From d48801cfdea1e41fbd77c5d82f9a5ec26b106d3f Mon Sep 17 00:00:00 2001
From: tildearrow <tildearrow@protonmail.com>
Date: Tue, 14 Jun 2022 04:41:31 -0500
Subject: [PATCH] GUI: slight visualizer tweaks

---
 src/engine/engine.h     |  3 ++-
 src/engine/playback.cpp |  4 +++
 src/gui/gui.h           |  2 ++
 src/gui/pattern.cpp     | 55 ++++++++++++++++++++++++++++++++++++++---
 4 files changed, 60 insertions(+), 4 deletions(-)

diff --git a/src/engine/engine.h b/src/engine/engine.h
index dc16584de..1fa88a915 100644
--- a/src/engine/engine.h
+++ b/src/engine/engine.h
@@ -83,7 +83,7 @@ struct DivChannelState {
   int note, oldNote, lastIns, pitch, portaSpeed, portaNote;
   int volume, volSpeed, cut, rowDelay, volMax;
   int delayOrder, delayRow, retrigSpeed, retrigTick;
-  int vibratoDepth, vibratoRate, vibratoPos, vibratoDir, vibratoFine;
+  int vibratoDepth, vibratoRate, vibratoPos, vibratoPosGiant, vibratoDir, vibratoFine;
   int tremoloDepth, tremoloRate, tremoloPos;
   unsigned char arp, arpStage, arpTicks, panL, panR;
   bool doNote, legato, portaStop, keyOn, keyOff, nowYouCanStop, stopOnOff;
@@ -112,6 +112,7 @@ struct DivChannelState {
     vibratoDepth(0),
     vibratoRate(0),
     vibratoPos(0),
+    vibratoPosGiant(0),
     vibratoDir(0),
     vibratoFine(15),
     tremoloDepth(0),
diff --git a/src/engine/playback.cpp b/src/engine/playback.cpp
index ed70da94b..f8cb79ac0 100644
--- a/src/engine/playback.cpp
+++ b/src/engine/playback.cpp
@@ -988,6 +988,10 @@ bool DivEngine::nextTick(bool noAccum, bool inhibitLowLat) {
         if (chan[i].vibratoDepth>0) {
           chan[i].vibratoPos+=chan[i].vibratoRate;
           if (chan[i].vibratoPos>=64) chan[i].vibratoPos-=64;
+
+          chan[i].vibratoPosGiant+=chan[i].vibratoRate;
+          if (chan[i].vibratoPos>=512) chan[i].vibratoPos-=512;
+
           switch (chan[i].vibratoDir) {
             case 1: // up
               dispatchCmd(DivCommand(DIV_CMD_PITCH,i,chan[i].pitch+(MAX(0,(chan[i].vibratoDepth*vibTable[chan[i].vibratoPos]*chan[i].vibratoFine)>>4)/15)));
diff --git a/src/gui/gui.h b/src/gui/gui.h
index 55ea989c8..e5ad4a943 100644
--- a/src/gui/gui.h
+++ b/src/gui/gui.h
@@ -1539,6 +1539,8 @@ class FurnaceGUI {
     void addScroll(int amount);
     void setFileName(String name);
     void runBackupThread();
+    void pushPartBlend();
+    void popPartBlend();
     int processEvent(SDL_Event* ev);
     bool loop();
     bool finish();
diff --git a/src/gui/pattern.cpp b/src/gui/pattern.cpp
index fa00243c3..1d220795a 100644
--- a/src/gui/pattern.cpp
+++ b/src/gui/pattern.cpp
@@ -17,6 +17,8 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
+#include <SDL_blendmode.h>
+#include <SDL_render.h>
 #include <imgui.h>
 #define _USE_MATH_DEFINES
 #include "gui.h"
@@ -31,6 +33,30 @@ inline float randRange(float min, float max) {
   return min+((float)rand()/(float)RAND_MAX)*(max-min);
 }
 
+void _pushPartBlend(const ImDrawList* drawList, const ImDrawCmd* cmd) {
+  if (cmd!=NULL) {
+    if (cmd->UserCallbackData!=NULL) {
+      ((FurnaceGUI*)cmd->UserCallbackData)->pushPartBlend();
+    }
+  }
+}
+
+void _popPartBlend(const ImDrawList* drawList, const ImDrawCmd* cmd) {
+  if (cmd!=NULL) {
+    if (cmd->UserCallbackData!=NULL) {
+      ((FurnaceGUI*)cmd->UserCallbackData)->popPartBlend();
+    }
+  }
+}
+
+void FurnaceGUI::pushPartBlend() {
+  SDL_SetRenderDrawBlendMode(sdlRend,SDL_BLENDMODE_ADD);
+}
+
+void FurnaceGUI::popPartBlend() {
+  SDL_SetRenderDrawBlendMode(sdlRend,SDL_BLENDMODE_BLEND);
+}
+
 // draw a pattern row
 inline void FurnaceGUI::patternRow(int i, bool isPlaying, float lineHeight, int chans, int ord, const DivPattern** patCache, bool inhibitSel) {
   static char id[32];
@@ -692,11 +718,14 @@ void FurnaceGUI::drawPattern() {
         ImU32* color=noteGrad;
 
         switch (i.cmd) {
-          case DIV_CMD_NOTE_ON:
+          case DIV_CMD_NOTE_ON: {
+            float strength=CLAMP(i.value,0,119);
             partIcon=ICON_FA_ASTERISK;
-            life=96.0f;
+            life=80.0f+((i.value==DIV_NOTE_NULL)?0.0f:(strength*0.3f));
             lifeSpeed=3.0f;
+            num=6+(strength/16);
             break;
+          }
           case DIV_CMD_LEGATO:
             partIcon=ICON_FA_COG;
             color=insGrad;
@@ -794,7 +823,7 @@ void FurnaceGUI::drawPattern() {
 
       float frameTime=ImGui::GetIO().DeltaTime*60.0f;
 
-      // note slides
+      // note slides and vibrato
       ImVec2 arrowPoints[7];
       if (e->isPlaying()) for (int i=0; i<chans; i++) {
         if (!e->curSubSong->chanShow[i]) continue;
@@ -849,11 +878,30 @@ void FurnaceGUI::drawPattern() {
             }
           }
         }
+        if (ch->vibratoDepth>0) {
+          ImVec4 col=uiColors[GUI_COLOR_PATTERN_EFFECT_PITCH];
+          col.w*=0.2;
+          float width=patChanX[i+1]-patChanX[i];
+
+          particles.push_back(Particle(
+            pitchGrad,
+            ICON_FA_GLASS,
+            off.x+patChanX[i]+(width*0.5+0.5*sin(M_PI*(float)ch->vibratoPosGiant/64.0f)*width)-scrollX,
+            off.y+(ImGui::GetWindowHeight()*0.5f)+randRange(0,patFont->FontSize),
+            randRange(-4.0f,4.0f),
+            2.0f*(3.0f+(rand()%5)+ch->vibratoRate),
+            0.4f,
+            1.0f,
+            128.0f,
+            4.0f
+          ));
+        }
       }
 
       // particle simulation
       ImDrawList* fdl=ImGui::GetForegroundDrawList();
       if (!particles.empty()) WAKE_UP;
+      fdl->AddCallback(_pushPartBlend,this);
       for (size_t i=0; i<particles.size(); i++) {
         Particle& part=particles[i];
         if (part.update(frameTime)) {
@@ -870,6 +918,7 @@ void FurnaceGUI::drawPattern() {
           i--;
         }
       }
+      fdl->AddCallback(_popPartBlend,this);
     }
 
     ImGui::PopStyleColor(3);