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https://review.haiku-os.org/haiku
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101 lines
2.4 KiB
Plaintext
101 lines
2.4 KiB
Plaintext
Name
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KHR_platform_haiku
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Name Strings
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EGL_KHR_platform_haiku
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Contributors
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Alexander von Gluck IV <alex@terarocket.io>
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Contacts
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Alexander von Gluck IV <alex@terarocket.io>
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Status
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Draft.
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Version
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Version 1, 2023/03/29
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Number
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EGL Extension TBD
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Extension Type
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EGL client extension
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Dependencies
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EGL 1.5 is required.
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This extension is written against the EGL 1.5 Specification (draft
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20140122).
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Overview
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This extension defines how to create EGL resources from native Haiku
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resources using the EGL 1.5 platform functionality.
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Mesa has tracked _EGL_PLATFORM_HAIKU internally for quite some time.
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libglvnd has received patches for basic Haiku support
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New Types
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None
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New Procedures and Functions
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None
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New Tokens
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Accepted as the <platform> argument of eglGetPlatformDisplay:
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EGL_PLATFORM_HAIKU_KHR 0x31D9
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Additions to the EGL Specification
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None.
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New Behavior
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To determine if the EGL implementation supports this extension, clients
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should query the EGL_EXTENSIONS string of EGL_NO_DISPLAY.
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To obtain an EGLDisplay backed by a Haiku display, call
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eglGetPlatformDisplay with <platform> set to EGL_PLATFORM_HAIKU_KHR. The
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<native_display> parameter specifies the Haiku display to use and must
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either point to a `struct wl_display` or be EGL_DEFAULT_DISPLAY. If
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<native_display> is EGL_DEFAULT_DISPLAY, then EGL will create a new
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wl_display structure by connecting to the default Wayland socket. The
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manual page wl_display_connect(3) defines the location of the default
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Wayland socket.
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To obtain an on-screen rendering surface from a Wayland window, call
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eglCreatePlatformWindowSurface with a <dpy> that belongs to Wayland and
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a <native_window> that points to a `struct wl_egl_surface`.
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It is not valid to call eglCreatePlatformPixmapSurface with a <dpy> that
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belongs to Haiku. Any such call fails and generates an
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EGL_BAD_PARAMETER error.
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Rendering to the obtained EGLSurface or querying it with EGL_BUFFER_AGE_KHR
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will lock its back buffer preventing it from being dropped or resized,
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until the next buffer swap. The rationale behind this behavior is to keep
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operations result accurate until the next swap.
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Issues
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TBD
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Revision History
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Version 1, 2023/03/29 (Alexander von Gluck IV)
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- Initial Draft version for Haiku with EGL 1.5+
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