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Shader cleanup - applies DRY to various shaders in the game (#23294)

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shader cleanup - applies DRY to various shaders in the game
This commit is contained in:
deathride58
2024-01-03 03:35:25 -05:00
committed by GitHub
parent 0e18d54cf7
commit ef1cba70b3
6 changed files with 15 additions and 82 deletions
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28
Resources/Textures/Shaders/paperstamp.swsl
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@@ -3,30 +3,6 @@
// affected by the widget layout/position.
uniform highp vec2 objCoord;
// Magic, well-known 2d random function; makes perlin-like noise
highp vec2 random(highp vec2 uv){
uv = vec2( dot(uv, vec2(127.1,311.7) ),
dot(uv, vec2(269.5,183.3) ) );
return -1.0 + 2.0 * fract(sin(uv) * 43758.5453123);
}
highp float noise(highp vec2 uv) {
highp vec2 uv_i = floor(uv);
highp vec2 uv_f = fract(uv);
highp vec2 t = smoothstep(0.0, 1.0, uv_f);
// Sample the random function and run a bilinear filter to smooth it out
highp float tl = dot( random(uv_i + vec2(0.0,0.0) ), uv_f - vec2(0.0,0.0) );
highp float tr = dot( random(uv_i + vec2(1.0,0.0) ), uv_f - vec2(1.0,0.0) );
highp float bl = dot( random(uv_i + vec2(0.0,1.0) ), uv_f - vec2(0.0,1.0) );
highp float br = dot( random(uv_i + vec2(1.0,1.0) ), uv_f - vec2(1.0,1.0) );
highp float tA = mix( tl, tr, t.x );
highp float tB = mix( bl, br, t.x );
return mix( tA, tB, t.y ) + 0.5;
}
void fragment() {
// Stamps have orientation, and the texture sampling is nearest
// pixel, so run a bilinear filter to smooth out the edges.
@@ -45,8 +21,8 @@ void fragment() {
// Add a bit of noise to mimic imperfect contact with the paper
{
highp float stampNoise = noise((FRAGCOORD.xy - objCoord) * vec2(0.03, 0.03)) *
noise((FRAGCOORD.xy - objCoord) * vec2(0.08, 0.08));
highp float stampNoise = zNoise((FRAGCOORD.xy - objCoord) * vec2(0.03, 0.03)) *
zNoise((FRAGCOORD.xy - objCoord) * vec2(0.08, 0.08));
COLOR.a *= min(0.9, 0.4 + smoothstep(0.05, 0.3, stampNoise));
}
}