56 lines
1.7 KiB
Forth
56 lines
1.7 KiB
Forth
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// Created by inigo quilez - iq/2013
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// https://www.youtube.com/c/InigoQuilez
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// https://iquilezles.org/
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// Shows how to use the mouse input (only left button supported):
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//
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// mouse.xy = mouse position during last button down
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// abs(mouse.zw) = mouse position during last button click
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// sign(mouze.z) = button is down
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// sign(mouze.w) = button is clicked
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// See also:
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//
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// Input - Keyboard : https://www.shadertoy.com/view/lsXGzf
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// Input - Microphone : https://www.shadertoy.com/view/llSGDh
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// Input - Mouse : https://www.shadertoy.com/view/Mss3zH
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// Input - Sound : https://www.shadertoy.com/view/Xds3Rr
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// Input - SoundCloud : https://www.shadertoy.com/view/MsdGzn
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// Input - Time : https://www.shadertoy.com/view/lsXGz8
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// Input - TimeDelta : https://www.shadertoy.com/view/lsKGWV
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// Inout - 3D Texture : https://www.shadertoy.com/view/4llcR4
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float distanceToSegment( vec2 a, vec2 b, vec2 p )
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{
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vec2 pa = p - a, ba = b - a;
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float h = clamp( dot(pa,ba)/dot(ba,ba), 0.0, 1.0 );
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return length( pa - ba*h );
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}
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void mainImage( out vec4 fragColor, in vec2 fragCoord )
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{
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vec2 p = fragCoord / iResolution.x;
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vec2 cen = 0.5*iResolution.xy/iResolution.x;
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vec4 m = iMouse / iResolution.x;
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vec3 col = vec3(0.0);
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if( m.z>0.0 ) // button is down
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{
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float d = distanceToSegment( m.xy, abs(m.zw), p );
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col = mix( col, vec3(1.0,1.0,0.0), 1.0-smoothstep(.004,0.008, d) );
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}
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if( m.w>0.0 ) // button click
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{
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col = mix( col, vec3(1.0,1.0,1.0), 1.0-smoothstep(0.1,0.105, length(p-cen)) );
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}
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col = mix( col, vec3(1.0,0.0,0.0), 1.0-smoothstep(0.03,0.035, length(p- m.xy )) );
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col = mix( col, vec3(0.0,0.0,1.0), 1.0-smoothstep(0.03,0.035, length(p-abs(m.zw))) );
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fragColor = vec4( col, 1.0 );
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}
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