22 lines
915 B
GLSL
22 lines
915 B
GLSL
#version 150
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uniform vec2 dt;
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uniform vec4 selected, color;
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uniform sampler2D t0;
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uniform float fill;
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void main(void) {
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ivec2 tc = ivec2(gl_FragCoord.xy);
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vec4 ds0 = abs(texelFetchOffset(t0, tc, 0, ivec2(-1, 0)) - selected);
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vec4 ds1 = abs(texelFetchOffset(t0, tc, 0, ivec2( 1, 0)) - selected);
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vec4 ds2 = abs(texelFetchOffset(t0, tc, 0, ivec2(0, -1)) - selected);
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vec4 ds3 = abs(texelFetchOffset(t0, tc, 0, ivec2(0, 1)) - selected);
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float d0 = dot(ds0, vec4(1., 1., 1., 1.)), d1 = dot(ds1, vec4(1., 1., 1., 1.)), d2 = dot(ds2, vec4(1., 1., 1., 1.)), d3 = dot(ds3, vec4(1., 1., 1., 1.));
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float vs = step(1e-6, d0 + d1 + d2 + d3);
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float vm = step(1e-3, (d0 * 25.) * (d1 * 25.) * (d2 * 255.) * (d3 * 255.));
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float v = mix(vs - vm, vs - vm - vm + 1, fill);
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//qgl_FragData[0] = vec4(1,0,0,0.5);//vec4(color.rgb, v * color.a);
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gl_FragColor = v*vec4(color.bgr, v * color.a);
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//qgl_FragData[0] = vec4(1);
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}
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