100 lines
2.7 KiB
GLSL
100 lines
2.7 KiB
GLSL
// animated DEMOLITIONIST logo
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#define PI 3.14159265
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vec2 warpcoord( in vec2 uv )
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{
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vec2 offset;
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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 uv+offset;
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}
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float hardlight( in float a, in float b )
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{
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if ( 2.*a < 1. ) return clamp(2.*a*b,0.,1.);
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return clamp(1.-2.*(1.-b)*(1.-a),0.,1.);
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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 alpha = 0.;
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float a;
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a = clamp(dst.r,0.,1.);
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if ( a > alpha ) alpha = a;
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a = clamp(dst.g,0.,1.);
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if ( a > alpha ) alpha = a;
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a = clamp(dst.b,0.,1.);
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if ( a > alpha ) alpha = a;
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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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vec4 BilinearSample( in sampler2D tex, in vec2 pos, in vec2 size, in vec2 pxsize )
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{
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vec2 f = fract(pos*size);
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pos += (.5-f)*pxsize;
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vec4 p0q0 = texture(tex,pos);
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vec4 p1q0 = texture(tex,pos+vec2(pxsize.x,0));
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vec4 p0q1 = texture(tex,pos+vec2(0,pxsize.y));
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vec4 p1q1 = texture(tex,pos+vec2(pxsize.x,pxsize.y));
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vec4 pInterp_q0 = mix(p0q0,p1q0,f.x);
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vec4 pInterp_q1 = mix(p0q1,p1q1,f.x);
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return mix(pInterp_q0,pInterp_q1,f.y);
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}
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vec3 GradientMap( in vec3 color )
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{
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float gray = dot(color,vec3(.333333));
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vec2 size = vec2(512.,8.);
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vec2 pxsize = 1./size;
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return BilinearSample(gradtex,vec2(gray/2.+.25,0.),size,pxsize).rgb;
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}
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void SetupMaterial( inout Material mat )
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{
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// store these to save some time
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vec2 size = vec2(textureSize(Layer1,0));
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vec2 pxsize = 1./size;
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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
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vec4 base = vec4(1.);
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// first layer, warp then multiply red
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base.rgb *= BilinearSample(Layer1,warpcoord(uv),size,pxsize).x;
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// first layer, multiply green
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base.rgb *= BilinearSample(Layer1,uv,size,pxsize).y;
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// first layer, add blue
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base.rgb += BilinearSample(Layer1,uv,size,pxsize).zzz;
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// multiply by red fade
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base.rgb *= texture(fadetex,vec2(.5)).x;
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// gradient map result
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base.rgb = GradientMap(base.rgb);
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// color to alpha
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base = blacktoalpha(base);
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// second layer, alpha blend
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vec4 tmp = BilinearSample(Layer2,uv,size,pxsize);
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vec4 tmp2;
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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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base = tmp2;
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// third layer, hard light with two multiplied masks
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tmp.xy = BilinearSample(Layer3,uv,size,pxsize).xy;
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tmp.z = texture(fadetex,vec2(.5)).y;
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tmp.y *= BilinearSample(Layer3,clamp(uv+vec2(1.-tmp.z*2.,0.),vec2(0.),vec2(1.)),size,pxsize).z;
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tmp2.r = hardlight(base.r,tmp.x);
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tmp2.g = hardlight(base.g,tmp.x);
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tmp2.b = hardlight(base.b,tmp.x);
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base.rgb = mix(base.rgb,tmp2.rgb,tmp.y);
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// clamp
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base = clamp(base,vec4(0.),vec4(1.));
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// ding, logo's done
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mat.Base = base;
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}
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