Add WIP timing stuff

thirdparty/sokol_time.h

@@ -0,0 +1,228 @@
+#pragma once
+/*
+    sokol_time.h    -- simple cross-platform time measurement
+
+    Do this:
+        #define SOKOL_IMPL
+    before you include this file in *one* C or C++ file to create the
+    implementation.
+
+    Optionally provide the following defines with your own implementations:
+    SOKOL_ASSERT(c)     - your own assert macro (default: assert(c))
+    SOKOL_API_DECL      - public function declaration prefix (default: extern)
+    SOKOL_API_IMPL      - public function implementation prefix (default: -)
+
+    void stm_setup();
+        Call once before any other functions to initialize sokol_time
+        (this calls for instance QueryPerformanceFrequency on Windows)
+
+    uint64_t stm_now();
+        Get current point in time in unspecified 'ticks'. The value that
+        is returned has no relation to the 'wall-clock' time and is
+        not in a specific time unit, it is only useful to compute
+        time differences.
+
+    uint64_t stm_diff(uint64_t new, uint64_t old);
+        Computes the time difference between new and old. This will always
+        return a positive, non-zero value.
+
+    uint64_t stm_since(uint64_t start);
+        Takes the current time, and returns the elapsed time since start
+        (this is a shortcut for "stm_diff(stm_now(), start)")
+
+    uint64_t stm_laptime(uint64_t* last_time);
+        This is useful for measuring frame time and other recurring
+        events. It takes the current time, returns the time difference
+        to the value in last_time, and stores the current time in
+        last_time for the next call. If the value in last_time is 0,
+        the return value will be zero (this usually happens on the
+        very first call).
+
+    Use the following functions to convert a duration in ticks into
+    useful time units:
+
+    double stm_sec(uint64_t ticks);
+    double stm_ms(uint64_t ticks);
+    double stm_us(uint64_t ticks);
+    double stm_ns(uint64_t ticks);
+        Converts a tick value into seconds, milliseconds, microseconds
+        or nanoseconds. Note that not all platforms will have nanosecond
+        or even microsecond precision.
+
+    Uses the following time measurement functions under the hood:
+
+    Windows:        QueryPerformanceFrequency() / QueryPerformanceCounter()
+    MacOS/iOS:      mach_absolute_time()
+    emscripten:     clock_gettime(CLOCK_MONOTONIC)
+    Linux+others:   clock_gettime(CLOCK_MONITONIC)
+
+    zlib/libpng license
+
+    Copyright (c) 2018 Andre Weissflog
+
+    This software is provided 'as-is', without any express or implied warranty.
+    In no event will the authors be held liable for any damages arising from the
+    use of this software.
+
+    Permission is granted to anyone to use this software for any purpose,
+    including commercial applications, and to alter it and redistribute it
+    freely, subject to the following restrictions:
+
+        1. The origin of this software must not be misrepresented; you must not
+        claim that you wrote the original software. If you use this software in a
+        product, an acknowledgment in the product documentation would be
+        appreciated but is not required.
+
+        2. Altered source versions must be plainly marked as such, and must not
+        be misrepresented as being the original software.
+
+        3. This notice may not be removed or altered from any source
+        distribution.
+*/
+#include <stdint.h>
+
+#ifndef SOKOL_API_DECL
+    #define SOKOL_API_DECL extern
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+SOKOL_API_DECL void stm_setup(void);
+SOKOL_API_DECL uint64_t stm_now(void);
+SOKOL_API_DECL uint64_t stm_diff(uint64_t new_ticks, uint64_t old_ticks);
+SOKOL_API_DECL uint64_t stm_since(uint64_t start_ticks);
+SOKOL_API_DECL uint64_t stm_laptime(uint64_t* last_time);
+SOKOL_API_DECL double stm_sec(uint64_t ticks);
+SOKOL_API_DECL double stm_ms(uint64_t ticks);
+SOKOL_API_DECL double stm_us(uint64_t ticks);
+SOKOL_API_DECL double stm_ns(uint64_t ticks);
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif
+
+/*-- IMPLEMENTATION ----------------------------------------------------------*/
+#ifdef SOKOL_IMPL
+
+#ifndef SOKOL_API_IMPL
+    #define SOKOL_API_IMPL
+#endif
+#ifndef SOKOL_ASSERT
+    #include <assert.h>
+    #define SOKOL_ASSERT(c) assert(c)
+#endif
+#ifndef _SOKOL_PRIVATE
+    #if defined(__GNUC__)
+        #define _SOKOL_PRIVATE __attribute__((unused)) static
+    #else
+        #define _SOKOL_PRIVATE static
+    #endif
+#endif
+
+static int _stm_initialized;
+#if defined(_WIN32)
+#ifndef WIN32_LEAN_AND_MEAN
+#define WIN32_LEAN_AND_MEAN
+#endif
+#include <windows.h>
+static LARGE_INTEGER _stm_win_freq;
+static LARGE_INTEGER _stm_win_start;
+#elif defined(__APPLE__) && defined(__MACH__)
+#include <mach/mach_time.h>
+static mach_timebase_info_data_t _stm_osx_timebase;
+static uint64_t _stm_osx_start;
+#else /* anything else, this will need more care for non-Linux platforms */
+#include <time.h>
+static uint64_t _stm_posix_start;
+#endif
+
+/* prevent 64-bit overflow when computing relative timestamp
+    see https://gist.github.com/jspohr/3dc4f00033d79ec5bdaf67bc46c813e3
+*/
+#if defined(_WIN32) || (defined(__APPLE__) && defined(__MACH__))
+_SOKOL_PRIVATE int64_t int64_muldiv(int64_t value, int64_t numer, int64_t denom) {
+    int64_t q = value / denom;
+    int64_t r = value % denom;
+    return q * numer + r * numer / denom;
+}
+#endif
+
+
+SOKOL_API_IMPL void stm_setup(void) {
+    SOKOL_ASSERT(0 == _stm_initialized);
+    _stm_initialized = 1;
+    #if defined(_WIN32)
+        QueryPerformanceFrequency(&_stm_win_freq);
+        QueryPerformanceCounter(&_stm_win_start);
+    #elif defined(__APPLE__) && defined(__MACH__)
+        mach_timebase_info(&_stm_osx_timebase);
+        _stm_osx_start = mach_absolute_time();
+    #else
+        struct timespec ts;
+        clock_gettime(CLOCK_MONOTONIC, &ts);
+        _stm_posix_start = (uint64_t)ts.tv_sec*1000000000 + (uint64_t)ts.tv_nsec;
+    #endif
+}
+
+SOKOL_API_IMPL uint64_t stm_now(void) {
+    SOKOL_ASSERT(_stm_initialized);
+    uint64_t now;
+    #if defined(_WIN32)
+        LARGE_INTEGER qpc_t;
+        QueryPerformanceCounter(&qpc_t);
+        now = int64_muldiv(qpc_t.QuadPart - _stm_win_start.QuadPart, 1000000000, _stm_win_freq.QuadPart);
+    #elif defined(__APPLE__) && defined(__MACH__)
+        const uint64_t mach_now = mach_absolute_time() - _stm_osx_start;
+        now = int64_muldiv(mach_now, _stm_osx_timebase.numer, _stm_osx_timebase.denom);
+    #else
+        struct timespec ts;
+        clock_gettime(CLOCK_MONOTONIC, &ts);
+        now = ((uint64_t)ts.tv_sec*1000000000 + (uint64_t)ts.tv_nsec) - _stm_posix_start;
+    #endif
+    return now;
+}
+
+SOKOL_API_IMPL uint64_t stm_diff(uint64_t new_ticks, uint64_t old_ticks) {
+    if (new_ticks > old_ticks) {
+        return new_ticks - old_ticks;
+    }
+    else {
+        /* FIXME: this should be a value that converts to a non-null double */
+        return 1;
+    }
+}
+
+SOKOL_API_IMPL uint64_t stm_since(uint64_t start_ticks) {
+    return stm_diff(stm_now(), start_ticks);
+}
+
+SOKOL_API_IMPL uint64_t stm_laptime(uint64_t* last_time) {
+    SOKOL_ASSERT(last_time);
+    uint64_t dt = 0;
+    uint64_t now = stm_now();
+    if (0 != *last_time) {
+        dt = stm_diff(now, *last_time);
+    }
+    *last_time = now;
+    return dt;
+}
+
+SOKOL_API_IMPL double stm_sec(uint64_t ticks) {
+    return (double)ticks / 1000000000.0;
+}
+
+SOKOL_API_IMPL double stm_ms(uint64_t ticks) {
+    return (double)ticks / 1000000.0;
+}
+
+SOKOL_API_IMPL double stm_us(uint64_t ticks) {
+    return (double)ticks / 1000.0;
+}
+
+SOKOL_API_IMPL double stm_ns(uint64_t ticks) {
+    return (double)ticks;
+}
+#endif /* SOKOL_IMPL */
+

tool

@@ -231,14 +231,22 @@ build_target() {
       # if we ever need newer posix stuff
       # add cc_flags -D_POSIX_C_SOURCE=200809L
       out_exe=orca
-      if [[ $os = mac ]]; then
-        # prefer homebrew version of ncurses if installed. Will give us better
-        # terminfo, so we can use A_DIM in Terminal.app, etc.
+      case $os in
+        mac)
+          # prefer homebrew version of ncurses if installed. Will give us
+          # better terminfo, so we can use A_DIM in Terminal.app, etc.
           if [[ -d /usr/local/opt/ncurses ]]; then
             add libraries -L/usr/local/opt/ncurses/lib
             add cc_flags -I/usr/local/opt/ncurses/include
           fi
-      fi
+          # todo mach time stuff for mac
+        ;;
+        *)
+          # librt and high-res posix timers on Linux
+          add libraries -lrt
+          add cc_flags -D_POSIX_C_SOURCE=200809L
+        ;;
+      esac
       add libraries -lncurses
       # If we wanted wide chars, use -lncursesw on Linux, and still just
       # -lncurses on Mac.

tui_main.c

@@ -8,6 +8,10 @@
 #include <locale.h>
 #include <ncurses.h>
 
+#define SOKOL_IMPL
+#include "thirdparty/sokol_time.h"
+#undef SOKOL_IMPL
+
 #define AND_CTRL(c) ((c)&037)
 
 static void usage() {
@@ -497,6 +501,9 @@ int main(int argc, char** argv) {
     return 1;
   }
 
+  // Set up timer lib
+  stm_setup();
+
   Field field;
   if (input_file) {
     field_init(&field);
@@ -601,6 +608,7 @@ int main(int argc, char** argv) {
   bool is_playing = false;
   bool needs_remarking = true;
   bool draw_event_list = false;
+  double bpm = 120.0;
   for (;;) {
     int term_height = getmaxy(stdscr);
     int term_width = getmaxx(stdscr);