SceneGraph demo

1 files changed, 66 insertions, 0 deletions

diff --git a/Swirl.qml b/Swirl.qml
new file mode 100644
index 0000000..e50de3a
--- /dev/null
+++ b/Swirl.qml
@@ -0,0 +1,66 @@
+   import QtQuick 2.0
+
+ShaderEffectItem {
+    id: shader
+
+    width: 400
+    height: 300
+
+    property real speed: 1
+
+    property color d: Qt.rgba(Math.random() * 0.7,
+                              Math.random() * 0.5,
+                              Math.random() * 0.7,
+                              Math.random() * 0.5)
+    property real tx
+    NumberAnimation on tx { from: 0; to: Math.PI * 2; duration: (Math.random() * 30 + 30) * 1000 / speed; loops: Animation.Infinite }
+    property real ty
+    NumberAnimation on ty { from: 0; to: Math.PI * 2; duration: (Math.random() * 30 + 30) * 1000 / speed; loops: Animation.Infinite }
+    property real tz
+    NumberAnimation on tz { from: 0; to: Math.PI * 2; duration: (Math.random() * 30 + 30) * 1000 / speed; loops: Animation.Infinite }
+    property real tw
+    NumberAnimation on tw { from: 0; to: Math.PI * 2; duration: (Math.random() * 30 + 30) * 1000 / speed; loops: Animation.Infinite }
+
+    property real amplitude: height / 2
+
+    property variant colorTable: ShaderEffectSource { sourceItem: Rectangle { width: 4; height: 4; color: "steelblue" } }
+
+    fragmentShader: "
+    uniform lowp float qt_Opacity;
+    uniform lowp sampler2D colorTable;
+    varying highp vec2 qt_TexCoord0;
+
+    void main() {
+        gl_FragColor = texture2D(colorTable, qt_TexCoord0);
+        gl_FragColor.w *= qt_Opacity;
+    }
+    "
+
+    vertexShader: "
+    uniform lowp vec4 d;
+    uniform highp float tx;
+    uniform highp float ty;
+    uniform highp float tz;
+    uniform highp float tw;
+    uniform highp float amplitude;
+    uniform highp mat4 qt_ModelViewProjectionMatrix;
+    attribute highp vec4 qt_Vertex;
+    attribute highp vec2 qt_MultiTexCoord0;
+    varying highp vec2 qt_TexCoord0;
+
+    void main() {
+        highp vec4 pos = qt_Vertex;
+
+        highp float y1 = sin(tx + d.x * qt_MultiTexCoord0.x * 17. + 2. * d.y) + sin(ty + d.z * qt_MultiTexCoord0.x * 11. + 5. * d.w);
+        highp float y2 = sin(tz + d.w * qt_MultiTexCoord0.x * 7. + 3. * d.z) + sin(tw + d.y * qt_MultiTexCoord0.x * 19. + 3. * d.x);
+
+        pos.y += mix(y1, y2, qt_MultiTexCoord0.y) * amplitude * 0.5;
+
+        gl_Position = qt_ModelViewProjectionMatrix * pos;
+        qt_TexCoord0 = qt_MultiTexCoord0;
+    }
+    "
+
+    mesh: GridMesh { resolution: Qt.size(width / 10, 4) }
+
+}