* Add option for showing the overlay behind the menu
This commit lays the groundwork for this option. Support for this option
in the video drivers themselves is going to be added in later commits.
* gl1: Add overlay behind menu support
* gl2: Add overlay behind menu support
* gl3: Add overlay behind menu support
* vulkan: Add overlay behind menu support
* ctr: Add overlay behind menu support
* d3d9: Add overlay behind menu support
* d3d10: Add overlay behind menu support
* d3d11: Add overlay behind menu support
* d3d12: Add overlay behind menu support
* CHANGES.md: overlay behind menu
Co-authored-by: MrHuu <MrHuu@users.noreply.github.com>
Co-authored-by: Tony <45124675+sonninnos@users.noreply.github.com>
done for Z-Turn board) - has some outstanding issues such as
very slow framebuffer software rendering output that needs to
be overcome before this becomes usable - community help needed
This driver should sunset the old gl2 driver, but that driver will
likely live on to support really ancient and terrible GL stacks.
All the worst legacy cruft has been ripped out, and it's almost a decent
backend now.
Requirements for slang are GL 3.2+ or GLES3.
Some shaders require features which are not directly compatible with
GLES2 or legacy GL.
This driver shares a lot of concepts from the Vulkan driver.
The slang shader stack and SPIRV-Cross are used to implement the shader
spec, and the menu shaders are also shared with Vulkan.
