WVR Overlay

Overlay provides a way to draw 2D images over 3D scenes. These methods allow the developers to controll the overlays’ appearance, behaviors and events.

Tutorial

• Include libwvr_api.so and the overlay header file “wvr/wvr_overlay.h”.
• After executing WVR_RenderInit(), get the overlay ID through WVR_GenOverlay().

After WVR_RenderInit()
WVR_GenOverlay(&overlayId);
overlayEventCallback.overlayId = overlayId;

• Assign the event handle method, and register the overlay event callback.

overlayEventCallback.callback = handleInputEvent;
WVR_RegisterOverlayInputEvent(&overlayEventCallback);

void handleInputEvent(int32_t id, HVR_EventType type, HVR_InputId inputId) {
    ....  // Perform action
}

• Generate the texture, and assign the texture ID to the overlay.

WVR_SetOverlayTextureId(overlayId, &texture);

• Set the overlay position.

const WVR_OverlayPosition position = {0.0f, 0.0f, -1.0f};
WVR_SetOverlayFixedPosition(overlayId, &position);