Width of the outline in pixels
    pub fn width(&self) -> f32{
        self.offset
    }

    /// Color of the outline
    pub fn set_color<C: ToRgba>(&mut self, color: C){
        self.color = color.to_rgba().to_standard();
        self.uniforms_cache().clear();
    }

    /// Color of the outline
    pub fn color(&self) -> Rgba<f32>{
        self.color
    }

    fn uniforms_cache(&self) -> &mut Vec<glin::program::Uniform>{
        unsafe{ &mut *self.uniforms.get() }
    }
}

impl Material for OutlineMaterial{
    fn program<R: RenderSurface>(&self, renderer: &Renderer<R>) -> &glin::Program{
        get_program(renderer)
    }

    fn uniforms<R: RenderSurface>(&self, _: &Renderer<R>) -> &[glin::program::Uniform]{
        let uniforms = self.uniforms_cache();
        if uniforms.is_empty() {
            *uniforms = uniforms!{
                color_outline: self.color,
                offset: self.offset,
                viewport: self.viewport,
            };
        }

        uniforms
    }

    fn properties(&self) -> &[glin::Property]{
    	&[glin::Property::CullFace(Some(gl::FRONT))]
    }
}

program_cache!("shaders/outline.vs.glsl", "shaders/outline.fs.glsl");