GUI: add audio load meter to statistics

TODO.md

@@ -28,6 +28,5 @@
 - store edit/followOrders/followPattern state in config
 - add ability to select a column by double clicking
 - add ability to move selection by dragging
-- settings: OK/Cancel buttons should be always visible
 - Apply button in settings
 - find and replace

src/engine/engine.h

@@ -26,6 +26,7 @@
 #include "safeWriter.h"
 #include "../audio/taAudio.h"
 #include "blip_buf.h"
+#include <atomic>
 #include <functional>
 #include <initializer_list>
 #include <thread>
@@ -416,6 +417,7 @@ class DivEngine {
     float oscSize;
     int oscReadPos, oscWritePos;
     int tickMult;
+    std::atomic<size_t> processTime;
 
     void runExportThread();
     void nextBuf(float** in, float** out, int inChans, int outChans, unsigned int size);
@@ -923,7 +925,8 @@ class DivEngine {
       oscSize(1),
       oscReadPos(0),
       oscWritePos(0),
-      tickMult(1) {
+      tickMult(1),
+      processTime(0) {
       memset(isMuted,0,DIV_MAX_CHANS*sizeof(bool));
       memset(keyHit,0,DIV_MAX_CHANS*sizeof(bool));
       memset(dispatchChanOfChan,0,DIV_MAX_CHANS*sizeof(int));

src/engine/playback.cpp

@@ -17,6 +17,7 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
+#include <chrono>
 #define _USE_MATH_DEFINES
 #include "dispatch.h"
 #include "engine.h"
@@ -1060,6 +1061,8 @@ void DivEngine::nextBuf(float** in, float** out, int inChans, int outChans, unsi
   }
   got.bufsize=size;
 
+  std::chrono::steady_clock::time_point ts_processBegin=std::chrono::steady_clock::now();
+
   // process MIDI events (TODO: everything)
   if (output) if (output->midiIn) while (!output->midiIn->queue.empty()) {
     TAMidiMessage& msg=output->midiIn->queue.front();
@@ -1338,4 +1341,8 @@ void DivEngine::nextBuf(float** in, float** out, int inChans, int outChans, unsi
     }
   }
   isBusy.unlock();
+
+  std::chrono::steady_clock::time_point ts_processEnd=std::chrono::steady_clock::now();
+
+  processTime=std::chrono::duration_cast<std::chrono::nanoseconds>(ts_processEnd-ts_processBegin).count();
 }

src/gui/stats.cpp

@@ -19,6 +19,7 @@
 
 #include "gui.h"
 #include <fmt/printf.h>
+#include <imgui.h>
 
 void FurnaceGUI::drawStats() {
   if (nextWindow==GUI_WINDOW_STATS) {
@@ -28,6 +29,13 @@ void FurnaceGUI::drawStats() {
   }
   if (!statsOpen) return;
   if (ImGui::Begin("Statistics",&statsOpen)) {
+    size_t lastProcTime=e->processTime;
+    double maxGot=1000000000.0*(double)e->getAudioDescGot().bufsize/(double)e->getAudioDescGot().rate;
+    String procStr=fmt::sprintf("%.1f%%",100.0*((double)lastProcTime/(double)maxGot));
+    ImGui::Text("Audio load");
+    ImGui::SameLine();
+    ImGui::ProgressBar((double)lastProcTime/maxGot,ImVec2(-FLT_MIN,0),procStr.c_str());
+    ImGui::Separator();
     for (int i=0; i<e->song.systemLen; i++) {
       DivDispatch* dispatch=e->getDispatch(i);
       for (int j=0; dispatch!=NULL && dispatch->getSampleMemCapacity(j)>0; j++) {