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make res-independent scanlines a little thinner and adjustable brightness

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hunterk 2019-12-18 16:21:01 -06:00
parent 492951eb55
commit b778a6b7cb
1 changed files with 8 additions and 3 deletions
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11
scanlines/shaders/res-independent-scanlines.slang
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@ -1,5 +1,11 @@
#version 450
/*
based on scanline shader by:
Author: Themaister
License: Public domain
*/
layout(push_constant) uniform Push
{
vec4 SourceSize;
@ -48,8 +54,7 @@ void main()
{
vec2 sine_comp = vec2(0.0, SCANLINE_SINE_COMP_B);
vec3 res = texture(Source, vTexCoord).xyz;
vec2 fragcoord = vTexCoord.xy * params.FinalViewportSize.xy;
// picked 224 here as a magic number because it's a common 240p res and therefore a good starting point
vec3 scanline = res * ((1. - 0.75 * SCANLINE_SINE_COMP_B) + dot(sine_comp * sin((fragcoord / (224. * scanline_size)) * omega), vec2(1.0, 1.0)));
vec2 fragcoord = fract(floor(vTexCoord.xy * params.OutputSize.xy * 1.0001) / scanline_size);
vec3 scanline = (fragcoord.y > 0.3333)? res : vec3(SCANLINE_SINE_COMP_B * res);//res * ((1. - 0.75 * SCANLINE_SINE_COMP_B) + dot(sine_comp * sin((fragcoord / scanline_size) * omega), vec2(1.0, 1.0)));
FragColor = vec4(scanline.x, scanline.y, scanline.z, 1.0);
}