mirror of
https://github.com/Ttanasart-pt/Pixel-Composer.git
synced 2024-12-26 06:56:45 +01:00
86 lines
2.6 KiB
GLSL
86 lines
2.6 KiB
GLSL
varying vec2 v_vTexcoord;
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varying vec4 v_vColour;
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uniform vec2 dimension;
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uniform float tolerance;
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uniform int strict;
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float d(in vec4 c1, in vec4 c2) { return length(c1.rgb * c1.a - c2.rgb * c2.a) / sqrt(3.); }
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bool s(in vec4 c1, in vec4 c2) { return d(c1, c2) <= tolerance; }
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#region select closet color
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vec4 sel2(in vec4 c, in vec4 c0, in vec4 c1) {
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float d0 = d(c, c0);
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float d1 = d(c, c1);
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float mn = min(d0, d1);
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if(mn == d0) return c0;
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return c1;
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}
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vec4 sel3(in vec4 c, in vec4 c0, in vec4 c1, in vec4 c2) {
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float d0 = d(c, c0);
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float d1 = d(c, c1);
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float d2 = d(c, c2);
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float mn = min(min(d0, d1), d2);
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if(mn == d0) return c0;
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if(mn == d1) return c1;
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return c2;
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}
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vec4 sel4(in vec4 c, in vec4 c0, in vec4 c1, in vec4 c2, in vec4 c3) {
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float d0 = d(c, c0);
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float d1 = d(c, c1);
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float d2 = d(c, c2);
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float d3 = d(c, c3);
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float mn = min(min(d0, d1), min(d2, d3));
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if(mn == d0) return c0;
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if(mn == d1) return c1;
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if(mn == d2) return c2;
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return c3;
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}
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#endregion
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void main() {
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vec2 tx = 1. / dimension;
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// 0 1 2
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// 3 4 5
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// 6 7 8
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vec4 a0 = texture2D( gm_BaseTexture, v_vTexcoord + vec2(-tx.x, -tx.y));
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vec4 a1 = texture2D( gm_BaseTexture, v_vTexcoord + vec2( 0., -tx.y));
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vec4 a2 = texture2D( gm_BaseTexture, v_vTexcoord + vec2( tx.x, -tx.y));
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vec4 a3 = texture2D( gm_BaseTexture, v_vTexcoord + vec2(-tx.x, 0.));
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vec4 a4 = texture2D( gm_BaseTexture, v_vTexcoord );
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vec4 a5 = texture2D( gm_BaseTexture, v_vTexcoord + vec2( tx.x, 0.));
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vec4 a6 = texture2D( gm_BaseTexture, v_vTexcoord + vec2(-tx.x, tx.y));
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vec4 a7 = texture2D( gm_BaseTexture, v_vTexcoord + vec2( 0., tx.y));
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vec4 a8 = texture2D( gm_BaseTexture, v_vTexcoord + vec2( tx.x, tx.y));
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gl_FragColor = a4;
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if(a4.a == 0.) return;
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if(strict == 0) {
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if(a1.a > 0. && !s(a4, a1) && s(a1, a3) && s(a1, a5)) gl_FragColor = sel3(a4, a1, a3, a5);
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if(a3.a > 0. && !s(a4, a3) && s(a3, a1) && s(a3, a7)) gl_FragColor = sel3(a4, a3, a1, a7);
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if(a5.a > 0. && !s(a4, a5) && s(a5, a1) && s(a5, a7)) gl_FragColor = sel3(a4, a5, a1, a7);
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if(a7.a > 0. && !s(a4, a7) && s(a7, a3) && s(a7, a5)) gl_FragColor = sel3(a4, a7, a3, a5);
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} else if(strict == 1) {
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if(a1.a > 0. && !s(a4, a1) && s(a1, a3) && s(a1, a5) && s(a1, a7))
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gl_FragColor = sel4(a4, a1, a3, a5, a7);
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} else if(strict == 2) {
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if(a1.a > 0. && !s(a4, a1) && s(a1, a3) && s(a1, a5) && s(a1, a7)
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&& s(a1, a0) && s(a1, a2) && s(a1, a6) && s(a1, a8)
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) gl_FragColor = sel4(a4, a1, a3, a5, a7);
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}
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}
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