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30 lines
682 B
GLSL
30 lines
682 B
GLSL
// Scanline shader
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// Author: Themaister
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// This code is hereby placed in the public domain.
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#ifdef GL_FRAGMENT_PRECISION_HIGH
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precision highp float;
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#else
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precision mediump float;
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#endif
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uniform sampler2D sampler0;
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uniform vec2 u_texelDelta;
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in vec2 r_texcoord;
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out vec4 o_color;
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const float base_brightness = 0.95;
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const vec2 sine_comp = vec2(0.05, 0.15);
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#define pi 3.141592654
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void main () {
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vec4 c11 = texture(sampler0, r_texcoord);
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vec2 omega = vec2(pi / u_texelDelta.x, 2.0 * pi / u_texelDelta.x);
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vec4 scanline = c11 * (base_brightness + dot(sine_comp * sin(r_texcoord * omega), vec2(1.0)));
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o_color = clamp(scanline, 0.0, 1.0);
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}
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