These changes make it easier to test headless rendering in macOS.
I verified that this works using the frame_generator tool, however
it requires the fixes in PR #2529.
This is done for consistency with the Android samples. Tested with
gltf_viewer against Vulkan, Metal, and OpenGL. Dragged window between
high DPI and low DPI displays.
Since resizing does not trigger the "NSView has changed" handler in
PlatformCocoaGL, it now must to detect a resize in order to make the
required call to NSOpenGLContext::update() as per the following
documentation.
https://developer.apple.com/documentation/appkit/nsopenglcontext/1436135-updateFixes#2528
- there was a case where setting a clear color on the Renderer
would clear a blended view with that color instead of transparent
pixels.
- move configuring the ui view into ImGuiHelper
- fix gltf_viewer sidebar so its background is not uninitialized
* 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
