1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
|
/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/
**
** This file is part of the Qt Graphical Effects module.
**
** $QT_BEGIN_LICENSE:BSD$
** 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 Nokia Corporation and its Subsidiary(-ies) 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
import "private"
Item {
id: rootItem
property variant source
property real length: 0.0
property int samples: 0
property real horizontalOffset: 0.0
property real verticalOffset: 0.0
property bool transparentBorder: 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 = 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()
}
}
|
