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39 lines
886 B
GLSL
39 lines
886 B
GLSL
10 years ago
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#ifdef GL_ES
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precision mediump float;
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#endif
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uniform vec2 u_resolution;
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uniform vec2 u_mouse;
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uniform float u_time;
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// Reference
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// http://thndl.com/category/shaders.html
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void main(){
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vec2 st = gl_FragCoord.xy/u_resolution.xy;
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st.x *= u_resolution.x/u_resolution.y;
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vec3 color = vec3(0.0);
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float d = 0.0;
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// Remap the space to -1. to 1.
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st = st *2.-1.;
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// Rectangular
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vec2 r = abs(st);
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color = vec3(r,0.);
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// d = max(r.x,r.y);
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// color = vec3(d);
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// color = vec3( step(.4,d) );
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// color = vec3( step(.4,d) * step(d,.5) );
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// color = vec3(smoothstep(.3,.4,d)* smoothstep(.6,.5,d));
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// Rectangular round corners
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// d = length( max( abs(st)-.3, 0.) );
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// color = vec3(d);
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// color = vec3( step(.4,d) );
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// color = vec3( step(.4,d) * step(d,.5) );
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// color = vec3(smoothstep(.3,.4,d)* smoothstep(.6,.5,d));
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gl_FragColor = vec4(color,1.0);
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}
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