Подводное солнце на HTML5 Canvas
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<div id="container" style="position:fixed;"></div> <script src="/js/three.min.js"></script> <script id="vertexShader" type="x-shader/x-vertex"> void main() { gl_Position = vec4( position, 1.0 ); } </script> <script id="fragmentShader" type="x-shader/x-fragment"> uniform vec2 u_resolution; uniform float u_time; const float NOISE_SIZE = 3.; // The size of the noise. Essentially the multiplier for the noise UV. Smaller = bigger const float INTENSITY = 20.; // The intensity of the displacement const float REFLECTION_INTENSITY = 4.; // The intensity of the rellowish reflections. const int octaves = 2; // the number of octaves to generate in the FBM noise const float seed = 43758.5453123; // A random seed :) /* Underwater Sun Liam Egan - 2018 ---------------------- A basic rippling pattern distorted by a very light amount of FBM noise. Many many thanks to Inigo Quilez, Patricio Gonzalez Vivo, Gary Warne, and many many others. "Nanos gigantum humeris insidentes" */ vec2 random2(vec2 st, float seed){ st = vec2( dot(st,vec2(127.1,311.7)), dot(st,vec2(269.5,183.3)) ); return -1.0 + 2.0*fract(sin(st)*seed); } // Value Noise by Inigo Quilez - iq/2013 // https://www.shadertoy.com/view/lsf3WH float noise(vec2 st, float seed) { vec2 i = floor(st); vec2 f = fract(st); vec2 u = f*f*(3.0-2.0*f); return mix( mix( dot( random2(i + vec2(0.0,0.0), seed ), f - vec2(0.0,0.0) ), dot( random2(i + vec2(1.0,0.0), seed ), f - vec2(1.0,0.0) ), u.x), mix( dot( random2(i + vec2(0.0,1.0), seed ), f - vec2(0.0,1.0) ), dot( random2(i + vec2(1.0,1.0), seed ), f - vec2(1.0,1.0) ), u.x), u.y); } float fbm1(in vec2 _st, float seed) { float v = 0.0; float a = 0.5; vec2 shift = vec2(100.0); // Rotate to reduce axial bias mat2 rot = mat2(cos(0.5), sin(0.5), -sin(0.5), cos(0.50)); for (int i = 0; i < octaves; ++i) { v += a * noise(_st, seed); _st = rot * _st * 2.0 + shift; a *= 0.4; } return v + .4; } float pattern(vec2 uv, float seed, float time, inout vec2 q, inout vec2 r) { q = vec2( fbm1( uv + vec2(0.0,0.0), seed ), fbm1( uv + vec2(5.2,1.3), seed ) ); r = vec2( fbm1( uv + 4.0*q + vec2(1.7 - time / 2.,9.2), seed ), fbm1( uv + 4.0*q + vec2(8.3 - time / 2.,2.8), seed ) ); float rtn = fbm1( uv + 4.0*r, seed ); return rtn; } mat2 rotate(float angle) { return mat2(cos(angle), -sin(angle), sin(angle), cos(angle)); } void main() { vec2 uv = (gl_FragCoord.xy - 0.5 * u_resolution.xy) / u_resolution.y; // Generate our displacement map vec2 _uv = uv * NOISE_SIZE; vec2 q = vec2(0.); vec2 r = vec2(0.); float pattern = pattern(_uv, seed, u_time/2., q, r); uv += (.5 - pattern) / INTENSITY; // modulate the main UV coordinates by the pattern // uv -= .5 / INTENSITY; // This just recenters the UV coords after the distortion float len = length(uv) + .01; float field = len+0.05*(-1.0*u_time / 5.); // The distance field from the middle to the edge float ripple; ripple = sin(field*80.0) * .5 * r.x * pattern + 1.; // The ripple pattern ripple += smoothstep(0.2,.0,len); // Adding a core gradient to the sun. Essentially this is just a smoothed version of the distance field ripple *= smoothstep(0.3,.9,clamp(1. - len * 1.5,0.0,1.0)); // Vignette the sun, making it smaller than infinity ripple -= fract(ripple * 8.) / 100.; // Adds a nice sort of reflective element vec3 colour = vec3(.2, .3, .4); // the basic colour colour += ripple * length(r) * vec3(1., 1., .8); // ripple times sun colour colour += (1. - pattern * REFLECTION_INTENSITY * .5) * smoothstep(0.0,.7,clamp(1. - len * 1.5,0.0,1.0)) * vec3(-.2, -.1, 0.); // vignette and reflection colour += (1. - pattern * REFLECTION_INTENSITY * 2.) * smoothstep(0.5,.9,clamp(1. - len * 1.5,0.0,1.0)) * vec3(-.2, -.1, 0.); // vignette and reflection 2 - this is essentially a more intense, but reduced radius version of the previous one. gl_FragColor = vec4(colour, 1.); } </script> <script src="/js/sun.js"></script> |
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