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use crate::camera::*;
use crate::core::*;
use crate::definition::*;
use crate::math::*;
pub struct DirectionalLight {
context: Context,
light_buffer: UniformBuffer,
shadow_texture: DepthTargetTexture2D,
shadow_camera: Option<Camera>,
}
impl DirectionalLight {
pub fn new(
context: &Context,
intensity: f32,
color: &Vec3,
direction: &Vec3,
) -> Result<DirectionalLight, Error> {
let mut light = DirectionalLight {
context: context.clone(),
light_buffer: UniformBuffer::new(context, &[3u32, 1, 3, 1, 16])?,
shadow_texture: DepthTargetTexture2D::new(
context,
1,
1,
Wrapping::ClampToEdge,
Wrapping::ClampToEdge,
DepthFormat::Depth32F,
)?,
shadow_camera: None,
};
light.set_intensity(intensity);
light.set_color(color);
light.set_direction(direction);
Ok(light)
}
pub fn set_color(&mut self, color: &Vec3) {
self.light_buffer.update(0, &color.to_slice()).unwrap();
}
pub fn set_intensity(&mut self, intensity: f32) {
self.light_buffer.update(1, &[intensity]).unwrap();
}
pub fn set_direction(&mut self, direction: &Vec3) {
self.light_buffer
.update(2, &direction.normalize().to_slice())
.unwrap();
}
pub fn direction(&self) -> Vec3 {
let d = self.light_buffer.get(2).unwrap();
vec3(d[0], d[1], d[2])
}
pub fn clear_shadow_map(&mut self) {
self.shadow_camera = None;
self.shadow_texture = DepthTargetTexture2D::new(
&self.context,
1,
1,
Wrapping::ClampToEdge,
Wrapping::ClampToEdge,
DepthFormat::Depth32F,
)
.unwrap();
self.light_buffer.update(3, &[0.0]).unwrap();
}
pub fn generate_shadow_map(
&mut self,
target: &Vec3,
frustrum_width: f32,
frustrum_height: f32,
frustrum_depth: f32,
texture_width: usize,
texture_height: usize,
geometries: &[&dyn Geometry],
) -> Result<(), Error> {
let direction = self.direction();
let up = compute_up_direction(direction);
self.shadow_camera = Some(Camera::new_orthographic(
&self.context,
target - direction.normalize() * 0.5 * frustrum_depth,
*target,
up,
frustrum_width,
frustrum_height,
frustrum_depth,
)?);
self.light_buffer.update(
4,
&shadow_matrix(self.shadow_camera.as_ref().unwrap()).to_slice(),
)?;
self.shadow_texture = DepthTargetTexture2D::new(
&self.context,
texture_width,
texture_height,
Wrapping::ClampToEdge,
Wrapping::ClampToEdge,
DepthFormat::Depth32F,
)
.unwrap();
self.shadow_texture.write(Some(1.0), || {
let viewport = Viewport::new_at_origo(texture_width, texture_height);
for geometry in geometries {
if geometry
.aabb()
.map(|aabb| self.shadow_camera.as_ref().unwrap().in_frustum(&aabb))
.unwrap_or(true)
{
geometry.render_depth(
RenderStates::default(),
viewport,
self.shadow_camera.as_ref().unwrap(),
)?;
}
}
Ok(())
})?;
self.light_buffer.update(3, &[1.0])?;
Ok(())
}
pub fn shadow_map(&self) -> &DepthTargetTexture2D {
&self.shadow_texture
}
pub fn buffer(&self) -> &UniformBuffer {
&self.light_buffer
}
}
fn shadow_matrix(camera: &Camera) -> Mat4 {
let bias_matrix = crate::Mat4::new(
0.5, 0.0, 0.0, 0.0, 0.0, 0.5, 0.0, 0.0, 0.0, 0.0, 0.5, 0.0, 0.5, 0.5, 0.5, 1.0,
);
bias_matrix * camera.projection() * camera.view()
}
fn compute_up_direction(direction: Vec3) -> Vec3 {
if vec3(1.0, 0.0, 0.0).dot(direction).abs() > 0.9 {
(vec3(0.0, 1.0, 0.0).cross(direction)).normalize()
} else {
(vec3(1.0, 0.0, 0.0).cross(direction)).normalize()
}
}