14 lines
329 B
GLSL
14 lines
329 B
GLSL
uniform float amount; /// min:0 set:0.10 max:0.5
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void mainImage( out vec4 fragColor, in vec2 fragCoord ) {
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vec2 uv = fragCoord.xy / iResolution.xy;
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// letterbox
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if( uv.y < amount || (1.0-uv.y) < amount ) {
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fragColor = vec4( 0., 0., 0., 1. );
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return;
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}
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fragColor = texture(iChannel0, uv);
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}
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