Flutter Impeller
gpu_tracer_mtl.mm
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1 // Copyright 2013 The Flutter Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4 
5 #include <Metal/Metal.h>
6 #include "fml/trace_event.h"
9 
10 #include <memory>
11 
13 
14 namespace impeller {
15 
17  if (@available(ios 10.3, tvos 10.2, macos 10.15, macCatalyst 13.0, *)) {
18  Lock lock(trace_state_mutex_);
19  current_state_ = (current_state_ + 1) % 16;
20  }
21 }
22 
23 void GPUTracerMTL::RecordCmdBuffer(id<MTLCommandBuffer> buffer) {
24  if (@available(ios 10.3, tvos 10.2, macos 10.15, macCatalyst 13.0, *)) {
25  Lock lock(trace_state_mutex_);
26  auto current_state = current_state_;
27  trace_states_[current_state].pending_buffers += 1;
28 
29  auto weak_self = weak_from_this();
30  [buffer addCompletedHandler:^(id<MTLCommandBuffer> buffer) {
31  auto self = weak_self.lock();
32  if (!self) {
33  return;
34  }
35  Lock lock(self->trace_state_mutex_);
36  auto& state = self->trace_states_[current_state];
37  state.pending_buffers--;
38  state.smallest_timestamp = std::min(
39  state.smallest_timestamp, static_cast<Scalar>(buffer.GPUStartTime));
40  state.largest_timestamp = std::max(
41  state.largest_timestamp, static_cast<Scalar>(buffer.GPUEndTime));
42 
43  if (state.pending_buffers == 0) {
44  auto gpu_ms =
45  (state.largest_timestamp - state.smallest_timestamp) * 1000;
46  state.smallest_timestamp = std::numeric_limits<float>::max();
47  state.largest_timestamp = 0;
48  FML_TRACE_COUNTER("flutter", "GPUTracer",
49  reinterpret_cast<int64_t>(this), // Trace Counter ID
50  "FrameTimeMS", gpu_ms);
51  }
52  }];
53  }
54 }
55 
56 } // namespace impeller
impeller::Scalar
float Scalar
Definition: scalar.h:18
context_mtl.h
impeller::GPUTracerMTL::MarkFrameEnd
void MarkFrameEnd()
Record that the current frame has ended. Any additional cmd buffers will be attributed to the "next" ...
Definition: gpu_tracer_mtl.mm:16
impeller::Lock
Definition: thread.h:75
formats_mtl.h
impeller::GPUTracerMTL::RecordCmdBuffer
void RecordCmdBuffer(id< MTLCommandBuffer > buffer)
Record the current cmd buffer GPU execution timestamps into an aggregate frame workload metric.
Definition: gpu_tracer_mtl.mm:23
gpu_tracer_mtl.h
impeller
Definition: aiks_blur_unittests.cc:20