GPU Particles Archives

URL: http://glslsandbox.com/e#37553.0

// Majestic Wireframe Cube
// By: Brandon Fogerty
// bfogerty at gmail dot com
// xdpixel.com

#ifdef GL_ES
precision mediump float;
#endif

#extension GL_OES_standard_derivatives : enable

uniform float time;
uniform vec2 mouse;
uniform vec2 resolution;

float line( vec2 a, vec2 b, vec2 p )
{
    vec2 aTob = b - a;
    vec2 aTop = p - a;

    float t = dot( aTop, aTob ) / dot( aTob, aTob);

    t = clamp( t, 0.0, 1.0);

    float d = length( p - (a + aTob * t) );
    d = 0.05 / d;

    d = pow(d, 7.0);
    return clamp( d, 0.0, 1.0 );
}

mat4 perspectiveMatrix(float fovYInRad, float aspectRatio)
{
    float yScale = 1.0/tan(fovYInRad / 2.0);
    float xScale = yScale / aspectRatio;
    float zf = 100.0;
    float zn = 0.3;

    float z1 = zf/(zf-zn);
    float z2 = -zn*zf/(zf-zn);

    mat4 result = mat4(xScale, 0.0, 0.0, 0.0,
              0.0, yScale, 0.0, 0.0,
              0.0, 0.0, z1, z2,
              0.0, 0.0, -1.0, 0.0);

    return result;
}

mat4 translationMatrix(vec3 pos)
{
    mat4 result = 
    mat4(1.0, 0.0, 0.0, 0.0, 
         0.0, 1.0, 0.0, 0.0,
         0.0, 0.0, 1.0, 0.0,
         pos.x, pos.y, pos.z, 1.0 );

    return result;
}

mat4 rotXMatrix(float theta)
{
    float cs = cos(theta);
    float ss = sin(theta);

    mat4 result = 
    mat4(1.0, 0.0, 0.0, 0.0, 
         0.0, cs, -ss, 0.0,
         0.0, ss, cs, 0.0,
         0.0, 0.0, 0.0, 1.0 );

    return result;
}

mat4 rotYMatrix(float theta)
{
    float cs = cos(theta);
    float ss = sin(theta);

    mat4 result = 
    mat4(cs, 0.0, -ss, 0.0, 
         0.0, 1.0, 0.0, 0.0,
         ss, 0.0, cs, 0.0,
         0.0, 0.0, 0.0, 1.0 );

    return result;
}

float particle(vec2 uv, vec4 vert, mat4 mvp, vec2 sizeRange, float sizeOffset, vec2 moveSpeed)
{
    vec4 v = mvp * vert;
    vec2 vp = (v.xy / v.w);

    float size = mix(sizeRange.x, sizeRange.y, sin(time + sizeOffset) * 0.5 + 0.5);
    float t = 1.0 / abs(length(uv.xy - (vp.xy + vec2(cos(time * moveSpeed.x), sin(time * moveSpeed.y)))) * size);

    t = pow( t, 1.5);

    return t;
}

void main( void )
{
    vec2 uv = ( gl_FragCoord.xy / resolution.xy ) * 2.0 - 1.0;

    uv *= 10.0;

    const float fovYInRad = (45.0/180.0) * 3.14159;
    float aspectRatio = resolution.x / resolution.y;

    const float vs = 10.0;
    #define maxVerts 16
    vec4 verts [maxVerts];
    verts[0] = vec4( -vs, -vs, vs, 1.0 );
    verts[1] = vec4( -vs,  vs, vs, 1.0 );
    verts[2] = vec4(  vs,  vs, vs, 1.0 );
    verts[3] = vec4(  vs, -vs, vs, 1.0 );

    verts[4] = vec4( -vs, -vs, vs, 1.0 );
    verts[5] = vec4( -vs,  vs, vs, 1.0 );
    verts[6] = vec4( -vs,  vs, -vs, 1.0 );
    verts[7] = vec4( -vs, -vs, -vs, 1.0 );

    verts[8] = vec4( -vs, -vs, -vs, 1.0 );
    verts[9] = vec4( -vs,  vs, -vs, 1.0 );
    verts[10] = vec4( vs,  vs, -vs, 1.0 );
    verts[11] = vec4( vs, -vs, -vs, 1.0 );

    verts[12] = vec4( vs, -vs, vs, 1.0 );
    verts[13] = vec4( vs,  vs, vs, 1.0 );
    verts[14] = vec4( vs,  vs, -vs, 1.0 );
    verts[15] = vec4( vs, -vs, -vs, 1.0 );

    float moveX = mix(10.0, -10.0, sin(time * 0.4) * 0.5 + 0.5);
    float moveY = mix(10.0, -10.0, sin(time * 0.2) * 0.5 + 0.5);
    float moveZ = mix(40.0, 60.0, sin(time * 0.2) * 0.5 + 0.5);

    vec3 pos = vec3( moveX, moveY, moveZ);
    mat4 rotY = rotYMatrix(time) * rotXMatrix(time * 0.5);

    mat4 worldMat = translationMatrix(pos) * rotY;
    mat4 perspective = perspectiveMatrix(fovYInRad, aspectRatio);

    mat4 mvp = perspective * worldMat;

    float t = 0.0;
    for(int i = 0; i < maxVerts; ++i)
    {
        vec4 startWorldVert = mvp * verts[i];
        vec4 endWorldVert;
        if( i+1 < maxVerts)
        {
            endWorldVert = mvp * verts[i + 1];
        }
        else
        {
            endWorldVert = mvp * verts[i - 3];
        }

        if(i != 0 && mod(float(i+1), 4.0) == 0.0)
        {
            endWorldVert = mvp * verts[i - 3];
        }

        vec2 sp = startWorldVert.xy / startWorldVert.w;
        vec2 ep = endWorldVert.xy / endWorldVert.w;

        t += line( sp, ep, uv);
    }

    vec3 fc = vec3( 0.00 );
    fc += vec3(pow(abs(uv.y / 10.0), 2.5));

    fc += vec3( 2.0, 4.0, 8.0 ) * pow(t, 0.2);

    uv.x *= resolution.x / resolution.y;

    t = particle(uv, verts[0], mvp, vec2(20.0, 40.0), 1.0, vec2( 3.0, 1.0));
    fc += vec3(8.0, 4.0, 2.0) * t;

    t = particle(uv, verts[1], mvp, vec2(20.0, 40.0), 14.0, vec2( 1.0, 3.0));
    fc += vec3(4.0, 8.0, 2.0) * t;

    t = particle(uv, verts[10], mvp, vec2(10.0, 40.0), 25.0, vec2( 2.0, 1.0));
    fc += vec3(3.0, 2.0, 7.0) * t;

    t = particle(uv, verts[12], mvp, vec2(10.0, 40.0), 78.0, vec2( 5.0, 3.0));
    fc += vec3(4.0, 3.0, 8.0) * t;

    t = particle(uv, verts[6], mvp, vec2(10.0, 40.0), 100.0, vec2( 5.0, 3.0));
    fc += vec3(8.0, 1.0, 1.0) * t;

    gl_FragColor = vec4( fc, 1.0 );

}

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// Majestic Wireframe Cube

// By: Brandon Fogerty

// bfogerty at gmail dot com

// xdpixel.com

#ifdef GL_ES

precision mediump float;

#endif

#extension GL_OES_standard_derivatives : enable

uniform float time;

uniform vec2 mouse;

uniform vec2 resolution;

float line( vec2 a, vec2 b, vec2 p )

{

vec2 aTob = b - a;

vec2 aTop = p - a;

float t = dot( aTop, aTob ) / dot( aTob, aTob);

t = clamp( t, 0.0, 1.0);

float d = length( p - (a + aTob * t) );

d = 0.05 / d;

d = pow(d, 7.0);

return clamp( d, 0.0, 1.0 );

}

mat4 perspectiveMatrix(float fovYInRad, float aspectRatio)

{

float yScale = 1.0/tan(fovYInRad / 2.0);

float xScale = yScale / aspectRatio;

float zf = 100.0;

float zn = 0.3;

float z1 = zf/(zf-zn);

float z2 = -zn*zf/(zf-zn);

mat4 result = mat4(xScale, 0.0, 0.0, 0.0,

0.0, yScale, 0.0, 0.0,

0.0, 0.0, z1, z2,

0.0, 0.0, -1.0, 0.0);

return result;

}

mat4 translationMatrix(vec3 pos)

{

mat4 result =

mat4(1.0, 0.0, 0.0, 0.0,

0.0, 1.0, 0.0, 0.0,

0.0, 0.0, 1.0, 0.0,

pos.x, pos.y, pos.z, 1.0 );

return result;

}

mat4 rotXMatrix(float theta)

{

float cs = cos(theta);

float ss = sin(theta);

mat4 result =

mat4(1.0, 0.0, 0.0, 0.0,

0.0, cs, -ss, 0.0,

0.0, ss, cs, 0.0,

0.0, 0.0, 0.0, 1.0 );

return result;

}

mat4 rotYMatrix(float theta)

{

float cs = cos(theta);

float ss = sin(theta);

mat4 result =

mat4(cs, 0.0, -ss, 0.0,

0.0, 1.0, 0.0, 0.0,

ss, 0.0, cs, 0.0,

0.0, 0.0, 0.0, 1.0 );

return result;

}

float particle(vec2 uv, vec4 vert, mat4 mvp, vec2 sizeRange, float sizeOffset, vec2 moveSpeed)

{

vec4 v = mvp * vert;

vec2 vp = (v.xy / v.w);

float size = mix(sizeRange.x, sizeRange.y, sin(time + sizeOffset) * 0.5 + 0.5);

float t = 1.0 / abs(length(uv.xy - (vp.xy + vec2(cos(time * moveSpeed.x), sin(time * moveSpeed.y)))) * size);

t = pow( t, 1.5);

return t;

}

void main( void )

{

vec2 uv = ( gl_FragCoord.xy / resolution.xy ) * 2.0 - 1.0;

uv *= 10.0;

const float fovYInRad = (45.0/180.0) * 3.14159;

float aspectRatio = resolution.x / resolution.y;

const float vs = 10.0;

#define maxVerts 16

vec4 verts [maxVerts];

verts[0] = vec4( -vs, -vs, vs, 1.0 );

verts[1] = vec4( -vs, vs, vs, 1.0 );

verts[2] = vec4( vs, vs, vs, 1.0 );

verts[3] = vec4( vs, -vs, vs, 1.0 );

verts[4] = vec4( -vs, -vs, vs, 1.0 );

verts[5] = vec4( -vs, vs, vs, 1.0 );

verts[6] = vec4( -vs, vs, -vs, 1.0 );

verts[7] = vec4( -vs, -vs, -vs, 1.0 );

verts[8] = vec4( -vs, -vs, -vs, 1.0 );

verts[9] = vec4( -vs, vs, -vs, 1.0 );

verts[10] = vec4( vs, vs, -vs, 1.0 );

verts[11] = vec4( vs, -vs, -vs, 1.0 );

verts[12] = vec4( vs, -vs, vs, 1.0 );

verts[13] = vec4( vs, vs, vs, 1.0 );

verts[14] = vec4( vs, vs, -vs, 1.0 );

verts[15] = vec4( vs, -vs, -vs, 1.0 );

float moveX = mix(10.0, -10.0, sin(time * 0.4) * 0.5 + 0.5);

float moveY = mix(10.0, -10.0, sin(time * 0.2) * 0.5 + 0.5);

float moveZ = mix(40.0, 60.0, sin(time * 0.2) * 0.5 + 0.5);

vec3 pos = vec3( moveX, moveY, moveZ);

mat4 rotY = rotYMatrix(time) * rotXMatrix(time * 0.5);

mat4 worldMat = translationMatrix(pos) * rotY;

mat4 perspective = perspectiveMatrix(fovYInRad, aspectRatio);

mat4 mvp = perspective * worldMat;

float t = 0.0;

for(int i = 0; i < maxVerts; ++i)

{

vec4 startWorldVert = mvp * verts[i];

vec4 endWorldVert;

if( i+1 < maxVerts)

{

endWorldVert = mvp * verts[i + 1];

}

else

{

endWorldVert = mvp * verts[i - 3];

}

if(i != 0 && mod(float(i+1), 4.0) == 0.0)

{

endWorldVert = mvp * verts[i - 3];

}

vec2 sp = startWorldVert.xy / startWorldVert.w;

vec2 ep = endWorldVert.xy / endWorldVert.w;

t += line( sp, ep, uv);

}

vec3 fc = vec3( 0.00 );

fc += vec3(pow(abs(uv.y / 10.0), 2.5));

fc += vec3( 2.0, 4.0, 8.0 ) * pow(t, 0.2);

uv.x *= resolution.x / resolution.y;

t = particle(uv, verts[0], mvp, vec2(20.0, 40.0), 1.0, vec2( 3.0, 1.0));

fc += vec3(8.0, 4.0, 2.0) * t;

t = particle(uv, verts[1], mvp, vec2(20.0, 40.0), 14.0, vec2( 1.0, 3.0));

fc += vec3(4.0, 8.0, 2.0) * t;

t = particle(uv, verts[10], mvp, vec2(10.0, 40.0), 25.0, vec2( 2.0, 1.0));

fc += vec3(3.0, 2.0, 7.0) * t;

t = particle(uv, verts[12], mvp, vec2(10.0, 40.0), 78.0, vec2( 5.0, 3.0));

fc += vec3(4.0, 3.0, 8.0) * t;

t = particle(uv, verts[6], mvp, vec2(10.0, 40.0), 100.0, vec2( 5.0, 3.0));

fc += vec3(8.0, 1.0, 1.0) * t;

gl_FragColor = vec4( fc, 1.0 );

}

xdPixel

Category Archives: GPU Particles

Majestic Wire Cube

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