time now push constant to shader

src/client/render/mod.rs

@@ -23,6 +23,7 @@ pub struct Renderer<'a> {
     voxel_pipeline: VoxelPipeline,
     timer: GPUTimer,
     camera: Camera,
+    start: std::time::Instant,
 }
 
 impl<'a> Renderer<'a> {
@@ -49,12 +50,14 @@ impl<'a> Renderer<'a> {
         let (device, queue) = pollster::block_on(adapter.request_device(
             &wgpu::DeviceDescriptor {
                 label: None,
-                required_features: wgpu::Features::TIMESTAMP_QUERY
+                required_features: wgpu::Features::PUSH_CONSTANTS
+                    | wgpu::Features::TIMESTAMP_QUERY
                     | wgpu::Features::TIMESTAMP_QUERY_INSIDE_ENCODERS
                     | wgpu::Features::TIMESTAMP_QUERY_INSIDE_PASSES,
                 required_limits: wgpu::Limits {
                     max_storage_buffer_binding_size: buf_size,
                     max_buffer_size: buf_size as u64,
+                    max_push_constant_size: 4,
                     ..Default::default()
                 },
                 memory_hints: wgpu::MemoryHints::default(),
@@ -106,6 +109,7 @@ impl<'a> Renderer<'a> {
             device,
             config,
             queue,
+            start: std::time::Instant::now(),
         }
     }
 
@@ -124,6 +128,7 @@ impl<'a> Renderer<'a> {
     }
 
     pub fn draw(&mut self) {
+        let time = self.start.elapsed();
         let mut encoder = std::mem::replace(&mut self.encoder, Self::create_encoder(&self.device));
         let output = self.surface.get_current_texture().unwrap();
         let view = output
@@ -135,7 +140,7 @@ impl<'a> Renderer<'a> {
             timestamp_writes: None,
         });
         self.timer.start_compute(&mut compute_pass, 0);
-        self.voxel_pipeline.compute(&mut compute_pass);
+        self.voxel_pipeline.compute(&mut compute_pass, time);
         self.timer.stop_compute(&mut compute_pass, 0);
         drop(compute_pass);
 

src/client/render/voxel/ray_oct/layout.rs

@@ -124,7 +124,10 @@ impl Layout {
             device.create_pipeline_layout(&wgpu::PipelineLayoutDescriptor {
                 label: Some("voxel compute"),
                 bind_group_layouts: &[&compute_bind_layout],
-                push_constant_ranges: &[],
+                push_constant_ranges: &[wgpu::PushConstantRange {
+                    range: 0..4,
+                    stages: wgpu::ShaderStages::COMPUTE,
+                }],
             });
         Self {
             view,

src/client/render/voxel/ray_oct/mod.rs

@@ -14,10 +14,7 @@ use bevy_ecs::entity::Entity;
 pub use color::*;
 use layout::Layout;
 use nalgebra::{Transform3, Translation3, Vector2};
-use std::{
-    collections::HashMap,
-    sync::{Arc, Mutex},
-};
+use std::collections::HashMap;
 use wgpu::include_wgsl;
 use {chunk::Chunk, view::View};
 
@@ -171,9 +168,11 @@ impl VoxelPipeline {
 
     pub const WORKGROUP_SIZE: u32 = 8;
 
-    pub fn compute(&self, pass: &mut wgpu::ComputePass) {
+    pub fn compute(&self, pass: &mut wgpu::ComputePass, time: std::time::Duration) {
+        let time = time.as_millis() as u32;
         pass.set_pipeline(&self.compute_pipeline);
         pass.set_bind_group(0, &self.compute_bind_group, &[]);
+        pass.set_push_constants(0, &time.to_le_bytes());
         let buf = &self.layout.texture.texture;
         let x = (buf.width() - 1) / Self::WORKGROUP_SIZE + 1;
         let y = (buf.height() - 1) / Self::WORKGROUP_SIZE + 1;

src/client/render/voxel/ray_oct/shader/compute.wgsl

@@ -9,6 +9,8 @@ var<storage, read> global_lights: array<GlobalLight>;
 @group(0) @binding(4)
 var output: texture_storage_2d<rgba8unorm, write>;
 
+var<push_constant> time: u32;
+
 struct GlobalLight {
     dir: vec3<f32>,
 };
@@ -226,22 +228,6 @@ fn cast_ray(
     return RayResult(hits, depth);
 }
 
-fn trace_chunk(
-    offset: u32,
-    inv_dir_bits: u32,
-    t: f32, t_mult: f32, inc_t: vec3<f32>,
-    min_adj: vec3<f32>
-) {
-}
-
-fn dir_to_vec(bits: u32) -> vec3<u32> {
-    return vec3<u32>(bits >> 2, (bits & 2) >> 1, bits & 1);
-}
-
-fn vec_to_dir(vec: vec3<u32>) -> u32 {
-    return vec.x * 4 + vec.y * 2 + vec.z * 1;
-}
-
 fn min_alpha(id: u32) -> f32 {
     switch id {
         case 0u: {return 0.0;}
@@ -274,7 +260,8 @@ fn shade(id: u32, pos: vec3<f32>, normal: vec3<f32>, dir_view: vec3<f32>, dist:
         case 3u: {
             let fog = min(dist / 64.0, 1.0);
             let a = 0.5;
-            let rgb = vec3<f32>(0.5, 0.5, 1.0) * (random2 * 0.2 + 0.8);
+            let rand = (sin((f32(time) / 2000.0 + random) * 6.28) + 1.0) / 2.0;
+            let rgb = vec3<f32>(0.5, 0.5, 1.0) * (rand * 0.2 + 0.8);
             color = vec4<f32>(rgb * (1.0 - fog * a), a + fog * (1.0 - a));
         }
         default: {}
@@ -291,6 +278,14 @@ fn shade(id: u32, pos: vec3<f32>, normal: vec3<f32>, dir_view: vec3<f32>, dist:
     return vec4<f32>(new_color * new_a, new_a);
 }
 
+fn dir_to_vec(bits: u32) -> vec3<u32> {
+    return vec3<u32>(bits >> 2, (bits & 2) >> 1, bits & 1);
+}
+
+fn vec_to_dir(vec: vec3<u32>) -> u32 {
+    return vec.x * 4 + vec.y * 2 + vec.z * 1;
+}
+
 fn random(pos: vec3<f32>) -> f32 {
     return fract(sin(dot(pos, vec3<f32>(12.9898, 78.233, 25.1279))) * 43758.5453123);
 }

src/util/timer.rs

@@ -20,8 +20,7 @@ impl Timer {
         self.start = Instant::now();
     }
     pub fn stop(&mut self) {
-        let duration = Instant::now() - self.start;
-        self.durs[self.pos] = Some(duration);
+        self.durs[self.pos] = Some(self.start.elapsed());
         self.times[self.pos] = Some(self.start);
         self.pos = (self.pos + 1) % self.times.len();
     }