diff --git a/include/lol/base/getopt.h b/include/lol/base/getopt.h
index ff7d5430..4747d550 100644
--- a/include/lol/base/getopt.h
+++ b/include/lol/base/getopt.h
@@ -17,25 +17,161 @@
 // --------------------
 //
 
+#include <vector>
+#include <string>
+#include <cstring>
+
 namespace lol
 {
 
 class getopt
 {
 public:
-    getopt(int argc, char ** _argv);
-    getopt(int argc, char * const * _argv);
-    ~getopt();
+    getopt(int argc, char ** argv)
+      : m_argc(argc),
+        m_argv(argv)
+    {
+    }
+
+    getopt(int argc, char * const * argv)
+      : m_argc(argc),
+        m_argv(argv)
+    {
+    }
+
+    void add_opt(int short_opt, char const *long_opt, bool has_arg)
+    {
+        optdesc o { long_opt, has_arg, nullptr, short_opt };
+        m_opts.push_back(o);
+
+        /* “The standards require that the argument [to isalnum()] is either
+         * EOF or a value that is representable in the type unsigned char.” */
+        if ((int)(unsigned char)short_opt == short_opt && isalnum(short_opt))
+        {
+            m_optstring += (char)short_opt;
+            if (has_arg)
+                m_optstring += ':';
+        }
+    }
+
+    int parse()
+    {
+        int longindex = 0; // FIXME: what is this?
+
+        /* XXX: this getopt_long implementation should not be trusted for other
+         * applications without any serious peer reviewing. It “just works” with
+         * zzuf and a few libcaca programs but may fail miserably in other
+         * programs. */
+        char **argv = (char **)(uintptr_t)m_argv;
+        char *flag;
+
+        if (this->index >= m_argc)
+            return -1;
+
+        flag = argv[this->index];
+
+        if (flag[0] == '-' && flag[1] != '-')
+        {
+            char const *tmp;
+            int ret = flag[1];
+
+            if (ret == '\0')
+                return -1;
+
+            tmp = strchr(m_optstring.c_str(), ret);
+            if (!tmp || ret == ':')
+                return '?';
 
-    void add_opt(int short_opt, char const *long_opt, bool has_arg);
-    int parse();
+            ++this->index;
+            if (tmp[1] == ':')
+            {
+                if (flag[2] != '\0')
+                    this->arg = flag + 2;
+                else
+                {
+                    if (this->index >= m_argc)
+                        goto too_few;
+                    this->arg = argv[this->index++];
+                }
+                return ret;
+            }
 
-    int index;
-    char *arg;
+            if (flag[2] != '\0')
+            {
+                flag[1] = '-';
+                --this->index;
+                ++argv[this->index];
+            }
+
+            return ret;
+        }
+
+        if (flag[0] == '-' && flag[1] == '-')
+        {
+            if (flag[2] == '\0')
+                return -1;
+
+            for (int i = 0; m_opts[i].name; ++i)
+            {
+                size_t l = strlen(m_opts[i].name);
+
+                if (strncmp(flag + 2, m_opts[i].name, l))
+                    continue;
+
+                switch (flag[2 + l])
+                {
+                case '=':
+                    if (!m_opts[i].has_arg)
+                        goto bad_opt;
+                    longindex = i;
+                    ++this->index;
+                    this->arg = flag + 2 + l + 1;
+                    return m_opts[i].val;
+                case '\0':
+                    longindex = i;
+                    ++this->index;
+                    if (m_opts[i].has_arg)
+                    {
+                        if (this->index >= m_argc)
+                            goto too_few;
+                        this->arg = argv[this->index++];
+                    }
+                    return m_opts[i].val;
+                default:
+                    break;
+                }
+            }
+        bad_opt:
+            fprintf(stderr, "%s: unrecognized option `%s'\n", argv[0], flag);
+            return '?';
+
+        too_few:
+            fprintf(stderr, "%s: option `%s' requires an argument\n",
+                    argv[0], flag);
+            return '?';
+        }
+
+        return -1;
+    }
+
+    int index = 1;
+    char *arg = nullptr;
 
 private:
-    std::unique_ptr<struct getopt_private> m_private;
+    struct optdesc
+    {
+        char const *name;
+        int has_arg;
+        int *flag;
+        int val;
+    };
+
+    int m_argc;
+    char * const *m_argv;
+
+    std::string m_optstring;
+    std::vector<optdesc> m_opts;
 };
 
-}
+} // namespace lol
 
diff --git a/include/lol/base/thread.h b/include/lol/base/thread.h
index f60117f8..25e48d74 100644
--- a/include/lol/base/thread.h
+++ b/include/lol/base/thread.h
@@ -24,6 +24,7 @@
 #include <thread>
 #include <mutex>
 #include <condition_variable>
+#include <chrono>  // std::chrono
 #include <cassert> // assert()
 
 /* XXX: workaround for a bug in Visual Studio 2012 and 2013!
@@ -233,5 +234,37 @@ private:
     std::condition_variable m_empty_cond, m_full_cond;
 };
 
+class timer
+{
+public:
+    inline timer() { (void)get_seconds(true); }
+
+    inline void reset() { (void)get_seconds(true); }
+    inline float get() { return get_seconds(true); }
+    inline float poll() { return get_seconds(false); }
+
+    void wait(float seconds)
+    {
+        if (seconds > 0.0f)
+        {
+            float secs_elapsed = get_seconds(false);
+            std::this_thread::sleep_for(std::chrono::duration<float>(seconds - secs_elapsed));
+        }
+    }
+
+private:
+    std::chrono::steady_clock::time_point m_tp;
+
+    float get_seconds(bool do_reset)
+    {
+        auto tp = std::chrono::steady_clock::now(), tp0 = m_tp;
+
+        if (do_reset)
+            m_tp = tp;
+
+        return std::chrono::duration_cast<std::chrono::duration<float>>(tp - tp0).count();
+    }
+};
+
 } /* namespace lol */
 
diff --git a/include/lol/math/polynomial.h b/include/lol/math/polynomial.h
index 7a93f8c1..df64a0ad 100644
--- a/include/lol/math/polynomial.h
+++ b/include/lol/math/polynomial.h
@@ -22,8 +22,9 @@
 #include <lol/base/features.h>
 #include <lol/base/core.h>
 
-#include <tuple>   // std::tuple
-#include <cassert> // assert()
+#include <functional> // std::function
+#include <tuple>      // std::tuple
+#include <cassert>    // assert()
 
 namespace lol
 {
@@ -54,7 +55,7 @@ struct LOL_ATTR_NODISCARD polynomial
     static polynomial<T> chebyshev(int n)
     {
         /* Use T0(x) = 1, T1(x) = x, Tn(x) = 2 x Tn-1(x) - Tn-2(x) */
-        auto coeff = [&](int i, int j) -> int64_t
+        std::function<int64_t (int, int)> coeff = [&](int i, int j) -> int64_t
         {
             if (i > j || i < 0 || ((j ^ i) & 1))
                 return (int64_t)0;
@@ -306,7 +307,7 @@ struct LOL_ATTR_NODISCARD polynomial
     /* Add two polynomials */
     polynomial<T> &operator +=(polynomial<T> const &p)
     {
-        int min_degree = lol::min(p.degree(), degree());
+        int min_degree = std::min(p.degree(), degree());
 
         for (int i = 0; i <= min_degree; ++i)
             m_coefficients[i] += p[i];
@@ -414,8 +415,8 @@ private:
     /* Enforce the non-zero leading coefficient rule. */
     void reduce_degree()
     {
-        while (m_coefficients.count() && !m_coefficients.last())
-            (void)m_coefficients.pop();
+        while (m_coefficients.size() && !m_coefficients.back())
+            m_coefficients.pop_back();
     }
 
     /* The polynomial coefficients */
diff --git a/legacy/lol/math/rand.h b/include/lol/math/rand.h
similarity index 74%
rename from legacy/lol/math/rand.h
rename to include/lol/math/rand.h
index 6256b90a..286e030c 100644
--- a/legacy/lol/math/rand.h
+++ b/include/lol/math/rand.h
@@ -1,20 +1,25 @@
 //
-// Lol Engine
+//  Lol Engine
 //
-// Copyright: (c) 2010-2013 Sam Hocevar <sam@hocevar.net>
-//   This program is free software; you can redistribute it and/or
-//   modify it under the terms of the Do What The Fuck You Want To
-//   Public License, Version 2, as published by Sam Hocevar. See
-//   http://www.wtfpl.net/ for more details.
+//  Copyright © 2010—2020 Sam Hocevar <sam@hocevar.net>
+//
+//  Lol Engine is free software. It comes without any warranty, to
+//  the extent permitted by applicable law. You can redistribute it
+//  and/or modify it under the terms of the Do What the Fuck You Want
+//  to Public License, Version 2, as published by the WTFPL Task Force.
+//  See http://www.wtfpl.net/ for more details.
 //
 
 #pragma once
 
 //
 // The Random number generators
-// ----------------------------
+// ————————————————————————————
 //
 
+#include <lol/base/features.h>
+
+#include <cassert>
 #include <cstdlib>
 #include <stdint.h>
 
@@ -32,27 +37,29 @@ template<typename T> LOL_ATTR_NODISCARD static inline T rand(T a)
     return a ? rand<T>() % a : T(0);
 }
 
+#if 0
 template<> LOL_ATTR_NODISCARD inline half rand<half>(half a)
 {
     float f = (float)std::rand() / (float)RAND_MAX;
     return (half)(a * f);
 }
+#endif
 
 template<> LOL_ATTR_NODISCARD inline float rand<float>(float a)
 {
-    float f = (float)std::rand() / (float)RAND_MAX;
+    auto f = (float)std::rand() / (float)RAND_MAX;
     return a * f;
 }
 
 template<> LOL_ATTR_NODISCARD inline double rand<double>(double a)
 {
-    double f = (double)std::rand() / (double)RAND_MAX;
+    auto f = (double)std::rand() / (double)RAND_MAX;
     return a * f;
 }
 
-template<> LOL_ATTR_NODISCARD inline ldouble rand<ldouble>(ldouble a)
+template<> LOL_ATTR_NODISCARD inline long double rand<long double>(long double a)
 {
-    ldouble f = (ldouble)std::rand() / (ldouble)RAND_MAX;
+    auto f = (long double)std::rand() / (long double)RAND_MAX;
     return a * f;
 }
 
@@ -111,16 +118,17 @@ template<typename T> LOL_ATTR_NODISCARD static inline T rand()
         return static_cast<T>(ret & (~(uint64_t)0 >> 1));
     }
     default:
-        ASSERT(false, "rand() doesn’t support types of size %d\n",
-               (int)sizeof(T));
+        assert(false);
         return 0;
     }
 }
 
+#if 0
 template<> LOL_ATTR_NODISCARD inline half rand<half>() { return rand<half>(1.f); }
+#endif
 template<> LOL_ATTR_NODISCARD inline float rand<float>() { return rand<float>(1.f); }
 template<> LOL_ATTR_NODISCARD inline double rand<double>() { return rand<double>(1.0); }
-template<> LOL_ATTR_NODISCARD inline ldouble rand<ldouble>() { return rand<ldouble>(1.0); }
+template<> LOL_ATTR_NODISCARD inline long double rand<long double>() { return rand<long double>(1.0); }
 
 } /* namespace lol */
 
diff --git a/legacy/sys/getopt.cpp b/legacy/sys/getopt.cpp
deleted file mode 100644
index 96221ea0..00000000
--- a/legacy/sys/getopt.cpp
+++ /dev/null
@@ -1,198 +0,0 @@
-//
-//  Lol Engine
-//
-//  Copyright © 2002—2018 Sam Hocevar <sam@hocevar.net>
-//
-//  Lol Engine is free software. It comes without any warranty, to
-//  the extent permitted by applicable law. You can redistribute it
-//  and/or modify it under the terms of the Do What the Fuck You Want
-//  to Public License, Version 2, as published by the WTFPL Task Force.
-//  See http://www.wtfpl.net/ for more details.
-//
-
-#include <lol/engine-internal.h>
-
-#if HAVE_GETOPT_H
-#   include <getopt.h>
-#endif
-#if HAVE_UNISTD_H
-#   include <unistd.h>
-#endif
-
-namespace lol
-{
-
-struct getopt_private
-{
-    getopt_private(int argc, char * const * _argv)
-      : m_argc(argc),
-        m_argv(_argv)
-    {}
-
-#if HAVE_GETOPT_LONG
-    typedef option optdesc;
-#else
-    struct optdesc
-    {
-        char const *name;
-        int has_arg;
-        int *flag;
-        int val;
-    };
-#endif
-
-    int m_argc;
-    char * const *m_argv;
-
-    std::string m_optstring;
-    array<optdesc> m_opts;
-};
-
-getopt::getopt(int argc, char ** _argv)
-  : index(1),
-    arg(nullptr),
-    m_private(new getopt_private(argc, _argv))
-{
-}
-
-getopt::getopt(int argc, char * const * _argv)
-  : index(1),
-    arg(nullptr),
-    m_private(new getopt_private(argc, _argv))
-{
-}
-
-getopt::~getopt()
-{
-}
-
-void getopt::add_opt(int short_opt, char const *long_opt, bool has_arg)
-{
-    getopt_private::optdesc o { long_opt, has_arg, nullptr, short_opt };
-    m_private->m_opts.push(o);
-
-    /* “The standards require that the argument [to isalnum()] is either
-     * EOF or a value that is representable in the type unsigned char.” */
-    if ((int)(unsigned char)short_opt == short_opt && isalnum(short_opt))
-    {
-        m_private->m_optstring += (char)short_opt;
-        if (has_arg)
-            m_private->m_optstring += ':';
-    }
-}
-
-int getopt::parse()
-{
-    int longindex = 0; // FIXME: what is this?
-
-#if HAVE_GETOPT_LONG
-    int ret;
-    optind = this->index;
-    optarg = this->arg;
-    m_private->m_opts.push(getopt_private::optdesc { nullptr, 0, nullptr, 0 });
-    ret = getopt_long(m_private->m_argc, m_private->m_argv, m_private->m_optstring.c_str(),
-                      (option const *)m_private->m_opts.data(), &longindex);
-    this->index = optind;
-    this->arg = optarg;
-    return ret;
-
-#else
-    /* XXX: this getopt_long implementation should not be trusted for other
-     * applications without any serious peer reviewing. It “just works” with
-     * zzuf and a few libcaca programs but may fail miserably in other
-     * programs. */
-    char **argv = (char **)(uintptr_t)m_private->m_argv;
-    char *flag;
-
-    if (this->index >= m_private->m_argc)
-        return -1;
-
-    flag = argv[this->index];
-
-    if (flag[0] == '-' && flag[1] != '-')
-    {
-        char const *tmp;
-        int ret = flag[1];
-
-        if (ret == '\0')
-            return -1;
-
-        tmp = strchr(m_private->m_optstring.c_str(), ret);
-        if (!tmp || ret == ':')
-            return '?';
-
-        ++this->index;
-        if (tmp[1] == ':')
-        {
-            if (flag[2] != '\0')
-                this->arg = flag + 2;
-            else
-            {
-                if (this->index >= m_private->m_argc)
-                    goto too_few;
-                this->arg = argv[this->index++];
-            }
-            return ret;
-        }
-
-        if (flag[2] != '\0')
-        {
-            flag[1] = '-';
-            --this->index;
-            ++argv[this->index];
-        }
-
-        return ret;
-    }
-
-    if (flag[0] == '-' && flag[1] == '-')
-    {
-        if (flag[2] == '\0')
-            return -1;
-
-        for (int i = 0; m_private->m_opts[i].name; ++i)
-        {
-            size_t l = strlen(m_private->m_opts[i].name);
-
-            if (strncmp(flag + 2, m_private->m_opts[i].name, l))
-                continue;
-
-            switch (flag[2 + l])
-            {
-            case '=':
-                if (!m_private->m_opts[i].has_arg)
-                    goto bad_opt;
-                longindex = i;
-                ++this->index;
-                this->arg = flag + 2 + l + 1;
-                return m_private->m_opts[i].val;
-            case '\0':
-                longindex = i;
-                ++this->index;
-                if (m_private->m_opts[i].has_arg)
-                {
-                    if (this->index >= m_private->m_argc)
-                        goto too_few;
-                    this->arg = argv[this->index++];
-                }
-                return m_private->m_opts[i].val;
-            default:
-                break;
-            }
-        }
-    bad_opt:
-        fprintf(stderr, "%s: unrecognized option `%s'\n", argv[0], flag);
-        return '?';
-
-    too_few:
-        fprintf(stderr, "%s: option `%s' requires an argument\n",
-                argv[0], flag);
-        return '?';
-    }
-
-    return -1;
-#endif
-}
-
-} // namespace lol
-