ngon-fill: Fix incorrect texturing in ortho mapping mode

distributable/rngon.cat.js

@@ -1,6 +1,6 @@
 // WHAT: Concatenated JavaScript source files
 // PROGRAM: Retro n-gon renderer
-// VERSION: beta live (22 June 2020 23:09:43 UTC)
+// VERSION: beta live (22 June 2020 23:43:46 UTC)
 // AUTHOR: Tarpeeksi Hyvae Soft and others
 // LINK: https://www.github.com/leikareipa/retro-ngon/
 // FILES:
@@ -1092,7 +1092,7 @@ Rngon.ngon_filler = function(auxiliaryBuffers = [])
         else if (ngon.vertices.length === 2)
         {
             Rngon.line_draw(ngon.vertices[0], ngon.vertices[1], material.color);
-            
+
             continue;
         }
 
@@ -1431,7 +1431,7 @@ Rngon.ngon_filler = function(auxiliaryBuffers = [])
                                         v = (ngonY * (texture.height / ngonHeight));
 
                                         // The texture image is flipped, so we need to flip V as well.
-                                        v = (texture.height - v - 1);
+                                        v = (texture.height - v);
 
                                         break;
                                     }
@@ -1440,6 +1440,9 @@ Rngon.ngon_filler = function(auxiliaryBuffers = [])
 
                                 const texel = texture.pixels[(~~u) + (~~v) * texture.width];
 
+                                // Make sure we gracefully exit if accessing the texture out of bounds.
+                                if (!texel) continue;
+
                                 // Alpha-test the texture. If the texel isn't fully opaque, skip it.
                                 if (texel.alpha !== 255) continue;
 

js/retro-ngon/ngon-fill.js

@@ -123,7 +123,7 @@ Rngon.ngon_filler = function(auxiliaryBuffers = [])
         else if (ngon.vertices.length === 2)
         {
             Rngon.line_draw(ngon.vertices[0], ngon.vertices[1], material.color);
-            
+
             continue;
         }
 
@@ -462,7 +462,7 @@ Rngon.ngon_filler = function(auxiliaryBuffers = [])
                                         v = (ngonY * (texture.height / ngonHeight));
 
                                         // The texture image is flipped, so we need to flip V as well.
-                                        v = (texture.height - v - 1);
+                                        v = (texture.height - v);
 
                                         break;
                                     }
@@ -471,6 +471,9 @@ Rngon.ngon_filler = function(auxiliaryBuffers = [])
 
                                 const texel = texture.pixels[(~~u) + (~~v) * texture.width];
 
+                                // Make sure we gracefully exit if accessing the texture out of bounds.
+                                if (!texel) continue;
+
                                 // Alpha-test the texture. If the texel isn't fully opaque, skip it.
                                 if (texel.alpha !== 255) continue;