Add Texture.use

cameraview/src/main/java/com/otaliastudios/cameraview/filter/MultiFilter.java

@@ -63,7 +63,6 @@ public class MultiFilter implements Filter, OneParameterFilter, TwoParameterFilt
      * Creates a new group with the given filters.
      * @param filters children
      */
-    @SuppressWarnings("WeakerAccess")
     public MultiFilter(@NonNull Filter... filters) {
         this(Arrays.asList(filters));
     }

cameraview/src/main/java/com/otaliastudios/cameraview/internal/GlTextureDrawer.java

@@ -63,11 +63,12 @@ public class GlTextureDrawer {
         mTextureTransform = textureTransform;
     }
 
-    public void draw(long timestampUs) {
+    public void draw(final long timestampUs) {
         if (mPendingFilter != null) {
             release();
             mFilter = mPendingFilter;
             mPendingFilter = null;
+
         }
 
         if (mProgramHandle == -1) {
@@ -75,20 +76,16 @@ public class GlTextureDrawer {
                     mFilter.getVertexShader(),
                     mFilter.getFragmentShader());
             mFilter.onCreate(mProgramHandle);
+            Egloo.checkGlError("program creation");
         }
 
-        Egloo.checkGlError("draw start");
-        // Select the program and the active texture.
         GLES20.glUseProgram(mProgramHandle);
-        Egloo.checkGlError("glUseProgram");
-        GLES20.glActiveTexture(mTexture.getUnit());
-        GLES20.glBindTexture(mTexture.getTarget(), mTexture.getId());
-
-        // Draw and release.
+        Egloo.checkGlError("glUseProgram(handle)");
+        mTexture.bind();
         mFilter.draw(timestampUs, mTextureTransform);
-        GLES20.glBindTexture(mTexture.getTarget(), 0);
+        mTexture.unbind();
         GLES20.glUseProgram(0);
-        Egloo.checkGlError("draw end");
+        Egloo.checkGlError("glUseProgram(0)");
     }
 
     public void release() {

demo/src/main/java/com/otaliastudios/cameraview/demo/CameraActivity.java

@@ -372,13 +372,13 @@ public class CameraActivity extends AppCompatActivity implements View.OnClickLis
         message(filter.toString(), false);
 
         // Normal behavior:
-        camera.setFilter(filter.newInstance());
+        // camera.setFilter(filter.newInstance());
 
         // To test MultiFilter:
-        // DuotoneFilter duotone = new DuotoneFilter();
-        // duotone.setFirstColor(Color.RED);
-        // duotone.setSecondColor(Color.GREEN);
-        // camera.setFilter(new MultiFilter(duotone, filter.newInstance()));
+        DuotoneFilter duotone = new DuotoneFilter();
+        duotone.setFirstColor(Color.RED);
+        duotone.setSecondColor(Color.GREEN);
+        camera.setFilter(new MultiFilter(duotone, filter.newInstance()));
     }
 
     @Override