GL: Delete frame buffers after use.

Before, we used to never call glDeleteFramebuffers, which could
in theory lead to leaks in the number of frame buffers
available and make releasing the GL context more expensive.

PiperOrigin-RevId: 514387847

library/common/src/main/java/com/google/android/exoplayer2/util/GlUtil.java

@@ -644,6 +644,14 @@ public final class GlUtil {
     return fboId[0];
   }
 
+  /** Deletes a framebuffer. */
+  public static void deleteFbo(int fboId) throws GlException {
+    int[] fboIdArray = new int[1];
+    fboIdArray[0] = fboId;
+    GLES20.glDeleteFramebuffers(/* n= */ 1, fboIdArray, /* offset= */ 0);
+    checkGlError();
+  }
+
   /**
    * Throws a {@link GlException} with the given message if {@code expression} evaluates to {@code
    * false}.

library/effect/src/main/java/com/google/android/exoplayer2/effect/FrameCacheGlShaderProgram.java

@@ -205,6 +205,7 @@ import java.util.concurrent.Executor;
     while (allTextures.hasNext()) {
       TextureInfo textureInfo = allTextures.next();
       GlUtil.deleteTexture(textureInfo.texId);
+      GlUtil.deleteFbo(textureInfo.fboId);
     }
     freeOutputTextures.clear();
     inUseOutputTextures.clear();

library/effect/src/main/java/com/google/android/exoplayer2/effect/SingleFrameGlShaderProgram.java

@@ -154,6 +154,7 @@ public abstract class SingleFrameGlShaderProgram implements GlShaderProgram {
         || outputSize.getHeight() != outputTexture.height) {
       if (outputTexture != null) {
         GlUtil.deleteTexture(outputTexture.texId);
+        GlUtil.deleteFbo(outputTexture.fboId);
       }
       int outputTexId = GlUtil.createTexture(outputSize.getWidth(), outputSize.getHeight(), useHdr);
       int outputFboId = GlUtil.createFboForTexture(outputTexId);
@@ -187,6 +188,7 @@ public abstract class SingleFrameGlShaderProgram implements GlShaderProgram {
     if (outputTexture != null) {
       try {
         GlUtil.deleteTexture(outputTexture.texId);
+        GlUtil.deleteFbo(outputTexture.fboId);
       } catch (GlUtil.GlException e) {
         throw new VideoFrameProcessingException(e);
       }