From 7a05f902ea2061440ef60a7676218389422e0770 Mon Sep 17 00:00:00 2001
From: tildearrow <tildearrow@protonmail.com>
Date: Tue, 15 Feb 2022 18:52:12 -0500
Subject: [PATCH] i need to go

---
 src/gui/gui.cpp | 48 +++++++++++++++++++++++++++++++++++++++++++++++-
 src/gui/gui.h   | 19 +++++++++++++++++++
 2 files changed, 66 insertions(+), 1 deletion(-)

diff --git a/src/gui/gui.cpp b/src/gui/gui.cpp
index a2a28987..c929fc21 100644
--- a/src/gui/gui.cpp
+++ b/src/gui/gui.cpp
@@ -169,6 +169,18 @@ const char* pitchLabel[11]={
 
 String getHomeDir();
 
+ImU32 partTest[256];
+
+bool Particle::update() {
+  pos.x+=speed.x;
+  pos.y+=speed.y;
+  speed.x*=friction;
+  speed.y*=friction;
+  speed.y+=gravity;
+  life-=lifeSpeed;
+  return (life>0);
+}
+
 void FurnaceGUI::bindEngine(DivEngine* eng) {
   e=eng;
 }
@@ -3511,9 +3523,24 @@ void FurnaceGUI::drawPattern() {
         DivChannelState* ch=e->getChanState(i);
         if (ch->portaSpeed>0) {
           ImVec4 col=uiColors[GUI_COLOR_PATTERN_EFFECT_PITCH];
-          col.w*=0.3;
+          col.w*=0.2;
           float width=patChanX[i+1]-patChanX[i];
 
+          if (e->isPlaying()) {
+            particles.push_back(Particle(
+              partTest,
+              (ch->portaNote<=ch->note)?ICON_FA_CHEVRON_DOWN:ICON_FA_CHEVRON_UP,
+              off.x+patChanX[i]+fmod(rand(),width),
+              off.y+fmod(rand(),MAX(1,ImGui::GetWindowHeight())),
+              0.0f,
+              (7.0f+(rand()%5)+ch->portaSpeed)*((ch->portaNote<=ch->note)?1:-1),
+              0.0f,
+              1.0f,
+              255.0f,
+              18.0f
+            ));
+          }
+
           for (float j=-patChanSlideY[i]; j<ImGui::GetWindowHeight(); j+=width*0.7) {
             ImVec2 tMin=ImVec2(off.x+patChanX[i],off.y+j);
             ImVec2 tMax=ImVec2(off.x+patChanX[i+1],off.y+j+width*0.6);
@@ -3547,6 +3574,21 @@ void FurnaceGUI::drawPattern() {
           }
         }
       }
+
+      // particle simulation
+      for (size_t i=0; i<particles.size(); i++) {
+        Particle& part=particles[i];
+        if (part.update()) {
+          dl->AddText(
+            part.pos,
+            part.colors[(int)part.life],
+            part.type
+          );
+        } else {
+          particles.erase(particles.begin()+i);
+          i--;
+        }
+      }
     }
 
     ImGui::PopStyleColor(3);
@@ -8425,6 +8467,10 @@ void FurnaceGUI::applyUISettings() {
 
   ImGui::GetStyle()=sty;
 
+  for (int i=0; i<256; i++) {
+    partTest[i]=ImGui::GetColorU32(ImVec4(1.0f,1.0f,1.0f,(float)i/255.0f));
+  }
+
   // set to 800 for now due to problems with unifont
   static const ImWchar loadEverything[]={0x20,0x800,0};
 
diff --git a/src/gui/gui.h b/src/gui/gui.h
index 487d0fc4..f7c9c23c 100644
--- a/src/gui/gui.h
+++ b/src/gui/gui.h
@@ -365,6 +365,23 @@ struct UndoStep {
   std::vector<UndoPatternData> pat;
 };
 
+struct Particle {
+  ImU32* colors;
+  const char* type;
+  ImVec2 pos, speed;
+  float gravity, friction, life, lifeSpeed;
+  bool update();
+  Particle(ImU32* color, const char* ty, float x, float y, float sX, float sY, float g, float fr, float l, float lS):
+    colors(color),
+    type(ty),
+    pos(x,y),
+    speed(sX,sY),
+    gravity(g),
+    friction(fr),
+    life(l),
+    lifeSpeed(lS) {}
+};
+
 class FurnaceGUI {
   DivEngine* e;
 
@@ -515,6 +532,8 @@ class FurnaceGUI {
   };
   std::vector<ActiveNote> activeNotes;
 
+  std::vector<Particle> particles;
+
   bool wavePreviewOn;
   SDL_Scancode wavePreviewKey;
   int wavePreviewNote;