First commit desu

shaders/glsl/mfx_grain.fp

@@ -0,0 +1,51 @@
+/*
+   Complex grain shader ported over from MariENB
+   (C)2012-2018 Marisa Kirisame
+*/
+const float nf = 0.000005;
+const vec3 nm1 = vec3(2.05,3.11,2.22);
+const float nk = 0.04;
+const vec3 nm2 = vec3(4.25,9.42,6.29);
+const float ns = -0.08;
+const float np = 3.95;
+const float bnp = 1.7;
+
+#define darkmask(a,b) (a>0.5)?(2.0*a*(0.5+b)):(1.0-2.0*(1.0-a)*(1.0-((0.5+b))))
+
+vec3 grain( in vec3 res, in vec2 coord )
+{
+	float ts = Timer*nf;
+	vec2 s1 = coord+vec2(0.0,ts);
+	vec2 s2 = coord+vec2(ts,0.0);
+	vec2 s3 = coord+vec2(ts,ts);
+	float n1, n2, n3;
+	vec2 nr = textureSize(NoiseTexture,0);
+	n1 = texture(NoiseTexture,s1*nm1.x*nr).r;
+	n2 = texture(NoiseTexture,s2*nm1.y*nr).g;
+	n3 = texture(NoiseTexture,s3*nm1.z*nr).b;
+	s1 = coord+vec2(ts+n1*nk,n2*nk);
+	s2 = coord+vec2(n2,ts+n3*nk);
+	s3 = coord+vec2(ts+n3*nk,ts+n1*nk);
+	n1 = texture(NoiseTexture,s1*nm2.x*nr).r;
+	n2 = texture(NoiseTexture,s2*nm2.y*nr).g;
+	n3 = texture(NoiseTexture,s3*nm2.z*nr).b;
+	float n4 = (n1+n2+n3)/3.0;
+	vec3 ng = vec3(n4);
+	vec3 nc = vec3(n1,n2,n3);
+	vec3 nt = pow(clamp(mix(ng,nc,ns),0.0,1.0),vec3(np));
+	float bn = 1.0-clamp((res.r+res.g+res.b)/3.0,0.0,1.0);
+	bn = pow(bn,bnp);
+	vec3 nn = clamp(nt*bn,vec3(0.0),vec3(1.0));
+	res.r = darkmask(res.r,(nn.r*ni));
+	res.g = darkmask(res.g,(nn.g*ni));
+	res.b = darkmask(res.b,(nn.b*ni));
+	return res;
+}
+
+void main()
+{
+	vec2 coord = TexCoord;
+	vec4 res = texture(InputTexture,coord);
+	res.rgb = grain(res.rgb,coord);
+	FragColor = res;
+}