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use crate::camera::*;
use crate::core::*;
use crate::math::*;

pub trait Geometry {
    ///
    /// Render only the depth into the current depth render target which is useful for shadow maps or depth pre-pass.
    /// Must be called in a render target render function,
    /// for example in the callback function of [Screen::write](crate::Screen::write).
    ///
    fn render_depth(
        &self,
        render_states: RenderStates,
        viewport: Viewport,
        camera: &Camera,
    ) -> Result<(), Error>;

    ///
    /// Render the depth (scaled such that a value of 1 corresponds to max_depth) into the red channel of the current color render target which for example is used for picking.
    /// Must be called in a render target render function,
    /// for example in the callback function of [Screen::write](crate::Screen::write).
    ///
    fn render_depth_to_red(
        &self,
        render_states: RenderStates,
        viewport: Viewport,
        camera: &Camera,
        max_depth: f32,
    ) -> Result<(), Error>;

    fn aabb(&self) -> Option<AxisAlignedBoundingBox>;
}