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use crate::{
AreaLightLayout, AreaLightRaw, DirLightLayout, DirectionalLightRaw,
GpuRenderer, GraphicsError, InstanceBuffer, LightRenderPipeline, Lights,
LightsVertex, MAX_AREA_LIGHTS, MAX_DIR_LIGHTS, OrderedIndex,
StaticVertexBuffer,
};
use std::{iter, mem};
use wgpu::util::{DeviceExt, align_to};
/// Instance Buffer Setup for [`Lights`].
///
#[derive(Debug)]
pub struct LightRenderer {
/// Instance Buffer holding all Rendering information for [`Lights`].
pub buffer: InstanceBuffer<LightsVertex>,
/// Uniform buffer for the array of [`crate::AreaLight`]'s.
area_buffer: wgpu::Buffer,
/// Uniform buffer for the array of [`crate::DirectionalLight`]'s.
dir_buffer: wgpu::Buffer,
/// Uniform buffer BindGroup for the array of [`crate::AreaLight`]'s.
area_bind_group: wgpu::BindGroup,
/// Uniform buffer BindGroup for the array of [`crate::DirectionalLight`]'s.
dir_bind_group: wgpu::BindGroup,
}
impl LightRenderer {
/// Creates a new [`LightRenderer`].
///
pub fn new(renderer: &mut GpuRenderer) -> Result<Self, GraphicsError> {
// The size + Padding == 32.
let area_alignment: usize =
align_to(mem::size_of::<AreaLightRaw>(), 32) as usize;
// The size + Padding == 48.
let dir_alignment: usize =
align_to(mem::size_of::<DirectionalLightRaw>(), 48) as usize;
let area: Vec<u8> =
iter::repeat_n(0u8, MAX_AREA_LIGHTS * area_alignment).collect();
let area_buffer = renderer.device().create_buffer_init(
&wgpu::util::BufferInitDescriptor {
label: Some("Area Light buffer"),
contents: &area, //2000
usage: wgpu::BufferUsages::UNIFORM
| wgpu::BufferUsages::COPY_DST,
},
);
let dirs: Vec<u8> =
iter::repeat_n(0u8, MAX_DIR_LIGHTS * dir_alignment).collect();
let dir_buffer = renderer.device().create_buffer_init(
&wgpu::util::BufferInitDescriptor {
label: Some("Directional Light buffer"),
contents: &dirs, //2000
usage: wgpu::BufferUsages::UNIFORM
| wgpu::BufferUsages::COPY_DST,
},
);
// Create the bind group layout for the area lights.
let layout = renderer.create_layout(AreaLightLayout);
// Create the bind group.
let area_bind_group =
renderer
.device()
.create_bind_group(&wgpu::BindGroupDescriptor {
layout: &layout,
entries: &[wgpu::BindGroupEntry {
binding: 0,
resource: area_buffer.as_entire_binding(),
}],
label: Some("area_lights_bind_group"),
});
// Create the bind group layout for the directional lights.
let layout = renderer.create_layout(DirLightLayout);
// Create the bind group.
let dir_bind_group =
renderer
.device()
.create_bind_group(&wgpu::BindGroupDescriptor {
layout: &layout,
entries: &[wgpu::BindGroupEntry {
binding: 0,
resource: dir_buffer.as_entire_binding(),
}],
label: Some("dir_lights_bind_group"),
});
Ok(Self {
buffer: InstanceBuffer::new(renderer.gpu_device(), 32),
dir_buffer,
area_buffer,
area_bind_group,
dir_bind_group,
})
}
/// Adds a Buffer [`OrderedIndex`] to the Rendering Store to get processed.
/// This must be done before [`LightRenderer::finalize`] but after [`Lights::update`] in order for it to Render.
///
/// # Arguments
/// - index: The [`OrderedIndex`] of the Object we want to render.
/// - buffer_layer: The Buffer Layer we want to add this Object too.
///
pub fn add_buffer_store(
&mut self,
renderer: &GpuRenderer,
index: OrderedIndex,
buffer_layer: usize,
) {
self.buffer.add_buffer_store(renderer, index, buffer_layer);
}
/// Finalizes the Buffer by processing staged [`OrderedIndex`]'s and uploading it to the GPU.
/// Must be called after all the [`LightRenderer::add_buffer_store`]'s.
///
pub fn finalize(&mut self, renderer: &mut GpuRenderer) {
self.buffer.finalize(renderer)
}
/// Updates a [`Lights`] and adds its [`OrderedIndex`] to staging using [`LightRenderer::add_buffer_store`].
/// This must be done before [`LightRenderer::finalize`] in order for it to Render.
///
/// # Arguments
/// - lights: [`Lights`] we want to update and prepare for rendering.
/// - buffer_layer: The Buffer Layer we want to add this Object too.
///
pub fn update(
&mut self,
lights: &mut Lights,
renderer: &mut GpuRenderer,
buffer_layer: usize,
) {
let index = lights.update(
renderer,
&mut self.area_buffer,
&mut self.dir_buffer,
);
self.add_buffer_store(renderer, index, buffer_layer);
}
}
/// Trait used to Grant Direct [`Lights`] Rendering to [`wgpu::RenderPass`]
pub trait RenderLights<'a, 'b>
where
'b: 'a,
{
/// Renders the all [`Lights`]'s within the buffer layer to screen that have been processed and finalized.
///
fn render_lights(
&mut self,
renderer: &'b GpuRenderer,
buffer: &'b LightRenderer,
buffer_layer: usize,
);
}
impl<'a, 'b> RenderLights<'a, 'b> for wgpu::RenderPass<'a>
where
'b: 'a,
{
fn render_lights(
&mut self,
renderer: &'b GpuRenderer,
buffer: &'b LightRenderer,
buffer_layer: usize,
) {
if let Some(Some(details)) = buffer.buffer.buffers.get(buffer_layer)
&& buffer.buffer.count() > 0
{
self.set_bind_group(1, &buffer.area_bind_group, &[]);
self.set_bind_group(2, &buffer.dir_bind_group, &[]);
self.set_vertex_buffer(1, buffer.buffer.instances(None));
self.set_pipeline(
renderer.get_pipelines(LightRenderPipeline).unwrap(),
);
self.draw_indexed(
0..StaticVertexBuffer::index_count(),
0,
details.start..details.end,
);
}
}
}