Saturation filter working with alpha

tapsquare · Mar 9, 2012 · 34f301d · 34f301d
1 parent 29772f1
commit 34f301d
Showing 1 changed file with 4 additions and 3 deletions.
diff --git a/framework/Source/GPUImageSaturationFilter.m b/framework/Source/GPUImageSaturationFilter.m
@@ -12,11 +12,12 @@
 
  void main()
  {
-    lowp vec3 textureColor = texture2D(inputImageTexture, textureCoordinate).rgb;
-    lowp float luminance = dot(textureColor, luminanceWeighting);
+    lowp vec4 textureColor = texture2D(inputImageTexture, textureCoordinate);
+    lowp float luminance = dot(textureColor.rgb, luminanceWeighting);
     lowp vec3 greyScaleColor = vec3(luminance);
 
-    gl_FragColor = vec4(mix(greyScaleColor, textureColor, saturation), 1.0);
+	gl_FragColor = vec4(mix(greyScaleColor, textureColor.rgb, saturation), textureColor.w);
+
  }
 );