Created
May 26, 2021 17:54
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| // Setting bounds because your packed flaot will go from 0->1 | |
| const float BOUNDS = 1000.0; | |
| float unnormalizeCoordinate(float x) { | |
| return (x * 2.0 - 1.0) * BOUNDS; | |
| } | |
| float normalizeCoordinate(float x) { | |
| return (x / BOUNDS) * 0.5 + 0.5; | |
| } | |
| const vec4 bitEnc = vec4(1.,255.,65025.,16581375.); | |
| const vec4 bitDec = 1./bitEnc; | |
| vec4 packRGBA (float v) { | |
| vec4 enc = bitEnc * v; | |
| enc = fract(enc); | |
| enc -= enc.yzww * vec2(1./255., 0.).xxxy; | |
| return enc; | |
| } | |
| float unpackRGBA (vec4 v) { | |
| v = floor(v * 255.0 + 0.5) / 255.0; | |
| return dot(v, bitDec); | |
| } | |
| // to get your position | |
| // if you are using multiple render textures | |
| float x = unnormalizeCoordinate( unpackRGBA(texture2d( posXDataTexture , uvlocation)); | |
| float y = unnormalizeCoordinate( unpackRGBA(texture2d( posYDataTexture , uvlocation)); | |
| float z = unnormalizeCoordinate( unpackRGBA(texture2d( posZDataTexture , uvlocation)); | |
| // to get your position | |
| // if you are using one data texture ( uvLocation will change based on which pixel you want to look up ) | |
| float x = unnormalizeCoordinate( unpackRGBA(texture2d( posDataTexture , uvlocationX)); | |
| float y = unnormalizeCoordinate( unpackRGBA(texture2d( posDataTexture , uvlocationY)); | |
| float z = unnormalizeCoordinate( unpackRGBA(texture2d( posDataTexture , uvlocationZ)); | |
| float3 pos = float3(x,y,z) | |
| // if using multiple data textures, pack casually | |
| gl_FragColor = packRGBA(normalizeCoordinate(pos.x)); | |
| if just 1 data texture, you will need to know which type of pixel you need to pack | |
| if( id == 0 ){ | |
| gl_FragColor = packRGBA(normalizeCoordinate(pos.x)); | |
| }else if( id == 1 ){ | |
| gl_FragColor = packRGBA(normalizeCoordinate(pos.y)); | |
| }else{ | |
| gl_FragColor = packRGBA(normalizeCoordinate(pos.z)); | |
| } |
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