| Flutter Impeller |

gpu_tracer_gles.cc
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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 "impeller/renderer/backend/gles/gpu_tracer_gles.h"
6 #include <thread>
7 #include "fml/trace_event.h"
8
9 namespace impeller {
10
11 GPUTracerGLES::GPUTracerGLES(const ProcTableGLES& gl, bool enable_tracing) {
12 #ifdef IMPELLER_DEBUG
13 auto desc = gl.GetDescription();
14 enabled_ =
15 enable_tracing && desc->HasExtension("GL_EXT_disjoint_timer_query");
16 #endif // IMPELLER_DEBUG
17 }
18
19 void GPUTracerGLES::MarkFrameStart(const ProcTableGLES& gl) {
20 if (!enabled_ || active_frame_.has_value() ||
21 std::this_thread::get_id() != raster_thread_) {
22 return;
23 }
24
25 // At the beginning of a frame, check the status of all pending
26 // previous queries.
27 ProcessQueries(gl);
28
29 uint32_t query = 0;
30 gl.GenQueriesEXT(1, &query);
31 if (query == 0) {
32 return;
33 }
34
35 active_frame_ = query;
36 gl.BeginQueryEXT(GL_TIME_ELAPSED_EXT, query);
37 }
38
39 void GPUTracerGLES::RecordRasterThread() {
40 raster_thread_ = std::this_thread::get_id();
41 }
42
43 void GPUTracerGLES::ProcessQueries(const ProcTableGLES& gl) {
44 // For reasons unknown to me, querying the state of more than
45 // one query object per frame causes crashes on a Pixel 6 pro.
46 // It does not crash on an S10.
47 while (!pending_traces_.empty()) {
48 auto query = pending_traces_.front();
49
50 // First check if the query is complete without blocking
51 // on the result. Incomplete results are left in the pending
52 // trace vector and will not be checked again for another
53 // frame.
54 GLuint available = GL_FALSE;
55 gl.GetQueryObjectuivEXT(query, GL_QUERY_RESULT_AVAILABLE_EXT, &available);
56
57 if (available != GL_TRUE) {
58 // If a query is not available, then all subsequent queries will be
59 // unavailable.
60 return;
61 }
62 // Return the timer resolution in nanoseconds.
63 uint64_t duration = 0;
64 gl.GetQueryObjectui64vEXT(query, GL_QUERY_RESULT_EXT, &duration);
65 auto gpu_ms = duration / 1000000.0;
66
67 FML_TRACE_COUNTER("flutter", "GPUTracer",
68 reinterpret_cast<int64_t>(this), // Trace Counter ID
69 "FrameTimeMS", gpu_ms);
70 gl.DeleteQueriesEXT(1, &query);
71 pending_traces_.pop_front();
72 }
73 }
74
75 void GPUTracerGLES::MarkFrameEnd(const ProcTableGLES& gl) {
76 if (!enabled_ || std::this_thread::get_id() != raster_thread_ ||
77 !active_frame_.has_value()) {
78 return;
79 }
80
81 auto query = active_frame_.value();
82 gl.EndQueryEXT(GL_TIME_ELAPSED_EXT);
83
84 pending_traces_.push_back(query);
85 active_frame_ = std::nullopt;
86 }
87
88 } // namespace impeller
impeller::GPUTracerGLES::MarkFrameEnd
void MarkFrameEnd(const ProcTableGLES &gl)
Record the end of a frame workload.
Definition: gpu_tracer_gles.cc:75
impeller::GPUTracerGLES::MarkFrameStart
void MarkFrameStart(const ProcTableGLES &gl)
Record the start of a frame workload, if one hasn't already been started.
Definition: gpu_tracer_gles.cc:19
impeller::GPUTracerGLES::GPUTracerGLES
GPUTracerGLES(const ProcTableGLES &gl, bool enable_tracing)
Definition: gpu_tracer_gles.cc:11
impeller::GPUTracerGLES::RecordRasterThread
void RecordRasterThread()
Record the thread id of the raster thread.
Definition: gpu_tracer_gles.cc:39
impeller::ProcTableGLES
Definition: proc_table_gles.h:283
impeller::ProcTableGLES::GetDescription
const DescriptionGLES * GetDescription() const
Definition: proc_table_gles.cc:208
gpu_tracer_gles.h
impeller
Definition: allocation.cc:12