Start support for multiple point light casters

src/render/light/mod.rs

@@ -1,17 +1,193 @@
 pub mod point;
+use std::{collections::{VecDeque, HashMap}, num::NonZeroU64};
+
+use edict::query::EpochOf;
 pub use point::*;
+use tracing::debug;
+use wgpu::util::DeviceExt;
 
-use crate::math::Transform;
+use std::mem;
 
-#[repr(C)]
-#[derive(Debug, Copy, Clone, bytemuck::Pod, bytemuck::Zeroable)]
-pub struct LightUniform {
-    pub position: glam::Vec3,
-    // Due to uniforms requiring 16 byte (4 float) spacing, we need to use a padding field here
-    pub(crate) _padding: u32,
-    pub color: glam::Vec3,
-    // Due to uniforms requiring 16 byte (4 float) spacing, we need to use a padding field here
-    pub(crate) _padding2: u32,
+use crate::{math::Transform, ecs::components::TransformComponent};
+
+pub struct LightBuffer {
+    pub bind_group: wgpu::BindGroup,
+    /// The buffer on the gpu storing the lights
+    buffer: wgpu::Buffer,
+    device_limits: wgpu::Limits,
+    /// The max amount of light casters that could fit in this buffer.
+    pub max_count: usize,
+    /// The current amount of light casters in this buffer.
+    pub current_count: usize,
+    /// The buffer index for a specific entity/caster.
+    used_indexes: HashMap<edict::EntityId, usize>,
+    /// Indexes that were being used but are no longer needed.
+    dead_indexes: VecDeque<usize>,
+}
+
+impl LightBuffer {
+    pub fn new<U>(device: &wgpu::Device, layout: &wgpu::BindGroupLayout, max_count: usize) -> Self
+    where
+        U: Default + bytemuck::Pod + bytemuck::Zeroable
+    {
+        let device_limits = device.limits();
+
+        let buffer = device.create_buffer(
+            &wgpu::BufferDescriptor {
+                label: Some("Light buffer"),
+                usage: wgpu::BufferUsages::UNIFORM | wgpu::BufferUsages::COPY_DST,
+                size: (mem::size_of::<U>() * max_count) as u64,//render_limits.max_uniform_buffer_binding_size as u64,
+                mapped_at_creation: false,
+                /* label: Some("Light Buffer"),
+                contents: bytemuck::cast_slice(&[U::default()]),
+                usage: wgpu::BufferUsages::UNIFORM | wgpu::BufferUsages::COPY_DST, */
+            }
+        );
+
+        /* let bind_group = device.create_bind_group(&wgpu::BindGroupDescriptor {
+            layout,
+            entries: &[
+                wgpu::BindGroupEntry {
+                    binding: 0,
+                    resource: buffer.as_entire_binding(),
+                }
+            ],
+            label: Some("light_bind_group"),
+        }); */
+
+        let stride = device_limits.min_uniform_buffer_offset_alignment as usize + mem::size_of::<U>();
+        let bind_group = device.create_bind_group(&wgpu::BindGroupDescriptor {
+            layout: &layout,
+            entries: &[
+                wgpu::BindGroupEntry {
+                    binding: 0,
+                    resource: wgpu::BindingResource::Buffer(
+                            wgpu::BufferBinding {
+                            buffer: &buffer,
+                            offset: 0,
+                            size: Some(NonZeroU64::new(stride as u64).unwrap())
+                        }
+                    )
+                }
+            ],
+            label: Some("light_bind_group"),
+        });
+
+
+        Self {
+            buffer,
+            bind_group,
+            device_limits,
+            max_count,
+            current_count: 0,
+            used_indexes: HashMap::new(),
+            dead_indexes: VecDeque::new(),
+        }
+    }
+
+    pub fn has_light(&self, entity: edict::EntityId) -> bool {
+        self.used_indexes.contains_key(&entity)
+    }
+
+    /// Update an existing light in the light buffer.
+    pub fn update_light(&mut self, queue: &wgpu::Queue, entity: edict::EntityId, light: &PointLightUniform) {
+        let buffer_idx = *self.used_indexes.get(&entity)
+            .expect("Entity for Light is not in buffer!");
+
+        let offset = buffer_idx as u64 * self.device_limits.min_uniform_buffer_offset_alignment as u64;
+        queue.write_buffer(&self.buffer, offset, bytemuck::bytes_of(light));
+    }
+
+    /// Add a new light to the light buffer.
+    pub fn add_light(&mut self, queue: &wgpu::Queue, entity: edict::EntityId, light: &PointLightUniform) {
+        let buffer_idx = match self.dead_indexes.pop_front() {
+            Some(i) => i,
+            None => {
+                let i = self.current_count;
+                self.current_count += 1;
+                i
+            },
+        };
+        
+        self.used_indexes.insert(entity, buffer_idx);
+        self.update_light(queue, entity, light);
+    }
+
+    /// Update, or add a new caster, to the light buffer.
+    pub fn update_or_add(&mut self, queue: &wgpu::Queue, entity: edict::EntityId, light: &PointLightUniform) {
+        if self.used_indexes.contains_key(&entity) {
+            self.update_light(queue, entity, light);
+        } else {
+            self.add_light(queue, entity, light);
+        }
+    }
+
+    pub fn remove_light(&mut self, queue: &wgpu::Queue, entity: edict::EntityId) {
+        todo!() // TODO
+    }
+
+    pub fn prune_dead_lights(&mut self, queue: &wgpu::Queue, entity: edict::EntityId) {
+        todo!() // TODO
+    }
+}
+
+pub struct LightUniformBuffers {
+    pub bindgroup_layout: wgpu::BindGroupLayout,
+    pub point_lights: LightBuffer,
+    //spotlights: LightBuffer,
+    //directional_light
+}
+
+impl LightUniformBuffers {
+    pub fn new(device: &wgpu::Device) -> Self {
+        let bindgroup_layout = device.create_bind_group_layout(&wgpu::BindGroupLayoutDescriptor {
+            entries: &[
+                wgpu::BindGroupLayoutEntry {
+                    binding: 0,
+                    visibility: wgpu::ShaderStages::VERTEX | wgpu::ShaderStages::FRAGMENT,
+                    ty: wgpu::BindingType::Buffer {
+                        ty: wgpu::BufferBindingType::Uniform,
+                        has_dynamic_offset: false,
+                        min_binding_size: None,
+                    },
+                    count: None,
+                }
+            ],
+            label: Some("light_bind_group_layout"),
+        });
+
+        let point_lights = LightBuffer::new::<PointLightUniform>(device, &bindgroup_layout, 10);
+
+        Self {
+            bindgroup_layout,
+            point_lights,
+        }
+    }
+
+    pub fn update_lights(&mut self, queue: &wgpu::Queue, world: &edict::World) {
+        let now_epoch = world.epoch();
+        for (entity, point_light, transform, light_epoch, transform_epoch)
+                in world.query::<(edict::Entities, &PointLight, &TransformComponent, EpochOf<PointLight>, EpochOf<TransformComponent>)>().iter() {
+
+            /* if !self.point_lights.has_light(entity) || light_epoch == now_epoch || transform_epoch == now_epoch {
+                debug!("Updated light after update!");
+                let uniform = PointLightUniform::from_bundle(point_light, &transform.transform);
+                self.point_lights.update_or_add(queue, entity, &uniform);
+            } */
+            let uniform = PointLightUniform::from_bundle(point_light, &transform.transform);
+            self.point_lights.update_or_add(queue, entity, &uniform);
+        }
+    }
+
+    // Binds the light buffer to the render pass.
+    // 
+    // Parameters:
+    // * `render_pass` - The render pass to bind the buffers to.
+    // * `point_bind_index` - The bind group index that the point light buffers will be bound to.
+    /* pub fn bind_lights<'a, 'b: 'a>(&'a mut self, render_pass: &'b mut wgpu::RenderPass<'b>, point_bind_index: u32) {
+        render_pass.set_bind_group(point_bind_index, &self.point_lights.bind_group, &[]);
+        //render_pass.set_bind_group(3, &self.point_light_bind_group, &[]);
+    } */
 }
 
 #[repr(C)]

src/render/renderer.rs

@@ -22,7 +22,7 @@ use crate::render::light::PointLightUniform;
 
 use super::camera::{RenderCamera, CameraUniform};
 use super::desc_buf_lay::DescVertexBufferLayout;
-use super::light::{LightUniform, PointLight};
+use super::light::{PointLight, LightUniformBuffers};
 use super::texture::RenderTexture;
 use super::transform_buffer_storage::{TransformBufferIndices, TransformBuffers};
 use super::vertex::Vertex;
@@ -91,9 +91,7 @@ pub struct BasicRenderer {
     default_texture_bind_group: BindGroup,
     depth_buffer_texture: RenderTexture,
 
-    point_light_buffer: wgpu::Buffer,
-    point_light_bind_group_layout: BindGroupLayout,
-    point_light_bind_group: BindGroup,
+    light_buffers: LightUniformBuffers,
 }
 
 impl BasicRenderer {
@@ -243,41 +241,6 @@ impl BasicRenderer {
             next_indices: TransformBufferIndices { buffer_index: 0, transform_index: 0 },
         };
 
-        let point_light_buffer = device.create_buffer_init(
-            &wgpu::util::BufferInitDescriptor {
-                label: Some("Point Light Buffer"),
-                contents: bytemuck::cast_slice(&[PointLightUniform::default()]),
-                usage: wgpu::BufferUsages::UNIFORM | wgpu::BufferUsages::COPY_DST,
-            }
-        );
-
-        let point_light_bind_group_layout = device.create_bind_group_layout(&wgpu::BindGroupLayoutDescriptor {
-            entries: &[
-                wgpu::BindGroupLayoutEntry {
-                    binding: 0,
-                    visibility: wgpu::ShaderStages::VERTEX | wgpu::ShaderStages::FRAGMENT,
-                    ty: wgpu::BindingType::Buffer {
-                        ty: wgpu::BufferBindingType::Uniform,
-                        has_dynamic_offset: false,
-                        min_binding_size: None,
-                    },
-                    count: None,
-                }
-            ],
-            label: Some("point_light_bind_group_layout"),
-        });
-        
-        let point_light_bind_group = device.create_bind_group(&wgpu::BindGroupDescriptor {
-            layout: &point_light_bind_group_layout,
-            entries: &[
-                wgpu::BindGroupEntry {
-                    binding: 0,
-                    resource: point_light_buffer.as_entire_binding(),
-                }
-            ],
-            label: Some("point_light_bind_group"),
-        });
-
         let camera_buffer = device.create_buffer_init(
             &wgpu::util::BufferInitDescriptor {
                 label: Some("Camera Buffer"),
@@ -335,6 +298,8 @@ impl BasicRenderer {
             }
         );
 
+        let light_uniform_buffers = LightUniformBuffers::new(&device);
+
         let mut s = Self {
             window,
             surface,
@@ -366,9 +331,7 @@ impl BasicRenderer {
             depth_buffer_texture: depth_texture,
             entity_last_transforms: HashMap::new(),
 
-            point_light_buffer,
-            point_light_bind_group_layout,
-            point_light_bind_group,
+            light_buffers: light_uniform_buffers,
         };
 
         // create the default pipelines
@@ -376,7 +339,7 @@ impl BasicRenderer {
         pipelines.insert(0, Arc::new(FullRenderPipeline::new(&s.device, &s.config, &shader, 
             vec![super::vertex::Vertex::desc(),],
             vec![&s.texture_bind_group_layout, &s.transform_bind_group_layout, &camera_bind_group_layout,
-            &s.point_light_bind_group_layout])));
+            &s.light_buffers.bindgroup_layout])));
         s.render_pipelines = pipelines;
 
         s
@@ -647,10 +610,7 @@ impl Renderer for BasicRenderer {
             warn!("Missing camera!");
         }
 
-        for (point_light, transform) in main_world.query::<(&PointLight, &TransformComponent)>().iter() {
-            let uniform = PointLightUniform::from_bundle(point_light, &transform.transform);
-            self.queue.write_buffer(&self.point_light_buffer, 0, bytemuck::cast_slice(&[uniform]));
-        }
+        self.light_buffers.update_lights(&self.queue, &main_world);
     }
 
     fn render(&mut self) -> Result<(), wgpu::SurfaceError> {
@@ -711,7 +671,10 @@ impl Renderer for BasicRenderer {
                     render_pass.set_bind_group(2, &self.camera_bind_group, &[]);
                     
                     // bind light
-                    render_pass.set_bind_group(3, &self.point_light_bind_group, &[]);
+                    //render_pass.set_bind_group(3, &self.point_light_bind_group, &[]);
+                    render_pass.set_bind_group(3, &self.light_buffers.point_lights.bind_group, &[]);
+                    ////self.light_buffers.bind_lights(&mut render_pass, 3);
+
         
                     // if this mesh uses indices, use them to draw the mesh
                     if let Some((idx_type, indices)) = buffers.buffer_indices.as_ref() {

src/render/shaders/base.wgsl

@@ -1,5 +1,7 @@
 // Vertex shader
 
+const max_light_count: i32 = 10;
+
 struct VertexInput {
     @location(0) position: vec3<f32>,
     @location(1) tex_coords: vec2<f32>,
@@ -31,10 +33,10 @@ struct PointLight {
 var<uniform> u_model_transform: mat4x4<f32>;
 
 @group(2) @binding(0)
-var<uniform> camera: CameraUniform;
+var<uniform> u_camera: CameraUniform;
 
 @group(3) @binding(0)
-var<uniform> point_light: PointLight;
+var<uniform> u_point_lights: array<PointLight, max_light_count>;
 
 @vertex
 fn vs_main(
@@ -43,7 +45,7 @@ fn vs_main(
     var out: VertexOutput;
     
     out.tex_coords = model.tex_coords;
-    out.clip_position = camera.view_proj * u_model_transform * vec4<f32>(model.position, 1.0);
+    out.clip_position = u_camera.view_proj * u_model_transform * vec4<f32>(model.position, 1.0);
     
     out.world_normal = (u_model_transform * vec4<f32>(model.normal, 0.0)).xyz;
 
@@ -61,38 +63,45 @@ var t_diffuse: texture_2d<f32>;
 @group(0)@binding(1)
 var s_diffuse: sampler;
 
-//@group(3) @binding(0)
-//var<uniform> point_light: PointLight;
-
 @fragment
 fn fs_main(in: VertexOutput) -> @location(0) vec4<f32> {
+    let object_color: vec4<f32> = textureSample(t_diffuse, s_diffuse, in.tex_coords);
+
+    var light_res = vec3<f32>(0.0);
+    for (var i = 0; i < 1; i++) {
+        light_res += blinn_phong_point_light(in.world_position, in.world_normal, u_point_lights[i]);
+    }
+    let light_object_res = light_res * object_color.xyz;
+
+    return vec4<f32>(light_object_res, object_color.a);
+}
+
+fn blinn_phong_point_light(world_pos: vec3<f32>, world_norm: vec3<f32>, point_light: PointLight) -> vec3<f32> {
     let light_color = point_light.color.xyz;
     let light_pos = point_light.position.xyz;
-    let camera_view_pos = camera.view_pos.xyz;
-
-    let object_color: vec4<f32> = textureSample(t_diffuse, s_diffuse, in.tex_coords);
+    let camera_view_pos = u_camera.view_pos.xyz;
 
     // We don't need (or want) much ambient light, so 0.1 is fine
     let ambient_strength = 0.1;
     var ambient_color = light_color * ambient_strength;
 
     //// diffuse ////
-    let light_dir = normalize(light_pos - in.world_position);
+    let light_dir = normalize(light_pos - world_pos);
 
-    let diffuse_strength = max(dot(in.world_normal, light_dir), 0.0);
+    let diffuse_strength = max(dot(world_norm, light_dir), 0.0);
     var diffuse_color = light_color * diffuse_strength;
     //// end of diffuse ////
 
     //// specular ////
-    let view_dir = normalize(camera_view_pos - in.world_position);
+    let view_dir = normalize(camera_view_pos - world_pos);
     let half_dir = normalize(view_dir + light_dir);
 
-    let specular_strength = pow(max(dot(in.world_normal, half_dir), 0.0), 32.0);
+    let specular_strength = pow(max(dot(world_norm, half_dir), 0.0), 32.0);
     var specular_color = specular_strength * light_color;
     //// end of specular ////
 
     //// point light attenuation ////
-    let distance = length(light_pos - in.world_position);
+    let distance = length(light_pos - world_pos);
     let attenuation = 1.0 / (point_light.constant + point_light.linear * distance + 
     	point_light.quadratic * (distance * distance));
 
@@ -101,7 +110,5 @@ fn fs_main(in: VertexOutput) -> @location(0) vec4<f32> {
     specular_color *= attenuation * point_light.intensity;
     //// end of point light attenuation ////
 
-    let result = (ambient_color + diffuse_color + specular_color) * object_color.xyz;
-
-    return vec4<f32>(result, object_color.a);
+    return (ambient_color + diffuse_color + specular_color);
 }