mirror of
https://github.com/italicsjenga/vello.git
synced 2024-10-18 07:21:30 +11:00
47d2e0a756
Add a method to create a buffer with initial content, which requires staging buffers under the hood. This patch also changes the lower-level (Vulkan) interface to be closer to the raw Vulkan call.
38 lines
1.5 KiB
Rust
38 lines
1.5 KiB
Rust
use piet_gpu_hal::hub;
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use piet_gpu_hal::vulkan::VkInstance;
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use piet_gpu_hal::{BufferUsage, CmdBuf};
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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 session = hub::Session::new(device);
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let usage = BufferUsage::MAP_READ | BufferUsage::STORAGE;
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let src = (0..256).map(|x| x + 1).collect::<Vec<u32>>();
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let buffer = session.create_buffer_init(&src, usage).unwrap();
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let code = include_bytes!("./shader/collatz.spv");
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let pipeline = session.create_simple_compute_pipeline(code, 1).unwrap();
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let descriptor_set = session
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.create_simple_descriptor_set(&pipeline, &[&buffer])
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.unwrap();
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let query_pool = session.create_query_pool(2).unwrap();
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let mut cmd_buf = session.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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let submitted = session.run_cmd_buf(cmd_buf, &[], &[]).unwrap();
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submitted.wait().unwrap();
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let timestamps = session.fetch_query_pool(&query_pool);
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let mut dst: Vec<u32> = Default::default();
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buffer.read(&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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