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45 lines
1.4 KiB
GLSL
45 lines
1.4 KiB
GLSL
/*
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The shader code has been refactored for the KivyMD library.
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You can find the original code of this shaders at the links:
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https://www.shadertoy.com/view/WtdSDs
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https://www.shadertoy.com/view/fsdyzB
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Additional thanks to iq for optimizing conditional block for individual
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corner radius:
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https://iquilezles.org/articles/distfunctions
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*/
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float roundedBoxSDF(vec2 centerPosition, vec2 size, vec4 radius) {
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radius.xy = (centerPosition.x > 0.0) ? radius.xy : radius.zw;
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radius.x = (centerPosition.y > 0.0) ? radius.x : radius.y;
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vec2 q = abs(centerPosition) - (size - shadow_softness) + radius.x;
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return min(max(q.x, q.y), 0.0) + length(max(q, 0.0)) - radius.x;
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}
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void mainImage(out vec4 fragColor, in vec2 fragCoord) {
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// Smooth the result (free antialiasing).
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float edge0 = 0.0;
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float smoothedAlpha = 1.0 - smoothstep(0.0, edge0, 1.0);
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// Get the resultant shape.
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vec4 quadColor = mix(
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vec4(
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shadow_color[0],
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shadow_color[1],
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shadow_color[2],
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0.0
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),
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shadow_color,
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smoothedAlpha
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);
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// Apply a drop shadow effect.
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float shadowDistance = roundedBoxSDF(
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fragCoord.xy - mouse.xy - (size / 2.0), size / 2.0, shadow_radius
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);
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float shadowAlpha = 1.0 - smoothstep(
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-shadow_softness, shadow_softness, shadowDistance
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);
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fragColor = mix(quadColor, shadow_color, shadowAlpha - smoothedAlpha);
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}
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