From 85f48c1d799278a528011a908f6241940bf644bf Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Miloslav=20=C4=8C=C3=AD=C5=BE?= <tastyfish@seznam.cz>
Date: Sun, 18 Nov 2018 09:33:15 +0100
Subject: [PATCH] Advance barycentric

---
 s3l.h     | 7 +++++--
 testSDL.c | 9 +++++----
 2 files changed, 10 insertions(+), 6 deletions(-)

diff --git a/s3l.h b/s3l.h
index c24670c..759958a 100644
--- a/s3l.h
+++ b/s3l.h
@@ -273,7 +273,6 @@ void S3L_drawTriangle(int16_t x0, int16_t y0, int16_t x1, int16_t y1, int16_t x2
         initSide(l,l,r,0);
 
         barycentric1 = &p.barycentricC;
-        barycentric2 = &p.barycentricB;
         barycentric3 = &p.barycentricA;
 
         rSideUnitPos = S3L_FRACTIONS_PER_UNIT - rSideUnitPos;
@@ -283,7 +282,11 @@ void S3L_drawTriangle(int16_t x0, int16_t y0, int16_t x1, int16_t y1, int16_t x2
       {
         initSide(r,r,l,0);
 
-        // TODO
+        barycentric2 = &p.barycentricC;
+        barycentric3 = &p.barycentricB;
+
+        lSideUnitPos = S3L_FRACTIONS_PER_UNIT - lSideUnitPos;
+        lSideUnitStep *= -1;
       }
     }
 
diff --git a/testSDL.c b/testSDL.c
index 17877b3..c4ccdbd 100644
--- a/testSDL.c
+++ b/testSDL.c
@@ -48,16 +48,17 @@ const int16_t test_coords[] =
     100,100, 99,101,    101,101,  // 0, small triangle
     190,50,  200,10,    400,80,   // 1, arbitrary
     40,80,   20,50,     100,30,   // 2, arbitrary
-    150,300, 290,400,   450,400,  // 3, regular
-    105,300, 120,300,   201,300,  // 4, horizontal line
-    400,300, 400,320,   400,400   // 5, vertical line
+    350,270, 440,200,   490,220,  // 3, arbitrary
+    150,300, 290,400,   450,400,  // 4, regular
+    105,200, 120,200,   201,200,  // 5, horizontal line
+    300,200, 300,250,   300,220   // 6, vertical line
   };
 
 void draw()
 {
   clearScreen();
 
-  for (int c = 0; c < 4; ++c)
+  for (int c = 0; c < 7; ++c)
   {
     int
       x0 = test_coords[6 * c],