bigscene-instanced-qml example demonstrating instancing

Change-Id: Ie556d85a837ebefbf1d6e053f7985bf791ffdcfb
Reviewed-by: Sean Harmer <sean.harmer@kdab.com>

7 files changed, 298 insertions, 1 deletions

diff --git a/examples/qt3d/bigscene-instanced-qml/bigscene-instanced-qml.pro b/examples/qt3d/bigscene-instanced-qml/bigscene-instanced-qml.pro
new file mode 100644
index 000000000..b08e85654
--- /dev/null
+++ b/examples/qt3d/bigscene-instanced-qml/bigscene-instanced-qml.pro
@@ -0,0 +1,12 @@
+!include( ../examples.pri ) {
+    error( "Couldn't find the examples.pri file!" )
+}
+
+QT += qml quick 3dcore 3drenderer 3dinput 3dquick
+
+SOURCES += \
+    main.cpp
+
+
+RESOURCES += \
+    bigscene-instanced-qml.qrc
diff --git a/examples/qt3d/bigscene-instanced-qml/bigscene-instanced-qml.qrc b/examples/qt3d/bigscene-instanced-qml/bigscene-instanced-qml.qrc
new file mode 100644
index 000000000..3e4910f7a
--- /dev/null
+++ b/examples/qt3d/bigscene-instanced-qml/bigscene-instanced-qml.qrc
@@ -0,0 +1,7 @@
+<RCC>
+    <qresource prefix="/">
+        <file>main.qml</file>
+        <file>instanced.frag</file>
+        <file>instanced.vert</file>
+    </qresource>
+</RCC>
diff --git a/examples/qt3d/bigscene-instanced-qml/instanced.frag b/examples/qt3d/bigscene-instanced-qml/instanced.frag
new file mode 100644
index 000000000..0efd52b32
--- /dev/null
+++ b/examples/qt3d/bigscene-instanced-qml/instanced.frag
@@ -0,0 +1,43 @@
+#version 150 core
+
+uniform vec4 lightPosition = vec4(1.0, 1.0, 0.0, 1.0);
+uniform vec3 lightIntensity = vec3(1.0, 1.0, 1.0);
+
+uniform vec3 ka;            // Ambient reflectivity
+uniform vec3 ks = vec3(1.0, 1.0, 1.0);            // Specular reflectivity
+uniform float shininess = 150.0;    // Specular shininess factor
+
+in vec3 kd;            // Diffuse reflectivity
+in vec3 position;
+in vec3 normal;
+
+out vec4 fragColor;
+
+vec3 adsModel( const in vec3 pos, const in vec3 n )
+{
+    // Calculate the vector from the light to the fragment
+    vec3 s = normalize( vec3( lightPosition ) - pos );
+
+    // Calculate the vector from the fragment to the eye position
+    // (origin since this is in "eye" or "camera" space)
+    vec3 v = normalize( -pos );
+
+    // Reflect the light beam using the normal at this fragment
+    vec3 r = reflect( -s, n );
+
+    // Calculate the diffuse component
+    float diffuse = max( dot( s, n ), 0.0 );
+
+    // Calculate the specular component
+    float specular = 0.0;
+    if ( dot( s, n ) > 0.0 )
+        specular = pow( max( dot( r, v ), 0.0 ), shininess );
+
+    // Combine the ambient, diffuse and specular contributions
+    return lightIntensity * ( ka + kd * diffuse + ks * specular );
+}
+
+void main()
+{
+    fragColor = vec4( adsModel( position, normalize( normal ) ), 1.0 );
+}
diff --git a/examples/qt3d/bigscene-instanced-qml/instanced.vert b/examples/qt3d/bigscene-instanced-qml/instanced.vert
new file mode 100644
index 000000000..f713957e3
--- /dev/null
+++ b/examples/qt3d/bigscene-instanced-qml/instanced.vert
@@ -0,0 +1,66 @@
+#version 150 core
+
+#define M_PI 3.14159
+
+in vec3 vertexPosition;
+in vec3 vertexNormal;
+
+out vec3 position;
+out vec3 normal;
+out vec3 kd;
+
+uniform mat4 viewMatrix;
+uniform mat4 projectionMatrix;
+uniform mat3 modelViewNormal;
+uniform int instanceCount;
+
+uniform float time;
+
+const vec3 ZAXIS = vec3(0.0, 0.0, 1.0);
+const vec3 XAXIS = vec3(1.0, 0.0, 0.0);
+const float radius = 30.0;
+float det = 1.0 / float(instanceCount);
+
+mat4 rotationMatrix(vec3 axis, float angle)
+{
+    axis = normalize(axis);
+    float s = sin(angle);
+    float c = cos(angle);
+    float oc = 1.0 - c;
+
+    return mat4(oc * axis.x * axis.x + c,           oc * axis.x * axis.y - axis.z * s,  oc * axis.z * axis.x + axis.y * s,  0.0,
+                oc * axis.x * axis.y + axis.z * s,  oc * axis.y * axis.y + c,           oc * axis.y * axis.z - axis.x * s,  0.0,
+                oc * axis.z * axis.x - axis.y * s,  oc * axis.y * axis.z + axis.x * s,  oc * axis.z * axis.z + c,           0.0,
+                0.0,                                0.0,                                0.0,                                1.0);
+}
+
+
+mat4 translationMatrix(vec3 translation)
+{
+    return mat4(1.0, 0.0, 0.0, 0.0,
+                0.0, 1.0, 0.0, 0.0,
+                0.0, 0.0, 1.0, 0.0,
+                translation.x, translation.y, translation.z, 0);
+
+}
+
+void main()
+{
+    float angle = M_PI * 2.0f * gl_InstanceID * det * 10.0 * time * 0.05;
+    vec3 translation = vec3(radius * cos(angle), 200.0 * gl_InstanceID * det, radius * sin(angle));
+
+    mat4 modelMatrix = translationMatrix(translation) *
+                       rotationMatrix(ZAXIS, radians(angle * 45.0)) *
+                       rotationMatrix(XAXIS, radians(angle * 30.0));
+
+    vec4 eyePosition = viewMatrix *
+                       modelMatrix *
+                       vec4(vertexPosition, 1.0);
+
+    position = eyePosition.xyz;
+    kd = vec3(abs(cos(angle)), 0.75, 25);
+    normal = normalize(mat3(modelMatrix) * modelViewNormal *
+                       vertexNormal);
+
+    gl_Position = projectionMatrix * vec4(position, 1.0);
+}
diff --git a/examples/qt3d/bigscene-instanced-qml/main.cpp b/examples/qt3d/bigscene-instanced-qml/main.cpp
new file mode 100644
index 000000000..45385a76c
--- /dev/null
+++ b/examples/qt3d/bigscene-instanced-qml/main.cpp
@@ -0,0 +1,63 @@
+/****************************************************************************
+**
+** Copyright (C) 2014 Klaralvdalens Datakonsult AB (KDAB).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the Qt3D module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL3$
+** 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 http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPLv3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or later as published by the Free
+** Software Foundation and appearing in the file LICENSE.GPL included in
+** the packaging of this file. Please review the following information to
+** ensure the GNU General Public License version 2.0 requirements will be
+** met: http://www.gnu.org/licenses/gpl-2.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <window.h>
+#include <Qt3DRenderer/qrenderaspect.h>
+#include <Qt3DInput/QInputAspect>
+#include <Qt3DQuick/QQmlAspectEngine>
+
+#include <QGuiApplication>
+
+int main(int argc, char* argv[])
+{
+    QGuiApplication app(argc, argv);
+
+    Window view;
+    Qt3D::Quick::QQmlAspectEngine engine;
+
+    engine.aspectEngine()->registerAspect(new Qt3D::QRenderAspect());
+    engine.aspectEngine()->registerAspect(new Qt3D::QInputAspect());
+    engine.aspectEngine()->initialize();
+    QVariantMap data;
+    data.insert(QStringLiteral("surface"), QVariant::fromValue(static_cast<QSurface *>(&view)));
+    data.insert(QStringLiteral("eventSource"), QVariant::fromValue(&view));
+    engine.aspectEngine()->setData(data);
+    engine.setSource(QUrl("qrc:/main.qml"));
+
+    view.show();
+
+    return app.exec();
+}
diff --git a/examples/qt3d/bigscene-instanced-qml/main.qml b/examples/qt3d/bigscene-instanced-qml/main.qml
new file mode 100644
index 000000000..9d5cc596e
--- /dev/null
+++ b/examples/qt3d/bigscene-instanced-qml/main.qml
@@ -0,0 +1,105 @@
+/****************************************************************************
+**
+** Copyright (C) 2014 Klaralvdalens Datakonsult AB (KDAB).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the Qt3D module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL3$
+** 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 http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPLv3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or later as published by the Free
+** Software Foundation and appearing in the file LICENSE.GPL included in
+** the packaging of this file. Please review the following information to
+** ensure the GNU General Public License version 2.0 requirements will be
+** met: http://www.gnu.org/licenses/gpl-2.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+import Qt3D 2.0
+import Qt3D.Renderer 2.0
+import QtQuick 2.2 as QQ2
+
+Entity {
+    id: sceneRoot
+
+    Camera {
+        id: camera
+        projectionType: CameraLens.PerspectiveProjection
+        fieldOfView: 45
+        aspectRatio: 16/9
+        nearPlane : 0.1
+        farPlane : 1000.0
+        position: Qt.vector3d(0.0, -250.0, -50.0)
+        upVector: Qt.vector3d(0.0, 1.0, 0.0)
+        viewCenter: Qt.vector3d(0.0, 0.0, 0.0)
+    }
+
+    Configuration  {
+        controlledCamera: camera
+    }
+
+    components: [
+        FrameGraph {
+            activeFrameGraph: ForwardRenderer {
+                clearColor: Qt.rgba(0, 0.5, 1, 1)
+                camera: camera
+            }
+        }
+    ]
+
+    property real timeValue: 5
+
+    Material {
+        id: instancedPhongMaterial
+        effect: Effect {
+            techniques: Technique {
+                openGLFilter {
+                    api: OpenGLFilter.Desktop
+                    profile: OpenGLFilter.Core
+                    minorVersion: 2
+                    majorVersion: 3
+                }
+                renderPasses: RenderPass {
+                    shaderProgram: ShaderProgram {
+                        vertexShaderCode: loadSource("qrc:/instanced.vert")
+                        fragmentShaderCode: loadSource("qrc:/instanced.frag")
+                    }
+                }
+            }
+        }
+        parameters: Parameter { name: "instanceCount"; value: cylinderMeshInstanced.instanceCount }
+    }
+
+    CylinderMesh {
+        id: cylinderMeshInstanced
+        instanceCount: 2000
+        rings: 50
+        slices: 30
+        radius: 2.5
+        length: 5.0
+    }
+
+    Entity {
+        id: torusEntity
+        components: [ cylinderMeshInstanced, instancedPhongMaterial ]
+    }
+}
diff --git a/examples/qt3d/qt3d.pro b/examples/qt3d/qt3d.pro
index 856836e86..d3e40cad9 100644
--- a/examples/qt3d/qt3d.pro
+++ b/examples/qt3d/qt3d.pro
@@ -38,7 +38,8 @@ SUBDIRS += \
     scene3d-loader \
     clip-planes-qml \
     mouseinput-qml \
-    custom-mesh-cpp
+    custom-mesh-cpp \
+    bigscene-instanced-qml
 
 # TODO Port the old examples to new APIs
 #SUBDIRS += qt3d