diff --git a/cuburn/code/variations.py b/cuburn/code/variations.py
index 5952dbb..708a652 100644
--- a/cuburn/code/variations.py
+++ b/cuburn/code/variations.py
@@ -29,14 +29,14 @@ var(2, 'spherical', """
 
 var(3, 'swirl', """
     float r2 = tx*tx + ty*ty;
-    float c1 = sin(r2);
-    float c2 = cos(r2);
+    float c1 = sinf(r2);
+    float c2 = cosf(r2);
     ox += w * (c1*tx - c2*ty);
     oy += w * (c2*tx + c1*ty);
     """)
 
 var(4, 'horseshoe', """
-    float r = w / sqrt(tx*tx + ty*ty);
+    float r = w / sqrtf(tx*tx + ty*ty);
     ox += r * (tx - ty) * (tx + ty);
     oy += 2.0f * tx * ty * r;
     """)
@@ -48,53 +48,53 @@ var(5, 'polar', """
 
 var(6, 'handkerchief', """
     float a = atan2f(tx, ty);
-    float r = sqrt(tx*tx + ty*ty);
-    ox += w * r * sin(a+r);
-    oy += w * r * cos(a-r);
+    float r = sqrtf(tx*tx + ty*ty);
+    ox += w * r * sinf(a+r);
+    oy += w * r * cosf(a-r);
     """)
 
 var(7, 'heart', """
-    float sq = sqrt(tx*tx + ty*ty);
+    float sq = sqrtf(tx*tx + ty*ty);
     float a = sq * atan2f(tx, ty);
     float r = w * sq;
-    ox += r * sin(a)
-    oy -= r * cos(a)
+    ox += r * sinf(a)
+    oy -= r * cosf(a)
     """)
 
 var(8, 'disc', """
     float a = w * atan2f(tx, ty) * M_1_PI;
-    float r = M_PI * sqrt(tx*tx + ty*ty);
-    ox += sin(r) * a
-    oy += cos(r) * a 
+    float r = M_PI * sqrtf(tx*tx + ty*ty);
+    ox += sinf(r) * a
+    oy += cosf(r) * a 
     """)
 
 var(9, 'spiral', """
     float a = atan2f(tx, ty);
-    float r = sqrt(tx*tx + ty*ty);
+    float r = sqrtf(tx*tx + ty*ty);
     float r1 = w / r;
-    ox += r1 * (cos(a) + sin(r));
-    oy += r1 * (sin(a) - cos(r));
+    ox += r1 * (cosf(a) + sinf(r));
+    oy += r1 * (sinf(a) - cosf(r));
     """)
 
 var(10, 'hyperbolic', """
     float a = atan2f(tx, ty);
-    float r = sqrt(tx*tx + ty*ty);
+    float r = sqrtf(tx*tx + ty*ty);
     ox += w * sinf(a) / r;
     oy += w * cosf(a) * r;
     """)
 
 var(11, 'diamond', """
     float a = atan2f(tx, ty);
-    float r = sqrt(tx*tx + ty*ty);
-    ox += w * sin(a) * cos(r);
-    oy += w * cos(a) * sin(r);
+    float r = sqrtf(tx*tx + ty*ty);
+    ox += w * sinf(a) * cosf(r);
+    oy += w * cosf(a) * sinf(r);
     """)
 
 var(12, 'ex', """
     float a = atan2f(tx, ty);
-    float r = sqrt(tx*tx + ty*ty);
-    float n0 = sin(a+r);
-    float n1 = cos(a-r);
+    float r = sqrtf(tx*tx + ty*ty);
+    float n0 = sinf(a+r);
+    float n1 = cosf(a-r);
     float m0 = n0*n0*n0*r;
     float m1 = n1*n1*n1*r;
     ox += w * (m0 + m1);
@@ -104,9 +104,9 @@ var(12, 'ex', """
 var(13, 'julia', """
     float a = 0.5f * atan2f(tx, ty)
     if (mwc_next(rctx) & 1) a += M_PI;
-    float r = w * sqrt(tx*tx + ty*ty);
-    ox += r * cos(a);
-    oy += r * sin(a);
+    float r = w * sqrtf(tx*tx + ty*ty);
+    ox += r * cosf(a);
+    oy += r * sinf(a);
     """)
 
 var(14, 'bent', """
@@ -119,19 +119,41 @@ var(14, 'bent', """
     """)
 
 var(15, 'waves', """
-    float c10 = {{px.get(None, 'pre_yx')}};
+    float c10 = {{px.get(None, 'pre_xy')}};
     float c11 = {{px.get(None, 'pre_yy')}};
-    ox += w * (tx + c10 + sin(ty * {{px.get('xf.waves_dx2')}}));
-    oy += w * (ty + c11 + sin(tx * {{px.get('xf.waves_dy2')}}));
+    ox += w * (tx + c10 + sinf(ty * {{px.get('xf.waves_dx2')}}));
+    oy += w * (ty + c11 + sinf(tx * {{px.get('xf.waves_dy2')}}));
     """)
 
 var(16, 'fisheye', """
-    float r = sqrt(tx*tx + ty*ty);
+    float r = sqrtf(tx*tx + ty*ty);
     r = 2.0f * w / (r + 1.0f);
     ox += r * ty;
     oy += r * tx;
     """)
 
+var(17, 'popcorn', """
+    float dx = tanf(3.0f*ty);
+    float dy = tanf(3.0f*tx);
+    ox += w * (tx + {{px.get(None, 'pre_xo')}} * sinf(dx));
+    oy += w * (ty + {{px.get(None, 'pre_yo')}} * sinf(dy));
+    """)
+
+var(18, 'exponential', """
+    float dx = w * expf(tx - 1.0f);
+    float dy = M_PI * ty;
+    ox += dx * cosf(dy);
+    oy += dx * sinf(dy);
+    """)
+
+var(19, 'power', """
+    float a = atan2f(tx, ty);
+    float sa = sinf(a);
+    float r = w * powf(sqrtf(tx*tx + ty*ty),sa);
+    ox += r * cosf(a);
+    oy += r * sa;
+    """)
+
 var(33, 'juliascope', """
     float ang = atan2f(ty, tx);
     float power = {{px.get('xf.juliascope_power', 'juscope_power')}};