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https://github.com/Ttanasart-pt/Pixel-Composer.git
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17 lines
415 B
Text
17 lines
415 B
Text
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//
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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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#define pi2 1.57079
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void main() {
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vec2 center = v_vTexcoord - vec2(0.5, 0.5);
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float radius = distance(v_vTexcoord, vec2(0.5, 0.5)) / (sqrt(2.) * .5);
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float angle = (atan(center.y, center.x) / pi2 + 1.) / 2.;
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vec2 polar = vec2(radius, angle);
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gl_FragColor = v_vColour * texture2D( gm_BaseTexture, polar );
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}
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