6177e6999d
https://codereview.appspot.com/7436045/ git-svn-id: http://skia.googlecode.com/svn/trunk@7905 2bbb7eff-a529-9590-31e7-b0007b416f81
75 lines
2.1 KiB
C++
75 lines
2.1 KiB
C++
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/*
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* Copyright 2011 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "BenchGpuTimer_gl.h"
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#include "gl/SkGLContextHelper.h"
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#include "gl/GrGLUtil.h"
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BenchGpuTimer::BenchGpuTimer(const SkGLContextHelper* glctx) {
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fContext = glctx;
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glctx->ref();
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glctx->makeCurrent();
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fStarted = false;
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fSupported = GrGLGetVersion(glctx->gl()) > GR_GL_VER(3,3) ||
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glctx->hasExtension("GL_ARB_timer_query") ||
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glctx->hasExtension("GL_EXT_timer_query");
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if (fSupported) {
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SK_GL(*glctx, GenQueries(1, &fQuery));
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}
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}
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BenchGpuTimer::~BenchGpuTimer() {
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if (fSupported) {
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fContext->makeCurrent();
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SK_GL(*fContext, DeleteQueries(1, &fQuery));
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}
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fContext->unref();
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}
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void BenchGpuTimer::startGpu() {
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if (fSupported) {
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fContext->makeCurrent();
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fStarted = true;
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SK_GL(*fContext, BeginQuery(GR_GL_TIME_ELAPSED, fQuery));
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}
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}
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/**
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* It is important to stop the cpu clocks first,
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* as this will cpu wait for the gpu to finish.
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*/
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double BenchGpuTimer::endGpu() {
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if (fSupported) {
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fStarted = false;
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fContext->makeCurrent();
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SK_GL(*fContext, EndQuery(GR_GL_TIME_ELAPSED));
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GrGLint available = 0;
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while (!available) {
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SK_GL_NOERRCHECK(*fContext, GetQueryObjectiv(fQuery,
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GR_GL_QUERY_RESULT_AVAILABLE,
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&available));
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// If GetQueryObjectiv is erroring out we need some alternative
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// means of breaking out of this loop
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GrGLenum error;
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SK_GL_RET_NOERRCHECK(*fContext, error, GetError());
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if (GR_GL_NO_ERROR != error) {
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break;
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}
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}
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GrGLuint64 totalGPUTimeElapsed = 0;
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SK_GL(*fContext, GetQueryObjectui64v(fQuery,
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GR_GL_QUERY_RESULT,
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&totalGPUTimeElapsed));
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return totalGPUTimeElapsed / 1000000.0;
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} else {
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return 0;
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}
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}
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