OSMAND_CORE_API float OSMAND_CORE_CALL OsmAnd::Utilities_OpenGL_Common::calculateCameraDistance( const glm::mat4& P, const AreaI& viewport, const float& Ax, const float& Sx, const float& k ) { const float w = viewport.width(); const float x = viewport.left; const float fw = (Sx*k) / (0.5f * w); float d = (Ax * P[0][0])/fw; return d; }