forked from goliath/shadermeh
159 lines
6.0 KiB
GLSL
159 lines
6.0 KiB
GLSL
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float sun(vec2 uv, float battery)
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{
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float val = smoothstep(0.3, 0.29, length(uv));
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float bloom = smoothstep(0.7, 0.0, length(uv));
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float cut = 3.0 * sin((uv.y + iTime * 0.2 * (battery + 0.02)) * 100.0)
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+ clamp(uv.y * 14.0 + 1.0, -6.0, 6.0);
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cut = clamp(cut, 0.0, 1.0);
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return clamp(val * cut, 0.0, 1.0) + bloom * 0.6;
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}
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float grid(vec2 uv, float battery)
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{
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vec2 size = vec2(uv.y, uv.y * uv.y * 0.2) * 0.01;
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uv += vec2(0.0, iTime * 4.0 * (battery + 0.05));
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uv = abs(fract(uv) - 0.5);
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vec2 lines = smoothstep(size, vec2(0.0), uv);
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lines += smoothstep(size * 5.0, vec2(0.0), uv) * 0.4 * battery;
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return clamp(lines.x + lines.y, 0.0, 3.0);
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}
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float dot2(in vec2 v ) { return dot(v,v); }
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float sdTrapezoid( in vec2 p, in float r1, float r2, float he )
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{
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vec2 k1 = vec2(r2,he);
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vec2 k2 = vec2(r2-r1,2.0*he);
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p.x = abs(p.x);
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vec2 ca = vec2(p.x-min(p.x,(p.y<0.0)?r1:r2), abs(p.y)-he);
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vec2 cb = p - k1 + k2*clamp( dot(k1-p,k2)/dot2(k2), 0.0, 1.0 );
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float s = (cb.x<0.0 && ca.y<0.0) ? -1.0 : 1.0;
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return s*sqrt( min(dot2(ca),dot2(cb)) );
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}
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float sdLine( in vec2 p, in vec2 a, in vec2 b )
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{
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vec2 pa = p-a, ba = b-a;
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float h = clamp( dot(pa,ba)/dot(ba,ba), 0.0, 1.0 );
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return length( pa - ba*h );
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}
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float sdBox( in vec2 p, in vec2 b )
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{
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vec2 d = abs(p)-b;
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return length(max(d,vec2(0))) + min(max(d.x,d.y),0.0);
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}
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float opSmoothUnion(float d1, float d2, float k){
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float h = clamp(0.5 + 0.5 * (d2 - d1) /k,0.0,1.0);
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return mix(d2, d1 , h) - k * h * ( 1.0 - h);
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}
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float sdCloud(in vec2 p, in vec2 a1, in vec2 b1, in vec2 a2, in vec2 b2, float w)
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{
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//float lineVal1 = smoothstep(w - 0.0001, w, sdLine(p, a1, b1));
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float lineVal1 = sdLine(p, a1, b1);
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float lineVal2 = sdLine(p, a2, b2);
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vec2 ww = vec2(w*1.5, 0.0);
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vec2 left = max(a1 + ww, a2 + ww);
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vec2 right = min(b1 - ww, b2 - ww);
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vec2 boxCenter = (left + right) * 0.5;
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//float boxW = right.x - left.x;
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float boxH = abs(a2.y - a1.y) * 0.5;
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//float boxVal = sdBox(p - boxCenter, vec2(boxW, boxH)) + w;
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float boxVal = sdBox(p - boxCenter, vec2(0.04, boxH)) + w;
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float uniVal1 = opSmoothUnion(lineVal1, boxVal, 0.05);
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float uniVal2 = opSmoothUnion(lineVal2, boxVal, 0.05);
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return min(uniVal1, uniVal2);
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}
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void mainImage( out vec4 fragColor, in vec2 fragCoord )
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{
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vec2 uv = (2.0 * fragCoord.xy - iResolution.xy)/iResolution.y;
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float battery = 1.0;
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//if (iMouse.x > 1.0 && iMouse.y > 1.0) battery = iMouse.y / iResolution.y;
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//else battery = 0.8;
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//if (abs(uv.x) < (9.0 / 16.0))
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{
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// Grid
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float fog = smoothstep(0.1, -0.02, abs(uv.y + 0.2));
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vec3 col = vec3(0.0, 0.1, 0.2);
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if (uv.y < -0.2)
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{
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uv.y = 3.0 / (abs(uv.y + 0.2) + 0.05);
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uv.x *= uv.y * 1.0;
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float gridVal = grid(uv, battery);
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col = mix(col, vec3(1.0, 0.5, 1.0), gridVal);
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}
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else
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{
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float fujiD = min(uv.y * 4.5 - 0.5, 1.0);
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uv.y -= battery * 1.1 - 0.51;
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vec2 sunUV = uv;
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vec2 fujiUV = uv;
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// Sun
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sunUV += vec2(0.75, 0.2);
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//uv.y -= 1.1 - 0.51;
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col = vec3(1.0, 0.2, 1.0);
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float sunVal = sun(sunUV, battery);
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col = mix(col, vec3(1.0, 0.4, 0.1), sunUV.y * 2.0 + 0.2);
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col = mix(vec3(0.0, 0.0, 0.0), col, sunVal);
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// fuji
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float fujiVal = sdTrapezoid( uv + vec2(-0.75+sunUV.y * 0.0, 0.5), 1.75 + pow(uv.y * uv.y, 2.1), 0.2, 0.5);
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float waveVal = uv.y + sin(uv.x * 20.0 + iTime * 2.0) * 0.05 + 0.2;
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float wave_width = smoothstep(0.0,0.01,(waveVal));
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// fuji color
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col = mix( col, mix(vec3(0.0, 0.0, 0.25), vec3(1.0, 0.0, 0.5), fujiD), step(fujiVal, 0.0));
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// fuji top snow
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col = mix( col, vec3(1.0, 0.5, 1.0), wave_width * step(fujiVal, 0.0));
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// fuji outline
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col = mix( col, vec3(1.0, 0.5, 1.0), 1.0-smoothstep(0.0,0.01,abs(fujiVal)) );
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//col = mix( col, vec3(1.0, 1.0, 1.0), 1.0-smoothstep(0.03,0.04,abs(fujiVal)) );
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//col = vec3(1.0, 1.0, 1.0) *(1.0-smoothstep(0.03,0.04,abs(fujiVal)));
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// horizon color
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col += mix( col, mix(vec3(1.0, 0.12, 0.8), vec3(0.0, 0.0, 0.2), clamp(uv.y * 3.5 + 3.0, 0.0, 1.0)), step(0.0, fujiVal) );
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// cloud
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vec2 cloudUV = uv;
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cloudUV.x = mod(cloudUV.x + iTime * 0.1, 4.0) - 2.0;
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float cloudTime = iTime * 0.5;
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float cloudY = -0.5;
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float cloudVal1 = sdCloud(cloudUV,
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vec2(0.1 + sin(cloudTime + 140.5)*0.1,cloudY),
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vec2(1.05 + cos(cloudTime * 0.9 - 36.56) * 0.1, cloudY),
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vec2(0.2 + cos(cloudTime * 0.867 + 387.165) * 0.1,0.25+cloudY),
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vec2(0.5 + cos(cloudTime * 0.9675 - 15.162) * 0.09, 0.25+cloudY), 0.075);
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cloudY = -0.6;
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float cloudVal2 = sdCloud(cloudUV,
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vec2(-0.9 + cos(cloudTime * 1.02 + 541.75) * 0.1,cloudY),
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vec2(-0.5 + sin(cloudTime * 0.9 - 316.56) * 0.1, cloudY),
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vec2(-1.5 + cos(cloudTime * 0.867 + 37.165) * 0.1,0.25+cloudY),
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vec2(-0.6 + sin(cloudTime * 0.9675 + 665.162) * 0.09, 0.25+cloudY), 0.075);
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float cloudVal = min(cloudVal1, cloudVal2);
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//col = mix(col, vec3(1.0,1.0,0.0), smoothstep(0.0751, 0.075, cloudVal));
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col = mix(col, vec3(0.0, 0.0, 0.2), 1.0 - smoothstep(0.075 - 0.0001, 0.075, cloudVal));
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col += vec3(1.0, 1.0, 1.0)*(1.0 - smoothstep(0.0,0.01,abs(cloudVal - 0.075)));
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}
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col += fog * fog * fog;
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col = mix(vec3(col.r, col.r, col.r) * 0.5, col, battery * 0.7);
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fragColor = vec4(col,1.0);
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}
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//else fragColor = vec4(0.0);
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}
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