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https://github.com/Ttanasart-pt/Pixel-Composer.git
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36 lines
748 B
GLSL
36 lines
748 B
GLSL
//
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// Simple passthrough fragment shader
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//
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varying vec2 v_vTexcoord;
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varying vec4 v_vColour;
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uniform vec2 dimension;
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#define PI 3.14159265359
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vec4 sample( vec2 pos ) {
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if(pos.x < 0. || pos.y < 0.) return vec4(0.);
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if(pos.x > 1. || pos.y > 1.) return vec4(0.);
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return texture2D( gm_BaseTexture, pos );
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}
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void main() {
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vec2 tx = 1. / dimension;
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//vec4 a = sample( v_vTexcoord );
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//gl_FragColor = a;
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//if(a.a == 1.) return;
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float dist = length(v_vTexcoord - vec2(0.5, 0.5)) * 3.;
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float cir = PI * dist * dimension.x;
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for( float i = 0.; i < cir; i++ ) {
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float angle = 2. * PI * i / cir;
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vec4 b = sample( vec2(0.5, 0.5) + vec2(cos(angle), sin(angle)) * dist * 0.5 );
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if(b.a == 1.) {
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gl_FragColor = b;
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return;
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}
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}
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}
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