* add support for AHardwareBuffer to the java bindings
Texture.setEXternalIamge() now can take a AHArdwreBuffer Java object
as a parameter.
* add an API to set the priority of the Skybox
by default the skybox is always drawn last (priority 7) in order to
reduce overdraw. however, when depth culling is not enabled, it
needs to be drawn first. The new Builder::priority() allows to set
an arbitrary priority for the skybox.
* add rendertarget support for external textures
This was in fact mostly already supported, we just were artificially
preventing that usage. It is supported by the EGL_external_image
extension.
It's the responsibility of the caller/user to not attempt to use an
incompatible format, which has undefined behavior.
FIXES=[466395306]
* add a new android sample to test the AHardwareBuffer as render target
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Co-authored-by: Powei Feng <powei@google.com>
* API BREAKAGE: this change aims to fix multi-view support
What has changed:
- View doesn't have a notion of clear color anymore
- View doesn't have a notion of discard flags anymore
- The clear color and color-buffer discard/clear flags are moved to Renderer
- Skybox can now be set to a constant color
- View have a blend-mode
What does is all mean:
"Clearing" (i.e.) setting its background is now handled by Skybox, by
setting a constant color to the Skybox. This should take care of
drawing views side by side.
When a view needs to be drawn on top of another, it's BlendMode needs to
be set to TRANSLUCENT and of course and, generally, it wither won't have
a skybox, or will have one that sets some translucent pixels.
As an optimization, a View with BlendMode::OPAQUE will have its
background cleared with the color specified in Renderer.
If the SwapChain already has some content, it's now possible to set
the Renderer to not discard the content, together with TRANSLUCENT views,
it's possible to draw on top of that content.
It is NOT possible to share depth/stencil buffers between views.
Fixes: #2369, #2372, #2364
* Address reviewers comments.
Note: WebGL is still broken with this PR
