初つぶやきGLSL
:#ifdef GL_ES
precision mediump float;
#endif
#extension GL_OES_standard_derivatives : enable
uniform float time;
uniform vec2 mouse;
uniform vec2 resolution;
#define PI 3.1415926535897932384626433832795
void main( void ) {
float t = time / PI;
mat2 m = mat2(cos(t), -sin(t), sin(t), cos(t));
if(fract(t / PI / 2.) < .5){
vec2 p = fract( gl_FragCoord.xy / min(resolution.x, resolution.y) * 10. ) - 0.5;
p = m * p;
vec2 p2 = abs(p);
float c = step(p2.x + p2.y, .5);
gl_FragColor = vec4( c );
}else{
vec2 p = fract( gl_FragCoord.xy / min(resolution.x, resolution.y) * 10. + .5) - 0.5;
p = m * p;
vec2 p2 = abs(p);
float c = step(0.5, p2.x + p2.y);
gl_FragColor = vec4( c );
}
}:void main( void ) {
float t = time;
vec2 r = resolution;
mat2 m = mat2(cos(t), -sin(t), sin(t), cos(t));
vec2 a=gl_FragCoord.xy / min(r.x, r.y) * 10.;
float c;
bool b = fract(t / PI / 2.) < .5;
vec2 p = fract( a + (b ? 0.:.5)) - 0.5;
vec2 p2 = abs(m * p);
if(b){
c = step(p2.x + p2.y, .5);
}else{
c = step(.5, p2.x + p2.y);
}
gl_FragColor = vec4( c );
}:void main( void ) {
float t = time;
vec2 r = resolution;
mat2 m = mat2(cos(t), -sin(t), sin(t), cos(t));
vec2 a=gl_FragCoord.xy / min(r.x, r.y) * 10.;
float c;
bool b = fract(t / PI / 2.) < .5;
vec2 p = fract( a + (b ? 0.:.5)) - 0.5;
vec2 p2 = abs(m * p);
c = step(p2.x + p2.y, .5);
c = b?c:1.-c;
gl_FragColor = vec4( c );
}:void main() {
float t = time;
vec2 r = resolution;
bool b=fract(t/atan(0.,-1.)/2.)<.5;
vec2 a=gl_FragCoord.xy/min(r.x,r.y)*10.,p=fract(a+(b?0.:.5))-.5,q=abs(mat2(cos(t),-sin(t),sin(t),cos(t))*p);
float c=step(q.x+q.y,.5);
gl_FragColor=vec4(b?c:1.-c);
}