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HTML制作背景落英缤纷的场景代码

 

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

<title>动态散花背景</title>

<meta name="description" content="Change OR Die" />

</head>

<body>

<style type="text/css">

*{margin:0;padding:0;list-style-type:none;}

a,img{border:0;}

body{font:12px/180% Arial, Helvetica, sans-serif, "新宋体";}

</style>

<canvas id="sakura"></canvas>

<!-- sakura shader -->

<script id="sakura_point_vsh" type="x-shader/x_vertex">

uniform mat4 uProjection;

uniform mat4 uModelview;

uniform vec3 uResolution;

uniform vec3 uOffset;

uniform vec3 uDOF; //x:focus distance, y:focus radius, z:max radius

uniform vec3 uFade; //x:start distance, y:half distance, z:near fade start

attribute vec3 aPosition;

attribute vec3 aEuler;

attribute vec2 aMisc; //x:size, y:fade

varying vec3 pposition;

varying float psize;

varying float palpha;

varying float pdist;

//varying mat3 rotMat;

varying vec3 normX;

varying vec3 normY;

varying vec3 normZ;

varying vec3 normal;

varying float diffuse;

varying float specular;

varying float rstop;

varying float distancefade;

void main(void) {

// Projection is based on vertical angle

vec4 pos = uModelview * vec4(aPosition + uOffset, 1.0);

gl_Position = uProjection * pos;

gl_PointSize = aMisc.x * uProjection[1][1] / -pos.z * uResolution.y * 0.5;

pposition = pos.xyz;

psize = aMisc.x;

pdist = length(pos.xyz);

palpha = smoothstep(0.0, 1.0, (pdist - 0.1) / uFade.z);

vec3 elrsn = sin(aEuler);

vec3 elrcs = cos(aEuler);

mat3 rotx = mat3(

1.0, 0.0, 0.0,

0.0, elrcs.x, elrsn.x,

0.0, -elrsn.x, elrcs.x

);

mat3 roty = mat3(

elrcs.y, 0.0, -elrsn.y,

0.0, 1.0, 0.0,

elrsn.y, 0.0, elrcs.y

);

mat3 rotz = mat3(

elrcs.z, elrsn.z, 0.0,

-elrsn.z, elrcs.z, 0.0,

0.0, 0.0, 1.0

);

mat3 rotmat = rotx * roty * rotz;

normal = rotmat[2];

mat3 trrotm = mat3(

rotmat[0][0], rotmat[1][0], rotmat[2][0],

rotmat[0][1], rotmat[1][1], rotmat[2][1],

rotmat[0][2], rotmat[1][2], rotmat[2][2]

);

normX = trrotm[0];

normY = trrotm[1];

normZ = trrotm[2];

const vec3 lit = vec3(0.6917144638660746, 0.6917144638660746, -0.20751433915982237);

float tmpdfs = dot(lit, normal);

if(tmpdfs < 0.0) {

normal = -normal;

tmpdfs = dot(lit, normal);

}

diffuse = 0.4 + tmpdfs;

vec3 eyev = normalize(-pos.xyz);

if(dot(eyev, normal) > 0.0) {

vec3 hv = normalize(eyev + lit);

specular = pow(max(dot(hv, normal), 0.0), 20.0);

}

else {

specular = 0.0;

}

rstop = clamp((abs(pdist - uDOF.x) - uDOF.y) / uDOF.z, 0.0, 1.0);

rstop = pow(rstop, 0.5);

//-0.69315 = ln(0.5)

distancefade = min(1.0, exp((uFade.x - pdist) * 0.69315 / uFade.y));

}

</script>

<script id="sakura_point_fsh" type="x-shader/x_fragment">

#ifdef GL_ES

//precision mediump float;

precision highp float;

#endif

uniform vec3 uDOF; //x:focus distance, y:focus radius, z:max radius

uniform vec3 uFade; //x:start distance, y:half distance, z:near fade start

const vec3 fadeCol = vec3(0.08, 0.03, 0.06);

varying vec3 pposition;

varying float psize;

varying float palpha;

varying float pdist;

//varying mat3 rotMat;

varying vec3 normX;

varying vec3 normY;

varying vec3 normZ;

varying vec3 normal;

varying float diffuse;

varying float specular;

varying float rstop;

varying float distancefade;

float ellipse(vec2 p, vec2 o, vec2 r) {

vec2 lp = (p - o) / r;

return length(lp) - 1.0;

}

void main(void) {

vec3 p = vec3(gl_PointCoord - vec2(0.5, 0.5), 0.0) * 2.0;

vec3 d = vec3(0.0, 0.0, -1.0);

float nd = normZ.z; //dot(-normZ, d);

if(abs(nd) < 0.0001) discard;

float np = dot(normZ, p);

vec3 tp = p + d * np / nd;

vec2 coord = vec2(dot(normX, tp), dot(normY, tp));

//angle = 15 degree

const float flwrsn = 0.258819045102521;

const float flwrcs = 0.965925826289068;

mat2 flwrm = mat2(flwrcs, -flwrsn, flwrsn, flwrcs);

vec2 flwrp = vec2(abs(coord.x), coord.y) * flwrm;

float r;

if(flwrp.x < 0.0) {

r = ellipse(flwrp, vec2(0.065, 0.024) * 0.5, vec2(0.36, 0.96) * 0.5);

}

else {

r = ellipse(flwrp, vec2(0.065, 0.024) * 0.5, vec2(0.58, 0.96) * 0.5);

}

if(r > rstop) discard;

vec3 col = mix(vec3(1.0, 0.8, 0.75), vec3(1.0, 0.9, 0.87), r);

float grady = mix(0.0, 1.0, pow(coord.y * 0.5 + 0.5, 0.35));

col *= vec3(1.0, grady, grady);

col *= mix(0.8, 1.0, pow(abs(coord.x), 0.3));

col = col * diffuse + specular;

col = mix(fadeCol, col, distancefade);

float alpha = (rstop > 0.001)? (0.5 - r / (rstop * 2.0)) : 1.0;

alpha = smoothstep(0.0, 1.0, alpha) * palpha;

gl_FragColor = vec4(col * 0.5, alpha);

}

</script>

<!-- effects -->

<script id="fx_common_vsh" type="x-shader/x_vertex">

uniform vec3 uResolution;

attribute vec2 aPosition;

varying vec2 texCoord;

varying vec2 screenCoord;

void main(void) {

gl_Position = vec4(aPosition, 0.0, 1.0);

texCoord = aPosition.xy * 0.5 + vec2(0.5, 0.5);

screenCoord = aPosition.xy * vec2(uResolution.z, 1.0);

}

</script>

<script id="bg_fsh" type="x-shader/x_fragment">

#ifdef GL_ES

//precision mediump float;

precision highp float;

#endif

uniform vec2 uTimes;

varying vec2 texCoord;

varying vec2 screenCoord;

void main(void) {

vec3 col;

float c;

vec2 tmpv = texCoord * vec2(0.8, 1.0) - vec2(0.95, 1.0);

c = exp(-pow(length(tmpv) * 1.8, 2.0));

col = mix(vec3(0.02, 0.0, 0.03), vec3(0.96, 0.98, 1.0) * 1.5, c);

gl_FragColor = vec4(col * 0.5, 1.0);

}

</script>

<script id="fx_brightbuf_fsh" type="x-shader/x_fragment">

#ifdef GL_ES

//precision mediump float;

precision highp float;

#endif

uniform sampler2D uSrc;

uniform vec2 uDelta;

varying vec2 texCoord;

varying vec2 screenCoord;

void main(void) {

vec4 col = texture2D(uSrc, texCoord);

gl_FragColor = vec4(col.rgb * 2.0 - vec3(0.5), 1.0);

}

</script>

<script id="fx_dirblur_r4_fsh" type="x-shader/x_fragment">

#ifdef GL_ES

//precision mediump float;

precision highp float;

#endif

uniform sampler2D uSrc;

uniform vec2 uDelta;

uniform vec4 uBlurDir; //dir(x, y), stride(z, w)

varying vec2 texCoord;

varying vec2 screenCoord;

void main(void) {

vec4 col = texture2D(uSrc, texCoord);

col = col + texture2D(uSrc, texCoord + uBlurDir.xy * uDelta);

col = col + texture2D(uSrc, texCoord - uBlurDir.xy * uDelta);

col = col + texture2D(uSrc, texCoord + (uBlurDir.xy + uBlurDir.zw) * uDelta);

col = col + texture2D(uSrc, texCoord - (uBlurDir.xy + uBlurDir.zw) * uDelta);

gl_FragColor = col / 5.0;

}

</script>

<!-- effect fragment shader template -->

<script id="fx_common_fsh" type="x-shader/x_fragment">

#ifdef GL_ES

//precision mediump float;

precision highp float;

#endif

uniform sampler2D uSrc;

uniform vec2 uDelta;

varying vec2 texCoord;

varying vec2 screenCoord;

void main(void) {

gl_FragColor = texture2D(uSrc, texCoord);

}

</script>

<!-- post processing -->

<script id="pp_final_vsh" type="x-shader/x_vertex">

uniform vec3 uResolution;

attribute vec2 aPosition;

varying vec2 texCoord;

varying vec2 screenCoord;

void main(void) {

gl_Position = vec4(aPosition, 0.0, 1.0);

texCoord = aPosition.xy * 0.5 + vec2(0.5, 0.5);

screenCoord = aPosition.xy * vec2(uResolution.z, 1.0);

}

</script>

<script id="pp_final_fsh" type="x-shader/x_fragment">

#ifdef GL_ES

//precision mediump float;

precision highp float;

#endif

uniform sampler2D uSrc;

uniform sampler2D uBloom;

uniform vec2 uDelta;

varying vec2 texCoord;

varying vec2 screenCoord;

void main(void) {

vec4 srccol = texture2D(uSrc, texCoord) * 2.0;

vec4 bloomcol = texture2D(uBloom, texCoord);

vec4 col;

col = srccol + bloomcol * (vec4(1.0) + srccol);

col *= smoothstep(1.0, 0.0, pow(length((texCoord - vec2(0.5)) * 2.0), 1.2) * 0.5);

col = pow(col, vec4(0.45454545454545)); //(1.0 / 2.2)

gl_FragColor = vec4(col.rgb, 1.0);

gl_FragColor.a = 1.0;

}

</script>

<script src="js/index.js"></script>

<div style="text-align:center;">

<p></p>

</div>

</body>

</html>

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CSS教程文章修订日期:2017-07-30 00:55 原创:DIVCSS5
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