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// Copyright 2015 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 "third_party/blink/renderer/modules/webgl/webgl_fence_sync.h"
#include <GLES2/gl2extchromium.h>
#include "gpu/command_buffer/client/gles2_interface.h"
#include "third_party/blink/renderer/modules/webgl/webgl2_rendering_context_base.h"
namespace blink {
WebGLSync* WebGLFenceSync::Create(WebGL2RenderingContextBase* ctx,
GLenum condition,
GLbitfield flags) {
DCHECK(condition == GL_SYNC_GPU_COMMANDS_COMPLETE);
DCHECK(flags == 0);
return new WebGLFenceSync(ctx, condition, flags);
}
WebGLFenceSync::WebGLFenceSync(WebGL2RenderingContextBase* ctx,
GLenum condition,
GLbitfield flags)
: WebGLSync(ctx, insertQuery(ctx), GL_SYNC_FENCE) {}
GLuint WebGLFenceSync::insertQuery(WebGL2RenderingContextBase* ctx) {
auto* gl = ctx->ContextGL();
GLuint query = 0;
gl->GenQueriesEXT(1, &query);
gl->BeginQueryEXT(GL_READBACK_SHADOW_COPIES_UPDATED_CHROMIUM, query);
// This query is used like a fence. There doesn't need to be anything inside.
gl->EndQueryEXT(GL_READBACK_SHADOW_COPIES_UPDATED_CHROMIUM);
return query;
}
} // namespace blink
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