58 lines
1.7 KiB
GLSL
58 lines
1.7 KiB
GLSL
#version 330 core
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out vec4 pixel_color;
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in vec4 frag_color;
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in vec2 frag_dest_position;
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in vec2 frag_dest_center;
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in vec2 frag_dest_half_size;
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in float frag_softness;
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in float frag_border_radius;
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in float frag_border_thickness;
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in vec4 frag_border_color;
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float roundedRectSDF(vec2 sample_pos, vec2 rect_center, vec2 rect_half_size, float r) {
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vec2 d2 = (abs(rect_center - sample_pos) - rect_half_size + vec2(r, r));
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return min(max(d2.x, d2.y), 0.0) + length(max(d2, 0.0)) - r;
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}
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void main() {
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vec2 softness_padding = vec2(
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max(0, frag_softness*2-1),
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max(0, frag_softness*2-1));
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float border_factor = 1.0f;
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if (frag_border_thickness != 0) {
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vec2 interior_half_size = frag_dest_half_size - vec2(frag_border_thickness);
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float interior_radius_reduce_f = min(
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interior_half_size.x / frag_dest_half_size.x,
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interior_half_size.y / frag_dest_half_size.y);
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float interior_corner_radius = frag_border_radius * interior_radius_reduce_f * interior_radius_reduce_f;
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float inside_d = roundedRectSDF(
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frag_dest_position,
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frag_dest_center,
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interior_half_size - softness_padding,
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interior_corner_radius);
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float inside_f = smoothstep(0, 2*frag_softness, inside_d);
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border_factor = inside_f;
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}
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float dist = roundedRectSDF(
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frag_dest_position,
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frag_dest_center,
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frag_dest_half_size - softness_padding,
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frag_border_radius);
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// For texturing later
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float sample = 1;
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float sdf_factor = 1 - smoothstep(0, 2*frag_softness, dist);
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pixel_color = frag_border_color * sample * sdf_factor * border_factor
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+ frag_color * sample * sdf_factor;
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};
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