-
Notifications
You must be signed in to change notification settings - Fork 7
/
Copy path33_CrossGrid.fs
executable file
·175 lines (157 loc) · 3.06 KB
/
33_CrossGrid.fs
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
// SaturdayShader Week 33 : CrossGrid
// Joseph Fiola (http://www.joefiola.com)
// 2016-04-02
// Based on http://thebookofshaders.com/edit.html#09/cross.frag
// by Patricio Gonzalez Vivo - www.patriciogonzalezvivo.com
/*{
"CREDIT": "",
"DESCRIPTION": "",
"CATEGORIES": [
"Generator"
],
"INPUTS": [
{
"NAME": "zoom",
"TYPE": "float",
"DEFAULT": 8.0,
"MIN": 0.0,
"MAX": 100.0
},
{
"NAME": "scale",
"TYPE": "float",
"DEFAULT": 0.5,
"MIN": 0.0,
"MAX": 15.0
},
{
"NAME": "rotate",
"TYPE": "float",
"DEFAULT": 0.0,
"MIN": 0.0,
"MAX": 1.0
},
{
"NAME": "spin",
"TYPE": "float",
"DEFAULT": 0.0,
"MIN": 0.0,
"MAX": 1.0
},
{
"NAME": "centerOffset",
"TYPE": "float",
"DEFAULT": 0.0,
"MIN": 0.0,
"MAX": 1.0
},
{
"NAME": "verticalHeight",
"TYPE": "float",
"DEFAULT": 0.125,
"MIN": -0.1,
"MAX": 0.5
},
{
"NAME": "verticalWidth",
"TYPE": "float",
"DEFAULT": 0.5,
"MIN": -0.1,
"MAX": 0.5
},
{
"NAME": "horizontalHeight",
"TYPE": "float",
"DEFAULT": 0.5,
"MIN": -0.1,
"MAX": 0.5
},
{
"NAME": "horizontalWidth",
"TYPE": "float",
"DEFAULT": 0.125,
"MIN": -0.1,
"MAX": 0.5
},
{
"NAME": "grid",
"TYPE": "float",
"DEFAULT": 5.0,
"MIN": 0.0,
"MAX": 100.0
},
{
"NAME": "gridRotate",
"TYPE": "float",
"DEFAULT": 0.0,
"MIN": 0.0,
"MAX": 1.0
},
{
"NAME": "linesThickness",
"TYPE": "float",
"DEFAULT": 0.99,
"MIN": 0.25,
"MAX": 1.0
},
{
"NAME": "invert",
"TYPE": "bool"
},
{
"NAME": "pos",
"TYPE": "point2D",
"DEFAULT": [0.5,0.5],
"MIN":[0.0,0.0],
"MAX":[1.0,1.0]
}
]
}*/
#ifdef GL_ES
precision mediump float;
#endif
#define TWO_PI 6.28318530718
mat2 rotate2d(float _angle){
return mat2(cos(_angle),-sin(_angle),
sin(_angle),cos(_angle));
}
vec2 tile(vec2 _st, float _zoom){
_st *= _zoom;
return fract(_st);
}
float box(in vec2 _st, in vec2 _size){
_size = vec2(0.5) - _size * 0.5;
vec2 uv = smoothstep(_size,
_size+vec2(0.001),
_st);
uv *= smoothstep(_size,
_size+vec2(0.001),
vec2(1.0)-_st);
return uv.x*uv.y;
}
float cross(in vec2 _st, float _size){
return box(_st, vec2(_size*verticalWidth,_size*verticalHeight)) +
box(_st, vec2(_size*horizontalWidth,_size*horizontalHeight));
}
void main(){
//crosses
vec2 st = gl_FragCoord.xy / RENDERSIZE.xy;
st -= vec2(pos);
st.x *= RENDERSIZE.x/RENDERSIZE.y;
st = rotate2d(rotate*-TWO_PI) * st;
st = tile(st,zoom);
st -= 0.5;
st = rotate2d(spin*-TWO_PI) * st;
st += centerOffset;
vec3 color = vec3( clamp(cross(fract(st),scale),0.0,1.0) );
//square grids
st = gl_FragCoord.xy / RENDERSIZE.xy;
st -= vec2(pos);
st.x *= RENDERSIZE.x/RENDERSIZE.y;
st = rotate2d(gridRotate*-TWO_PI/2.0) * st;
st += centerOffset;
st = tile(st,grid);
color += vec3(box(st,vec2(linesThickness))) * -1.0 + 1.0;
if (invert) color = color *-1.0 + 1.0;
gl_FragColor = vec4(color,1.0);
}