first commit

docs/before-mosaic-reference/mosaic.frag

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+uniform sampler2D uSceneTexture; uniform mat4 uContentViewProjection; uniform mat4 uContentInverseViewProjection; uniform vec3 uContentCameraPosition; uniform float uGlassZ,uGridSize,uStrength,uTime; uniform vec2 uViewOffset,uResolution,uPetSize;
+varying vec2 vUv;
+vec2 projectUv(vec3 p){vec4 c=uContentViewProjection*vec4(p,1.);float w=abs(c.w)<.0001?(c.w<0.?-.0001:.0001):c.w;return c.xy/w*.5+.5;}
+vec4 sampleScene(vec2 uv){if(any(lessThan(uv,vec2(0.)))||any(greaterThan(uv,vec2(1.))))return vec4(.005605,.009721,.016807,1.);return texture2D(uSceneTexture,uv);}
+float hash(vec2 p){return fract(sin(dot(p,vec2(127.1,311.7)))*43758.5453);} float safeZ(float z){return abs(z)<.0001?(z<0.?-.0001:.0001):z;}
+vec3 bend(vec3 i,vec3 n){vec3 r=refract(i,n,.75);return length(r)<.0001?i:r;}
+void main(){vec2 q=vUv*2.-1.;vec4 fh=uContentInverseViewProjection*vec4(q,1.,1.);float fwDen=abs(fh.w)<.0001?(fh.w<0.?-.0001:.0001):fh.w;vec3 fw=fh.xyz/fwDen;vec3 i=normalize(fw-uContentCameraPosition);float gt=(uGlassZ-uContentCameraPosition.z)/safeZ(i.z);vec3 gh=uContentCameraPosition+i*gt;vec2 grid=vec2(uGridSize,max(1.,uGridSize*uPetSize.y/uPetSize.x));vec2 s=vUv*grid,cell=floor(s),local=fract(s)-.5;float var=mix(.85,1.15,hash(cell));vec2 ll=local+uViewOffset*(.12+.08*hash(cell+vec2(9.)));float bulge=max(0.,.25-dot(ll,ll));vec3 n=normalize(vec3(-ll*bulge*1.8*var,1.));vec3 r=bend(i,n);vec3 sh=gh+i*(-gh.z/safeZ(i.z)),bh=gh+r*(-gh.z/safeZ(r.z));vec2 ru=vUv+projectUv(bh)-projectUv(sh);vec2 uv=mix(vUv,ru,clamp(uStrength,0.,1.));vec4 c=sampleScene(uv);float edge=smoothstep(.46,.5,max(abs(local.x),abs(local.y)));c.rgb*=mix(1.,.75,edge*clamp(uStrength,0.,1.));c.a=1.;gl_FragColor=c;
+  #include <colorspace_fragment>
+}