33 lines
878 B
GLSL
33 lines
878 B
GLSL
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precision mediump float;
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uniform float alpha;
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#if defined(DEBUG_FLAGS)
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uniform float tint;
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#endif
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uniform vec2 size;
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varying vec2 v_coords;
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uniform vec3 color;
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uniform float thickness;
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uniform float radius;
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float rounded_box(vec2 center, vec2 size, float radius) {
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return length(max(abs(center) - size + radius, 0.0)) - radius;
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}
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void main() {
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vec2 center = size / 2.0 - vec2(0.5);
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vec2 location = v_coords * size;
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vec4 mix_color;
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float distance = rounded_box(location - center, size / 2.0 - vec2(thickness / 2.0), radius);
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float smoothedAlpha = 1.0 - smoothstep(0.0, 2.0, abs(distance) - (thickness / 2.0));
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mix_color = mix(vec4(0.0, 0.0, 0.0, 0.0), vec4(color, alpha), smoothedAlpha);
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#if defined(DEBUG_FLAGS)
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if (tint == 1.0)
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mix_color = vec4(0.0, 0.3, 0.0, 0.2) + mix_color * 0.8;
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#endif
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gl_FragColor = mix_color;
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}
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