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#version 450
layout(location = 0) in vec4 v_Color;
layout(location = 1) in vec2 v_Pos;
layout(location = 2) in vec2 v_Scale;
layout(location = 3) in flat uint v_BorderRadius;
layout(location = 0) out vec4 o_Color;
float rounded(in vec2 frag_coord, in vec2 position, in vec2 size, float radius, float s)
{
vec2 inner_size = size - vec2(radius, radius) * 2.0;
vec2 top_left = position + vec2(radius, radius);
vec2 bottom_right = top_left + inner_size;
vec2 top_left_distance = top_left - frag_coord;
vec2 bottom_right_distance = frag_coord - bottom_right;
vec2 distance = vec2(
max(max(top_left_distance.x, bottom_right_distance.x), 0),
max(max(top_left_distance.y, bottom_right_distance.y), 0)
);
float d = sqrt(distance.x * distance.x + distance.y * distance.y);
return 1.0 - smoothstep(radius - s, radius + s, d);
}
void main() {
float radius_alpha = 1.0;
if(v_BorderRadius > 0.0) {
radius_alpha = rounded(gl_FragCoord.xy, v_Pos, v_Scale, v_BorderRadius, 0.5);
}
o_Color = vec4(v_Color.xyz, v_Color.w * radius_alpha);
}
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