39 lines
1.1 KiB
GLSL
39 lines
1.1 KiB
GLSL
[[vertex]]
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uniform mat4 mvp;
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in vec4 pos;
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in vec2 uvs;
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out vec2 uv;
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void main()
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{
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uv = uvs;
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gl_Position = mvp * vec4(pos.xyz, 1.0);
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}
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[[fragment]]
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uniform sampler2D tex;
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uniform mediump vec4 col;
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in mediump vec2 uv;
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out mediump vec4 frag;
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void main()
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{
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mediump float stroke = 1.0 - texture(tex, uv).r;
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int zero_count = 0;
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if (textureOffset(tex, uv, ivec2(-1, -1)).r > 0.99) zero_count++;
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if (textureOffset(tex, uv, ivec2(-1, 0)).r > 0.99) zero_count++;
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if (textureOffset(tex, uv, ivec2(-1, +1)).r > 0.99) zero_count++;
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if (textureOffset(tex, uv, ivec2( 0, -1)).r > 0.99) zero_count++;
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if (textureOffset(tex, uv, ivec2( 0, 0)).r > 0.99) zero_count++;
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if (textureOffset(tex, uv, ivec2( 0, +1)).r > 0.99) zero_count++;
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if (textureOffset(tex, uv, ivec2(+1, -1)).r > 0.99) zero_count++;
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if (textureOffset(tex, uv, ivec2(+1, 0)).r > 0.99) zero_count++;
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if (textureOffset(tex, uv, ivec2(+1, +1)).r > 0.99) zero_count++;
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mediump float edge = (zero_count > 1 && zero_count < 9) ? 0.75 : 0.0;
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frag = vec4(col.rgb, edge * (1.0 - float(zero_count) / 9.f));
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}
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