D3D12: Add support for layers

Recursive and multisample support is left as a future exercise. Mipmapping
is not supported and is not planned for the time being.

Layers cannot currently be rendered on their own, although they have their
own independent render targets. Starting a layer just starts the next frame early,
putting all commands to the normal command list of that frame. Thus this is
not yet fully suitable for implementing grabs.

Buffer handling is revised to support multiple vertex, index or constant
buffers. This is essential since we are going to have multiple renderer
instances (and may also be needed for a more complex batching renderer
in the future)

QSGBasicImageNode::preprocess is changed not to regenerate the geometry on
every dynamic texture change. In most cases only the material needs to be
dirtied. Rebuilding the geometry is only necessary when the normalized
subrect or similar changes.

Change-Id: Id088c15d1b75022b54c1f8bff1656d2cd68fa7cc
Reviewed-by: Andy Nichols <andy.nichols@theqtcompany.com>

5 files changed, 112 insertions, 1 deletions

diff --git a/tests/manual/nodetypes/Layers.qml b/tests/manual/nodetypes/Layers.qml
new file mode 100644
index 0000000000..52c8fa8144
--- /dev/null
+++ b/tests/manual/nodetypes/Layers.qml
@@ -0,0 +1,106 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the demonstration applications of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** 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."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+import QtQuick 2.0
+
+Item {
+    Rectangle {
+        color: "lightGray"
+        anchors.fill: parent
+        anchors.margins: 10
+
+        Row {
+            anchors.fill: parent
+            anchors.margins: 10
+            Rectangle {
+                color: "red"
+//                ColorAnimation on color {
+//                    from: "black"
+//                    to: "white"
+//                    duration: 2000
+//                    loops: Animation.Infinite
+//                }
+                width: 300
+                height: 100
+                layer.enabled: true
+                Text { text: "this is in a layer, going through an offscreen render target" }
+                clip: true
+                Rectangle {
+                    color: "lightGreen"
+                    width: 50
+                    height: 50
+                    x: 275
+                    y: 75
+                }
+            }
+            Rectangle {
+                color: "white"
+                width: 300
+                height: 100
+                Text { text: "this is not a layer" }
+            }
+            Rectangle {
+                color: "green"
+                width: 300
+                height: 100
+                layer.enabled: true
+                Text { text: "this is another layer" }
+                Rectangle {
+                    border.width: 4
+                    border.color: "black"
+                    anchors.centerIn: parent
+                    width: 150
+                    height: 50
+                    layer.enabled: true
+                    Text {
+                        anchors.centerIn: parent
+                        text: "layer in a layer"
+                    }
+                }
+                Image {
+                    source: "qrc:/face-smile.png"
+                    anchors.bottom: parent.bottom
+                    anchors.right: parent.right
+                    NumberAnimation on rotation { from: 0; to: 360; duration: 2000; loops: Animation.Infinite; }
+                }
+            }
+        }
+    }
+}
diff --git a/tests/manual/nodetypes/main.qml b/tests/manual/nodetypes/main.qml
index b083bcc648..fe75e2d948 100644
--- a/tests/manual/nodetypes/main.qml
+++ b/tests/manual/nodetypes/main.qml
@@ -65,5 +65,8 @@ Item {
 
         if (event.key === Qt.Key_A)
             loader.source = "qrc:/Animators.qml";
+
+        if (event.key === Qt.Key_L)
+            loader.source = "qrc:/Layers.qml";
     }
 }
diff --git a/tests/manual/nodetypes/nodetypes.cpp b/tests/manual/nodetypes/nodetypes.cpp
index 3e82fc7d04..aaa641f300 100644
--- a/tests/manual/nodetypes/nodetypes.cpp
+++ b/tests/manual/nodetypes/nodetypes.cpp
@@ -66,6 +66,7 @@ int main(int argc, char **argv)
     qDebug("  [I] - Images");
     qDebug("  [T] - Text");
     qDebug("  [A] - Render thread Animator");
+    qDebug("  [L] - Layers");
     qDebug("\nPress S to stop the currently running test\n");
 
     Helper helper;
diff --git a/tests/manual/nodetypes/nodetypes.pro b/tests/manual/nodetypes/nodetypes.pro
index 713c48064f..a1633dcf22 100644
--- a/tests/manual/nodetypes/nodetypes.pro
+++ b/tests/manual/nodetypes/nodetypes.pro
@@ -4,4 +4,4 @@ SOURCES += nodetypes.cpp
 
 RESOURCES += nodetypes.qrc
 
-OTHER_FILES += main.qml Rects.qml LotsOfRects.qml Images.qml Text.qml Animators.qml
+OTHER_FILES += main.qml Rects.qml LotsOfRects.qml Images.qml Text.qml Animators.qml Layers.qml
diff --git a/tests/manual/nodetypes/nodetypes.qrc b/tests/manual/nodetypes/nodetypes.qrc
index 2f1f2a2bbc..b10fceef24 100644
--- a/tests/manual/nodetypes/nodetypes.qrc
+++ b/tests/manual/nodetypes/nodetypes.qrc
@@ -6,6 +6,7 @@
         <file>Images.qml</file>
         <file>Text.qml</file>
         <file>Animators.qml</file>
+        <file>Layers.qml</file>
         <file>qt.png</file>
         <file>face-smile.png</file>
         <file>shadow.png</file>