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33 lines
1.4 KiB
33 lines
1.4 KiB
6 years ago
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uniform sampler2D texture;
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uniform float edge_threshold;
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void main()
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{
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const float offset = 1.0 / 512.0;
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vec2 offx = vec2(offset, 0.0);
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vec2 offy = vec2(0.0, offset);
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vec4 hEdge = texture2D(texture, gl_TexCoord[0].xy - offy) * -2.0 +
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texture2D(texture, gl_TexCoord[0].xy + offy) * 2.0 +
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texture2D(texture, gl_TexCoord[0].xy - offx - offy) * -1.0 +
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texture2D(texture, gl_TexCoord[0].xy - offx + offy) * 1.0 +
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texture2D(texture, gl_TexCoord[0].xy + offx - offy) * -1.0 +
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texture2D(texture, gl_TexCoord[0].xy + offx + offy) * 1.0;
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vec4 vEdge = texture2D(texture, gl_TexCoord[0].xy - offx) * 2.0 +
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texture2D(texture, gl_TexCoord[0].xy + offx) * -2.0 +
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texture2D(texture, gl_TexCoord[0].xy - offx - offy) * 1.0 +
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texture2D(texture, gl_TexCoord[0].xy - offx + offy) * -1.0 +
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texture2D(texture, gl_TexCoord[0].xy + offx - offy) * 1.0 +
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texture2D(texture, gl_TexCoord[0].xy + offx + offy) * -1.0;
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vec3 result = sqrt(hEdge.rgb * hEdge.rgb + vEdge.rgb * vEdge.rgb);
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float edge = length(result);
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vec4 pixel = gl_Color * texture2D(texture, gl_TexCoord[0].xy);
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if (edge > (edge_threshold * 8.0))
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pixel.rgb = vec3(0.0, 0.0, 0.0);
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else
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pixel.a = edge_threshold;
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gl_FragColor = pixel;
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}
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