69 lines
2.2 KiB
Text
69 lines
2.2 KiB
Text
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shader_type canvas_item;
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render_mode unshaded;
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uniform float thickness : hint_range(0.0, 100.0);
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uniform int ring_count : hint_range(1,128) = 16;
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uniform float ring_offset : hint_range(0.0, 1.0, 0.01);
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uniform vec4 outline_color : source_color;
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uniform bool border_clipping_fix = true;
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uniform float aspect_ratio : hint_range(0.1, 10.0, 0.01) = 1.0;
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uniform bool square_border = false;
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uniform vec2 offset;
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uniform bool max_or_add = false;
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void vertex(){
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if (border_clipping_fix){
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vec2 o = (UV * 2.0 - 1.0);
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VERTEX += o * thickness - offset;
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VERTEX.x *= 1.0 + (aspect_ratio-1.0) * (thickness * TEXTURE_PIXEL_SIZE.x) * 2.0;
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}
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}
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vec2 square(float i){ // samples a square pattern
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i *= 2.0;
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return (vec2(
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clamp(abs(mod(i,2.0)-1.0),0.25,0.75),
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clamp(abs(mod(i+0.5,2.0)-1.0),0.25,0.75)
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)-0.5)*4.0;
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}
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vec4 tex(sampler2D sampler, vec2 uv){
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vec4 clr;
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if (uv.x > 0.0 && uv.y > 0.0 && uv.x < 1.0 && uv.y < 1.0){ // bleeding texture sampling fix
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clr = texture(sampler, uv);
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}else{clr = vec4(0.0);}
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return clr;
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}
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void fragment(){
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vec2 o = offset / vec2(textureSize(TEXTURE, 0));
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vec2 uv = UV;
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uv -= vec2(0.5);
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if (border_clipping_fix){
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uv.x *= 1.0 + (aspect_ratio-1.0) * thickness * TEXTURE_PIXEL_SIZE.x * 2.0;
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uv *= (1.0 + (thickness * TEXTURE_PIXEL_SIZE * 2.0));
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uv -= o;
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}
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uv += vec2(0.5);
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vec2 size = vec2(thickness) / vec2(textureSize(TEXTURE, 0));
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vec4 sprite_color = tex(TEXTURE, uv);
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float alpha = sprite_color.a;
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if (square_border){
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for(int i=0;i<ring_count;++i){
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float r = float(i) / float(ring_count) + ring_offset;
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alpha = max(alpha,texture(TEXTURE, uv + o + size * square(r) * vec2(aspect_ratio,1.0)).a * outline_color.a);}// texture sampling fix is disabled because both with and without give the same result
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}else{
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for(int i=0;i<ring_count;++i){
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float r = float(i) * 3.14159 / float(ring_count) * 2.0 + ring_offset;
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if (max_or_add){
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alpha = alpha+tex(TEXTURE, uv + o + vec2(size.x * sin(r) * aspect_ratio, size.y * cos(r))).a * outline_color.a;
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}else{
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alpha = max(alpha,tex(TEXTURE, uv + o + vec2(size.x * sin(r) * aspect_ratio, size.y * cos(r))).a * outline_color.a);
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}
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}
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}
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vec3 final_color = mix(outline_color.rgb, sprite_color.rgb, sprite_color.a);
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COLOR = vec4(final_color, clamp(alpha, 0.0, 1.0));
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}
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