diff options
Diffstat (limited to 'tools/timer/GpuTimer.cpp')
-rw-r--r-- | tools/timer/GpuTimer.cpp | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/tools/timer/GpuTimer.cpp b/tools/timer/GpuTimer.cpp new file mode 100644 index 0000000000..3174449f78 --- /dev/null +++ b/tools/timer/GpuTimer.cpp @@ -0,0 +1,74 @@ + +/* + * 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/SkGLContextHelper.h" +#include "gl/GrGLUtil.h" + +GpuTimer::GpuTimer(const SkGLContextHelper* glctx) { + fContext = glctx; + glctx->ref(); + glctx->makeCurrent(); + fStarted = false; + fSupported = GrGLGetVersion(glctx->gl()) > GR_GL_VER(3,3) || + glctx->hasExtension("GL_ARB_timer_query") || + glctx->hasExtension("GL_EXT_timer_query"); + + if (fSupported) { + SK_GL(*glctx, GenQueries(1, &fQuery)); + } +} + +GpuTimer::~GpuTimer() { + if (fSupported) { + fContext->makeCurrent(); + SK_GL(*fContext, DeleteQueries(1, &fQuery)); + } + fContext->unref(); +} + +void GpuTimer::start() { + if (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 (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; + } +} |