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Unified Diff: tools/timer/GpuTimer.cpp

Issue 1422623003: Revert of SkTime::GetNSecs() (Closed) Base URL: https://skia.googlesource.com/skia.git@master
Patch Set: Created 5 years, 2 months ago
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Index: tools/timer/GpuTimer.cpp
diff --git a/tools/timer/GpuTimer.cpp b/tools/timer/GpuTimer.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..51ab3ad2359ba436bfab33e04cec941601f0f7c0
--- /dev/null
+++ b/tools/timer/GpuTimer.cpp
@@ -0,0 +1,77 @@
+
+/*
+ * 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->gl()->hasExtension("GL_ARB_timer_query") ||
+ fContext->gl()->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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