182 lines
7.3 KiB
C++
182 lines
7.3 KiB
C++
/**
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* Furnace Tracker - multi-system chiptune tracker
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* Copyright (C) 2021-2025 tildearrow and contributors
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#define _USE_MATH_DEFINES
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#include "gui.h"
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#include "guiConst.h"
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#include "imgui.h"
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#include "imgui_internal.h"
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#include "misc/cpp/imgui_stdlib.h"
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#define FURNACE_TUNER_FFT_SIZE 16384
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void FurnaceGUI::drawTuner() {
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if (nextWindow==GUI_WINDOW_TUNER) {
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tunerOpen=true;
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ImGui::SetNextWindowFocus();
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nextWindow=GUI_WINDOW_NOTHING;
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}
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if (!tunerOpen) return;
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if (ImGui::Begin("Tuner",&tunerOpen,globalWinFlags|ImGuiWindowFlags_NoScrollbar,_("Tuner"))) {
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// fft buffer
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if (!tunerFFTInBuf) tunerFFTInBuf=new double[FURNACE_TUNER_FFT_SIZE];
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if (!tunerFFTOutBuf) tunerFFTOutBuf=(fftw_complex*)fftw_malloc(sizeof(fftw_complex)*FURNACE_TUNER_FFT_SIZE);
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if (!tunerPlan) {
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tunerPlan=fftw_plan_dft_r2c_1d(FURNACE_TUNER_FFT_SIZE,tunerFFTInBuf,tunerFFTOutBuf,FFTW_ESTIMATE);
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}
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int chans=e->getAudioDescGot().outChans;
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int needle=e->oscReadPos;
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for (int j=0; j<FURNACE_TUNER_FFT_SIZE; j++) {
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int pos=(needle-FURNACE_TUNER_FFT_SIZE+j)&0x7fff;
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double sample=0.0;
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for (int ch=0; ch<chans; ch++) {
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sample+=e->oscBuf[ch][pos];
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}
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sample=sample/chans;
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tunerFFTInBuf[j]=sample*(0.5*(1.0-cos(2.0*M_PI*j/(FURNACE_TUNER_FFT_SIZE-1))));
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}
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fftw_execute(tunerPlan);
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std::vector<double> mag(FURNACE_TUNER_FFT_SIZE/2);
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mag[0]=0;
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mag[1]=0;
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mag[2]=0;
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mag[3]=0; // skip some of the low frequencies
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for (int k=4; k<FURNACE_TUNER_FFT_SIZE/2; k++) {
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mag[k]=sqrt(tunerFFTOutBuf[k][0]*tunerFFTOutBuf[k][0]+tunerFFTOutBuf[k][1]*tunerFFTOutBuf[k][1]);
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}
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// harmonic product spectrum
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int harmonics=1; // disabled for now...
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for (int h=2; h<=harmonics; h++) {
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for (int k=8; k<FURNACE_TUNER_FFT_SIZE/(2*h); k++) {
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mag[k]*=mag[k*h];
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}
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}
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double sampleRate=e->getAudioDescGot().rate;
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// peak with interpolation
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int peakIndex=std::distance(mag.begin(),std::max_element(mag.begin(),mag.end()));
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double freq=0.0;
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if (peakIndex>0 && peakIndex<(int)mag.size()-1) {
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double alpha=mag[peakIndex-1];
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double beta=mag[peakIndex];
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double gamma=mag[peakIndex+1];
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double p=0.5*(alpha-gamma)/(alpha-2.0*beta+gamma);
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freq=(peakIndex+p)*(sampleRate/(double)FURNACE_TUNER_FFT_SIZE);
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} else {
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freq=(double)peakIndex*(sampleRate/(double)FURNACE_TUNER_FFT_SIZE);
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}
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// tuning formulas
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double noteExact=0.0;
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int noteRounded=0;
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double cents=0.0f;
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String noteText="---", subtext="";
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if (freq>0 && freq<5000.0) {
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noteExact=CLAMP(log2(freq/e->song.tuning)*12.0+117.0,0,180);
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noteRounded=round(noteExact);
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cents=(noteExact-noteRounded);
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noteText=fmt::sprintf("%s",noteName(noteRounded));
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subtext=fmt::sprintf("%3.3f Hz %dc",freq,(int)(cents*100.0f));
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}
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{
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ImDrawList* dl=ImGui::GetWindowDrawList();
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ImVec2 origin=ImGui::GetWindowPos();
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ImVec2 size=ImGui::GetWindowSize();
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float titleBar=ImGui::GetCurrentWindow()->TitleBarHeight;
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origin.y+=titleBar;
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size.y-=titleBar;
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// debug stuff
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// ImVec2* plot=new ImVec2[FURNACE_TUNER_FFT_SIZE];
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// for (size_t i=0; i<FURNACE_TUNER_FFT_SIZE; i++) {
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// plot[i].x=origin.x+size.x*(float)i/FURNACE_TUNER_FFT_SIZE;
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// plot[i].y=origin.y+size.y-size.y*(tunerFFTInBuf[i]+1.0f)/2.0f;
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// }
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// dl->AddPolyline(plot, FURNACE_TUNER_FFT_SIZE, 0xff00ff00, 0, 1.0f);
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// for (size_t i=0; i<mag.size(); i++) {
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// plot[i].x=origin.x+size.x*scaleFuncLog((float)i/mag.size());
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// plot[i].y=origin.y+size.y-size.y*(mag[i]/FURNACE_TUNER_FFT_SIZE);
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// }
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// dl->AddPolyline(plot, mag.size(), 0xffffffff, 0, 1.0f);
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// dl->AddLine(origin+ImVec2(size.x*scaleFuncLog((double)peakIndex/(mag.size()-1)),0),origin+ImVec2(size.x*scaleFuncLog((double)peakIndex/(mag.size()-1)),size.y), 0xff000fff);
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// delete[] plot;
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const float boxHeight=20.0f*dpiScale;
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const float needleHeight=18.0f*dpiScale;
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ImU32 lowColor=ImGui::GetColorU32(uiColors[GUI_COLOR_TUNER_SCALE_LOW]);
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ImU32 highColor=ImGui::GetColorU32(uiColors[GUI_COLOR_TUNER_SCALE_HIGH]);
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// needle bg
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ImGui::Dummy(ImVec2(size.x,boxHeight));
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dl->AddRectFilledMultiColor(origin,origin+ImVec2(size.x/2.0f,boxHeight),highColor,lowColor,lowColor,highColor);
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dl->AddRectFilledMultiColor(origin+ImVec2(size.x/2.0f,0),origin+ImVec2(size.x,boxHeight),lowColor,highColor,highColor,lowColor);
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dl->AddLine(origin+ImVec2(size.x/2.0f,0),origin+ImVec2(size.x/2.0f,boxHeight),ImGui::GetColorU32(uiColors[GUI_COLOR_TUNER_NEEDLE]),2.0f*dpiScale);
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// needle
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float needleX=size.x*(0.5f+cents);
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dl->AddLine(origin+ImVec2(needleX,boxHeight-needleHeight),origin+ImVec2(needleX,needleHeight),ImGui::GetColorU32(uiColors[GUI_COLOR_TUNER_NEEDLE]),4.0f*dpiScale);
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// text
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ImGui::PushFont(bigFont);
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ImVec2 textSize=ImGui::CalcTextSize(noteText.c_str());
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ImGui::SetCursorPosX((size.x-textSize.x)/2.0f);
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ImGui::TextUnformatted(noteText.c_str());
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ImGui::PopFont();
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textSize=ImGui::CalcTextSize(subtext.c_str());
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ImGui::SetCursorPosX((size.x-textSize.x)/2.0f);
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ImGui::TextUnformatted(subtext.c_str());
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// piano
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int noteMod=noteRounded%12;
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ImVec2 pianoPos=ImGui::GetCursorScreenPos();
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pianoPos.x=ImGui::GetWindowPos().x;
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ImVec2 pianoSize=ImVec2(ImGui::GetWindowSize().x,ImGui::GetContentRegionAvail().y);
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if (pianoSize.y>1.0f) {
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float keySize=pianoSize.x/7.0f;
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for (int i=0; i<7; i++) {
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dl->AddRectFilled(
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pianoPos+ImVec2(keySize*i,0),
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pianoPos+ImVec2(keySize*(i+1),pianoSize.y),
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ImGui::GetColorU32(uiColors[(noteRounded && bottomKeyNotes[i]==noteMod)?GUI_COLOR_PIANO_KEY_BOTTOM_HIT:GUI_COLOR_PIANO_KEY_BOTTOM]));
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dl->AddLine(
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pianoPos+ImVec2(keySize*i,0),
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pianoPos+ImVec2(keySize*i,pianoSize.y),
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ImGui::GetColorU32(uiColors[GUI_COLOR_PIANO_BACKGROUND]),
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dpiScale);
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}
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for (int i=0; i<5; i++) {
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dl->AddRectFilled(
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pianoPos+ImVec2(pianoSize.x*topKeyStarts[i]-keySize/3.0f,0),
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pianoPos+ImVec2(pianoSize.x*topKeyStarts[i]+keySize/3.0f,2.0f*pianoSize.y/3.0f),
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ImGui::GetColorU32(uiColors[(noteRounded && topKeyNotes[i]==noteMod)?GUI_COLOR_PIANO_KEY_TOP_HIT:GUI_COLOR_PIANO_KEY_TOP]));
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}
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ImGui::Dummy(pianoSize);
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}
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}
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}
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if (ImGui::IsWindowFocused(ImGuiFocusedFlags_ChildWindows))
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curWindow=GUI_WINDOW_TUNER;
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ImGui::End();
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}
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