fix a bug in bulge distortion fragment shader which causes the distor…

…tion area to be misplaced when the distortion center y is not 0.5
BradLarson · Feb 5, 2015 · 4879be2 · 4879be2
1 parent 011f4af
commit 4879be2
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/framework/Source/GPUImageBulgeDistortionFilter.m b/framework/Source/GPUImageBulgeDistortionFilter.m
@@ -14,7 +14,7 @@
 
  void main()
  {
-    highp vec2 textureCoordinateToUse = vec2(textureCoordinate.x, (textureCoordinate.y * aspectRatio + 0.5 - 0.5 * aspectRatio));
+    highp vec2 textureCoordinateToUse = vec2(textureCoordinate.x, ((textureCoordinate.y - center.y) * aspectRatio) + center.y);
     highp float dist = distance(center, textureCoordinateToUse);
     textureCoordinateToUse = textureCoordinate;
 
@@ -45,7 +45,7 @@ void main()
 
  void main()
  {
-    vec2 textureCoordinateToUse = vec2(textureCoordinate.x, (textureCoordinate.y * aspectRatio + 0.5 - 0.5 * aspectRatio));
+    vec2 textureCoordinateToUse = vec2(textureCoordinate.x, ((textureCoordinate.y - center.y) * aspectRatio) + center.y);
     float dist = distance(center, textureCoordinateToUse);
     textureCoordinateToUse = textureCoordinate;