Rename GlFrameProcessor updateProgramAndDraw to drawFrame.

What a minimal implementation should include is now explained in the
interface javadoc while the method name reflects what the method does.

PiperOrigin-RevId: 441432059

demos/transformer/src/main/java/com/google/android/exoplayer2/transformerdemo/BitmapOverlayFrameProcessor.java

@@ -117,7 +117,7 @@ import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
   }
 
   @Override
-  public void updateProgramAndDraw(long presentationTimeUs) {
+  public void drawFrame(long presentationTimeUs) {
     checkStateNotNull(glProgram);
     glProgram.use();
 

demos/transformer/src/main/java/com/google/android/exoplayer2/transformerdemo/PeriodicVignetteFrameProcessor.java

@@ -105,7 +105,7 @@ import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
   }
 
   @Override
-  public void updateProgramAndDraw(long presentationTimeUs) {
+  public void drawFrame(long presentationTimeUs) {
     checkStateNotNull(glProgram).use();
     double theta = presentationTimeUs * 2 * Math.PI / DIMMING_PERIOD_US;
     float innerRadius = minInnerRadius + deltaInnerRadius * (0.5f - 0.5f * (float) Math.cos(theta));

library/transformer/src/androidTest/java/com/google/android/exoplayer2/transformer/AdvancedFrameProcessorPixelTest.java

@@ -86,14 +86,14 @@ public final class AdvancedFrameProcessorPixelTest {
   }
 
   @Test
-  public void updateProgramAndDraw_noEdits_producesExpectedOutput() throws Exception {
-    String testId = "updateProgramAndDraw_noEdits";
+  public void drawFrame_noEdits_producesExpectedOutput() throws Exception {
+    String testId = "drawFrame_noEdits";
     Matrix identityMatrix = new Matrix();
     advancedFrameProcessor = new AdvancedFrameProcessor(getApplicationContext(), identityMatrix);
     advancedFrameProcessor.initialize(inputTexId, width, height);
     Bitmap expectedBitmap = BitmapTestUtil.readBitmap(FIRST_FRAME_PNG_ASSET_STRING);
 
-    advancedFrameProcessor.updateProgramAndDraw(/* presentationTimeUs= */ 0);
+    advancedFrameProcessor.drawFrame(/* presentationTimeUs= */ 0);
     Bitmap actualBitmap =
         BitmapTestUtil.createArgb8888BitmapFromCurrentGlFramebuffer(width, height);
 
@@ -107,8 +107,8 @@ public final class AdvancedFrameProcessorPixelTest {
   }
 
   @Test
-  public void updateProgramAndDraw_translateRight_producesExpectedOutput() throws Exception {
-    String testId = "updateProgramAndDraw_translateRight";
+  public void drawFrame_translateRight_producesExpectedOutput() throws Exception {
+    String testId = "drawFrame_translateRight";
     Matrix translateRightMatrix = new Matrix();
     translateRightMatrix.postTranslate(/* dx= */ 1, /* dy= */ 0);
     advancedFrameProcessor =
@@ -117,7 +117,7 @@ public final class AdvancedFrameProcessorPixelTest {
     Bitmap expectedBitmap =
         BitmapTestUtil.readBitmap(TRANSLATE_RIGHT_EXPECTED_OUTPUT_PNG_ASSET_STRING);
 
-    advancedFrameProcessor.updateProgramAndDraw(/* presentationTimeUs= */ 0);
+    advancedFrameProcessor.drawFrame(/* presentationTimeUs= */ 0);
     Bitmap actualBitmap =
         BitmapTestUtil.createArgb8888BitmapFromCurrentGlFramebuffer(width, height);
 
@@ -131,8 +131,8 @@ public final class AdvancedFrameProcessorPixelTest {
   }
 
   @Test
-  public void updateProgramAndDraw_scaleNarrow_producesExpectedOutput() throws Exception {
-    String testId = "updateProgramAndDraw_scaleNarrow";
+  public void drawFrame_scaleNarrow_producesExpectedOutput() throws Exception {
+    String testId = "drawFrame_scaleNarrow";
     Matrix scaleNarrowMatrix = new Matrix();
     scaleNarrowMatrix.postScale(.5f, 1.2f);
     advancedFrameProcessor = new AdvancedFrameProcessor(getApplicationContext(), scaleNarrowMatrix);
@@ -140,7 +140,7 @@ public final class AdvancedFrameProcessorPixelTest {
     Bitmap expectedBitmap =
         BitmapTestUtil.readBitmap(SCALE_NARROW_EXPECTED_OUTPUT_PNG_ASSET_STRING);
 
-    advancedFrameProcessor.updateProgramAndDraw(/* presentationTimeUs= */ 0);
+    advancedFrameProcessor.drawFrame(/* presentationTimeUs= */ 0);
     Bitmap actualBitmap =
         BitmapTestUtil.createArgb8888BitmapFromCurrentGlFramebuffer(width, height);
 
@@ -154,15 +154,15 @@ public final class AdvancedFrameProcessorPixelTest {
   }
 
   @Test
-  public void updateProgramAndDraw_rotate90_producesExpectedOutput() throws Exception {
-    String testId = "updateProgramAndDraw_rotate90";
+  public void drawFrame_rotate90_producesExpectedOutput() throws Exception {
+    String testId = "drawFrame_rotate90";
     Matrix rotate90Matrix = new Matrix();
     rotate90Matrix.postRotate(/* degrees= */ 90);
     advancedFrameProcessor = new AdvancedFrameProcessor(getApplicationContext(), rotate90Matrix);
     advancedFrameProcessor.initialize(inputTexId, width, height);
     Bitmap expectedBitmap = BitmapTestUtil.readBitmap(ROTATE_90_EXPECTED_OUTPUT_PNG_ASSET_STRING);
 
-    advancedFrameProcessor.updateProgramAndDraw(/* presentationTimeUs= */ 0);
+    advancedFrameProcessor.drawFrame(/* presentationTimeUs= */ 0);
     Bitmap actualBitmap =
         BitmapTestUtil.createArgb8888BitmapFromCurrentGlFramebuffer(width, height);
 

library/transformer/src/androidTest/java/com/google/android/exoplayer2/transformer/FrameProcessorChainTest.java

@@ -146,7 +146,7 @@ public final class FrameProcessorChainTest {
     }
 
     @Override
-    public void updateProgramAndDraw(long presentationTimeNs) {}
+    public void drawFrame(long presentationTimeNs) {}
 
     @Override
     public void release() {}

library/transformer/src/main/java/com/google/android/exoplayer2/transformer/AdvancedFrameProcessor.java

@@ -185,7 +185,7 @@ public final class AdvancedFrameProcessor implements GlFrameProcessor {
   }
 
   @Override
-  public void updateProgramAndDraw(long presentationTimeUs) {
+  public void drawFrame(long presentationTimeUs) {
     checkStateNotNull(glProgram).use();
     glProgram.setFloatsUniform(
         "uTransformationMatrix", matrixProvider.getGlMatrixArray(presentationTimeUs));

library/transformer/src/main/java/com/google/android/exoplayer2/transformer/ExternalCopyFrameProcessor.java

@@ -103,7 +103,7 @@ import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
   }
 
   @Override
-  public void updateProgramAndDraw(long presentationTimeUs) {
+  public void drawFrame(long presentationTimeUs) {
     checkStateNotNull(glProgram);
     glProgram.use();
     glProgram.bindAttributesAndUniforms();

library/transformer/src/main/java/com/google/android/exoplayer2/transformer/FrameProcessorChain.java

@@ -446,12 +446,12 @@ import org.checkerframework.checker.nullness.qual.RequiresNonNull;
           intermediateSize.getWidth(),
           intermediateSize.getHeight());
       clearOutputFrame();
-      frameProcessors.get(i).updateProgramAndDraw(presentationTimeUs);
+      frameProcessors.get(i).drawFrame(presentationTimeUs);
     }
     GlUtil.focusEglSurface(
         eglDisplay, eglContext, eglSurface, outputSize.getWidth(), outputSize.getHeight());
     clearOutputFrame();
-    getLast(frameProcessors).updateProgramAndDraw(presentationTimeUs);
+    getLast(frameProcessors).drawFrame(presentationTimeUs);
 
     EGLExt.eglPresentationTimeANDROID(eglDisplay, eglSurface, presentationTimeNs);
     EGL14.eglSwapBuffers(eglDisplay, eglSurface);

library/transformer/src/main/java/com/google/android/exoplayer2/transformer/GlFrameProcessor.java

@@ -26,7 +26,7 @@ import java.io.IOException;
  * <ol>
  *   <li>The constructor, for implementation-specific arguments.
  *   <li>{@link #initialize(int,int,int)}, to set up graphics initialization.
- *   <li>{@link #updateProgramAndDraw(long)}, to process one frame.
+ *   <li>{@link #drawFrame(long)}, to process one frame.
  *   <li>{@link #release()}, upon conclusion of processing.
  * </ol>
  */
@@ -45,8 +45,7 @@ public interface GlFrameProcessor {
   void initialize(int inputTexId, int inputWidth, int inputHeight) throws IOException;
 
   /**
-   * Returns the output {@link Size} of frames processed through {@link
-   * #updateProgramAndDraw(long)}.
+   * Returns the output {@link Size} of frames processed through {@link #drawFrame(long)}.
    *
    * <p>This method may only be called after the frame processor has been {@link
    * #initialize(int,int,int) initialized}.
@@ -54,15 +53,18 @@ public interface GlFrameProcessor {
   Size getOutputSize();
 
   /**
-   * Updates the shader program's vertex attributes and uniforms, binds them, and draws.
+   * Draws one frame.
    *
    * <p>This method may only be called after the frame processor has been {@link
    * #initialize(int,int,int) initialized}. The caller is responsible for focussing the correct
    * render target before calling this method.
    *
+   * <p>A minimal implementation should tell OpenGL to use its shader program, bind the shader
+   * program's vertex attributes and uniforms, and issue a drawing command.
+   *
    * @param presentationTimeUs The presentation timestamp of the current frame, in microseconds.
    */
-  void updateProgramAndDraw(long presentationTimeUs);
+  void drawFrame(long presentationTimeUs);
 
   /** Releases all resources. */
   void release();

library/transformer/src/main/java/com/google/android/exoplayer2/transformer/PresentationFrameProcessor.java

@@ -266,8 +266,8 @@ public final class PresentationFrameProcessor implements GlFrameProcessor {
   }
 
   @Override
-  public void updateProgramAndDraw(long presentationTimeUs) {
-    checkStateNotNull(advancedFrameProcessor).updateProgramAndDraw(presentationTimeUs);
+  public void drawFrame(long presentationTimeUs) {
+    checkStateNotNull(advancedFrameProcessor).drawFrame(presentationTimeUs);
   }
 
   @Override

library/transformer/src/main/java/com/google/android/exoplayer2/transformer/ScaleToFitFrameProcessor.java

@@ -132,8 +132,8 @@ public final class ScaleToFitFrameProcessor implements GlFrameProcessor {
   }
 
   @Override
-  public void updateProgramAndDraw(long presentationTimeUs) {
-    checkStateNotNull(advancedFrameProcessor).updateProgramAndDraw(presentationTimeUs);
+  public void drawFrame(long presentationTimeUs) {
+    checkStateNotNull(advancedFrameProcessor).drawFrame(presentationTimeUs);
   }
 
   @Override