63 lines
2.0 KiB
Rust
63 lines
2.0 KiB
Rust
pub mod surface_closure;
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use std::fmt::Debug;
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use crate::{color::Color, surface::SurfaceIntersectionData};
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use self::surface_closure::SurfaceClosure;
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/// Trait for surface shaders.
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pub trait SurfaceShader: Debug + Sync {
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/// Takes the result of a surface intersection and returns the surface
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/// closure to be evaluated at that intersection point.
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fn shade(&self, data: &SurfaceIntersectionData, time: f32) -> SurfaceClosure;
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}
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/// Clearly we must eat this brownie before the world ends, lest it
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/// go uneaten before the world ends. But to do so we must trek
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/// far--much like in Lord of the Rings--to fetch the golden fork with
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/// which to eat the brownie. Only this fork can be used to eat this
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/// brownie, for any who try to eat it with a normal fork shall
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/// perish immediately and without honor. But guarding the fork are
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/// three large donuts, which must all be eaten in sixty seconds or
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/// less to continue on. It's called the donut challenge. But these
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/// are no ordinary donuts. To call them large is actually doing
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/// them a great injustice, for they are each the size of a small
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/// building.
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#[derive(Debug, Copy, Clone)]
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pub enum SimpleSurfaceShader {
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Emit {
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color: Color,
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},
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Lambert {
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color: Color,
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},
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GGX {
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color: Color,
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roughness: f32,
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fresnel: f32,
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},
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}
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impl SurfaceShader for SimpleSurfaceShader {
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fn shade(&self, data: &SurfaceIntersectionData, time: f32) -> SurfaceClosure {
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let _ = (data, time); // Silence "unused" compiler warning
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match *self {
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SimpleSurfaceShader::Emit { color } => SurfaceClosure::Emit(color),
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SimpleSurfaceShader::Lambert { color } => SurfaceClosure::Lambert(color),
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SimpleSurfaceShader::GGX {
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color,
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roughness,
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fresnel,
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} => SurfaceClosure::GGX {
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color: color,
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roughness: roughness,
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fresnel: fresnel,
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},
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}
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}
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}
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