53 lines
1.9 KiB
Text
53 lines
1.9 KiB
Text
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shader_type canvas_item;
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uniform vec4 line_color : source_color = vec4(1);
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uniform float line_thickness : hint_range(0, 20) = 0.0;
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uniform bool add_margins = true;
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void vertex() {
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if (add_margins) {
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VERTEX += (UV * 2.0 - 1.0) * line_thickness;
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}
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}
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void fragment() {
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vec2 uv = UV;
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if (add_margins) {
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vec2 texture_pixel_size = vec2(1.0) / (vec2(1.0) / TEXTURE_PIXEL_SIZE + vec2(line_thickness * 2.0));
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uv = (uv - texture_pixel_size * line_thickness) * TEXTURE_PIXEL_SIZE / texture_pixel_size;
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if (uv != clamp(uv, vec2(0.0), vec2(1.0))) {
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COLOR.a = 0.0;
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} else {
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COLOR = texture(TEXTURE, uv);
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}
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} else {
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COLOR = texture(TEXTURE, uv);
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}
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vec2 size = TEXTURE_PIXEL_SIZE * line_thickness;
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if (line_thickness < 0.1) {
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vec4 color = texture(TEXTURE, uv);
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COLOR = color;
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} else {
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float outline = texture(TEXTURE, uv + vec2(-size.x, 0)).a;
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outline += texture(TEXTURE, uv + vec2(0, size.y)).a;
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outline += texture(TEXTURE, uv + vec2(size.x, 0)).a;
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outline += texture(TEXTURE, uv + vec2(0, -size.y)).a;
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outline += texture(TEXTURE, uv + vec2(-size.x * 0.866, size.y * 0.5)).a;
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outline += texture(TEXTURE, uv + vec2(-size.x * 0.5, size.y * 0.866)).a;
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outline += texture(TEXTURE, uv + vec2(size.x * 0.866, size.y * 0.5)).a;
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outline += texture(TEXTURE, uv + vec2(size.x * 0.5, size.y * 0.866)).a;
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outline += texture(TEXTURE, uv + vec2(-size.x * 0.866, -size.y * 0.5)).a;
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outline += texture(TEXTURE, uv + vec2(-size.x * 0.5, -size.y * 0.866)).a;
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outline += texture(TEXTURE, uv + vec2(size.x * 0.866, -size.y * 0.5)).a;
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outline += texture(TEXTURE, uv + vec2(size.x * 0.5, -size.y * 0.866)).a;
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outline = min(outline, 1.0);
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vec4 color = texture(TEXTURE, uv);
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COLOR = mix(color, line_color, outline - color.a);
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}
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}
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