Add multithreaded_compute test

wgpu-rs/Cargo.toml

@@ -25,3 +25,7 @@ vulkan = ["wgn/gfx-backend-vulkan"]
 [dependencies]
 wgn = { package = "wgpu-native", version = "0.2.5", path = "../wgpu-native", features = ["local", "window-winit"] }
 arrayvec = "0.4"
+
+[dev-dependencies]
+rayon = "1"
+rusty-fork = "0.2"

wgpu-rs/tests/multithreaded_compute.rs

@@ -0,0 +1,96 @@
+#[macro_use] extern crate rusty_fork;
+
+rusty_fork_test! {
+    #![rusty_fork(timeout_ms = 10000)]
+    #[test]
+    #[cfg(any(feature = "vulkan", feature = "metal", feature = "dx12"))]
+    fn multithreaded_compute() {
+        use rayon::prelude::*;
+
+        let foo: Vec<i32> = (0..1000).collect();
+        foo.par_iter().for_each(|i| {
+            println!("{}", i);
+            let numbers = vec!(100, 100, 100);
+
+            let size = (numbers.len() * std::mem::size_of::<u32>()) as u32;
+
+            let instance = wgpu::Instance::new();
+            let adapter = instance.get_adapter(&wgpu::AdapterDescriptor {
+                power_preference: wgpu::PowerPreference::Default,
+            });
+            let mut device = adapter.create_device(&wgpu::DeviceDescriptor {
+                extensions: wgpu::Extensions {
+                    anisotropic_filtering: false,
+                },
+            });
+
+            let cs_bytes = include_bytes!("./../../examples/data/collatz.comp.spv");
+            let cs_module = device.create_shader_module(cs_bytes);
+
+            let staging_buffer = device
+                .create_buffer_mapped(
+                    numbers.len(),
+                    wgpu::BufferUsageFlags::MAP_READ
+                        | wgpu::BufferUsageFlags::TRANSFER_DST
+                        | wgpu::BufferUsageFlags::TRANSFER_SRC,
+                )
+                .fill_from_slice(&numbers);
+
+            let storage_buffer = device.create_buffer(&wgpu::BufferDescriptor {
+                size,
+                usage: wgpu::BufferUsageFlags::STORAGE
+                    | wgpu::BufferUsageFlags::TRANSFER_DST
+                    | wgpu::BufferUsageFlags::TRANSFER_SRC,
+            });
+
+            let bind_group_layout = device.create_bind_group_layout(&wgpu::BindGroupLayoutDescriptor {
+                bindings: &[wgpu::BindGroupLayoutBinding {
+                    binding: 0,
+                    visibility: wgpu::ShaderStageFlags::COMPUTE,
+                    ty: wgpu::BindingType::StorageBuffer,
+                }],
+            });
+
+            let bind_group = device.create_bind_group(&wgpu::BindGroupDescriptor {
+                layout: &bind_group_layout,
+                bindings: &[wgpu::Binding {
+                    binding: 0,
+                    resource: wgpu::BindingResource::Buffer {
+                        buffer: &storage_buffer,
+                        range: 0..size,
+                    },
+                }],
+            });
+
+            let pipeline_layout = device.create_pipeline_layout(&wgpu::PipelineLayoutDescriptor {
+                bind_group_layouts: &[&bind_group_layout],
+            });
+
+            let compute_pipeline = device.create_compute_pipeline(&wgpu::ComputePipelineDescriptor {
+                layout: &pipeline_layout,
+                compute_stage: wgpu::PipelineStageDescriptor {
+                    module: &cs_module,
+                    entry_point: "main",
+                },
+            });
+
+            let mut encoder = device.create_command_encoder(&wgpu::CommandEncoderDescriptor { todo: 0 });
+            encoder.copy_buffer_to_buffer(&staging_buffer, 0, &storage_buffer, 0, size);
+            {
+                let mut cpass = encoder.begin_compute_pass();
+                cpass.set_pipeline(&compute_pipeline);
+                cpass.set_bind_group(0, &bind_group, &[]);
+                cpass.dispatch(numbers.len() as u32, 1, 1);
+            }
+            encoder.copy_buffer_to_buffer(&storage_buffer, 0, &staging_buffer, 0, size);
+
+            device.get_queue().submit(&[encoder.finish()]);
+
+            staging_buffer.map_read_async(0, size, |result: wgpu::BufferMapAsyncResult<&[u32]>| {
+                if let Ok(mapping) = result {
+                    println!("Times: {:?}", mapping.data);
+                }
+            });
+        });
+    }
+}