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use crate::{
AsBufferPass, AtlasSet, GpuRenderer, GraphicsError, InstanceBuffer,
MAX_MAPS, Map, MapLayout, MapRaw, MapRenderPipeline, OrderedIndex,
SetBuffers, StaticVertexBuffer, TileVertex,
};
use std::{collections::VecDeque, iter, mem};
use wgpu::util::{DeviceExt, align_to};
/// Instance Buffer Setup for [`Map`]'s.
///
#[derive(Debug)]
pub struct MapRenderer {
/// Instance Buffer holding all Rendering information for [`Map`]'s.
pub buffer: InstanceBuffer<TileVertex>,
/// Stores each unused buffer ID to be pulled into a map_index_buffer for the map ID.
pub unused_indexs: VecDeque<usize>,
/// Uniform buffer for the 500 count array of [`crate::Map`]'s base shared data.
pub(crate) map_buffer: wgpu::Buffer,
/// Uniform buffer BindGroup for the 500 count array of [`crate::Map`]'s base shared data.
map_bind_group: wgpu::BindGroup,
}
impl MapRenderer {
/// Creates a new [`MapRenderer`].
///
/// # Arguments
/// - map_count: The number of Maps to presize the instance buffer by.
///
pub fn new(
renderer: &mut GpuRenderer,
map_count: u32,
) -> Result<Self, GraphicsError> {
let map_alignment: usize =
align_to(mem::size_of::<MapRaw>(), 16) as usize;
let maps: Vec<u8> =
iter::repeat_n(0u8, MAX_MAPS * map_alignment).collect();
let map_buffer = renderer.device().create_buffer_init(
&wgpu::util::BufferInitDescriptor {
label: Some("map uniform buffer"),
contents: &maps, //500
usage: wgpu::BufferUsages::UNIFORM
| wgpu::BufferUsages::COPY_DST,
},
);
// Create the bind group layout for the map
let layout = renderer.create_layout(MapLayout);
// Create the bind group.
let map_bind_group =
renderer
.device()
.create_bind_group(&wgpu::BindGroupDescriptor {
layout: &layout,
entries: &[wgpu::BindGroupEntry {
binding: 0,
resource: map_buffer.as_entire_binding(),
}],
label: Some("map_bind_group"),
});
let mut unused_indexs = VecDeque::with_capacity(MAX_MAPS);
for i in 0..MAX_MAPS {
unused_indexs.push_back(i);
}
Ok(Self {
buffer: InstanceBuffer::with_capacity(
renderer.gpu_device(),
9_216 * map_count as usize,
144,
),
map_buffer,
map_bind_group,
unused_indexs,
})
}
/// Adds a Buffer [`OrderedIndex`] to the Rendering Store to get processed.
/// This must be done before [`MapRenderer::finalize`] but after [`Map::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 [`MapRenderer::add_buffer_store`]'s.
///
pub fn finalize(&mut self, renderer: &mut GpuRenderer) {
self.buffer.finalize(renderer);
}
/// Updates a [`Map`] and adds its [`OrderedIndex`]'s to staging using [`MapRenderer::add_buffer_store`].
/// This must be done before [`MapRenderer::finalize`] in order for it to Render.
///
/// # Arguments
/// - map: [`Map`] we want to update and prepare for rendering.
/// - atlas: [`AtlasSet`] the [`Map`] needs to render with.
/// - buffer_layers: The Buffer Layer's we want to add this Object too.
///
pub fn update(
&mut self,
map: &mut Map,
renderer: &mut GpuRenderer,
atlas: &mut AtlasSet,
buffer_layers: [usize; 2],
) {
if let Some((bottom, upper)) = map.update(renderer, atlas, self) {
self.add_buffer_store(renderer, bottom, buffer_layers[0]);
self.add_buffer_store(renderer, upper, buffer_layers[1]);
}
}
/// Returns a reference too [`wgpu::BindGroup`].
///
pub fn bind_group(&self) -> &wgpu::BindGroup {
&self.map_bind_group
}
}
/// Trait used to Grant Direct [`Map`] Rendering to [`wgpu::RenderPass`]
pub trait RenderMap<'a, 'b>
where
'b: 'a,
{
/// Renders the all [`Map`]'s within the buffer layer to screen that have been processed and finalized.
///
fn render_map(
&mut self,
renderer: &'b GpuRenderer,
buffer: &'b MapRenderer,
atlas: &'b AtlasSet,
buffer_layer: usize,
);
}
impl<'a, 'b> RenderMap<'a, 'b> for wgpu::RenderPass<'a>
where
'b: 'a,
{
fn render_map(
&mut self,
renderer: &'b GpuRenderer,
buffer: &'b MapRenderer,
atlas: &'b AtlasSet,
buffer_layer: usize,
) {
if let Some(Some(details)) = buffer.buffer.buffers.get(buffer_layer)
&& buffer.buffer.count() > 0
{
self.set_buffers(renderer.buffer_object.as_buffer_pass());
self.set_bind_group(1, atlas.bind_group(), &[]);
self.set_bind_group(2, &buffer.map_bind_group, &[]);
self.set_vertex_buffer(1, buffer.buffer.instances(None));
self.set_pipeline(
renderer.get_pipelines(MapRenderPipeline).unwrap(),
);
self.draw_indexed(
0..StaticVertexBuffer::index_count(),
0,
details.start..details.end,
);
}
}
}