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// Copyright 2015 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/modules/webgl/webgl_timer_query_ext.h"
#include "gpu/command_buffer/client/gles2_interface.h"
#include "third_party/blink/public/platform/platform.h"
#include "third_party/blink/public/platform/task_type.h"
#include "third_party/blink/renderer/modules/webgl/webgl_context_object_support.h"
#include "third_party/blink/renderer/platform/wtf/functional.h"
namespace blink {
WebGLTimerQueryEXT::WebGLTimerQueryEXT(WebGLContextObjectSupport* ctx)
: WebGLObject(ctx),
target_(0),
can_update_availability_(false),
query_result_available_(false),
query_result_(0),
task_runner_(ctx->GetContextTaskRunner()) {
if (!ctx || ctx->IsLost()) {
return;
}
GLuint query = 0;
ctx->ContextGL()->GenQueriesEXT(1, &query);
SetObject(query);
}
WebGLTimerQueryEXT::~WebGLTimerQueryEXT() = default;
void WebGLTimerQueryEXT::ResetCachedResult() {
can_update_availability_ = false;
query_result_available_ = false;
query_result_ = 0;
// When this is called, the implication is that we should start
// keeping track of whether we can update the cached availability
// and result.
ScheduleAllowAvailabilityUpdate();
}
void WebGLTimerQueryEXT::UpdateCachedResult(gpu::gles2::GLES2Interface* gl) {
// Context loss is checked at higher levels.
if (query_result_available_)
return;
if (!can_update_availability_)
return;
if (!HasTarget())
return;
// We can only update the cached result when control returns to the browser.
can_update_availability_ = false;
GLuint available = 0;
gl->GetQueryObjectuivEXT(Object(), GL_QUERY_RESULT_AVAILABLE_EXT, &available);
query_result_available_ = !!available;
if (query_result_available_) {
GLuint64 result = 0;
gl->GetQueryObjectui64vEXT(Object(), GL_QUERY_RESULT_EXT, &result);
query_result_ = result;
task_handle_.Cancel();
} else {
ScheduleAllowAvailabilityUpdate();
}
}
bool WebGLTimerQueryEXT::IsQueryResultAvailable() {
return query_result_available_;
}
GLuint64 WebGLTimerQueryEXT::GetQueryResult() {
return query_result_;
}
void WebGLTimerQueryEXT::DeleteObjectImpl(gpu::gles2::GLES2Interface* gl) {
gl->DeleteQueriesEXT(1, &Object());
}
void WebGLTimerQueryEXT::ScheduleAllowAvailabilityUpdate() {
if (task_handle_.IsActive())
return;
task_handle_ = PostCancellableTask(
*task_runner_, FROM_HERE,
WTF::BindOnce(&WebGLTimerQueryEXT::AllowAvailabilityUpdate,
WrapWeakPersistent(this)));
}
void WebGLTimerQueryEXT::AllowAvailabilityUpdate() {
can_update_availability_ = true;
}
} // namespace blink
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