1 files changed, 95 insertions, 0 deletions
diff --git a/src/opengl/doc/snippets/code/src_opengl_qgraphicsshadereffect.cpp b/src/opengl/doc/snippets/code/src_opengl_qgraphicsshadereffect.cpp
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@@ -0,0 +1,95 @@
+/****************************************************************************
+**
+** Copyright (C) 2018 The Qt Company Ltd.
+** 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."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+//! [0]
+    static char const colorizeShaderCode[] =
+        "uniform lowp vec4 effectColor;\n"
+        "lowp vec4 customShader(lowp sampler2D imageTexture, highp vec2 textureCoords) {\n"
+        "    vec4 src = texture2D(imageTexture, textureCoords);\n"
+        "    float gray = dot(src.rgb, vec3(0.212671, 0.715160, 0.072169));\n"
+        "    vec4 colorize = 1.0-((1.0-gray)*(1.0-effectColor));\n"
+        "    return vec4(colorize.rgb, src.a);\n"
+        "}";
+//! [0]
+
+//! [1]
+    class ColorizeEffect : public QGraphicsShaderEffect
+    {
+        Q_OBJECT
+    public:
+        ColorizeEffect(QObject *parent = 0)
+            : QGraphicsShaderEffect(parent), color(Qt::black)
+        {
+            setPixelShaderFragment(colorizeShaderCode);
+        }
+
+        QColor effectColor() const { return color; }
+        void setEffectColor(const QColor& c)
+        {
+            color = c;
+            setUniformsDirty();
+        }
+
+    protected:
+        void setUniforms(QGLShaderProgram *program)
+        {
+            program->setUniformValue("effectColor", color);
+        }
+
+    private:
+        QColor color;
+    };
+//! [1]
+
+//! [2]
+    lowp vec4 customShader(lowp sampler2D imageTexture, highp vec2 textureCoords) {
+        return texture2D(imageTexture, textureCoords);
+    }
+//! [2]