mirror of
https://github.com/italicsjenga/vello.git
synced 2024-10-17 23:11:30 +11:00
301abf4db7
Mostly cleaning up some comments. Also adds host barrier and a command to copy a buffer to an image (in preparation for images, see #38).
42 lines
1.7 KiB
Rust
42 lines
1.7 KiB
Rust
use piet_gpu_hal::vulkan::VkInstance;
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use piet_gpu_hal::{CmdBuf, Device, MemFlags};
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fn main() {
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let (instance, _) = VkInstance::new(None).unwrap();
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unsafe {
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let device = instance.device(None).unwrap();
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let fence = device.create_fence(false).unwrap();
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let mem_flags = MemFlags::host_coherent();
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let src = (0..256).map(|x| x + 1).collect::<Vec<u32>>();
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let buffer = device
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.create_buffer(std::mem::size_of_val(&src[..]) as u64, mem_flags)
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.unwrap();
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device.write_buffer(&buffer, &src).unwrap();
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let code = include_bytes!("./shader/collatz.spv");
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let pipeline = device.create_simple_compute_pipeline(code, 1, 0).unwrap();
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let descriptor_set = device
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.create_descriptor_set(&pipeline, &[&buffer], &[])
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.unwrap();
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let query_pool = device.create_query_pool(2).unwrap();
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let mut cmd_buf = device.create_cmd_buf().unwrap();
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cmd_buf.begin();
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cmd_buf.reset_query_pool(&query_pool);
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cmd_buf.write_timestamp(&query_pool, 0);
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cmd_buf.dispatch(&pipeline, &descriptor_set, (256, 1, 1));
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cmd_buf.write_timestamp(&query_pool, 1);
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cmd_buf.host_barrier();
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cmd_buf.finish();
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device
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.run_cmd_buf(&cmd_buf, &[], &[], Some(&fence))
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.unwrap();
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device.wait_and_reset(&[fence]).unwrap();
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let timestamps = device.reap_query_pool(&query_pool);
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let mut dst: Vec<u32> = Default::default();
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device.read_buffer(&buffer, &mut dst).unwrap();
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for (i, val) in dst.iter().enumerate().take(16) {
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println!("{}: {}", i, val);
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}
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println!("{:?}", timestamps);
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}
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}
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