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glClear in FrameProcessorChain so the GlFrameProcessors don't have to.

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Since the output textures and surfaces are managed by the
FrameProcessorChain, clearing them there makes sense.
This is also less error-prone as it might not be obvious to
someone implementing a GlFrameProcessor that they need to
glClear. (Clearing twice won't cause any problems.)

PiperOrigin-RevId: 438532247
This commit is contained in:
hschlueter 2022-03-31 12:13:42 +01:00 committed by Ian Baker
parent 22ca225fa3
commit aadbf3d59b
3 changed files with 11 additions and 8 deletions
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3
libraries/transformer/src/main/java/androidx/media3/transformer/AdvancedFrameProcessor.java
View File

@ -128,9 +128,6 @@ public final class AdvancedFrameProcessor implements GlFrameProcessor {
checkStateNotNull(glProgram);
glProgram.use();
glProgram.bindAttributesAndUniforms();
GLES20.glClearColor(/* red= */ 0, /* green= */ 0, /* blue= */ 0, /* alpha= */ 0);
GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT);
GlUtil.checkGlError();
// The four-vertex triangle strip forms a quad.
GLES20.glDrawArrays(GLES20.GL_TRIANGLE_STRIP, /* first= */ 0, /* count= */ 4);
GlUtil.checkGlError();

2
libraries/transformer/src/main/java/androidx/media3/transformer/ExternalCopyFrameProcessor.java
View File

@ -105,8 +105,6 @@ import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
checkStateNotNull(glProgram);
glProgram.use();
glProgram.bindAttributesAndUniforms();
GLES20.glClearColor(/* red= */ 0, /* green= */ 0, /* blue= */ 0, /* alpha= */ 0);
GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT);
// The four-vertex triangle strip forms a quad.
GLES20.glDrawArrays(GLES20.GL_TRIANGLE_STRIP, /* first= */ 0, /* count= */ 4);
}

14
libraries/transformer/src/main/java/androidx/media3/transformer/FrameProcessorChain.java
View File

@ -92,7 +92,7 @@ import org.checkerframework.checker.nullness.qual.RequiresNonNull;
private final float[] textureTransformMatrix;
private final ExternalCopyFrameProcessor externalCopyFrameProcessor;
private final List<GlFrameProcessor> frameProcessors;
private final ImmutableList<GlFrameProcessor> frameProcessors;
/**
* Identifiers of a framebuffer object associated with the intermediate textures that receive
* output from the previous {@link GlFrameProcessor}, and provide input for the following {@link
@ -413,6 +413,7 @@ import org.checkerframework.checker.nullness.qual.RequiresNonNull;
externalCopyFrameProcessor.setTextureTransformMatrix(textureTransformMatrix);
long presentationTimeNs = inputSurfaceTexture.getTimestamp();
long presentationTimeUs = presentationTimeNs / 1000;
clearOutputFrame();
externalCopyFrameProcessor.updateProgramAndDraw(presentationTimeUs);
for (int i = 0; i < frameProcessors.size() - 1; i++) {
@ -424,10 +425,12 @@ import org.checkerframework.checker.nullness.qual.RequiresNonNull;
framebuffers[i + 1],
outputSize.getWidth(),
outputSize.getHeight());
clearOutputFrame();
frameProcessors.get(i).updateProgramAndDraw(presentationTimeUs);
}
if (!frameProcessors.isEmpty()) {
GlUtil.focusEglSurface(eglDisplay, eglContext, eglSurface, outputWidth, outputHeight);
clearOutputFrame();
getLast(frameProcessors).updateProgramAndDraw(presentationTimeUs);
}
@ -437,8 +440,7 @@ import org.checkerframework.checker.nullness.qual.RequiresNonNull;
if (debugPreviewEglSurface != null) {
GlUtil.focusEglSurface(
eglDisplay, eglContext, debugPreviewEglSurface, debugPreviewWidth, debugPreviewHeight);
GLES20.glClearColor(/* red= */ 0, /* green= */ 0, /* blue= */ 0, /* alpha= */ 0);
GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT);
clearOutputFrame();
// The four-vertex triangle strip forms a quad.
GLES20.glDrawArrays(GLES20.GL_TRIANGLE_STRIP, /* first= */ 0, /* count= */ 4);
EGL14.eglSwapBuffers(eglDisplay, debugPreviewEglSurface);
@ -447,6 +449,12 @@ import org.checkerframework.checker.nullness.qual.RequiresNonNull;
checkState(pendingFrameCount.getAndDecrement() > 0);
}
private static void clearOutputFrame() {
GLES20.glClearColor(/* red= */ 0, /* green= */ 0, /* blue= */ 0, /* alpha= */ 0);
GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT);
GlUtil.checkGlError();
}
/**
* Configures the input and output {@linkplain Size sizes} of a list of {@link GlFrameProcessor
* GlFrameProcessors}.