Update ShaderEffect docs

The two ShaderEffect related snippets are removed, with the relevant
code folded into the documentation itself. We cannot support standalone
snippets with custom shaders as we'd need to have separate shader files,
qsb files, scripts to build, etc. This is not reasonable at this point.

In layerblending.qml the ShaderEffect serves no purpose, apart from
providing a fancy background that is irrelevant to the topic. Just
remove that.

Change-Id: I726f029c8b7096938aa609031e391e9e57ef1655
Reviewed-by: Christian Strømme <christian.stromme@qt.io>

3 files changed, 0 insertions, 273 deletions

diff --git a/src/quick/doc/snippets/qml/layerblending.qml b/src/quick/doc/snippets/qml/layerblending.qml
index 71804d722a..ee97755dce 100644
--- a/src/quick/doc/snippets/qml/layerblending.qml
+++ b/src/quick/doc/snippets/qml/layerblending.qml
@@ -54,34 +54,6 @@ Item {
     width: 300
     height: 200
 
-    // The checkers background
-    ShaderEffect {
-        id: tileBackground
-        anchors.fill: parent
-
-        property real tileSize: 10
-        property color color1: Qt.rgba(0.9, 0.9, 0.9, 1);
-        property color color2: Qt.rgba(0.85, 0.85, 0.85, 1);
-
-        property size pixelSize: Qt.size(width / tileSize, height / tileSize);
-
-        fragmentShader:
-            "
-            uniform lowp vec4 color1;
-            uniform lowp vec4 color2;
-            uniform highp vec2 pixelSize;
-            varying highp vec2 qt_TexCoord0;
-            void main() {
-                highp vec2 tc = sign(sin(3.14159265358979323846 * qt_TexCoord0 * pixelSize));
-                if (tc.x != tc.y)
-                    gl_FragColor = color1;
-                else
-                    gl_FragColor = color2;
-            }
-            "
-    }
-
-
     Row {
         height: 100
         anchors.centerIn: parent
diff --git a/src/quick/doc/snippets/qml/layerwitheffect.qml b/src/quick/doc/snippets/qml/layerwitheffect.qml
deleted file mode 100644
index 880470b469..0000000000
--- a/src/quick/doc/snippets/qml/layerwitheffect.qml
+++ /dev/null
@@ -1,121 +0,0 @@
-/****************************************************************************
-**
-** Copyright (C) 2014 Gunnar Sletta <gunnar@sletta.org>
-** Contact: https://www.qt.io/licensing/
-**
-** This file is part of the documentation of the Qt Toolkit.
-**
-** $QT_BEGIN_LICENSE:BSD$
-** 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.
-**
-** BSD License Usage
-** Alternatively, 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 2.2
-
-Rectangle {
-    id: root
-    width: 320
-    height: 320
-
-    gradient: Gradient {
-        GradientStop { position: 0; color: "steelblue" }
-        GradientStop { position: 1; color: "black" }
-    }
-
-    property real cx: width / 2;
-    property real cy: height / 2;
-    property real boxSize: root.width * 0.2;
-    property real radius: width / 4;
-
-
-//! [1]
-Item {
-    id: layerRoot
-    layer.enabled: true
-    layer.effect: ShaderEffect {
-        fragmentShader: "
-            uniform lowp sampler2D source; // this item
-            uniform lowp float qt_Opacity; // inherited opacity of this item
-            varying highp vec2 qt_TexCoord0;
-            void main() {
-                lowp vec4 p = texture2D(source, qt_TexCoord0);
-                lowp float g = dot(p.xyz, vec3(0.344, 0.5, 0.156));
-                gl_FragColor = vec4(g, g, g, p.a) * qt_Opacity;
-            }"
-    }
-//! [1]
-
-        anchors.fill: parent
-
-
-        Repeater {
-            id: repeater
-            model: 200
-
-            Rectangle {
-                id: box
-
-                property real t: index / (repeater.model - 1);
-
-                width: 0
-                height: 0
-                x: root.cx - Math.sin(Math.PI * 2 * t) * root.radius;
-                y: root.cy - Math.cos(Math.PI * 2 * t) * root.radius;
-
-                Rectangle {
-                    width: root.boxSize
-                    height: root.boxSize
-                    anchors.centerIn: parent
-                    color: Qt.hsla(box.t, 0.5, 0.5);
-                    border.color: "white"
-                    antialiasing: true;
-                    rotation: box.t * 360;
-//                    RotationAnimator on rotation {
-//                        from: box.t * 360;
-//                        to: box.t * 360 + 360;
-//                        duration: 7592;
-//                        loops: Animation.Infinite
-//                    }
-                }
-            }
-        }
-    }
-}
diff --git a/src/quick/doc/snippets/qml/opacitymask.qml b/src/quick/doc/snippets/qml/opacitymask.qml
deleted file mode 100644
index f58180b6d2..0000000000
--- a/src/quick/doc/snippets/qml/opacitymask.qml
+++ /dev/null
@@ -1,124 +0,0 @@
-/****************************************************************************
-**
-** Copyright (C) 2014 Gunnar Sletta <gunnar@sletta.org>
-** Contact: https://www.qt.io/licensing/
-**
-** This file is part of the documentation of the Qt Toolkit.
-**
-** $QT_BEGIN_LICENSE:BSD$
-** 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.
-**
-** BSD License Usage
-** Alternatively, 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 {
-    id: root
-    width: 480
-    height: 320
-
-    // The checkers background
-    ShaderEffect {
-        id: tileBackground
-        anchors.fill: parent
-
-        property real tileSize: 20
-        property color color1: Qt.hsla(0, 0, 0.1);
-        property color color2: Qt.hsla(0, 0, 0.2);
-
-        property size pixelSize: Qt.size(width / tileSize, height / tileSize);
-
-        fragmentShader:
-            "
-            uniform lowp vec4 color1;
-            uniform lowp vec4 color2;
-            uniform highp vec2 pixelSize;
-            varying highp vec2 qt_TexCoord0;
-            void main() {
-                highp vec2 tc = sign(sin(3.14159265358979323846 * qt_TexCoord0 * pixelSize));
-                if (tc.x != tc.y)
-                    gl_FragColor = color1;
-                else
-                    gl_FragColor = color2;
-            }
-            "
-    }
-
-//! [1]
-    Rectangle {
-        id: gradientRect;
-        width: 10
-        height: 10
-        gradient: Gradient {
-            GradientStop { position: 0; color: "white" }
-            GradientStop { position: 1; color: "steelblue" }
-        }
-        visible: false; // should not be visible on screen.
-        layer.enabled: true;
-        layer.smooth: true
-    }
-
-    Text {
-        id: textItem
-        font.pixelSize: 48
-        text: "Gradient Text"
-        anchors.centerIn: parent
-        layer.enabled: true
-        // This item should be used as the 'mask'
-        layer.samplerName: "maskSource"
-        layer.effect: ShaderEffect {
-            property var colorSource: gradientRect;
-            fragmentShader: "
-                uniform lowp sampler2D colorSource;
-                uniform lowp sampler2D maskSource;
-                uniform lowp float qt_Opacity;
-                varying highp vec2 qt_TexCoord0;
-                void main() {
-                    gl_FragColor =
-                        texture2D(colorSource, qt_TexCoord0)
-                        * texture2D(maskSource, qt_TexCoord0).a
-                        * qt_Opacity;
-                }
-            "
-        }
-    }
-//! [1]
-}