Implement gradient background

Gradient background is drawn always in other modes than scene view.
The gradient is never drawn on scene view.

Task-number: QT3DS-375
Change-Id: I41b32a0997e5620e9498b2090899912e9a2e0cc9
Reviewed-by: Tomi Korpipää <tomi.korpipaa@qt.io>
Reviewed-by: Miikka Heikkinen <miikka.heikkinen@qt.io>

1 files changed, 89 insertions, 0 deletions

diff --git a/src/Authoring/Studio/Render/StudioGradientWidget.h b/src/Authoring/Studio/Render/StudioGradientWidget.h
new file mode 100644
index 00000000..f2ad30f2
--- /dev/null
+++ b/src/Authoring/Studio/Render/StudioGradientWidget.h
@@ -0,0 +1,89 @@
+/****************************************************************************
+**
+** Copyright (C) 2018 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of Qt 3D Studio.
+**
+** $QT_BEGIN_LICENSE:GPL-EXCEPT$
+** 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.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef STUDIO_GRADIENT_WIDGET_H
+#define STUDIO_GRADIENT_WIDGET_H
+
+#include "stdafx.h"
+#include "StudioWidgetImpl.h"
+#include "foundation/Qt3DSAtomic.h"
+#include "render/Qt3DSRenderContext.h"
+#include "render/Qt3DSRenderVertexBuffer.h"
+#include "Qt3DSRenderNode.h"
+#include "foundation/Qt3DSContainers.h"
+#include "Qt3DSRenderShaderCodeGenerator.h"
+#include "render/Qt3DSRenderShaderProgram.h"
+#include "StudioUtils.h"
+
+namespace qt3ds {
+namespace widgets {
+
+class SGradientWidget
+{
+    NVAllocatorCallback &m_allocator;
+    NVRenderInputAssembler *m_sphere;
+    NVRenderShaderProgram *m_shader;
+    SNode *m_node;
+
+    volatile QT3DSI32 mRefCount;
+
+public:
+    SGradientWidget(NVAllocatorCallback &inAlloc)
+        : m_allocator(inAlloc)
+        , m_sphere(nullptr)
+        , m_shader(nullptr)
+        , mRefCount(0)
+    {
+    }
+
+    QT3DS_IMPLEMENT_REF_COUNT_ADDREF_RELEASE(m_allocator)
+
+    NVConstDataRef<qt3ds::render::NVRenderVertexBufferEntry>
+    GetVertexBufferAttributesAndStride(QT3DSU32 &stride);
+    NVRenderInputAssembler *CreateSphere(IRenderWidgetContext &inWidgetContext,
+                                         NVRenderContext &inRenderContext,
+                                         QT3DSF32 radius);
+
+    NVRenderShaderProgram *CreateGradientShader(IRenderWidgetContext &inWidgetContext,
+                                                NVRenderContext &inRenderContext);
+
+    void Render(IRenderWidgetContext &inWidgetContext, NVRenderContext &inRenderContext,
+                bool fullScreenQuad);
+
+    void SetNode(SNode &inNode)
+    {
+        m_node = &inNode;
+    }
+
+    static SGradientWidget &CreateGradientWidget(NVAllocatorCallback &inAlloc);
+};
+
+}
+}
+
+#endif // STUDIO_GRADIENT_WIDGET_H