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 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 26 BenchGpuTimer::~BenchGpuTimer() { 27 if (fSupported) { 28 fContext->makeCurrent(); 29 SK_GL(*fContext, DeleteQueries(1, &fQuery)); 30 } 31 fContext->unref(); 32 } 33 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 */ 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
