diff --git a/s3l.h b/s3l.h
index d1ba1ac..6ee95b5 100644
--- a/s3l.h
+++ b/s3l.h
@@ -193,7 +193,7 @@ void S3L_drawTriangle(int16_t x0, int16_t y0, int16_t x1, int16_t y1, int16_t x2
     v##Dx = p2##PointX - p1##PointX;\
     v##Dy = p2##PointY - p1##PointY;\
     v##Inc = v##Dx >= 0 ? 1 : -1;\
-    v##Err = 2 * v##Dx - v##Dy;\
+    v##Err = 2 * v##Dx - v##Dy; \
     v##ErrAdd = 2 * S3L_abs(v##Dx);\
     v##ErrSub = 2 * S3L_abs(v##Dy);
 
@@ -214,6 +214,8 @@ void S3L_drawTriangle(int16_t x0, int16_t y0, int16_t x1, int16_t y1, int16_t x2
   {
     p.y = currentY;
 
+    // draw the line
+
     for (S3L_COORD x = lX; x <= rX; ++x)
     {
       p.x = x;
diff --git a/testSDL.c b/testSDL.c
index 1306d2c..eaddf2a 100644
--- a/testSDL.c
+++ b/testSDL.c
@@ -21,30 +21,50 @@ void clearScreen()
 static inline void setPixel(int x, int y, uint8_t red, uint8_t green, uint8_t blue)
 {
   uint32_t r = red & 0x000000FF;
-  r = r << 16;
+  r = r << 24;
 
   uint32_t g = green & 0x000000FF;
-  g = g << 8;
+  g = g << 16;
 
   uint32_t b = blue & 0x000000FF;
+  b = b << 8;
 
   pixels[y * SCREEN_WIDTH + x] = r | g | b;
 }
 
 void drawPixel(S3L_PixelInfo *p)
 {
-  setPixel(p->x,p->y,255,255,0);
+  setPixel(p->x,p->y,255,255,255);
 }
 
+const int16_t test_coords[] =
+  {
+    100,100, 99,101,    101,101,  // 0, small triangle
+    90,50,   100,10,    300,80,   // 1, arbitrary
+    100,30,  20,50,     40,80     // 2, arbitrary
+  };
+
 void draw()
 {
   clearScreen();
 
-  setPixel(90,50,255,0,0);
-  setPixel(100,10,255,0,0);
-  setPixel(300,80,255,0,0);
+int c = 0;
 
-  S3L_drawTriangle(90,50,100,10,300,80);
+  int
+    x0 = test_coords[6 * c],
+    y0 = test_coords[6 * c + 1],
+    x1 = test_coords[6 * c + 2],
+    y1 = test_coords[6 * c + 3],
+    x2 = test_coords[6 * c + 4],
+    y2 = test_coords[6 * c + 5];
+
+  S3L_drawTriangle(x0,y0,x1,y1,x2,y2);
+
+/*
+  setPixel(x0,y0,255,0,0);
+  setPixel(x1,y1,255,0,0);
+  setPixel(x2,y2,255,0,0);
+*/
 }
 
 int main()