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Beppe Vanrolleghem
2024-06-08 16:36:48 +02:00
parent b723101be7
commit 562de5f046
6 changed files with 289 additions and 0 deletions
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48
learning/2d_matrices/rotations.frag Normal file
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#ifdef GL_ES
precision mediump float;
#endif
uniform vec2 u_resolution;
uniform vec2 u_mouse;
uniform float u_time;
#define PI 3.14159265359
const vec3 uAColor = vec3(.5,.5,.5);
const vec3 uBColor = vec3(.5,.5,.5);
const vec3 uCColor = vec3(1.,1.,1.);
const vec3 uDColor = vec3(.0,.33,.67);
//get colors from http://dev.thi.ng/gradients/
vec3 cosPalette(float t) { return uAColor + uBColor*cos(6.28318*(uCColor*t+uDColor)); }
mat2 rotate2d(float _angle){
return mat2(cos(_angle),-sin(_angle),
sin(_angle),cos(_angle));
}
float crossSDF(vec2 st, float s) {
vec2 size = vec2(.25, s);
float a = max(abs(st.x/size.x),abs(st.y/size.y));
float b = max(abs(st.x/size.y),abs(st.y/size.x));
return min(a,b);
}
float fill(float x, float size) { return 1.-step(size, x); }
void main() {
vec2 st = gl_FragCoord.xy/u_resolution;
st.x *= u_resolution.x/u_resolution.y;
st = (st-.5)*2.;
vec3 color = vec3(0.0,0.0,0.0);
float alpha = 1.0;
vec2 translate = vec2(cos(u_time),sin(u_time));
//move before rotate. i would've thought the opposite
st = st - translate*.35;
st = rotate2d(sin(u_time)*PI) * st;
//color = vec3(st.x,st.y,.0);
color += fill(crossSDF(st,1.),.3);
gl_FragColor = vec4(color, alpha);
}

53
learning/2d_matrices/scale.frag Normal file
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#ifdef GL_ES
precision mediump float;
#endif
uniform vec2 u_resolution;
uniform vec2 u_mouse;
uniform float u_time;
#define PI 3.14159265359
const vec3 uAColor = vec3(.5,.5,.5);
const vec3 uBColor = vec3(.5,.5,.5);
const vec3 uCColor = vec3(1.,1.,1.);
const vec3 uDColor = vec3(.0,.33,.67);
//get colors from http://dev.thi.ng/gradients/
vec3 cosPalette(float t) { return uAColor + uBColor*cos(6.28318*(uCColor*t+uDColor)); }
vec2 rotate(vec2 st, float a) {
st = mat2(cos(a),-sin(a),sin(a),cos(a))*(st);
return st;
}
vec2 scale(vec2 st, vec2 scale) {
return mat2(scale.x,.0,.0,scale.y)*st;
}
float fill(float x, float size) { return 1.-step(size, x); }
float crossSDF(vec2 st, float s) {
vec2 size = vec2(.25, s);
float a = max(abs(st.x/size.x),abs(st.y/size.y));
float b = max(abs(st.x/size.y),abs(st.y/size.x));
return min(a,b);
}
void main() {
vec2 st = gl_FragCoord.xy/u_resolution;
st.x *= u_resolution.x/u_resolution.y;
st = (st-.5)*2.;
vec3 color = vec3(0.0,0.0,0.0);
float alpha = 1.0;
st += vec2(sin(u_time),cos(u_time))*.35;
st = scale(st, vec2(sin(u_time),sin(u_time)));
st = rotate(st,sin(u_time));
float c = crossSDF(st,1.);
color = vec3(st.x,st.y,.0);
color += fill(c,.2);
gl_FragColor = vec4(color, alpha);
}

39
learning/2d_matrices/translate.frag Normal file
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#ifdef GL_ES
precision mediump float;
#endif
uniform vec2 u_resolution;
uniform vec2 u_mouse;
uniform float u_time;
#define PI 3.14159265359
const vec3 uAColor = vec3(.5,.5,.5);
const vec3 uBColor = vec3(.5,.5,.5);
const vec3 uCColor = vec3(1.,1.,1.);
const vec3 uDColor = vec3(.0,.33,.67);
//get colors from http://dev.thi.ng/gradients/
vec3 cosPalette(float t) { return uAColor + uBColor*cos(6.28318*(uCColor*t+uDColor)); }
float crossSDF(vec2 st, float s) {
vec2 size = vec2(.25, s);
float rect1 = max(abs(st.x/size.x),abs(st.y/size.y));
float rect2 = max(abs(st.x/size.y),abs(st.y/size.x));
return min(rect1,rect2);
}
float fill(float x, float size) { return 1.-step(size, x); }
void main() {
vec2 st = gl_FragCoord.xy/u_resolution;
st.x *= u_resolution.x/u_resolution.y;
st = (st-.5)*2.;
vec3 color = vec3(0.0,0.0,0.0);
float alpha = 1.0;
vec2 translate = vec2(0.,sin(u_time));
st += translate*.35;
color = vec3(st.x,st.y,.0);
color += fill(crossSDF(st,1.),.2+(cos(u_time*2.)*.1));
gl_FragColor = vec4(color, alpha);
}

34
learning/2d_matrices/yuvcolor.frag Normal file
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#ifdef GL_ES
precision mediump float;
#endif
uniform vec2 u_resolution;
uniform vec2 u_mouse;
uniform float u_time;
#define PI 3.14159265359
const vec3 uAColor = vec3(.5,.5,.5);
const vec3 uBColor = vec3(.5,.5,.5);
const vec3 uCColor = vec3(1.,1.,1.);
const vec3 uDColor = vec3(.0,.33,.67);
//get colors from http://dev.thi.ng/gradients/
vec3 cosPalette(float t) { return uAColor + uBColor*cos(6.28318*(uCColor*t+uDColor)); }
mat3 yuv2rgb = mat3(1.,.0,1.13983,
1.,-.39465,-.58060,
1.,2.03211,.0);
mat3 rgb2yuv = mat3(.2125,.7152,.0722,-.09991,-.33609,.43600,.615,-.5586,-.05639);
void main() {
vec2 st = gl_FragCoord.xy/u_resolution;
st.x *= u_resolution.x/u_resolution.y;
st = (st-.5)*2.;
vec3 color = vec3(0.0,0.0,0.0);
float alpha = 1.0;
color = yuv2rgb * vec3(.5,st.x,st.y);
gl_FragColor = vec4(color, alpha);
}

41
learning/patterns/matrices.frag Normal file
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#ifdef GL_ES
precision mediump float;
#endif
uniform vec2 u_resolution;
uniform vec2 u_mouse;
uniform float u_time;
#define PI 3.14159265359
const vec3 uAColor = vec3(.5,.5,.5);
const vec3 uBColor = vec3(.5,.5,.5);
const vec3 uCColor = vec3(1.,1.,1.);
const vec3 uDColor = vec3(.0,.33,.67);
//get colors from http://dev.thi.ng/gradients/
vec3 cosPalette(float t) { return uAColor + uBColor*cos(6.28318*(uCColor*t+uDColor)); }
vec2 tile(vec2 st, float tiles) {return fract(st*tiles)-.5; }
vec2 rotate(vec2 st, float a) {
return mat2(cos(a),-sin(a),sin(a),cos(a))*(st);
}
float rectSDF(vec2 st, vec2 s) {
return max(abs(st.x/s.x),abs(st.y/s.y));
}
float fill(float x, float size) { return 1.-step(size, x); }
void main() {
vec2 st = (gl_FragCoord.xy*2. - u_resolution.xy)/u_resolution.y;
vec3 color = vec3(0.0,0.0,0.0);
float alpha = 1.0;
st = tile(st,1.);
st = rotate(st, PI*.25);
color += vec3(fill(rectSDF(st,vec2(1.)),.36));
gl_FragColor = vec4(color, alpha);
}

74
learning/patterns/patterns.frag Normal file
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#ifdef GL_ES
precision mediump float;
#endif
uniform vec2 u_resolution;
uniform vec2 u_mouse;
uniform float u_time;
#define PI 3.14159265359
const vec3 uAColor = vec3(.5,.5,.5);
const vec3 uBColor = vec3(.5,.5,.5);
const vec3 uCColor = vec3(1.,1.,1.);
const vec3 uDColor = vec3(.0,.33,.67);
//get colors from http://dev.thi.ng/gradients/
vec3 cosPalette(float t) { return uAColor + uBColor*cos(6.28318*(uCColor*t+uDColor)); }
float rhombSDF(vec2 st) {
vec2 st1 = (st)*2.;
vec2 st2 = (vec2(st.x,0.-st.y)*2.-1.)*2.;
float triangle1 = max(abs(st1.x)*.866025+st1.y*.5,-st1.y*.5);
float triangle2 = max(abs(st2.x)*.866025+st2.y*.5,-st2.y*.5);
return max(triangle1, triangle2);
}
float fill(float x, float size) { return 1.-step(size, x); }
float circleSDF(vec2 st) { return length(st); }
float triSDF(vec2 st) {
st = st*2.;
return max(abs(st.x)*.866025+st.y*.5,-st.y*.5);
}
float rectSDF(vec2 st, vec2 s) {
return max(abs(st.x/s.x),abs(st.y/s.y));
}
vec2 rotate(vec2 st, float a) {
st = mat2(cos(a),-sin(a),sin(a),cos(a))*(st);
return st;
}
vec2 tile(vec2 st, float tiles) {
return fract(st*tiles)-.5;
}
float polySDF(vec2 st, float angles) {
float a = atan(st.x,st.y)+PI;
float r = length(st);
float v = (2.*PI)/angles;
return cos(floor(.5+a/v)*v-a)*r;
}
void main() {
vec2 st = (gl_FragCoord.xy*2. - u_resolution.xy)/u_resolution.y;
vec3 color = vec3(0.0,0.0,0.0);
float alpha = 1.0;
vec2 st2 = tile(st, 2.);
st2 = rotate(st2, radians(30.*u_time));
float a = atan(st2.y,st2.x);
float fq = cos(a*2.+(st.x+st.y)/2.+u_time/2.);
fq = 1.;
float c = fill(circleSDF(st2),.2+fq*.1);
float t = fill(triSDF(st2),.2+fq*.1);
float r = fill(rectSDF(st2, vec2(1.)),.2+fq*.1);
float f = fill(polySDF(st2, 5.),.2+fq*.1);
color += c*step(st.x,.0)*step(st.y,.0);
color += f*step(st.x,.0)*step(.0,st.y);
color += t*step(0.,st.x)*step(st.y,.0);
color += r*step(.0,st.x)*step(.0,st.y);
gl_FragColor = vec4(color, alpha);
}