93 lines
2.3 KiB
GLSL
93 lines
2.3 KiB
GLSL
#define overlay(a,b) (a<0.5)?(2.0*a*b):(1.0-(2.0*(1.0-a)*(1.0-b)))
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const float pi = 3.14159265358979323846;
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vec2 warpcoord( in vec2 uv )
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{
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vec2 offset = vec2(0,0);
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offset.y = sin(pi*2.*(uv.x*8.+timer*.25))*.005;
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offset.x = cos(pi*2.*(uv.y*4.+timer*.25))*.005;
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return fract(uv+offset);
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}
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// based on gimp color to alpha, but simplified
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vec4 blacktoalpha( in vec4 src )
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{
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vec4 dst = src;
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float dist = 0., alpha = 0.;
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float d, a;
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a = clamp(dst.r,0.,1.);
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if ( a > alpha )
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{
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alpha = a;
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dist = d;
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}
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a = clamp(dst.g,0.,1.);
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if ( a > alpha )
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{
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alpha = a;
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dist = d;
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}
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a = clamp(dst.b,0.,1.);
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if ( a > alpha )
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{
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alpha = a;
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dist = d;
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}
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if ( alpha > 0. )
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{
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float ainv = 1./alpha;
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dst.rgb *= ainv;
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}
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dst.a *= alpha;
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return dst;
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}
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void SetupMaterial( inout Material mat )
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{
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// y'all ready for this multilayered madness?
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vec2 uv = vTexCoord.st;
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// base blank layer, copy
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vec4 base = texture(LogoTex,uv*vec2(.5,.25));
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// first layer, blend
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vec4 tmp = texture(LogoTex,uv*vec2(.5,.25)+vec2(0.,.25));
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base.rgb = mix(base.rgb,tmp.rgb,tmp.a);
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// second layer, warp then add
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tmp = texture(LogoTex,warpcoord(uv)*vec2(.5,.25)+vec2(0.,.5));
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base.rgb += tmp.rgb;
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// third layer, multiply
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tmp = texture(LogoTex,uv*vec2(.5,.25)+vec2(0.,.75));
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base.rgb *= tmp.rgb;
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// fourth layer, add
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tmp = texture(LogoTex,uv*vec2(.5,.25)+vec2(.5,0.));
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base.rgb += tmp.rgb;
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// fifth layer, add
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tmp = texture(LogoTex,uv*vec2(.5,.25)+vec2(.5,.25));
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base.rgb += tmp.rgb;
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// sixth layer, overlay (w/ alpha blend)
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tmp = texture(LogoTex,uv*vec2(.5,.25)+vec2(.5,.5));
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vec4 tmp2;
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tmp2.r = overlay(base.r,tmp.r);
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tmp2.g = overlay(base.g,tmp.g);
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tmp2.b = overlay(base.b,tmp.b);
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base.rgb = mix(base.rgb,tmp2.rgb,tmp.a);
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// black to alpha
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base = blacktoalpha(base);
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// add alpha of first layer
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tmp = texture(LogoTex,uv*vec2(.5,.25)+vec2(0.,.25));
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base.a += tmp.a;
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// clamp
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base = clamp(base,0.,1.);
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// seventh layer, alpha blend
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tmp = texture(LogoTex,uv*vec2(.5,.25)+vec2(.5,.75));
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tmp2.a = tmp.a+base.a*(1-tmp.a);
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tmp2.rgb = (tmp.rgb*tmp.a+base.rgb*base.a*(1-tmp.a))/tmp2.a;
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if ( tmp2.a == 0. ) tmp2.rgb = vec3(0.);
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// clamp borders
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vec2 sz = vec2(256,128);
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vec2 px = uv*sz;
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if ( (px.x <= 1) || (px.x >= (sz.x-1)) || (px.y <= 1) || (px.y >= (sz.y-1)) )
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tmp2 = vec4(0.);
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// ding, logo's done
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mat.Base = tmp2;
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}
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