1
2 /*
3 * Copyright 2011 Google Inc.
4 *
5 * Use of this source code is governed by a BSD-style license that can be
6 * found in the LICENSE file.
7 */
8 #include "BenchGpuTimer_gl.h"
9 #include "gl/SkGLContextHelper.h"
10 #include "gl/GrGLUtil.h"
11
BenchGpuTimer(const SkGLContextHelper * glctx)12 BenchGpuTimer::BenchGpuTimer(const SkGLContextHelper* glctx) {
13 fContext = glctx;
14 glctx->ref();
15 glctx->makeCurrent();
16 fStarted = false;
17 fSupported = GrGLGetVersion(glctx->gl()) > GR_GL_VER(3,3) ||
18 glctx->hasExtension("GL_ARB_timer_query") ||
19 glctx->hasExtension("GL_EXT_timer_query");
20
21 if (fSupported) {
22 SK_GL(*glctx, GenQueries(1, &fQuery));
23 }
24 }
25
~BenchGpuTimer()26 BenchGpuTimer::~BenchGpuTimer() {
27 if (fSupported) {
28 fContext->makeCurrent();
29 SK_GL(*fContext, DeleteQueries(1, &fQuery));
30 }
31 fContext->unref();
32 }
33
startGpu()34 void BenchGpuTimer::startGpu() {
35 if (fSupported) {
36 fContext->makeCurrent();
37 fStarted = true;
38 SK_GL(*fContext, BeginQuery(GR_GL_TIME_ELAPSED, fQuery));
39 }
40 }
41
42 /**
43 * It is important to stop the cpu clocks first,
44 * as this will cpu wait for the gpu to finish.
45 */
endGpu()46 double BenchGpuTimer::endGpu() {
47 if (fSupported) {
48 fStarted = false;
49 fContext->makeCurrent();
50 SK_GL(*fContext, EndQuery(GR_GL_TIME_ELAPSED));
51
52 GrGLint available = 0;
53 while (!available) {
54 SK_GL_NOERRCHECK(*fContext, GetQueryObjectiv(fQuery,
55 GR_GL_QUERY_RESULT_AVAILABLE,
56 &available));
57 // If GetQueryObjectiv is erroring out we need some alternative
58 // means of breaking out of this loop
59 GrGLenum error;
60 SK_GL_RET_NOERRCHECK(*fContext, error, GetError());
61 if (GR_GL_NO_ERROR != error) {
62 break;
63 }
64 }
65 GrGLuint64 totalGPUTimeElapsed = 0;
66 SK_GL(*fContext, GetQueryObjectui64v(fQuery,
67 GR_GL_QUERY_RESULT,
68 &totalGPUTimeElapsed));
69
70 return totalGPUTimeElapsed / 1000000.0;
71 } else {
72 return 0;
73 }
74 }
75