Fixing issue where the first frame would always be white because glUn…

…iform1i was failing after this switched shader programs unexpectedly due to the need to initialize the second filter.
mtfrctl · Sep 5, 2013 · e98cc81 · e98cc81
1 parent b7cac76
commit e98cc81
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/framework/Source/GPUImageSobelEdgeDetectionFilter.m b/framework/Source/GPUImageSobelEdgeDetectionFilter.m
@@ -125,9 +125,11 @@ - (void)setupFilterForSize:(CGSize)filterFrameSize;
         _texelHeight = 1.0 / filterFrameSize.height;
 
         runSynchronouslyOnVideoProcessingQueue(^{
+            GLProgram *previousProgram = [GPUImageContext sharedImageProcessingContext].currentShaderProgram;
             [GPUImageContext setActiveShaderProgram:secondFilterProgram];
             glUniform1f(texelWidthUniform, _texelWidth);
             glUniform1f(texelHeightUniform, _texelHeight);
+            [GPUImageContext setActiveShaderProgram:previousProgram];
         });
     }
 }