Merge pull request #1622 from LeviathaninWaves/crossfade-loop-points

Crossfade loop points

src/gui/doAction.cpp

@@ -1336,6 +1336,10 @@ void FurnaceGUI::doAction(int what) {
       MARK_MODIFIED;
       break;
     }
+    case GUI_ACTION_SAMPLE_CROSSFADE_LOOP:
+      if (curSample<0 || curSample>=(int)e->song.sample.size()) break;
+      openSampleCrossFadeOpt=true;
+      break;
     case GUI_ACTION_SAMPLE_FILTER:
       if (curSample<0 || curSample>=(int)e->song.sample.size()) break;
       openSampleFilterOpt=true;

src/gui/gui.cpp

@@ -7570,6 +7570,8 @@ FurnaceGUI::FurnaceGUI():
   sampleFilterRes(0.25f),
   sampleFilterCutStart(16000.0f),
   sampleFilterCutEnd(100.0f),
+  sampleCrossFadeLoopLength(0),
+  sampleCrossFadeLoopLaw(50),
   sampleFilterPower(1),
   sampleClipboard(NULL),
   sampleClipboardLen(0),
@@ -7578,6 +7580,7 @@ FurnaceGUI::FurnaceGUI():
   openSampleAmplifyOpt(false),
   openSampleSilenceOpt(false),
   openSampleFilterOpt(false),
+  openSampleCrossFadeOpt(false),
   selectedPortSet(0x1fff),
   selectedSubPort(-1),
   hoveredPortSet(0x1fff),

src/gui/gui.h

@@ -723,6 +723,7 @@ enum FurnaceGUIActions {
   GUI_ACTION_SAMPLE_INVERT,
   GUI_ACTION_SAMPLE_SIGN,
   GUI_ACTION_SAMPLE_FILTER,
+  GUI_ACTION_SAMPLE_CROSSFADE_LOOP,
   GUI_ACTION_SAMPLE_PREVIEW,
   GUI_ACTION_SAMPLE_STOP_PREVIEW,
   GUI_ACTION_SAMPLE_ZOOM_IN,
@@ -2104,10 +2105,11 @@ class FurnaceGUI {
   ImVec2 sampleDragAreaSize;
   unsigned int sampleDragLen;
   float sampleFilterL, sampleFilterB, sampleFilterH, sampleFilterRes, sampleFilterCutStart, sampleFilterCutEnd;
+  int sampleCrossFadeLoopLength, sampleCrossFadeLoopLaw;
   unsigned char sampleFilterPower;
   short* sampleClipboard;
   size_t sampleClipboardLen;
-  bool openSampleResizeOpt, openSampleResampleOpt, openSampleAmplifyOpt, openSampleSilenceOpt, openSampleFilterOpt;
+  bool openSampleResizeOpt, openSampleResampleOpt, openSampleAmplifyOpt, openSampleSilenceOpt, openSampleFilterOpt, openSampleCrossFadeOpt;
 
   // mixer
   // 0xxx: output

src/gui/guiConst.cpp

@@ -743,6 +743,7 @@ const FurnaceGUIActionDef guiActions[GUI_ACTION_MAX]={
   D("SAMPLE_INVERT", "Invert", FURKMOD_CMD|FURKMOD_SHIFT|SDLK_t),
   D("SAMPLE_SIGN", "Signed/unsigned exchange", FURKMOD_CMD|SDLK_u),
   D("SAMPLE_FILTER", "Apply filter", FURKMOD_CMD|SDLK_f),
+  D("SAMPLE_CROSSFADE_LOOP", "Crossfade loop points", NOT_AN_ACTION),
   D("SAMPLE_PREVIEW", "Preview sample", 0),
   D("SAMPLE_STOP_PREVIEW", "Stop sample preview", 0),
   D("SAMPLE_ZOOM_IN", "Zoom in", FURKMOD_CMD|SDLK_EQUALS),

src/gui/sampleEdit.cpp

@@ -1226,6 +1226,74 @@ void FurnaceGUI::drawSampleEdit() {
       ImGui::SameLine();
       ImGui::Dummy(ImVec2(4.0*dpiScale,dpiScale));
       sameLineMaybe();
+      ImGui::Button(ICON_FUR_CROSSFADE "##CrossFade");
+      if (ImGui::IsItemHovered()) {
+        ImGui::SetTooltip("Crossfade loop points");
+      }
+      if (openSampleCrossFadeOpt) {
+        openSampleCrossFadeOpt=false;
+        ImGui::OpenPopup("SCrossFadeOpt");
+      }
+      if (ImGui::BeginPopupContextItem("SCrossFadeOpt",ImGuiPopupFlags_MouseButtonLeft)) {
+        if (sampleCrossFadeLoopLength>sample->loopStart) sampleCrossFadeLoopLength=sample->loopStart;
+        if (sampleCrossFadeLoopLength>(sample->loopEnd-sample->loopStart)) sampleCrossFadeLoopLength=sample->loopEnd-sample->loopStart;
+        if (ImGui::SliderInt("Number of samples",&sampleCrossFadeLoopLength,0,100000)) {
+          if (sampleCrossFadeLoopLength<0) sampleCrossFadeLoopLength=0;
+          if (sampleCrossFadeLoopLength>sample->loopStart) sampleCrossFadeLoopLength=sample->loopStart;
+          if (sampleCrossFadeLoopLength>(sample->loopEnd-sample->loopStart)) sampleCrossFadeLoopLength=sample->loopEnd-sample->loopStart;
+          if (sampleCrossFadeLoopLength>100000) sampleCrossFadeLoopLength=100000;
+        }
+        if (ImGui::SliderInt("Linear <-> Equal power",&sampleCrossFadeLoopLaw,0,100)) {
+          if (sampleCrossFadeLoopLaw<0) sampleCrossFadeLoopLaw=0;
+          if (sampleCrossFadeLoopLaw>100) sampleCrossFadeLoopLaw=100;
+        }
+        if (ImGui::Button("Apply")) {
+          if (sampleCrossFadeLoopLength>sample->loopStart) {
+            showError("Crossfade: length would go out of bounds. Aborted...");
+            ImGui::CloseCurrentPopup();
+          } else if (sampleCrossFadeLoopLength>(sample->loopEnd-sample->loopStart)) {
+            showError("Crossfade: length would overflow loopStart. Try a smaller random value.");
+            ImGui::CloseCurrentPopup();
+          } else {
+            sample->prepareUndo(true);
+            e->lockEngine([this,sample] {
+              SAMPLE_OP_BEGIN;
+              double l=1.0/(double)sampleCrossFadeLoopLength;
+              double evar=1.0-sampleCrossFadeLoopLaw/200.0;
+              if (sample->depth==DIV_SAMPLE_DEPTH_8BIT) {
+                unsigned int crossFadeInput=sample->loopStart-sampleCrossFadeLoopLength;
+                unsigned int crossFadeOutput=sample->loopEnd-sampleCrossFadeLoopLength;
+                for (int i=0; i<sampleCrossFadeLoopLength; i++) {
+                  double f1=pow(i*l,evar);
+                  double f2=pow((sampleCrossFadeLoopLength-i)*l,evar);
+                  signed char out=(signed char)(((double)sample->data8[crossFadeInput])*f1+((double)sample->data8[crossFadeOutput])*f2);
+                  sample->data8[crossFadeOutput]=out;
+                  crossFadeInput++;
+                  crossFadeOutput++;
+                }
+              } else if (sample->depth==DIV_SAMPLE_DEPTH_16BIT) {
+                unsigned int crossFadeInput=sample->loopStart-sampleCrossFadeLoopLength;
+                unsigned int crossFadeOutput=sample->loopEnd-sampleCrossFadeLoopLength;
+                for (int i=0; i<sampleCrossFadeLoopLength; i++) {
+                  double f1=std::pow(i*l,evar);
+                  double f2=std::pow((sampleCrossFadeLoopLength-i)*l,evar);
+                  short out=(short)(((double)sample->data16[crossFadeInput])*f1+((double)sample->data16[crossFadeOutput])*f2);
+                  sample->data16[crossFadeOutput]=out;
+                  crossFadeInput++;
+                  crossFadeOutput++;
+                }
+              }
+              updateSampleTex=true;
+
+              e->renderSamples(curSample);
+            });
+            MARK_MODIFIED;
+            ImGui::CloseCurrentPopup();
+          }
+        }
+        ImGui::EndPopup();
+      }
+      ImGui::SameLine();
       if (ImGui::Button(ICON_FA_PLAY "##PreviewSample")) {
         e->previewSample(curSample);
       }

src/icon/furIcons.h

@@ -1,7 +1,7 @@
 // not auto-generated. update every time you change icons.ttf!
 
 #define ICON_MIN_FUR 0xe0f0
-#define ICON_MAX_FUR 0xe158
+#define ICON_MAX_FUR 0xe159
 
 // test
 #define ICON_FUR_TEST0 u8"\ue0f0"
@@ -105,4 +105,5 @@
 #define ICON_FUR_INC_LINEAR u8"\ue14b"
 #define ICON_FUR_INC_BENT u8"\ue14c"
 #define ICON_FUR_VOL_DIRECT u8"\ue14d"
-#define ICON_FUR_ADSR u8"\ue14e"
+#define ICON_FUR_ADSR u8"\ue14e"
+#define ICON_FUR_CROSSFADE u8"\ue159"