Created
April 24, 2022 08:37
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Twirl glsl
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| uniform sampler2D textureMap; //image | |
| uniform float amount; //amount of twirl | |
| void main() { | |
| vec2 uv = gl_TexCoord[0].st-0.5; | |
| float angle = atan2(uv.y,uv.x); | |
| float radius = length(uv); | |
| angle+= radius*amount; | |
| vec2 shifted = radius*vec2(cos(angle), sin(angle)); | |
| gl_FragColor = texture(textureMap, (shifted+0.5)); | |
| } |
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