Port 17 effects to RHI, remove 8 unportable ones

The following are based on static shader code, and after porting the
shaders they will work fully identically to 5.15:

FastBlur
Colorize
OpacityMask
BrightnessContrast
ColorOverlay
Desaturate
Displace
GammaAdjust
HueSaturation
LevelAdjust
RectangularGlow
Thresholdmask
LinearGradient
RadialGradient
ConicalGradient

The following change behavior:

Glow
DropShadow

These now only have the fast variants, because those rely on static shader code.
So we are going back to the Qt 5.5 versions and make them behave as if 'fast'
was always set to true. The 'fast' and 'samples' properties are removed.

The following are removed:

Blend
GaussianBlur
DirectionalBlur
MaskedBlur
RadialBlur
RecursiveBlur
ZoomBlur
InnerShadow

The autotest and the gallery application (run qmlscene testBed.qml in
tests/manual/testbed) have been adjusted accordingly and now work across
all QRhi backends.

The docs may still refer to removed effects in some code snippets. Updating
that is left as a separate exercise.

[ChangeLog] Graphical Effects no longer relies on dynamically generated
shader strings. The following effects have been removed: Blend, GaussianBlur,
MaskedBlur, RadialBlur, RecursiveBlur, ZoomBlur, InnerShadow. Glow
and DropShadow always use the 'fast' variant. The fast and samples
properties for these are thus no longer applicable and have been
removed.

Change-Id: Ife83f3828f37977596fd34f8da8b61961f0ed28a
Reviewed-by: Mitch Curtis <mitch.curtis@qt.io>
Reviewed-by: Andy Nichols <andy.nichols@qt.io>

1 files changed, 0 insertions, 306 deletions

diff --git a/src/effects/ZoomBlur.qml b/src/effects/ZoomBlur.qml
deleted file mode 100644
index 66ba710..0000000
--- a/src/effects/ZoomBlur.qml
+++ /dev/null
@@ -1,306 +0,0 @@
-/****************************************************************************
-**
-** Copyright (C) 2017 The Qt Company Ltd.
-** Contact: https://www.qt.io/licensing/
-**
-** This file is part of the Qt Graphical Effects module.
-**
-** $QT_BEGIN_LICENSE:LGPL$
-** 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 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.LGPL3 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-3.0.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 (at your option) the GNU General
-** Public license version 3 or any later version approved by the KDE Free
-** Qt Foundation. The licenses are as published by the Free Software
-** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
-** 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-2.0.html and
-** https://www.gnu.org/licenses/gpl-3.0.html.
-**
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-
-import QtQuick 2.12
-import QtGraphicalEffects.private 1.12
-
-/*!
-    \qmltype ZoomBlur
-    \inqmlmodule QtGraphicalEffects
-    \since QtGraphicalEffects 1.0
-    \inherits QtQuick2::Item
-    \ingroup qtgraphicaleffects-motion-blur
-    \brief Applies directional blur effect towards source items center point.
-
-    Effect creates perceived impression that the source item appears to be
-    moving towards the center point in Z-direction or that the camera appears
-    to be zooming rapidly. Other available motion blur effects are
-    \l{QtGraphicalEffects::DirectionalBlur}{DirectionalBlur}
-    and \l{QtGraphicalEffects::RadialBlur}{RadialBlur}.
-
-    \table
-    \header
-        \li Source
-        \li Effect applied
-    \row
-        \li \image Original_bug.png
-        \li \image ZoomBlur_bug.png
-    \endtable
-
-    \note This effect is available when running with OpenGL.
-
-    \section1 Example
-
-    The following example shows how to apply the effect.
-    \snippet ZoomBlur-example.qml example
-
-*/
-Item {
-    id: rootItem
-
-    /*!
-        This property defines the source item that is going to be blurred.
-
-        \note It is not supported to let the effect include itself, for
-        instance by setting source to the effect's parent.
-    */
-    property variant source
-
-    /*!
-        This property defines the maximum perceived amount of movement for each
-        pixel. The amount is smaller near the center and reaches the specified
-        value at the edges.
-
-        The quality of the blur depends on \l{ZoomBlur::samples}{samples}
-        property. If length value is large, more samples are needed to keep the
-        visual quality at high level.
-
-        The value ranges from 0.0 to inf. By default the property is set to \c
-        0.0 (no blur).
-
-        \table
-        \header
-        \li Output examples with different length values
-        \li
-        \li
-        \row
-            \li \image ZoomBlur_length1.png
-            \li \image ZoomBlur_length2.png
-            \li \image ZoomBlur_length3.png
-        \row
-            \li \b { length: 0.0 }
-            \li \b { length: 32.0 }
-            \li \b { length: 48.0 }
-        \row
-            \li \l samples: 24
-            \li \l samples: 24
-            \li \l samples: 24
-        \row
-            \li \l horizontalOffset: 0
-            \li \l horizontalOffset: 0
-            \li \l horizontalOffset: 0
-        \row
-            \li \l verticalOffset: 0
-            \li \l verticalOffset: 0
-            \li \l verticalOffset: 0
-        \endtable
-
-    */
-    property real length: 0.0
-
-    /*!
-        This property defines how many samples are taken per pixel when blur
-        calculation is done. Larger value produces better quality, but is slower
-        to render.
-
-        This property is not intended to be animated. Changing this property may
-        cause the underlying OpenGL shaders to be recompiled.
-
-        Allowed values are between 0 and inf (practical maximum depends on GPU).
-        By default the property is set to \c 0 (no samples).
-
-    */
-    property int samples: 0
-
-    /*!
-        \qmlproperty real QtGraphicalEffects::ZoomBlur::horizontalOffset
-        \qmlproperty real QtGraphicalEffects::ZoomBlur::verticalOffset
-
-        These properties define an offset in pixels for the blur direction
-        center point.
-
-        The values range from -inf to inf. By default these properties are set
-        to \c 0.
-
-        \table
-        \header
-        \li Output examples with different horizontalOffset values
-        \li
-        \li
-        \row
-            \li \image ZoomBlur_horizontalOffset1.png
-            \li \image ZoomBlur_horizontalOffset2.png
-            \li \image ZoomBlur_horizontalOffset3.png
-        \row
-            \li \b { horizontalOffset: 100.0 }
-            \li \b { horizontalOffset: 0.0 }
-            \li \b { horizontalOffset: -100.0 }
-        \row
-            \li \l samples: 24
-            \li \l samples: 24
-            \li \l samples: 24
-        \row
-            \li \l length: 32
-            \li \l length: 32
-            \li \l length: 32
-        \row
-            \li \l verticalOffset: 0
-            \li \l verticalOffset: 0
-            \li \l verticalOffset: 0
-        \endtable
-    */
-    property real horizontalOffset: 0.0
-    property real verticalOffset: 0.0
-
-    /*!
-        This property defines the blur behavior near the edges of the item,
-        where the pixel blurring is affected by the pixels outside the source
-        edges.
-
-        If the property is set to \c true, the pixels outside the source are
-        interpreted to be transparent, which is similar to OpenGL
-        clamp-to-border extension. The blur is expanded slightly outside the
-        effect item area.
-
-        If the property is set to \c false, the pixels outside the source are
-        interpreted to contain the same color as the pixels at the edge of the
-        item, which is similar to OpenGL clamp-to-edge behavior. The blur does
-        not expand outside the effect item area.
-
-        By default, the property is set to \c false.
-
-    */
-    property bool transparentBorder: false
-
-    /*!
-        This property allows the effect output pixels to be cached in order to
-        improve the rendering performance.
-
-        Every time the source or effect properties are changed, the pixels in
-        the cache must be updated. Memory consumption is increased, because an
-        extra buffer of memory is required for storing the effect output.
-
-        It is recommended to disable the cache when the source or the effect
-        properties are animated.
-
-        By default, the property is set to \c false.
-    */
-    property bool cached: false
-
-    SourceProxy {
-        id: sourceProxy
-        input: rootItem.source
-        sourceRect: rootItem.transparentBorder ? Qt.rect(-1, -1, parent.width + 2.0, parent.height + 2.0) : Qt.rect(0, 0, 0, 0)
-    }
-
-    ShaderEffectSource {
-        id: cacheItem
-        anchors.fill: shaderItem
-        visible: rootItem.cached
-        smooth: true
-        sourceItem: shaderItem
-        live: true
-        hideSource: visible
-    }
-
-    ShaderEffect {
-        id: shaderItem
-        property variant source: sourceProxy.output
-        property variant center: Qt.point(0.5 + rootItem.horizontalOffset / width, 0.5 + rootItem.verticalOffset / height)
-        property real len: rootItem.length
-        property bool transparentBorder: rootItem.transparentBorder
-        property real samples: rootItem.samples
-        property real weight: 1.0 / Math.max(1.0, rootItem.samples)
-        property variant expandPixels: transparentBorder ? Qt.size(rootItem.samples, rootItem.samples) : Qt.size(0,0)
-        property variant expand: transparentBorder ? Qt.size(expandPixels.width / width, expandPixels.height / height) : Qt.size(0,0)
-        property variant delta: Qt.size(1.0 / rootItem.width, 1.0 / rootItem.height)
-
-        x: transparentBorder ? -expandPixels.width - 1 : 0
-        y: transparentBorder ? -expandPixels.height - 1 : 0
-        width: transparentBorder ? parent.width + 2.0 * expandPixels.width + 2 : parent.width
-        height: transparentBorder ? parent.height + 2.0 * expandPixels.height + 2 : parent.height
-
-        property string fragmentShaderSkeleton: "
-            varying highp vec2 qt_TexCoord0;
-            uniform highp float qt_Opacity;
-            uniform lowp sampler2D source;
-            uniform highp float len;
-            uniform highp float weight;
-            uniform highp float samples;
-            uniform highp vec2 center;
-            uniform highp vec2 expand;
-            uniform highp vec2 delta;
-
-            void main(void) {
-                mediump vec2 texCoord = qt_TexCoord0;
-                mediump vec2 centerCoord = center;
-
-                PLACEHOLDER_EXPAND_STEPS
-
-                highp vec2 dir = vec2(centerCoord.x - texCoord.s, centerCoord.y - texCoord.t);
-                dir /= max(1.0, length(dir) * 2.0);
-                highp vec2 shift = delta * len * dir * 2.0 / max(1.0, samples - 1.0);
-                gl_FragColor = vec4(0.0);
-
-                PLACEHOLDER_UNROLLED_LOOP
-
-                gl_FragColor *= weight * qt_Opacity;
-            }
-        "
-
-        function buildFragmentShader() {
-            var shader = ""
-            if (GraphicsInfo.profile == GraphicsInfo.OpenGLCoreProfile)
-                shader += "#version 150 core\n#define varying in\n#define gl_FragColor fragColor\n#define texture2D texture\nout vec4 fragColor;\n"
-            shader += fragmentShaderSkeleton
-            var expandSteps = ""
-
-            if (transparentBorder) {
-                expandSteps += "centerCoord = (centerCoord - expand) / (1.0 - 2.0 * expand);"
-                expandSteps += "texCoord = (texCoord - expand) / (1.0 - 2.0 * expand);"
-             }
-
-             var unrolledLoop = "gl_FragColor += texture2D(source, texCoord);\n"
-
-             if (rootItem.samples > 1) {
-                 unrolledLoop = ""
-                 for (var i = 0; i < rootItem.samples; i++)
-                      unrolledLoop += "gl_FragColor += texture2D(source, texCoord); texCoord += shift;\n"
-             }
-
-             shader = shader.replace("PLACEHOLDER_EXPAND_STEPS", expandSteps)
-             fragmentShader = shader.replace("PLACEHOLDER_UNROLLED_LOOP", unrolledLoop)
-        }
-
-        onFragmentShaderChanged: sourceChanged()
-        onSamplesChanged: buildFragmentShader()
-        onTransparentBorderChanged: buildFragmentShader()
-        Component.onCompleted: buildFragmentShader()
-    }
-}