change to draw body first

Using std::list to store what needs to be drawn

main.cpp

@@ -1,6 +1,7 @@
 #include <cmath>
 #include <vector>
 #include <cstdint>
+#include <list>
 #include "raylib.h"
 #include "raymath.h"
 
@@ -9,12 +10,10 @@
 Color ColorLerp(Color c1, Color c2, float amount)
 {
   Color ret{0};
-
   ret.r = Clamp(Lerp(c1.r, c2.r, amount), 0, 255);
   ret.g = Clamp(Lerp(c1.g, c2.g, amount), 0, 255);
   ret.b = Clamp(Lerp(c1.b, c2.b, amount), 0, 255);
   ret.a = Clamp(Lerp(c1.a, c2.a, amount), 0, 255);
-
   return ret;
 }
 
@@ -23,7 +22,16 @@ struct branch
   Color color;
 };
 
+struct draw_args
+{
+  Vector2 start;
+  float angleDeg;
+  float lenghth;
+  int dep;
+};
+
 static std::vector<branch> tree(MAX_DEPTH);
+static std::list<draw_args> draw_calls;
 
 Vector2 draw_line(Vector2 start, float angleDeg, float lenghth, int dep)
 {
@@ -45,16 +53,27 @@ Vector2 draw_line(Vector2 start, float angleDeg, float lenghth, int dep)
   return end;
 }
 
-void draw_branch(Vector2 start, float angle, float len, int dep)
+void draw_branch(draw_args arg)
 {
-  if (dep >= MAX_DEPTH)
+  if (arg.dep >= MAX_DEPTH)
     return;
 
-  Vector2 next = draw_line(start, angle, len, dep);
+  Vector2 next = draw_line(arg.start, arg.angleDeg, arg.lenghth, arg.dep);
 
   float next_len = 0.7f;
-  draw_branch(next, angle + 45, len * next_len, dep + 1);
+  draw_calls.push_back((draw_args){next, arg.angleDeg + 45, arg.lenghth * next_len, arg.dep + 1});
-  draw_branch(next, angle - 45, len * next_len, dep + 1);
+  draw_calls.push_back((draw_args){next, arg.angleDeg - 45, arg.lenghth * next_len, arg.dep + 1});
+}
+
+void draw_tree(draw_args first)
+{
+  draw_calls.push_back(first);
+
+  while (!draw_calls.empty())
+  {
+    draw_branch(draw_calls.front());
+    draw_calls.pop_front();
+  }
 }
 
 void generate_tree()
@@ -89,7 +108,7 @@ int main(void)
 
   BeginTextureMode(target);
   ClearBackground(WHITE);
-  draw_branch(start, 0, textureHeight / 4, 1);
+  draw_tree((draw_args){start, 0, textureHeight / 4, 1});
   EndTextureMode();
 
   Rectangle source = {0, 0, (float)target.texture.width, (float)-target.texture.height};