Implement camera and lights perspective mode

Add visual representation for camera and lights.
Add camera and light picking using billboards.

Task-number: QT3DS-375
Task-number: QT3DS-376
Task-number: QT3DS-383
Change-Id: I36548a993aeeb44421a71d56248539687f2f3a68
Reviewed-by: Mahmoud Badri <mahmoud.badri@qt.io>
Reviewed-by: Miikka Heikkinen <miikka.heikkinen@qt.io>
Reviewed-by: Tomi Korpipää <tomi.korpipaa@qt.io>

1 files changed, 107 insertions, 0 deletions

diff --git a/src/Authoring/Studio/Render/StudioVisualAidWidget.h b/src/Authoring/Studio/Render/StudioVisualAidWidget.h
new file mode 100644
index 00000000..8a91fa9c
--- /dev/null
+++ b/src/Authoring/Studio/Render/StudioVisualAidWidget.h
@@ -0,0 +1,107 @@
+/****************************************************************************
+**
+** 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 QT3DS_STUDIO_VISUAL_AID_WIDGET_H
+#define QT3DS_STUDIO_VISUAL_AID_WIDGET_H
+
+#include "StudioWidget.h"
+#include "foundation/Qt3DSContainers.h"
+#include "render/Qt3DSRenderShaderProgram.h"
+
+#include "Qt3DSRenderNode.h"
+#include "Qt3DSRenderShaderCodeGeneratorV2.h"
+
+
+namespace qt3ds {
+namespace widgets {
+
+struct SVisualAidWidget
+{
+    SNode *m_node;
+    NVScopedRefCounted<NVRenderInputAssembler> m_billboard;
+    NVScopedRefCounted<NVRenderInputAssembler> m_cameraBox;
+    NVScopedRefCounted<NVRenderInputAssembler> m_directionalLight;
+    NVScopedRefCounted<NVRenderInputAssembler> m_pointLight;
+    NVScopedRefCounted<NVRenderInputAssembler> m_areaLight;
+    NVScopedRefCounted<NVRenderShaderProgram> m_renderCameraShader;
+    NVScopedRefCounted<NVRenderShaderProgram> m_renderShader;
+    NVScopedRefCounted<NVRenderShaderProgram> m_billboardShader;
+    NVScopedRefCounted<NVRenderTexture2D> m_billboardCameraTexture;
+    NVScopedRefCounted<NVRenderTexture2D> m_billboardLightTexture;
+
+    bool m_selected;
+    NVAllocatorCallback &m_allocator;
+    volatile QT3DSI32 mRefCount;
+
+    SVisualAidWidget(NVAllocatorCallback &inAlloc);
+
+    QT3DS_IMPLEMENT_REF_COUNT_ADDREF_RELEASE(m_allocator)
+
+    NVConstDataRef<NVRenderVertexBufferEntry> getCameraBoxAttributesAndStride(QT3DSU32 &stride);
+    NVConstDataRef<NVRenderVertexBufferEntry> getLightAttributesAndStride(QT3DSU32 &stride);
+    NVConstDataRef<NVRenderVertexBufferEntry> getBillboardAttributesAndStride(QT3DSU32 &stride);
+    void renderCamera(SNode *node, IRenderWidgetContext &inWidgetContext,
+                      NVRenderContext &inRenderContext);
+    void renderLight(SNode *node, IRenderWidgetContext &inWidgetContext,
+                     NVRenderContext &inRenderContext);
+    void renderBillboard(SNode *node, IRenderWidgetContext &inWidgetContext,
+                         NVRenderContext &inRenderContext);
+    void SetNode(SNode *inNode);
+    NVRenderShaderProgram *createRenderShader(IRenderWidgetContext &inWidgetContext,
+                                              NVRenderContext &inRenderContext);
+    NVRenderShaderProgram *createBillboardShader(IRenderWidgetContext &inWidgetContext,
+                                                 NVRenderContext &inRenderContext);
+    NVRenderShaderProgram *createRenderCameraShader(IRenderWidgetContext &inWidgetContext,
+                                                    NVRenderContext &inRenderContext);
+    NVRenderInputAssembler *createCameraBox(IRenderWidgetContext &inWidgetContext,
+                                            NVRenderContext &inRenderContext);
+    NVRenderInputAssembler *createBillboard(IRenderWidgetContext &inWidgetContext,
+                                            NVRenderContext &inRenderContext);
+    NVRenderInputAssembler *createDirectionalLight(IRenderWidgetContext &inWidgetContext,
+                                                   NVRenderContext &inRenderContext);
+    NVRenderInputAssembler *createPointLight(IRenderWidgetContext &inWidgetContext,
+                                             NVRenderContext &inRenderContext);
+    NVRenderInputAssembler *createAreaLight(IRenderWidgetContext &inWidgetContext,
+                                            NVRenderContext &inRenderContext);
+    void Render(IRenderWidgetContext &inWidgetContext, NVRenderContext &inRenderContext);
+
+    bool pick(IRenderWidgetContext &inWidgetContext, float &dist,
+              QT3DSVec2 viewport, QT3DSVec2 pos);
+
+    void setSelected(bool selected)
+    {
+        m_selected = selected;
+    }
+
+    static SVisualAidWidget &CreateVisualAidWidget(NVAllocatorCallback &inAlloc);
+};
+
+}
+}
+
+
+#endif // QT3DS_STUDIO_VISUAL_AID_WIDGET_H