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
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
|
/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the examples of Qt for Device Creation.
**
** $QT_BEGIN_LICENSE:BSD$
** 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
Effect {
divider: false
parameters: ListModel {
ListElement {
name: "extent"
value: 0.5
}
}
// Transform slider values, and bind result to shader uniforms
property real curlExtent: 1.0 - parameters.get(0).value
fragmentShaderSrc: "uniform float dividerValue;
uniform float curlExtent;
uniform sampler2D source;
uniform lowp float qt_Opacity;
varying vec2 qt_TexCoord0;
const float minAmount = -0.16;
const float maxAmount = 1.3;
const float PI = 3.141592653589793;
const float scale = 512.0;
const float sharpness = 3.0;
const vec4 bgColor = vec4(1.0, 1.0, 0.8, 1.0);
float amount = curlExtent * (maxAmount - minAmount) + minAmount;
float cylinderCenter = amount;
// 360 degrees * amount
float cylinderAngle = 2.0 * PI * amount;
const float cylinderRadius = 1.0 / PI / 2.0;
vec3 hitPoint(float hitAngle, float yc, vec3 point, mat3 rrotation)
{
float hitPoint = hitAngle / (2.0 * PI);
point.y = hitPoint;
return rrotation * point;
}
vec4 antiAlias(vec4 color1, vec4 color2, float distance)
{
distance *= scale;
if (distance < 0.0) return color2;
if (distance > 2.0) return color1;
float dd = pow(1.0 - distance / 2.0, sharpness);
return ((color2 - color1) * dd) + color1;
}
float distanceToEdge(vec3 point)
{
float dx = abs(point.x > 0.5 ? 1.0 - point.x : point.x);
float dy = abs(point.y > 0.5 ? 1.0 - point.y : point.y);
if (point.x < 0.0) dx = -point.x;
if (point.x > 1.0) dx = point.x - 1.0;
if (point.y < 0.0) dy = -point.y;
if (point.y > 1.0) dy = point.y - 1.0;
if ((point.x < 0.0 || point.x > 1.0) && (point.y < 0.0 || point.y > 1.0)) return sqrt(dx * dx + dy * dy);
return min(dx, dy);
}
vec4 seeThrough(float yc, vec2 p, mat3 rotation, mat3 rrotation)
{
float hitAngle = PI - (acos(yc / cylinderRadius) - cylinderAngle);
vec3 point = hitPoint(hitAngle, yc, rotation * vec3(p, 1.0), rrotation);
if (yc <= 0.0 && (point.x < 0.0 || point.y < 0.0 || point.x > 1.0 || point.y > 1.0))
return bgColor;
if (yc > 0.0)
return texture2D(source, p);
vec4 color = texture2D(source, point.xy);
vec4 tcolor = vec4(0.0);
return antiAlias(color, tcolor, distanceToEdge(point));
}
vec4 seeThroughWithShadow(float yc, vec2 p, vec3 point, mat3 rotation, mat3 rrotation)
{
float shadow = distanceToEdge(point) * 30.0;
shadow = (1.0 - shadow) / 3.0;
if (shadow < 0.0)
shadow = 0.0;
else
shadow *= amount;
vec4 shadowColor = seeThrough(yc, p, rotation, rrotation);
shadowColor.r -= shadow;
shadowColor.g -= shadow;
shadowColor.b -= shadow;
return shadowColor;
}
vec4 backside(float yc, vec3 point)
{
vec4 color = texture2D(source, point.xy);
float gray = (color.r + color.b + color.g) / 15.0;
gray += (8.0 / 10.0) * (pow(1.0 - abs(yc / cylinderRadius), 2.0 / 10.0) / 2.0 + (5.0 / 10.0));
color.rgb = vec3(gray);
return color;
}
void main(void)
{
const float angle = 30.0 * PI / 180.0;
float c = cos(-angle);
float s = sin(-angle);
mat3 rotation = mat3(
c, s, 0,
-s, c, 0,
0.12, 0.258, 1
);
c = cos(angle);
s = sin(angle);
mat3 rrotation = mat3(
c, s, 0,
-s, c, 0,
0.15, -0.5, 1
);
vec3 point = rotation * vec3(qt_TexCoord0, 1.0);
float yc = point.y - cylinderCenter;
vec4 color = vec4(1.0, 0.0, 0.0, 1.0);
if (yc < -cylinderRadius) {
// See through to background
color = bgColor;
} else if (yc > cylinderRadius) {
// Flat surface
color = texture2D(source, qt_TexCoord0);
} else {
float hitAngle = (acos(yc / cylinderRadius) + cylinderAngle) - PI;
float hitAngleMod = mod(hitAngle, 2.0 * PI);
if ((hitAngleMod > PI && amount < 0.5) || (hitAngleMod > PI/2.0 && amount < 0.0)) {
color = seeThrough(yc, qt_TexCoord0, rotation, rrotation);
} else {
point = hitPoint(hitAngle, yc, point, rrotation);
if (point.x < 0.0 || point.y < 0.0 || point.x > 1.0 || point.y > 1.0) {
color = seeThroughWithShadow(yc, qt_TexCoord0, point, rotation, rrotation);
} else {
color = backside(yc, point);
vec4 otherColor;
if (yc < 0.0) {
float shado = 1.0 - (sqrt(pow(point.x - 0.5, 2.0) + pow(point.y - 0.5, 2.0)) / 0.71);
shado *= pow(-yc / cylinderRadius, 3.0);
shado *= 0.5;
otherColor = vec4(0.0, 0.0, 0.0, shado);
} else {
otherColor = texture2D(source, qt_TexCoord0);
}
color = antiAlias(color, otherColor, cylinderRadius - abs(yc));
// This second antialiasing step causes the shader to fail to render, on
// Symbian devices (tested so far using IVE3.5). Running out of scratch
// memory?
}
}
}
gl_FragColor = qt_Opacity * color;
}"
}
|
