obrah 2.2.0

High-level Rust wrapper around OpenCL using OBWIO
Documentation 
1
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
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128

use obwio::*;
use crate::runtime::Env;
use std::ffi::CString;
use crate::data::Buffer;
use std::ffi::c_void;


/// setarg() sets an argument. For scalar values, use setarg_scalar().
/// The third parameter, arg, is the 0-based index of the kernel argument. 
/// 
/// # Examples
/// 
/// ```rust
/// use obrah::kernel;
/// use obrah::runtime;
/// use obrah::data;
/// use obrah::runtime::Env;
/// 
/// fn main() {
///     let mut env = Env::new();
///     env.use_kernel("examples/vecadd_kernel.cl");
///     env.program();
///     kernel::make_kernel(&mut env, "vec_add");
///     //kernel::make_kernel(&mut env, "kernel_name");
/// 
///     let mut a = vec![7.0f32, 8.0, 2.0, 6.0];
///     let mut b = vec![134.0f32, 134.11, 34.8, 112.9];
///     let mut result = vec![0.0f32; a.len()];
/// 
///     // Buffers
///     let mut buf_a = data::Buffer::new(&mut env, &mut a);
///     let mut buf_b = data::Buffer::new(&mut env, &mut b);
///     let mut buf_result = data::Buffer::new(&mut env, &mut result);
/// 
///      // Send data to GPU
///     buf_a.to(&a, &mut env);
///     buf_b.to(&b, &mut env);
/// 
///     // Set kernel arguments
///     kernel::setarg(&env, &mut buf_a, 0);
///     kernel::setarg(&env, &mut buf_b, 1);
///     kernel::setarg(&env, &mut buf_result, 2);
/// }
/// ```
/// 
pub fn setarg(env: &Env, buffer: &Buffer, arg: usize) {
    unsafe {
        let size = std::mem::size_of::<cl_mem>();
        let buf_ptr: *const std::ffi::c_void = &buffer.buffer as *const _ as *const _;
        clSetKernelArg(env.kernel, arg as u32, size, buf_ptr as *const _);
        if env.err != 0 {
            panic!("OpenCL error: {}", env.err);
        }
    }
}


use std::ffi::CStr;
use std::ptr;

pub fn firstdevice() {
    unsafe {
        // Get platform
        let mut num_platforms = 0;
        clGetPlatformIDs(0, ptr::null_mut(), &mut num_platforms);
        let mut platforms = vec![std::ptr::null_mut(); num_platforms as usize];
        clGetPlatformIDs(num_platforms, platforms.as_mut_ptr(), ptr::null_mut());

        // Get devices
        let mut num_devices = 0;
        clGetDeviceIDs(platforms[0], CL_DEVICE_TYPE_ALL.into(), 0, ptr::null_mut(), &mut num_devices);
        let mut devices = vec![std::ptr::null_mut(); num_devices as usize];
        clGetDeviceIDs(platforms[0], CL_DEVICE_TYPE_ALL.into(), num_devices, devices.as_mut_ptr(), ptr::null_mut());

        // Get device name
        let mut size = 0;
        clGetDeviceInfo(devices[0], CL_DEVICE_NAME, 0, ptr::null_mut(), &mut size);
        let mut name_buf = vec![0u8; size];
        clGetDeviceInfo(devices[0], CL_DEVICE_NAME, size, name_buf.as_mut_ptr() as *mut _, ptr::null_mut());

        let name = CStr::from_bytes_with_nul(&name_buf).unwrap();
        println!("First OpenCL device: {}", name.to_str().unwrap());
    }
}

/// Set a scalar argument.
/// Scalar arguments are single-data types, such as
/// floats and integers.
/// They cannot be read from.
pub fn setarg_scalar<T>(env: &Env, val: &T, arg: usize) {
    unsafe {
        let size = std::mem::size_of::<T>();
        clSetKernelArg(env.kernel, arg as u32, size, val as *const T as *const c_void);
        if env.err != 0 {
            panic!("OpenCL error: {}", env.err);
        }
    }
}

/// Run the kernel! Simply input the number of threads.
pub fn run_kernel(env: &mut Env, threads: usize) {
    unsafe {
        let global_work_size: [usize; 1] = [threads];
        clEnqueueNDRangeKernel(
            env.queue,
            env.kernel,
            1,
            std::ptr::null(),
            global_work_size.as_ptr(),
            std::ptr::null(),
            0,
            std::ptr::null_mut(),
            std::ptr::null_mut(),
        );
    }
}


/// Make the kernel.
pub fn make_kernel(env: &mut Env, name: &str) {
    unsafe {
        let cname = CString::new(name).unwrap();
        env.kernel = clCreateKernel(env.program, cname.as_ptr(), &mut env.err);
        if env.err != 0 {
            panic!("OpenCL error: {}", env.err);
        }
    }
}