49 lines
1.1 KiB
Text
49 lines
1.1 KiB
Text
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/*
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Glitch Effect Shader by Yui Kinomoto @arlez80
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MIT License
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*/
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shader_type canvas_item;
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uniform float shake_power = 0.03;
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uniform float shake_rate : hint_range( 0.0, 1.0 ) = 0.2;
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uniform float shake_speed = 5.0;
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uniform float shake_block_size = 30.5;
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uniform float shake_color_rate : hint_range( 0.0, 1.0 ) = 0.01;
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uniform sampler2D screen_texture : hint_screen_texture;
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float random( float seed )
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{
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return fract( 543.2543 * sin( dot( vec2( seed, seed ), vec2( 3525.46, -54.3415 ) ) ) );
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}
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void fragment( )
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{
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float enable_shift = float(
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random( trunc( TIME * shake_speed ) )
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< shake_rate
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);
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vec2 fixed_uv = SCREEN_UV;
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fixed_uv.x += (
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random(
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( trunc( SCREEN_UV.y * shake_block_size ) / shake_block_size )
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+ TIME
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) - 0.5
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) * shake_power * enable_shift;
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vec4 pixel_color = textureLod( screen_texture, fixed_uv, 0.0 );
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pixel_color.r = mix(
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pixel_color.r
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, textureLod( screen_texture, fixed_uv + vec2( shake_color_rate, 0.0 ), 0.0 ).r
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, enable_shift
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);
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pixel_color.b = mix(
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pixel_color.b
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, textureLod( screen_texture, fixed_uv + vec2( -shake_color_rate, 0.0 ), 0.0 ).b
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, enable_shift
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);
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COLOR = pixel_color;
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}
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