d66251234d
GLIBC 2.27 added new versioned symbols of powf and logf, while the double versions of pow and log remained stable. Prefer the double version to avoid introducing a dependency on a newer version of GLIBC than strictly necessary. See https://lists.gnu.org/archive/html/info-gnu/2018-02/msg00000.html
23 lines
573 B
C++
23 lines
573 B
C++
#include <mbgl/util/interpolate.hpp>
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#include <cmath>
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namespace mbgl {
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namespace util {
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float interpolationFactor(float base, Range<float> range, float z) {
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const float zoomDiff = range.max - range.min;
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const float zoomProgress = z - range.min;
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if (zoomDiff == 0) {
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return 0;
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} else if (base == 1.0f) {
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return zoomProgress / zoomDiff;
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} else {
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return (std::pow(static_cast<double>(base), zoomProgress) - 1) /
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(std::pow(static_cast<double>(base), zoomDiff) - 1);
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}
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}
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} // namespace util
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} // namespace mbgl
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