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// Copyright 2017 GFX developers
//
// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
// http://opensource.org/licenses/MIT>, at your option. This file may not be
// copied, modified, or distributed except according to those terms.
use metal::*;
use objc::rc::autoreleasepool;
use std::mem;
static LIBRARY_SRC: &str = include_str!("compute-argument-buffer.metal");
fn main() {
autoreleasepool(|| {
let device = Device::system_default().expect("no device found");
let command_queue = device.new_command_queue();
let data = [
1u32, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23,
24, 25, 26, 27, 28, 29, 30,
];
let buffer = device.new_buffer_with_data(
unsafe { mem::transmute(data.as_ptr()) },
(data.len() * mem::size_of::<u32>()) as u64,
MTLResourceOptions::CPUCacheModeDefaultCache,
);
let sum = {
let data = [0u32];
device.new_buffer_with_data(
unsafe { mem::transmute(data.as_ptr()) },
(data.len() * mem::size_of::<u32>()) as u64,
MTLResourceOptions::CPUCacheModeDefaultCache,
)
};
let command_buffer = command_queue.new_command_buffer();
let encoder = command_buffer.new_compute_command_encoder();
let library = device
.new_library_with_source(LIBRARY_SRC, &CompileOptions::new())
.unwrap();
let kernel = library.get_function("sum", None).unwrap();
let argument_encoder = kernel.new_argument_encoder(0);
let arg_buffer = device.new_buffer(
argument_encoder.encoded_length(),
MTLResourceOptions::empty(),
);
argument_encoder.set_argument_buffer(&arg_buffer, 0);
argument_encoder.set_buffer(0, &buffer, 0);
argument_encoder.set_buffer(1, &sum, 0);
let pipeline_state_descriptor = ComputePipelineDescriptor::new();
pipeline_state_descriptor.set_compute_function(Some(&kernel));
let pipeline_state = device
.new_compute_pipeline_state_with_function(
pipeline_state_descriptor.compute_function().unwrap(),
)
.unwrap();
encoder.set_compute_pipeline_state(&pipeline_state);
encoder.set_buffer(0, Some(&arg_buffer), 0);
encoder.use_resource(&buffer, MTLResourceUsage::Read);
encoder.use_resource(&sum, MTLResourceUsage::Write);
let width = 16;
let thread_group_count = MTLSize {
width,
height: 1,
depth: 1,
};
let thread_group_size = MTLSize {
width: (data.len() as u64 + width) / width,
height: 1,
depth: 1,
};
encoder.dispatch_thread_groups(thread_group_count, thread_group_size);
encoder.end_encoding();
command_buffer.commit();
command_buffer.wait_until_completed();
let ptr = sum.contents() as *mut u32;
unsafe {
assert_eq!(465, *ptr);
}
});
}
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