Lubos Lenco
59 lines
1.3 KiB
GLSL
59 lines
1.3 KiB
GLSL
#version 450
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uniform sampler2D tex;
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uniform sampler2D texdilate;
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uniform float dilateRadius;
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in vec2 texCoord;
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out vec4 fragColor;
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const vec2 offsets[8] = vec2[] (
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vec2(-1, 0),
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vec2( 1, 0),
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vec2( 0, 1),
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vec2( 0,-1),
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vec2(-1, 1),
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vec2( 1, 1),
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vec2( 1,-1),
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vec2(-1,-1)
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);
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void main() {
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// Based on https://shaderbits.com/blog/uv-dilation by Ryan Brucks
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vec2 size = textureSize(tex, 0).xy;
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vec2 texelSize = 1.0 / size;
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float minDist = 10000000;
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ivec2 coord = ivec2(texCoord * size);
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float mask = texelFetch(texdilate, coord, 0).r;
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if (mask > 0) discard;
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fragColor = texelFetch(tex, coord, 0);
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int i = 0;
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while (i < dilateRadius) {
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i++;
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int j = 0;
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while (j < 8) {
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vec2 curUV = texCoord + offsets[j] * texelSize * i;
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coord = ivec2(curUV * size);
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float offsetMask = texelFetch(texdilate, coord, 0).r;
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vec4 offsetCol = texelFetch(tex, coord, 0);
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if (offsetMask != 0) {
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float curDist = length(texCoord - curUV);
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if (curDist < minDist) {
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vec2 projectUV = curUV + offsets[j] * texelSize * i * 0.25;
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vec4 direction = textureLod(tex, projectUV, 0.0);
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minDist = curDist;
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if (direction.x != 0 || direction.y != 0 || direction.z != 0) {
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vec4 delta = offsetCol - direction;
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fragColor = offsetCol + delta * 4;
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}
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else {
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fragColor = offsetCol;
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}
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}
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}
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j++;
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}
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}
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}
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