Implement EXT_disjoint_timer_query_webgl2

third_party/WebKit/Source/modules/webgl/EXTDisjointTimerQueryWebGL2.cpp

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "modules/webgl/EXTDisjointTimerQueryWebGL2.h"
+
+#include "bindings/modules/v8/WebGLAny.h"
+#include "gpu/command_buffer/client/gles2_interface.h"
+#include "modules/webgl/WebGLRenderingContextBase.h"
+
+namespace blink {
+
+EXTDisjointTimerQueryWebGL2::~EXTDisjointTimerQueryWebGL2() {}
+
+WebGLExtensionName EXTDisjointTimerQueryWebGL2::name() const {
+  return EXTDisjointTimerQueryWebGL2Name;
+}
+
+EXTDisjointTimerQueryWebGL2* EXTDisjointTimerQueryWebGL2::create(
+    WebGLRenderingContextBase* context) {
+  EXTDisjointTimerQueryWebGL2* o = new EXTDisjointTimerQueryWebGL2(context);
+  return o;
+}
+
+bool EXTDisjointTimerQueryWebGL2::supported(
+    WebGLRenderingContextBase* context) {
+  return context->extensionsUtil()->supportsExtension(
+      "GL_EXT_disjoint_timer_query");
+}
+
+const char* EXTDisjointTimerQueryWebGL2::extensionName() {
+  return "EXT_disjoint_timer_query_webgl2";
+}
+
+void EXTDisjointTimerQueryWebGL2::queryCounterEXT(WebGLQuery* query,
+                                                  GLenum target) {
+  WebGLExtensionScopedContext scoped(this);
+  if (scoped.isLost())
+    return;
+
+  if (!query || query->isDeleted() ||
+      !query->validate(scoped.context()->contextGroup(), scoped.context())) {
+    scoped.context()->synthesizeGLError(GL_INVALID_OPERATION, "queryCounterEXT",
+                                        "invalid query");
+    return;
+  }
+
+  if (target != GL_TIMESTAMP_EXT) {
+    scoped.context()->synthesizeGLError(GL_INVALID_ENUM, "queryCounterEXT",
+                                        "invalid target");
+    return;
+  }
+
+  if (query->hasTarget() && query->getTarget() != target) {
+    scoped.context()->synthesizeGLError(GL_INVALID_OPERATION, "queryCounterEXT",
+                                        "target does not match query");
+    return;
+  }
+
+  // Timestamps are disabled in WebGL due to lack of driver support on multiple
+  // platforms, so we don't actually perform a GL call.
+  query->setTarget(target);
+  query->resetCachedResult();
+}
+
+DEFINE_TRACE(EXTDisjointTimerQueryWebGL2) {
+  WebGLExtension::trace(visitor);
+}
+
+EXTDisjointTimerQueryWebGL2::EXTDisjointTimerQueryWebGL2(
+    WebGLRenderingContextBase* context)
+    : WebGLExtension(context) {
+  context->extensionsUtil()->ensureExtensionEnabled(
+      "GL_EXT_disjoint_timer_query_webgl2");
+}
+
+}  // namespace blink