| // Copyright 2020 The Dawn Authors |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| #include "dawn_native/QueryHelper.h" |
| |
| #include "dawn_native/BindGroup.h" |
| #include "dawn_native/BindGroupLayout.h" |
| #include "dawn_native/Buffer.h" |
| #include "dawn_native/CommandEncoder.h" |
| #include "dawn_native/ComputePassEncoder.h" |
| #include "dawn_native/ComputePipeline.h" |
| #include "dawn_native/Device.h" |
| #include "dawn_native/InternalPipelineStore.h" |
| #include "dawn_native/utils/WGPUHelpers.h" |
| |
| namespace dawn_native { |
| |
| namespace { |
| |
| // Assert the offsets in dawn_native::TimestampParams are same with the ones in the shader |
| static_assert(offsetof(dawn_native::TimestampParams, first) == 0, ""); |
| static_assert(offsetof(dawn_native::TimestampParams, count) == 4, ""); |
| static_assert(offsetof(dawn_native::TimestampParams, offset) == 8, ""); |
| static_assert(offsetof(dawn_native::TimestampParams, period) == 12, ""); |
| |
| static const char sConvertTimestampsToNanoseconds[] = R"( |
| struct Timestamp { |
| low : u32; |
| high : u32; |
| }; |
| |
| [[block]] struct TimestampArr { |
| t : array<Timestamp>; |
| }; |
| |
| [[block]] struct AvailabilityArr { |
| v : array<u32>; |
| }; |
| |
| [[block]] struct TimestampParams { |
| first : u32; |
| count : u32; |
| offset : u32; |
| period : f32; |
| }; |
| |
| [[group(0), binding(0)]] |
| var<storage, read_write> timestamps : TimestampArr; |
| [[group(0), binding(1)]] |
| var<storage, read> availability : AvailabilityArr; |
| [[group(0), binding(2)]] var<uniform> params : TimestampParams; |
| |
| |
| let sizeofTimestamp : u32 = 8u; |
| |
| [[stage(compute), workgroup_size(8, 1, 1)]] |
| fn main([[builtin(global_invocation_id)]] GlobalInvocationID : vec3<u32>) { |
| if (GlobalInvocationID.x >= params.count) { return; } |
| |
| var index = GlobalInvocationID.x + params.offset / sizeofTimestamp; |
| |
| var timestamp = timestamps.t[index]; |
| |
| // Return 0 for the unavailable value. |
| if (availability.v[GlobalInvocationID.x + params.first] == 0u) { |
| timestamps.t[index].low = 0u; |
| timestamps.t[index].high = 0u; |
| return; |
| } |
| |
| // Multiply the values in timestamps buffer by the period. |
| var period = params.period; |
| var w = 0u; |
| |
| // If the product of low 32-bits and the period does not exceed the maximum of u32, |
| // directly do the multiplication, otherwise, use two u32 to represent the high |
| // 16-bits and low 16-bits of this u32, then multiply them by the period separately. |
| if (timestamp.low <= u32(f32(0xFFFFFFFFu) / period)) { |
| timestamps.t[index].low = u32(round(f32(timestamp.low) * period)); |
| } else { |
| var lo = timestamp.low & 0xFFFFu; |
| var hi = timestamp.low >> 16u; |
| |
| var t0 = u32(round(f32(lo) * period)); |
| var t1 = u32(round(f32(hi) * period)) + (t0 >> 16u); |
| w = t1 >> 16u; |
| |
| var result = t1 << 16u; |
| result = result | (t0 & 0xFFFFu); |
| timestamps.t[index].low = result; |
| } |
| |
| // Get the nearest integer to the float result. For high 32-bits, the round |
| // function will greatly help reduce the accuracy loss of the final result. |
| timestamps.t[index].high = u32(round(f32(timestamp.high) * period)) + w; |
| } |
| )"; |
| |
| ResultOrError<ComputePipelineBase*> GetOrCreateTimestampComputePipeline( |
| DeviceBase* device) { |
| InternalPipelineStore* store = device->GetInternalPipelineStore(); |
| |
| if (store->timestampComputePipeline == nullptr) { |
| // Create compute shader module if not cached before. |
| if (store->timestampCS == nullptr) { |
| DAWN_TRY_ASSIGN( |
| store->timestampCS, |
| utils::CreateShaderModule(device, sConvertTimestampsToNanoseconds)); |
| } |
| |
| // Create binding group layout |
| Ref<BindGroupLayoutBase> bgl; |
| DAWN_TRY_ASSIGN( |
| bgl, utils::MakeBindGroupLayout( |
| device, |
| { |
| {0, wgpu::ShaderStage::Compute, kInternalStorageBufferBinding}, |
| {1, wgpu::ShaderStage::Compute, |
| wgpu::BufferBindingType::ReadOnlyStorage}, |
| {2, wgpu::ShaderStage::Compute, wgpu::BufferBindingType::Uniform}, |
| }, |
| /* allowInternalBinding */ true)); |
| |
| // Create pipeline layout |
| Ref<PipelineLayoutBase> layout; |
| DAWN_TRY_ASSIGN(layout, utils::MakeBasicPipelineLayout(device, bgl)); |
| |
| // Create ComputePipeline. |
| ComputePipelineDescriptor computePipelineDesc = {}; |
| // Generate the layout based on shader module. |
| computePipelineDesc.layout = layout.Get(); |
| computePipelineDesc.compute.module = store->timestampCS.Get(); |
| computePipelineDesc.compute.entryPoint = "main"; |
| |
| DAWN_TRY_ASSIGN(store->timestampComputePipeline, |
| device->CreateComputePipeline(&computePipelineDesc)); |
| } |
| |
| return store->timestampComputePipeline.Get(); |
| } |
| |
| } // anonymous namespace |
| |
| MaybeError EncodeConvertTimestampsToNanoseconds(CommandEncoder* encoder, |
| BufferBase* timestamps, |
| BufferBase* availability, |
| BufferBase* params) { |
| DeviceBase* device = encoder->GetDevice(); |
| |
| ComputePipelineBase* pipeline; |
| DAWN_TRY_ASSIGN(pipeline, GetOrCreateTimestampComputePipeline(device)); |
| |
| // Prepare bind group layout. |
| Ref<BindGroupLayoutBase> layout; |
| DAWN_TRY_ASSIGN(layout, pipeline->GetBindGroupLayout(0)); |
| |
| // Create bind group after all binding entries are set. |
| Ref<BindGroupBase> bindGroup; |
| DAWN_TRY_ASSIGN(bindGroup, |
| utils::MakeBindGroup(device, layout, |
| {{0, timestamps}, {1, availability}, {2, params}})); |
| |
| // Create compute encoder and issue dispatch. |
| ComputePassDescriptor passDesc = {}; |
| // TODO(dawn:723): change to not use AcquireRef for reentrant object creation. |
| Ref<ComputePassEncoder> pass = AcquireRef(encoder->APIBeginComputePass(&passDesc)); |
| pass->APISetPipeline(pipeline); |
| pass->APISetBindGroup(0, bindGroup.Get()); |
| pass->APIDispatch( |
| static_cast<uint32_t>((timestamps->GetSize() / sizeof(uint64_t) + 7) / 8)); |
| pass->APIEndPass(); |
| |
| return {}; |
| } |
| |
| } // namespace dawn_native |