|
| 1 | +#![cfg_attr( |
| 2 | + target_arch = "spirv", |
| 3 | + no_std, |
| 4 | + feature(register_attr), |
| 5 | + register_attr(spirv) |
| 6 | +)] |
| 7 | +// HACK(eddyb) can't easily see warnings otherwise from `spirv-builder` builds. |
| 8 | +#![deny(warnings)] |
| 9 | +use spirv_std::glam::UVec3; |
| 10 | +#[cfg(not(target_arch = "spirv"))] |
| 11 | +use spirv_std::macros::spirv; |
| 12 | +#[cfg(target_arch = "spirv")] |
| 13 | +use spirv_std::memory::Scope; |
| 14 | + |
| 15 | +#[doc(alias = "OpGroupNonUniformIAdd")] |
| 16 | +#[cfg(target_arch = "spirv")] |
| 17 | +#[inline] |
| 18 | +pub unsafe fn subgroup_add(value: u32) -> u32 { |
| 19 | + const EXECUTION: u32 = Scope::Subgroup as _; |
| 20 | + let mut result = 0; |
| 21 | + asm! { |
| 22 | + "%u32 = OpTypeInt 32 0", |
| 23 | + "%execution = OpConstant %u32 {execution}", |
| 24 | + "%result = OpGroupNonUniformIAdd _ %execution Reduce {value}", |
| 25 | + "OpStore {result} %result", |
| 26 | + execution = const EXECUTION, |
| 27 | + value = in(reg) value, |
| 28 | + result = in(reg) &mut result, |
| 29 | + } |
| 30 | + result |
| 31 | +} |
| 32 | + |
| 33 | +#[cfg(not(target_arch = "spirv"))] |
| 34 | +pub unsafe fn subgroup_add(_value: u32) -> u32 { |
| 35 | + panic!() |
| 36 | +} |
| 37 | + |
| 38 | +#[spirv(compute(threads(256)))] |
| 39 | +pub fn main( |
| 40 | + #[spirv(global_invocation_id)] global_invocation_id: UVec3, |
| 41 | + #[spirv(local_invocation_id)] local_invocation_id: UVec3, |
| 42 | + #[spirv(subgroup_local_invocation_id)] subgroup_local_invocation_id: u32, |
| 43 | + #[spirv(workgroup_id)] workgroup_id: UVec3, |
| 44 | + #[spirv(subgroup_id)] subgroup_id: u32, |
| 45 | + #[spirv(num_subgroups)] num_subgroups: u32, |
| 46 | + #[spirv(storage_buffer, descriptor_set = 0, binding = 0)] input: &[u32], |
| 47 | + #[spirv(storage_buffer, descriptor_set = 0, binding = 1)] output: &mut [u32], |
| 48 | + #[spirv(workgroup)] shared: &mut [u32; 256], |
| 49 | +) { |
| 50 | + let global_invocation_id_x = global_invocation_id.x as usize; |
| 51 | + let local_invocation_id_x = local_invocation_id.x as usize; |
| 52 | + let workgroup_id_x = workgroup_id.x as usize; |
| 53 | + |
| 54 | + let mut sum = 0; |
| 55 | + if global_invocation_id_x < input.len() { |
| 56 | + sum = input[global_invocation_id_x]; |
| 57 | + } |
| 58 | + sum = unsafe { subgroup_add(sum) }; |
| 59 | + if subgroup_local_invocation_id == 0 { |
| 60 | + shared[subgroup_id as usize] = sum; |
| 61 | + } |
| 62 | + unsafe { spirv_std::arch::workgroup_memory_barrier_with_group_sync() }; |
| 63 | + let mut sum = 0; |
| 64 | + if subgroup_id == 0 { |
| 65 | + if subgroup_local_invocation_id < num_subgroups { |
| 66 | + sum = shared[subgroup_local_invocation_id as usize]; |
| 67 | + } |
| 68 | + sum = unsafe { subgroup_add(sum) }; |
| 69 | + } |
| 70 | + if local_invocation_id_x == 0 { |
| 71 | + output[workgroup_id_x] = sum; |
| 72 | + } |
| 73 | +} |
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