Compositor: Implement linux-dmabuf-unstable-v1

[ChangeLog][Compositor] Added support for linux-dmabuf-unstable-v1.

Implement client side DMABUF buffer sharing support by supporting the
linux-dmabuf-unstable-v1 (version 3) protocol. For enabling DMABUF,
set the following environment variables for the compositor:

QT_QPA_PLATFORM=eglfs
QT_WAYLAND_CLIENT_BUFFER_INTEGRATION=linux-dmabuf-unstable-v1

The current implementation supports the following DRM buffer formats:
- RGB and RGBA
- YUYV

This implementation requires Mesa with the following patch applied.
Otherwise, textures are not updated. The patch is contained in Mesa 18.1.5.
See https://patchwork.freedesktop.org/patch/238080/

Fixes: QTBUG-66288
Fixes: QTBUG-67845
Change-Id: Id4d90337dbe0be956b0f964426ebed3f281c6c30
Reviewed-by: Johan Helsing <johan.helsing@qt.io>

2 files changed, 72 insertions, 0 deletions

diff --git a/config.tests/dmabuf_client_buffer/dmabuf_client_buffer.pro b/config.tests/dmabuf_client_buffer/dmabuf_client_buffer.pro
new file mode 100644
index 000000000..28dcadcbf
--- /dev/null
+++ b/config.tests/dmabuf_client_buffer/dmabuf_client_buffer.pro
@@ -0,0 +1 @@
+SOURCES += main.cpp
diff --git a/config.tests/dmabuf_client_buffer/main.cpp b/config.tests/dmabuf_client_buffer/main.cpp
new file mode 100644
index 000000000..71447dc8e
--- /dev/null
+++ b/config.tests/dmabuf_client_buffer/main.cpp
@@ -0,0 +1,71 @@
+/****************************************************************************
+**
+** Copyright (C) 2018 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the Qt Compositor.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** BSD License Usage
+** Alternatively, you may use this file under the terms of the BSD license
+** as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of The Qt Company Ltd nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <EGL/egl.h>
+#include <EGL/eglext.h>
+
+//If libdrm is available, the following files should exist
+#include "drm_mode.h"
+#include "drm_fourcc.h"
+
+int main()
+{
+// test if DMA BUF is supported
+#ifndef EGL_LINUX_DMA_BUF_EXT
+#error DMA BUF Extension not available
+#endif
+
+// test if DMA BUF import modifier extension is supported
+#ifndef EGL_EXT_image_dma_buf_import_modifiers
+#error DMA BUF Import modifier extension not available
+#endif
+
+    return 0;
+}