October 15, 2019 update:
  • The Daydream View VR headset is no longer available for purchase. However, developers can continue to use the existing Google VR SDK to update and distribute their apps to the Google Play Store, and make them available to users in the Daydream app.

GvrView.Renderer

public static interface GvrView.Renderer

Interface for renderers who need to handle all the stereo rendering details by themselves.

Public Methods

abstract void
onDrawFrame(HeadTransform headTransform, Eye leftEye, Eye rightEye)
Requests to draw a new frame.
abstract void
onFinishFrame(Viewport viewport)
Called before a frame is finished.
abstract void
onRendererShutdown()
Called on the renderer thread when the thread is shutting down.
abstract void
onSurfaceChanged(int width, int height)
Called when there is a change in the surface dimensions.
abstract void
onSurfaceCreated(EGLConfig config)
Called when the surface is created or recreated.

Public Methods

public abstract void onDrawFrame (HeadTransform headTransform, Eye leftEye, Eye rightEye)

Requests to draw a new frame.

The implementor is assumed to handle all stereoscopic details by itself by making use of the provided head transformation and eye parameters.

If distortion correction is enabled the GL context will be set to draw into a framebuffer backed by a texture at the time of this call. If an implementor needs to change the current framebuffer, it must be reset back afterwards to the one obtained via glGetIntegerv(GL_FRAMEBUFFER_BINDING, ...) at the beginning of this call.

If stereo mode is disabled, instead of providing the parameters of two eyes, the left eye will contain monocular rendering parameters and the right eye will be null. No distortion correction will take place in that case. For monocular rendering, the implementor should feel free to ignore the FieldOfView and instead create a perspective matrix with whatever field of view is desired for monocular rendering (ScreenParams.getWidth()/ScreenParams.getHeight() can provide the aspect ratio). See the setStereoModeEnabled method for details.

Parameters
headTransform The head transformation for this frame, independent to any eyes.
leftEye Parameters of the left eye, or a single eye if stereo mode is disabled.
rightEye Parameters of the right eye, or null if stereo mode is disabled.

public abstract void onFinishFrame (Viewport viewport)

Called before a frame is finished.

By the time of this call, the frame contents have been already drawn and, if enabled, distortion correction has been applied.

This method allows to perform additional overlay rendering over the frame results. For example, it could be used to draw markers that help users to properly center their displays in their viewers.

A viewport object describing the bounds of the full surface is provided, but not set in the GL context. Renderer implementors are responsible of setting the viewport if needed.

Parameters
viewport Viewport of the full GL surface. To be set by renderers if needed.

public abstract void onRendererShutdown ()

Called on the renderer thread when the thread is shutting down.

Allows releasing GL resources and performing shutdown operations in the renderer thread. Called only if there was a previous call to onSurfaceCreated.

public abstract void onSurfaceChanged (int width, int height)

Called when there is a change in the surface dimensions.

Viewport, field of view and projection details are automatically updated.

Note that the eye parameters passed to onDrawFrame(HeadTransform, Eye, Eye) are computed under the assumption that the surface dimensions correspond to a fullscreen landscape view. Any other configuration is likely to lead to convergence problems.

Parameters
width New width of the surface in pixels.
height New height of the surface in pixels.

public abstract void onSurfaceCreated (EGLConfig config)

Called when the surface is created or recreated.

Parameters
config The EGL configuration used when creating the surface.