bevy_render 0.1.0

Provides rendering functionality for Bevy Engine
Documentation 
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use bevy_math::{Mat4, PerspectiveRh};
use bevy_property::{Properties, Property};
use serde::{Deserialize, Serialize};
use super::DepthCalculation;

pub trait CameraProjection {
    fn get_projection_matrix(&self) -> Mat4;
    fn update(&mut self, width: usize, height: usize);
    fn depth_calculation(&self) -> DepthCalculation;
}

#[derive(Debug, Clone, Properties)]
pub struct PerspectiveProjection {
    pub fov: f32,
    pub aspect_ratio: f32,
    pub near: f32,
    pub far: f32,
}

impl CameraProjection for PerspectiveProjection {
    fn get_projection_matrix(&self) -> Mat4 {
        Mat4::perspective_rh(self.fov, self.aspect_ratio, self.near, self.far)
    }

    fn update(&mut self, width: usize, height: usize) {
        self.aspect_ratio = width as f32 / height as f32;
    }

    fn depth_calculation(&self) -> DepthCalculation {
        DepthCalculation::Distance
    }
}

impl Default for PerspectiveProjection {
    fn default() -> Self {
        PerspectiveProjection {
            fov: std::f32::consts::PI / 4.0,
            near: 1.0,
            far: 1000.0,
            aspect_ratio: 1.0,
        }
    }
}

// TODO: make this a component instead of a property
#[derive(Debug, Clone, Property, Serialize, Deserialize)]
pub enum WindowOrigin {
    Center,
    BottomLeft,
}

#[derive(Debug, Clone, Properties)]
pub struct OrthographicProjection {
    pub left: f32,
    pub right: f32,
    pub bottom: f32,
    pub top: f32,
    pub near: f32,
    pub far: f32,
    pub window_origin: WindowOrigin,
}

impl CameraProjection for OrthographicProjection {
    fn get_projection_matrix(&self) -> Mat4 {
        Mat4::orthographic_rh(
            self.left,
            self.right,
            self.bottom,
            self.top,
            self.near,
            self.far,
        )
    }

    fn update(&mut self, width: usize, height: usize) {
        match self.window_origin {
            WindowOrigin::Center => {
                let half_width = width as f32 / 2.0;
                let half_height = height as f32 / 2.0;
                self.left = -half_width;
                self.right = half_width;
                self.top = half_height;
                self.bottom = -half_height;
            }
            WindowOrigin::BottomLeft => {
                self.left = 0.0;
                self.right = width as f32;
                self.top = height as f32;
                self.bottom = 0.0;
            }
        }
    }

    fn depth_calculation(&self) -> DepthCalculation {
        DepthCalculation::ZDifference
    }
}

impl Default for OrthographicProjection {
    fn default() -> Self {
        OrthographicProjection {
            left: 0.0,
            right: 0.0,
            bottom: 0.0,
            top: 0.0,
            near: 0.0,
            far: 1000.0,
            window_origin: WindowOrigin::Center,
        }
    }
}