From e3274d7fc1cf8af74b245dfc8d559c187f6d144d Mon Sep 17 00:00:00 2001
From: erwincoumans <erwin.coumans@gmail.com>
Date: Tue, 27 Oct 2020 13:38:01 -0700
Subject: [PATCH] Update model.cpp

fix uv wrapping, thanks to Marek
---
 examples/TinyRenderer/model.cpp | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/examples/TinyRenderer/model.cpp b/examples/TinyRenderer/model.cpp
index 6bbaa5167..1f5bebc1b 100644
--- a/examples/TinyRenderer/model.cpp
+++ b/examples/TinyRenderer/model.cpp
@@ -166,14 +166,23 @@ TGAColor Model::diffuse(Vec2f uvf)
 		//		bool repeat = true;
 		//		if (repeat)
 		{
-            uvf[0] = std::modf(uvf[0], &val);
-            uvf[1] = std::modf(uvf[1], &val);
-        }
-        Vec2i uv(uvf[0] * diffusemap_.get_width(), uvf[1] * diffusemap_.get_height());
+			uvf[0] = std::modf(uvf[0], &val);
+			if (uvf[0] < 0) 
+			{
+				uvf[0] = uvf[0] + 1;
+			}
+			uvf[1] = std::modf(uvf[1], &val);
+			if (uvf[1] < 0) 
+			{
+				uvf[1] = uvf[1] + 1;
+			}
+		}
+        	Vec2i uv(uvf[0] * diffusemap_.get_width(), uvf[1] * diffusemap_.get_height());
 		return diffusemap_.get(uv[0], uv[1]);
 	}
 	return TGAColor(255, 255, 255, 255);
 }
+	
 
 Vec3f Model::normal(Vec2f uvf)
 {