66 lines
1.7 KiB
Plaintext
66 lines
1.7 KiB
Plaintext
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[gd_resource type="Shader" format=2]
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[resource]
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code = "shader_type canvas_item;
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uniform vec4 color : hint_color = vec4(1.0);
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uniform float width : hint_range(0, 10) = 1.0;
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uniform int pattern : hint_range(0, 2) = 0; // diamond, circle, square
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uniform bool inside = false;
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uniform bool add_margins = true; // only useful when inside is false
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void vertex() {
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if (add_margins) {
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VERTEX += (UV * 2.0 - 1.0) * width;
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}
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}
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bool hasContraryNeighbour(vec2 uv, vec2 texture_pixel_size, sampler2D texture) {
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for (float i = -ceil(width); i <= ceil(width); i++) {
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float x = abs(i) > width ? width * sign(i) : i;
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float offset;
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if (pattern == 0) {
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offset = width - abs(x);
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} else if (pattern == 1) {
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offset = floor(sqrt(pow(width + 0.5, 2) - x * x));
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} else if (pattern == 2) {
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offset = width;
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}
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for (float j = -ceil(offset); j <= ceil(offset); j++) {
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float y = abs(j) > offset ? offset * sign(j) : j;
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vec2 xy = uv + texture_pixel_size * vec2(x, y);
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if ((xy != clamp(xy, vec2(0.0), vec2(1.0)) || texture(texture, xy).a == 0.0) == inside) {
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return true;
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}
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}
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}
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return false;
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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(width * 2.0));
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uv = (uv - texture_pixel_size * width) * 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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if ((COLOR.a > 0.0) == inside && hasContraryNeighbour(uv, TEXTURE_PIXEL_SIZE, TEXTURE)) {
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COLOR.rgb = inside ? mix(COLOR.rgb, color.rgb, color.a) : color.rgb;
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COLOR.a += (1.0 - COLOR.a) * color.a;
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}
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}"
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