14 lines
276 B
GLSL
14 lines
276 B
GLSL
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uniform sampler2D tex;
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uniform float low;
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void main()
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{
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vec3 weights = vec3(0.2126, 0.7152, 0.0722); // ITU-R BT. 709
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vec3 col = texture2D(tex, gl_TexCoord[0].xy).xyz;
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float luma = dot(weights, col);
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col *= smoothstep(low, 0.9, luma);
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gl_FragColor = vec4(col, 1.0);
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}
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