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/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "GpuTimer.h"
#include "gl/SkGLContext.h"
#include "gl/GrGLUtil.h"
GpuTimer::GpuTimer(const SkGLContext* glctx) : fContext(glctx) {
if (fContext) {
fContext->ref();
fContext->makeCurrent();
fStarted = false;
fSupported = GrGLGetVersion(fContext->gl()) > GR_GL_VER(3,3) ||
fContext->hasExtension("GL_ARB_timer_query") ||
fContext->hasExtension("GL_EXT_timer_query");
if (fSupported) {
SK_GL(*fContext, GenQueries(1, &fQuery));
}
}
}
GpuTimer::~GpuTimer() {
if (fContext) {
if (fSupported) {
fContext->makeCurrent();
SK_GL(*fContext, DeleteQueries(1, &fQuery));
}
fContext->unref();
}
}
void GpuTimer::start() {
if (fContext && fSupported) {
fContext->makeCurrent();
fStarted = true;
SK_GL(*fContext, BeginQuery(GR_GL_TIME_ELAPSED, fQuery));
}
}
/**
* It is important to stop the cpu clocks first,
* as this will cpu wait for the gpu to finish.
*/
double GpuTimer::end() {
if (fContext && fSupported) {
fStarted = false;
fContext->makeCurrent();
SK_GL(*fContext, EndQuery(GR_GL_TIME_ELAPSED));
GrGLint available = 0;
while (!available) {
SK_GL_NOERRCHECK(*fContext, GetQueryObjectiv(fQuery,
GR_GL_QUERY_RESULT_AVAILABLE,
&available));
// If GetQueryObjectiv is erroring out we need some alternative
// means of breaking out of this loop
GrGLenum error;
SK_GL_RET_NOERRCHECK(*fContext, error, GetError());
if (GR_GL_NO_ERROR != error) {
break;
}
}
GrGLuint64 totalGPUTimeElapsed = 0;
SK_GL(*fContext, GetQueryObjectui64v(fQuery,
GR_GL_QUERY_RESULT,
&totalGPUTimeElapsed));
return totalGPUTimeElapsed / 1000000.0;
} else {
return 0;
}
}
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