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45 lines
1007 B
45 lines
1007 B
#version 100
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precision mediump float;
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// Input vertex attributes (from vertex shader)
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varying vec2 fragTexCoord;
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varying vec4 fragColor;
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// Input uniform values
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uniform sampler2D texture0;
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uniform vec4 colDiffuse;
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// NOTE: Add here your custom variables
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const float renderWidth = 800.0; // HARDCODED for example!
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const float renderHeight = 480.0; // Use uniforms instead...
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float radius = 250.0;
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float angle = 0.8;
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uniform vec2 center;
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void main()
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{
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vec2 texSize = vec2(renderWidth, renderHeight);
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vec2 tc = fragTexCoord*texSize;
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tc -= center;
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float dist = length(tc);
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if (dist < radius)
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{
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float percent = (radius - dist)/radius;
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float theta = percent*percent*angle*8.0;
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float s = sin(theta);
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float c = cos(theta);
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tc = vec2(dot(tc, vec2(c, -s)), dot(tc, vec2(s, c)));
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}
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tc += center;
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vec4 color = texture2D(texture0, tc/texSize)*colDiffuse*fragColor;;
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gl_FragColor = vec4(color.rgb, 1.0);;
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}
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