146 lines
4.0 KiB
GLSL
146 lines
4.0 KiB
GLSL
uniform vec3 iResolution; // viewport resolution (in pixels)
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uniform float iTime; // shader playback time (in seconds)
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uniform vec4 iMouse;
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#define time iTime
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mat2 mm2(in float a){float c = cos(a), s = sin(a);return mat2(c,s,-s,c);}
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mat2 m2 = mat2(0.95534, 0.29552, -0.29552, 0.95534);
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float tri(in float x){return clamp(abs(fract(x)-.5),0.01,0.49);}
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vec2 tri2(in vec2 p){return vec2(tri(p.x)+tri(p.y),tri(p.y+tri(p.x)));}
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float triNoise2d(in vec2 p, float spd)
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{
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float z=1.8;
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float z2=2.5;
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float rz = 0.;
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p *= mm2(p.x*0.06);
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vec2 bp = p;
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for (float i=0.; i<5.; i++ )
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{
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vec2 dg = tri2(bp*1.85)*.75;
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dg *= mm2(time*spd);
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p -= dg/z2;
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bp *= 1.3;
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z2 *= .45;
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z *= .42;
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p *= 1.21 + (rz-1.0)*.02;
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rz += tri(p.x+tri(p.y))*z;
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p*= -m2;
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}
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return clamp(1./pow(rz*29., 1.3),0.,.55);
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}
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float hash21(in vec2 n){ return fract(sin(dot(n, vec2(12.9898, 4.1414))) * 43758.5453); }
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vec4 aurora(vec3 ro, vec3 rd)
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{
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vec4 col = vec4(0);
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vec4 avgCol = vec4(0);
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for(float i=0.;i<50.;i++)
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{
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float of = 0.006*hash21(gl_FragCoord.xy)*smoothstep(0.,15., i);
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float pt = ((.8+pow(i,1.4)*.002)-ro.y)/(rd.y*2.+0.4);
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pt -= of;
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vec3 bpos = ro + pt*rd;
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vec2 p = bpos.zx;
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float rzt = triNoise2d(p, 0.06);
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vec4 col2 = vec4(0,0,0, rzt);
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col2.rgb = (sin(1.-vec3(2.15,-.5, 1.2)+i*0.043)*0.5+0.5)*rzt;
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avgCol = mix(avgCol, col2, .5);
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col += avgCol*exp2(-i*0.065 - 2.5)*smoothstep(0.,5., i);
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}
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col *= (clamp(rd.y*15.+.4,0.,1.));
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//return clamp(pow(col,vec4(1.3))*1.5,0.,1.);
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//return clamp(pow(col,vec4(1.7))*2.,0.,1.);
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//return clamp(pow(col,vec4(1.5))*2.5,0.,1.);
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//return clamp(pow(col,vec4(1.8))*1.5,0.,1.);
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//return smoothstep(0.,1.1,pow(col,vec4(1.))*1.5);
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return col*1.8;
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//return pow(col,vec4(1.))*2.
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}
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//-------------------Background and Stars--------------------
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vec3 nmzHash33(vec3 q)
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{
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uvec3 p = uvec3(ivec3(q));
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p = p*uvec3(374761393U, 1103515245U, 668265263U) + p.zxy + p.yzx;
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p = p.yzx*(p.zxy^(p >> 3U));
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return vec3(p^(p >> 16U))*(1.0/vec3(0xffffffffU));
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}
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vec3 stars(in vec3 p)
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{
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vec3 c = vec3(0.);
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float res = iResolution.x*1.;
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for (float i=0.;i<4.;i++)
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{
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vec3 q = fract(p*(.15*res))-0.5;
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vec3 id = floor(p*(.15*res));
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vec2 rn = nmzHash33(id).xy;
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float c2 = 1.-smoothstep(0.,.6,length(q));
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c2 *= step(rn.x,.0005+i*i*0.001);
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c += c2*(mix(vec3(1.0,0.49,0.1),vec3(0.75,0.9,1.),rn.y)*0.1+0.9);
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p *= 1.3;
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}
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return c*c*.8;
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}
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vec3 bg(in vec3 rd)
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{
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float sd = dot(normalize(vec3(-0.5, -0.6, 0.9)), rd)*0.5+0.5;
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sd = pow(sd, 5.);
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vec3 col = mix(vec3(0.05,0.1,0.2), vec3(0.1,0.05,0.2), sd);
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return col*.63;
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}
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//-----------------------------------------------------------
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void main()
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{
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vec2 q = gl_FragCoord.xy / iResolution.xy;
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vec2 p = q - 0.5;
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p.x*=iResolution.x/iResolution.y;
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vec3 ro = vec3(0,0,-6.7);
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vec3 rd = normalize(vec3(p,1.3));
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vec2 mo = iMouse.xy / iResolution.xy-.5;
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mo = (mo==vec2(-.5))?mo=vec2(-0.1,0.1):mo;
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mo.x *= iResolution.x/iResolution.y;
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rd.yz *= mm2(mo.y);
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rd.xz *= mm2(mo.x + sin(time*0.05)*0.2);
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vec3 col = vec3(0.);
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vec3 brd = rd;
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float fade = smoothstep(0.,0.01,abs(brd.y))*0.1+0.9;
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col = bg(rd)*fade;
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if (rd.y > 0.){
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vec4 aur = smoothstep(0.,1.5,aurora(ro,rd))*fade;
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col += stars(rd);
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col = col*(1.-aur.a) + aur.rgb;
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}
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else //Reflections
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{
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rd.y = abs(rd.y);
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col = bg(rd)*fade*0.6;
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vec4 aur = smoothstep(0.0,2.5,aurora(ro,rd));
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col += stars(rd)*0.1;
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col = col*(1.-aur.a) + aur.rgb;
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vec3 pos = ro + ((0.5-ro.y)/rd.y)*rd;
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float nz2 = triNoise2d(pos.xz*vec2(.5,.7), 0.);
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col += mix(vec3(0.2,0.25,0.5)*0.08,vec3(0.3,0.3,0.5)*0.7, nz2*0.4);
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}
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gl_FragColor = vec4(col, 1.);
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} |