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- /**
- * Unpacks a vec4 depth value to a float in [0, 1) range.
- *
- * @name czm_unpackDepth
- * @glslFunction
- *
- * @param {vec4} packedDepth The packed depth.
- *
- * @returns {float} The floating-point depth in [0, 1) range.
- */
- float czm_unpackDepth(vec4 packedDepth)
- {
- // See Aras Pranckevičius' post Encoding Floats to RGBA
- // http://aras-p.info/blog/2009/07/30/encoding-floats-to-rgba-the-final/
- return dot(packedDepth, vec4(1.0, 1.0 / 255.0, 1.0 / 65025.0, 1.0 / 16581375.0));
- }
|
