Renderer.GlesRenderer2

@WorkerThread
public <SharedAssetsT extends Renderer.SharedAssets> GlesRenderer2(
    @NonNull SurfaceHolder surfaceHolder,
    @NonNull CurrentUserStyleRepository currentUserStyleRepository,
    @NonNull WatchState watchState,
    @IntRange(from = 0, to = 60000) long interactiveDrawModeUpdateDelayMillis,
    @NonNull int[] eglConfigAttribList,
    @NonNull int[] eglSurfaceAttribList,
    @NonNull int[] eglContextAttribList
)

Constructs a GlesRenderer2.

public final int getSelectedEglConfigAttribListIndex()

If an eglConfigAttribListList is specified then each list of attributes will be tried in turn by EGL14.eglChooseConfig. The first one to succeed is chosen and its index is written to selectedEglConfigAttribListIndex.

If an eglConfigAttribListList was not specified this will be zero. If this is accessed before the constructor has finished an exception will be thrown.

public final void render(@NonNull ZonedDateTime zonedDateTime)

Sub-classes should override this to implement their watch face rendering logic which should respect the current renderParameters. Please note WatchState.isAmbient may not match the RenderParameters.drawMode and should not be used to decide what to render. E.g. when editing from the companion phone while the watch is ambient, renders may be requested with DrawMode.INTERACTIVE.

Any highlights due to RenderParameters.highlightLayer should be rendered by renderHighlightLayer instead where possible. For correct behavior this function must use the supplied ZonedDateTime in favor of any other ways of getting the time.

Note this function is called inside a lambda passed to runUiThreadGlCommands which has synchronized access to the GL context.

Note also GLES20.glBlendFunc(GLES20.GL_ONE, GLES20.GL_ZERO) is called by the library before this method.

Before any calls to this function onBackgroundThreadGlContextCreated and onUiThreadGlSurfaceCreated will have been called once on their respective threads.

@UiThread
public abstract void render(
    @NonNull ZonedDateTime zonedDateTime,
    @NonNull SharedAssetsT sharedAssets
)

Sub-classes should override this to implement their watch face rendering logic which should respect the current renderParameters. Please note WatchState.isAmbient may not match the RenderParameters.drawMode and should not be used to decide what to render. E.g. when editing from the companion phone while the watch is ambient, renders may be requested with DrawMode.INTERACTIVE.

Any highlights due to RenderParameters.highlightLayer should be rendered by renderHighlightLayer instead where possible. For correct behavior this function must use the supplied ZonedDateTime in favor of any other ways of getting the time.

Note this function is called inside a lambda passed to runUiThreadGlCommands which has synchronized access to the GL context.

Note also GLES20.glBlendFunc(GLES20.GL_ONE, GLES20.GL_ZERO) is called by the library before this method.

Before any calls to this function onBackgroundThreadGlContextCreated and onUiThreadGlSurfaceCreated will have been called once on their respective threads. In addition if SharedAssets hasn't already been created, then a call to createSharedAssets will have been completed before calling render.

public final void renderHighlightLayer(@NonNull ZonedDateTime zonedDateTime)

Sub-classes should override this to implement their watch face highlight layer rendering logic for the RenderParameters.highlightLayer aspect of renderParameters. Typically the implementation will clear the buffer to RenderParameters.HighlightLayer.backgroundTint before rendering a transparent highlight or a solid outline around the RenderParameters.HighlightLayer.highlightedElement. This will be composited as needed on top of the results of render. For correct behavior this function must use the supplied ZonedDateTime in favor of any other ways of getting the time.

Note this function is called inside a lambda passed to runUiThreadGlCommands which has synchronized access to the GL context.

Note also GLES20.glBlendFunc(GLES20.GL_ONE, GLES20.GL_ZERO) is called by the library before this method.

@UiThread
public abstract void renderHighlightLayer(
    @NonNull ZonedDateTime zonedDateTime,
    @NonNull SharedAssetsT sharedAssets
)

Sub-classes should override this to implement their watch face highlight layer rendering logic for the RenderParameters.highlightLayer aspect of renderParameters. Typically the implementation will clear the buffer to RenderParameters.HighlightLayer.backgroundTint before rendering a transparent highlight or a solid outline around the RenderParameters.HighlightLayer.highlightedElement. This will be composited as needed on top of the results of render. For correct behavior this function must use the supplied ZonedDateTime in favor of any other ways of getting the time.

Note this function is called inside a lambda passed to runUiThreadGlCommands which has synchronized access to the GL context.

Note also GLES20.glBlendFunc(GLES20.GL_ONE, GLES20.GL_ZERO) is called by the library before this method.

@WorkerThread
protected abstract @NonNull SharedAssetsT createSharedAssets()

When editing multiple WatchFaceService instances and hence Renderers can exist concurrently (e.g. a headless instance and an interactive instance) and using SharedAssets allows memory to be saved by sharing immutable data (e.g. Bitmaps, shaders, etc...) between them.

To take advantage of SharedAssets, override this method. The constructed SharedAssets are passed into the render as an argument (NB you'll have to cast this to your type). It is safe to make GLES calls within this method.

When all instances using SharedAssets have been closed, SharedAssets.onDestroy will be called.

Note that while SharedAssets are constructed on a background thread, they'll typically be used on the main thread and subsequently destroyed there. The watch face library constructs shared GLES contexts to allow resource sharing between threads.