dynamic uniform offsets

src/render/bind_group.rs

@@ -1,5 +1,7 @@
 use crate::texture::{DitherTextures, FlowmapTexture};
+use std::num::NonZeroU64;
 
+use super::types::Uniforms;
 use super::Renderer;
 
 impl Renderer
@@ -24,7 +26,11 @@ impl Renderer
             entries: &[
                 wgpu::BindGroupEntry {
                     binding: 0,
-                    resource: uniform_buffer.as_entire_binding(),
+                    resource: wgpu::BindingResource::Buffer(wgpu::BufferBinding {
+                        buffer: uniform_buffer,
+                        offset: 0,
+                        size: NonZeroU64::new(std::mem::size_of::<Uniforms>() as u64),
+                    }),
                 },
                 wgpu::BindGroupEntry {
                     binding: 1,

src/render/debug_overlay.rs

@@ -102,8 +102,7 @@ impl DebugOverlay
             cache: None,
         });
 
-        let pipeline_snow_light =
+        let pipeline_snow_light = device.create_render_pipeline(&wgpu::RenderPipelineDescriptor {
-            device.create_render_pipeline(&wgpu::RenderPipelineDescriptor {
             label: Some("Snow Light Debug Pipeline"),
             layout: Some(&snow_light_layout),
             vertex: wgpu::VertexState {

src/render/mod.rs

@@ -6,12 +6,19 @@ mod types;
 
 pub use types::{DrawCall, Pipeline, Spotlight, SpotlightRaw, Uniforms, MAX_SPOTLIGHTS};
 
+use crate::entity::EntityHandle;
+
 use crate::debug::DebugMode;
 use crate::postprocess::{create_blit_pipeline, create_fullscreen_quad, LowResFramebuffer};
 use crate::texture::{DitherTextures, FlowmapTexture};
-use pipeline::{create_debug_lines_pipeline, create_main_pipeline, create_snow_clipmap_pipeline,
+use pipeline::{
-               create_wireframe_pipeline};
+    create_debug_lines_pipeline, create_main_pipeline, create_snow_clipmap_pipeline,
+    create_wireframe_pipeline,
+};
 use std::cell::RefCell;
+use std::num::NonZeroU64;
+
+const MAX_DRAW_CALLS: usize = 64;
 
 pub struct Renderer
 {
@@ -62,6 +69,8 @@ pub struct Renderer
 
     snow_light_accumulation: Option<crate::snow_light::SnowLightAccumulation>,
     snow_light_bound: bool,
+
+    pub selected_entity: Option<EntityHandle>,
 }
 
 impl Renderer
@@ -90,8 +99,9 @@ impl Renderer
             .await
             .map_err(|_| "Failed to find adapter")?;
 
-        let wireframe_supported =
+        let wireframe_supported = adapter
-            adapter.features().contains(wgpu::Features::POLYGON_MODE_LINE);
+            .features()
+            .contains(wgpu::Features::POLYGON_MODE_LINE);
         let required_features = if wireframe_supported
         {
             wgpu::Features::POLYGON_MODE_LINE
@@ -129,7 +139,7 @@ impl Renderer
 
         let uniform_buffer = device.create_buffer(&wgpu::BufferDescriptor {
             label: Some("Uniform Buffer"),
-            size: std::mem::size_of::<Uniforms>() as wgpu::BufferAddress,
+            size: (std::mem::size_of::<Uniforms>() * MAX_DRAW_CALLS) as wgpu::BufferAddress,
             usage: wgpu::BufferUsages::UNIFORM | wgpu::BufferUsages::COPY_DST,
             mapped_at_creation: false,
         });
@@ -306,8 +316,8 @@ impl Renderer
                     visibility: wgpu::ShaderStages::VERTEX | wgpu::ShaderStages::FRAGMENT,
                     ty: wgpu::BindingType::Buffer {
                         ty: wgpu::BufferBindingType::Uniform,
-                        has_dynamic_offset: false,
+                        has_dynamic_offset: true,
-                        min_binding_size: None,
+                        min_binding_size: NonZeroU64::new(std::mem::size_of::<Uniforms>() as u64),
                     },
                     count: None,
                 },
@@ -463,15 +473,22 @@ impl Renderer
 
         let wireframe_pipeline = if wireframe_supported
         {
-            Some(create_wireframe_pipeline(&device, config.format, &bind_group_layout))
+            Some(create_wireframe_pipeline(
+                &device,
+                config.format,
+                &bind_group_layout,
+            ))
         }
         else
         {
             None
         };
 
-        let debug_lines_pipeline =
+        let debug_lines_pipeline = Some(create_debug_lines_pipeline(
-            Some(create_debug_lines_pipeline(&device, config.format, &bind_group_layout));
+            &device,
+            config.format,
+            &bind_group_layout,
+        ));
 
         let debug_overlay = Some(debug_overlay::DebugOverlay::new(&device, config.format));
 
@@ -533,6 +550,7 @@ impl Renderer
             dummy_snow_light_sampler,
             snow_light_accumulation: None,
             snow_light_bound: false,
+            selected_entity: None,
         })
     }
 
@@ -585,6 +603,9 @@ impl Renderer
                 label: Some("Render Encoder"),
             });
 
+        let uniform_size = std::mem::size_of::<Uniforms>() as u64;
+        let mut uniform_slot: u64 = 0;
+
         for (i, draw_call) in draw_calls.iter().enumerate()
         {
             let uniforms = Uniforms::new(
@@ -603,8 +624,15 @@ impl Renderer
                 &self.spotlights,
                 debug_mode.as_u32(),
             );
-            self.queue
+
-                .write_buffer(&self.uniform_buffer, 0, bytemuck::cast_slice(&[uniforms]));
+            let offset = uniform_slot * uniform_size;
+            uniform_slot += 1;
+
+            self.queue.write_buffer(
+                &self.uniform_buffer,
+                offset,
+                bytemuck::cast_slice(&[uniforms]),
+            );
 
             {
                 let mut render_pass = encoder.begin_render_pass(&wgpu::RenderPassDescriptor {
@@ -660,7 +688,7 @@ impl Renderer
                         .unwrap_or(&self.standard_pipeline),
                 };
                 render_pass.set_pipeline(pipeline);
-                render_pass.set_bind_group(0, &self.bind_group, &[]);
+                render_pass.set_bind_group(0, &self.bind_group, &[offset as u32]);
 
                 if let Some(ref displacement_bind_group) = draw_call.displacement_bind_group
                 {
@@ -686,7 +714,10 @@ impl Renderer
             {
                 for draw_call in draw_calls.iter()
                 {
-                    if matches!(draw_call.pipeline, Pipeline::SnowClipmap | Pipeline::DebugLines)
+                    if matches!(
+                        draw_call.pipeline,
+                        Pipeline::SnowClipmap | Pipeline::DebugLines
+                    )
                     {
                         continue;
                     }
@@ -707,9 +738,11 @@ impl Renderer
                         &self.spotlights,
                         4,
                     );
+                    let wire_offset = uniform_slot * uniform_size;
+                    uniform_slot += 1;
                     self.queue.write_buffer(
                         &self.uniform_buffer,
-                        0,
+                        wire_offset,
                         bytemuck::cast_slice(&[uniforms]),
                     );
 
@@ -742,7 +775,7 @@ impl Renderer
                             });
 
                         wire_pass.set_pipeline(wireframe_pipeline);
-                        wire_pass.set_bind_group(0, &self.bind_group, &[]);
+                        wire_pass.set_bind_group(0, &self.bind_group, &[wire_offset as u32]);
                         wire_pass.set_vertex_buffer(0, draw_call.vertex_buffer.slice(..));
 
                         if let Some(ref instance_buffer) = draw_call.instance_buffer
@@ -764,6 +797,99 @@ impl Renderer
             }
         }
 
+        if let Some(selected) = self.selected_entity
+        {
+            if let Some(ref wireframe_pipeline) = self.wireframe_pipeline
+            {
+                for draw_call in draw_calls.iter()
+                {
+                    if draw_call.entity != Some(selected)
+                    {
+                        continue;
+                    }
+
+                    if matches!(
+                        draw_call.pipeline,
+                        Pipeline::SnowClipmap | Pipeline::DebugLines
+                    )
+                    {
+                        continue;
+                    }
+
+                    let uniforms = Uniforms::new(
+                        draw_call.model,
+                        *view,
+                        *projection,
+                        &light_view_projections,
+                        camera_position,
+                        player_position,
+                        self.terrain_height_scale,
+                        time,
+                        self.shadow_bias,
+                        draw_call.tile_scale,
+                        draw_call.enable_dissolve,
+                        draw_call.enable_snow_light,
+                        &self.spotlights,
+                        4,
+                    );
+                    let sel_offset = uniform_slot * uniform_size;
+                    uniform_slot += 1;
+                    self.queue.write_buffer(
+                        &self.uniform_buffer,
+                        sel_offset,
+                        bytemuck::cast_slice(&[uniforms]),
+                    );
+
+                    {
+                        let mut sel_pass = encoder.begin_render_pass(&wgpu::RenderPassDescriptor {
+                            label: Some("Selection Wireframe Pass"),
+                            color_attachments: &[Some(wgpu::RenderPassColorAttachment {
+                                view: &self.framebuffer.view,
+                                resolve_target: None,
+                                ops: wgpu::Operations {
+                                    load: wgpu::LoadOp::Load,
+                                    store: wgpu::StoreOp::Store,
+                                },
+                                depth_slice: None,
+                            })],
+                            depth_stencil_attachment: Some(
+                                wgpu::RenderPassDepthStencilAttachment {
+                                    view: &self.framebuffer.depth_view,
+                                    depth_ops: Some(wgpu::Operations {
+                                        load: wgpu::LoadOp::Load,
+                                        store: wgpu::StoreOp::Store,
+                                    }),
+                                    stencil_ops: None,
+                                },
+                            ),
+                            timestamp_writes: None,
+                            occlusion_query_set: None,
+                            multiview_mask: None,
+                        });
+
+                        sel_pass.set_pipeline(wireframe_pipeline);
+                        sel_pass.set_bind_group(0, &self.bind_group, &[sel_offset as u32]);
+                        sel_pass.set_vertex_buffer(0, draw_call.vertex_buffer.slice(..));
+
+                        if let Some(ref instance_buffer) = draw_call.instance_buffer
+                        {
+                            sel_pass.set_vertex_buffer(1, instance_buffer.slice(..));
+                        }
+
+                        sel_pass.set_index_buffer(
+                            draw_call.index_buffer.slice(..),
+                            wgpu::IndexFormat::Uint32,
+                        );
+                        sel_pass.draw_indexed(
+                            0..draw_call.num_indices,
+                            0,
+                            0..draw_call.num_instances,
+                        );
+                    }
+                }
+            }
+        }
+
         if debug_mode == DebugMode::ShadowMap
         {
             if let Some(ref overlay) = self.debug_overlay
@@ -1074,3 +1200,12 @@ pub fn update_spotlights(spotlights: Vec<Spotlight>)
         renderer.spotlights = spotlights;
     });
 }
+
+pub fn set_selected_entity(entity: Option<EntityHandle>)
+{
+    GLOBAL_RENDERER.with(|r| {
+        let mut renderer = r.borrow_mut();
+        let renderer = renderer.as_mut().expect("Renderer not set");
+        renderer.selected_entity = entity;
+    });
+}

src/render/types.rs

@@ -1,6 +1,8 @@
 use bytemuck::{Pod, Zeroable};
 use glam::Mat4;
 
+use crate::entity::EntityHandle;
+
 pub const MAX_SPOTLIGHTS: usize = 4;
 
 #[repr(C)]
@@ -156,4 +158,5 @@ pub struct DrawCall
     pub enable_dissolve: bool,
     pub enable_snow_light: bool,
     pub displacement_bind_group: Option<wgpu::BindGroup>,
+    pub entity: Option<EntityHandle>,
 }

src/systems/render.rs

@@ -60,6 +60,7 @@ pub fn render_system(world: &World) -> Vec<DrawCall>
                 enable_dissolve: mesh_component.enable_dissolve,
                 enable_snow_light: mesh_component.enable_snow_light,
                 displacement_bind_group: None,
+                entity: Some(entity),
             })
         })
         .collect()