refactor renderer to separate passes

1 files changed, 148 insertions, 0 deletions

diff --git a/src/renderer/debug.rs b/src/renderer/debug.rs
new file mode 100644
index 0000000..c86d35e
--- /dev/null
+++ b/src/renderer/debug.rs
@@ -0,0 +1,148 @@
+use rapier2d::pipeline::DebugRenderMode;
+
+use crate::sim::{rb_manager::debug_render::DebugVertex, sim_manager::SimManager};
+
+const DEBUG_VERTEX_ATTRIBUTES: [wgpu::VertexAttribute; 2] =
+    wgpu::vertex_attr_array![0 => Float32x2, 1 => Float32x4];
+
+fn create_debug_vertex_buffer(device: &wgpu::Device, capacity: usize) -> wgpu::Buffer {
+    device.create_buffer(&wgpu::BufferDescriptor {
+        label: Some("Debug vertex buffer"),
+        size: (capacity * size_of::<DebugVertex>()) as u64,
+        usage: wgpu::BufferUsages::VERTEX | wgpu::BufferUsages::COPY_DST,
+        mapped_at_creation: false,
+    })
+}
+
+pub struct PhysicsDebugRendererState {
+    debug_pipeline: wgpu::RenderPipeline,
+    debug_bind_group: wgpu::BindGroup,
+    debug_vertex_buffer: wgpu::Buffer,
+    debug_vertex_capacity: usize,
+
+    debug_vertex_count: usize,
+}
+
+impl PhysicsDebugRendererState {
+    pub fn update_buffers(
+        &mut self,
+        device: &wgpu::Device,
+        queue: &wgpu::Queue,
+        sim: &mut SimManager,
+        debug_render_mode: DebugRenderMode,
+    ) {
+        puffin::profile_function!();
+        let vertices = sim.rb_manager.debug_render(debug_render_mode);
+
+        if vertices.len() > self.debug_vertex_capacity {
+            self.debug_vertex_capacity = vertices.len().next_power_of_two();
+            self.debug_vertex_buffer =
+                create_debug_vertex_buffer(&device, self.debug_vertex_capacity);
+        }
+
+        queue.write_buffer(&self.debug_vertex_buffer, 0, bytemuck::cast_slice(vertices));
+
+        self.debug_vertex_count = vertices.len();
+    }
+
+    pub fn render(&self, render_pass: &mut wgpu::RenderPass) {
+        render_pass.set_pipeline(&self.debug_pipeline);
+        render_pass.set_bind_group(0, &self.debug_bind_group, &[]);
+        render_pass.set_vertex_buffer(0, self.debug_vertex_buffer.slice(..));
+        render_pass.draw(0..self.debug_vertex_count as u32, 0..1);
+    }
+
+    pub fn new(
+        device: &wgpu::Device,
+        surface_config: &wgpu::SurfaceConfiguration,
+        camera_uniform_buffer: &wgpu::Buffer,
+    ) -> Self {
+        let debug_bind_group_layout =
+            device.create_bind_group_layout(&wgpu::BindGroupLayoutDescriptor {
+                label: Some("Debug bind group layout"),
+                entries: &[
+                    // camera uniform
+                    wgpu::BindGroupLayoutEntry {
+                        ty: wgpu::BindingType::Buffer {
+                            ty: wgpu::BufferBindingType::Uniform,
+                            has_dynamic_offset: false,
+                            min_binding_size: None,
+                        },
+                        binding: 0,
+                        count: None,
+                        visibility: wgpu::ShaderStages::VERTEX,
+                    },
+                ],
+            });
+
+        let debug_bind_group = device.create_bind_group(&wgpu::BindGroupDescriptor {
+            label: Some("Debug bind group"),
+            layout: &debug_bind_group_layout,
+            entries: &[wgpu::BindGroupEntry {
+                binding: 0,
+                resource: camera_uniform_buffer.as_entire_binding(),
+            }],
+        });
+
+        let debug_shader = device.create_shader_module(wgpu::ShaderModuleDescriptor {
+            label: Some("Debug shader"),
+            source: wgpu::ShaderSource::Wgsl(include_str!("../shader/debug.wgsl").into()),
+        });
+
+        let debug_pipeline_layout =
+            device.create_pipeline_layout(&wgpu::PipelineLayoutDescriptor {
+                label: Some("Debug pipeline layout"),
+                immediate_size: 0,
+                bind_group_layouts: &[Some(&debug_bind_group_layout)],
+            });
+
+        let debug_pipeline = device.create_render_pipeline(&wgpu::RenderPipelineDescriptor {
+            label: Some("Debug pipeline"),
+            layout: Some(&debug_pipeline_layout),
+            vertex: wgpu::VertexState {
+                module: &debug_shader,
+                entry_point: Some("vs_main"),
+                buffers: &[wgpu::VertexBufferLayout {
+                    array_stride: size_of::<DebugVertex>() as wgpu::BufferAddress,
+                    step_mode: wgpu::VertexStepMode::Vertex,
+                    attributes: &DEBUG_VERTEX_ATTRIBUTES,
+                }],
+                compilation_options: wgpu::PipelineCompilationOptions::default(),
+            },
+            fragment: Some(wgpu::FragmentState {
+                module: &debug_shader,
+                entry_point: Some("fs_main"),
+                targets: &[Some(wgpu::ColorTargetState {
+                    format: surface_config.format,
+                    blend: Some(wgpu::BlendState::ALPHA_BLENDING),
+                    write_mask: wgpu::ColorWrites::ALL,
+                })],
+                compilation_options: wgpu::PipelineCompilationOptions::default(),
+            }),
+            primitive: wgpu::PrimitiveState {
+                topology: wgpu::PrimitiveTopology::LineList,
+                strip_index_format: None,
+                front_face: wgpu::FrontFace::Ccw,
+                cull_mode: None,
+                polygon_mode: wgpu::PolygonMode::Fill,
+                unclipped_depth: false,
+                conservative: false,
+            },
+            depth_stencil: None,
+            multisample: wgpu::MultisampleState::default(),
+            multiview_mask: None,
+            cache: None,
+        });
+
+        let debug_vertex_capacity = 4096;
+        let debug_vertex_buffer = create_debug_vertex_buffer(&device, debug_vertex_capacity);
+
+        PhysicsDebugRendererState {
+            debug_pipeline,
+            debug_bind_group,
+            debug_vertex_buffer,
+            debug_vertex_capacity,
+            debug_vertex_count: 0,
+        }
+    }
+}