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Improves scanlines fragment shader

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This commit is contained in:
danyalzia 2013-10-22 21:18:53 +05:00
parent 62685b6145
commit 125c4a8ec2
1 changed files with 13 additions and 4 deletions
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17
assets/shaders/scanlines.fsh
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@ -1,5 +1,4 @@
// Simple Scanlines shader, created to use in PPSSPP.
// Looks good at Internal resolution same as viewport.
// Advanced Scanlines (CRT) shader, created to use in PPSSPP.
#ifdef GL_ES
precision mediump float;
@ -15,8 +14,18 @@ float frequency = 166.0;
void main()
{
float pos0 = (v_texcoord0.y + offset) * frequency;
float pos1 = cos((fract( pos0 ) - 0.5)*3.14159);
float pos1 = cos((fract( pos0 ) - 0.5)*3.1415926);
vec4 pel = texture2D( sampler0, v_texcoord0 );
// slight contrast curve
vec4 color = pel*0.5+0.5*pel*pel*1.2;
color *= 2.0;
// color tint
color *= vec4(0.9,1.0,0.7, 0.0);
// vignette
color *= 1.1 - 0.6 * (dot(v_texcoord0 - 0.5, v_texcoord0 - 0.5) * 2.0);
gl_FragColor = mix(vec4(0,0,0,0), pel, pos1);
gl_FragColor.rgba = mix(vec4(0,0,0,0), color, pos1);
}