57 lines
1.5 KiB
GLSL
57 lines
1.5 KiB
GLSL
#version 450
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#extension GL_GOOGLE_include_directive : enable
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#include "lib/common.glsl"
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#include "lib/ui.glsl"
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SAMPLER_ARRAY(2, textures)
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IN(0, vec4, color)
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IN(1, vec2, texcoord)
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IN(2, vec2, position)
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IN(3, flat vec2, center)
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IN(4, flat vec2, half_size)
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IN(5, flat uint, quad_index)
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OUT(0, vec4, color)
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void main()
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{
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Quad quad = quads.item[in_quad_index];
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// shrink the rectangle's half-size that is used for distance calculations
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// otherwise the underlying primitive will cut off the falloff too early.
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vec2 softness_padding = vec2(max(0, quad.edge_softness*2-1),
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max(0, quad.edge_softness*2-1));
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// sample distance to rect at position
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float dist = RoundedRectSDF(in_position,
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in_center,
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in_half_size-softness_padding,
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quad.corner_radius);
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// map distance to a blend factor
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float sdf_factor = 1 - smoothstep(0, 2*quad.edge_softness, dist);
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float border_factor = 1.f;
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if(quad.border > 0)
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{
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vec2 interior_half_size = in_half_size - vec2(quad.border);
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float interior_radius = quad.corner_radius - quad.border;
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// calculate sample distance from interior
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float inside_d = RoundedRectSDF(in_position,
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in_center,
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interior_half_size-
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softness_padding,
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interior_radius);
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// map distance => factor
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float inside_f = smoothstep(0, 2*quad.edge_softness, inside_d);
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border_factor = inside_f;
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}
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vec4 sample0 = texture(textures[quad.texture], in_texcoord);
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out_color = in_color * sample0 * sdf_factor * border_factor;
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}
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