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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 | //This file is automatically rebuilt by the Cesium build process.
export default " /**\n\
* Decodes a unit-length vector in 'oct' encoding to a normalized 3-component Cartesian vector.\n\
* The 'oct' encoding is described in \"A Survey of Efficient Representations of Independent Unit Vectors\",\n\
* Cigolle et al 2014: http://jcgt.org/published/0003/02/01/\n\
*\n\
* @name czm_octDecode\n\
* @param {vec2} encoded The oct-encoded, unit-length vector\n\
* @param {float} range The maximum value of the SNORM range. The encoded vector is stored in log2(rangeMax+1) bits.\n\
* @returns {vec3} The decoded and normalized vector\n\
*/\n\
vec3 czm_octDecode(vec2 encoded, float range)\n\
{\n\
if (encoded.x == 0.0 && encoded.y == 0.0) {\n\
return vec3(0.0, 0.0, 0.0);\n\
}\n\
\n\
encoded = encoded / range * 2.0 - 1.0;\n\
vec3 v = vec3(encoded.x, encoded.y, 1.0 - abs(encoded.x) - abs(encoded.y));\n\
if (v.z < 0.0)\n\
{\n\
v.xy = (1.0 - abs(v.yx)) * czm_signNotZero(v.xy);\n\
}\n\
\n\
return normalize(v);\n\
}\n\
\n\
/**\n\
* Decodes a unit-length vector in 'oct' encoding to a normalized 3-component Cartesian vector.\n\
* The 'oct' encoding is described in \"A Survey of Efficient Representations of Independent Unit Vectors\",\n\
* Cigolle et al 2014: http://jcgt.org/published/0003/02/01/\n\
*\n\
* @name czm_octDecode\n\
* @param {vec2} encoded The oct-encoded, unit-length vector\n\
* @returns {vec3} The decoded and normalized vector\n\
*/\n\
vec3 czm_octDecode(vec2 encoded)\n\
{\n\
return czm_octDecode(encoded, 255.0);\n\
}\n\
\n\
/**\n\
* Decodes a unit-length vector in 'oct' encoding packed into a floating-point number to a normalized 3-component Cartesian vector.\n\
* The 'oct' encoding is described in \"A Survey of Efficient Representations of Independent Unit Vectors\",\n\
* Cigolle et al 2014: http://jcgt.org/published/0003/02/01/\n\
*\n\
* @name czm_octDecode\n\
* @param {float} encoded The oct-encoded, unit-length vector\n\
* @returns {vec3} The decoded and normalized vector\n\
*/\n\
vec3 czm_octDecode(float encoded)\n\
{\n\
float temp = encoded / 256.0;\n\
float x = floor(temp);\n\
float y = (temp - x) * 256.0;\n\
return czm_octDecode(vec2(x, y));\n\
}\n\
\n\
/**\n\
* Decodes three unit-length vectors in 'oct' encoding packed into two floating-point numbers to normalized 3-component Cartesian vectors.\n\
* The 'oct' encoding is described in \"A Survey of Efficient Representations of Independent Unit Vectors\",\n\
* Cigolle et al 2014: http://jcgt.org/published/0003/02/01/\n\
*\n\
* @name czm_octDecode\n\
* @param {vec2} encoded The packed oct-encoded, unit-length vectors.\n\
* @param {vec3} vector1 One decoded and normalized vector.\n\
* @param {vec3} vector2 One decoded and normalized vector.\n\
* @param {vec3} vector3 One decoded and normalized vector.\n\
*/\n\
void czm_octDecode(vec2 encoded, out vec3 vector1, out vec3 vector2, out vec3 vector3)\n\
{\n\
float temp = encoded.x / 65536.0;\n\
float x = floor(temp);\n\
float encodedFloat1 = (temp - x) * 65536.0;\n\
\n\
temp = encoded.y / 65536.0;\n\
float y = floor(temp);\n\
float encodedFloat2 = (temp - y) * 65536.0;\n\
\n\
vector1 = czm_octDecode(encodedFloat1);\n\
vector2 = czm_octDecode(encodedFloat2);\n\
vector3 = czm_octDecode(vec2(x, y));\n\
}\n\
\n\
";
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