diff options
Diffstat (limited to 'mesalib/docs/specs')
-rw-r--r-- | mesalib/docs/specs/MESA_texture_array.spec | 2 | ||||
-rw-r--r-- | mesalib/docs/specs/WL_create_wayland_buffer_from_image.spec | 101 |
2 files changed, 102 insertions, 1 deletions
diff --git a/mesalib/docs/specs/MESA_texture_array.spec b/mesalib/docs/specs/MESA_texture_array.spec index b146821f7..3e3e82cf3 100644 --- a/mesalib/docs/specs/MESA_texture_array.spec +++ b/mesalib/docs/specs/MESA_texture_array.spec @@ -16,7 +16,7 @@ IP Status Status - Shipping in Mesa 7.1 + DEPRECATED - Support removed in Mesa 10.1. Version diff --git a/mesalib/docs/specs/WL_create_wayland_buffer_from_image.spec b/mesalib/docs/specs/WL_create_wayland_buffer_from_image.spec new file mode 100644 index 000000000..aa5eb4d24 --- /dev/null +++ b/mesalib/docs/specs/WL_create_wayland_buffer_from_image.spec @@ -0,0 +1,101 @@ +Name + + WL_create_wayland_buffer_from_image + +Name Strings + + EGL_WL_create_wayland_buffer_from_image + +Contributors + + Neil Roberts + Axel Davy + Daniel Stone + +Contact + + Neil Roberts <neil.s.roberts@intel.com> + +Status + + Proposal + +Version + + Version 2, October 25, 2013 + +Number + + EGL Extension #not assigned + +Dependencies + + Requires EGL 1.4 or later. This extension is written against the + wording of the EGL 1.4 specification. + + EGL_KHR_base_image is required. + +Overview + + This extension provides an entry point to create a wl_buffer which shares + its contents with a given EGLImage. The expected use case for this is in a + nested Wayland compositor which is using subsurfaces to present buffers + from its clients. Using this extension it can attach the client buffers + directly to the subsurface without having to blit the contents into an + intermediate buffer. The compositing can then be done in the parent + compositor. + + The nested compositor can create an EGLImage from a client buffer resource + using the existing WL_bind_wayland_display extension. It should also be + possible to create buffers using other types of images although there is + no expected use case for that. + +IP Status + + Open-source; freely implementable. + +New Procedures and Functions + + struct wl_buffer *eglCreateWaylandBufferFromImageWL(EGLDisplay dpy, + EGLImageKHR image); + +New Tokens + + None. + +Additions to the EGL 1.4 Specification: + + To create a client-side wl_buffer from an EGLImage call + + struct wl_buffer *eglCreateWaylandBufferFromImageWL(EGLDisplay dpy, + EGLImageKHR image); + + The returned buffer will share the contents with the given EGLImage. Any + updates to the image will also be updated in the wl_buffer. Typically the + EGLImage will be generated in a nested Wayland compositor using a buffer + resource from a client via the EGL_WL_bind_wayland_display extension. + + If there was an error then the function will return NULL. In particular it + will generate EGL_BAD_MATCH if the implementation is not able to represent + the image as a wl_buffer. The possible reasons for this error are + implementation-dependant but may include problems such as an unsupported + format or tiling mode or that the buffer is in memory that is inaccessible + to the GPU that the given EGLDisplay is using. + +Issues + + 1) Under what circumstances can the EGL_BAD_MATCH error be generated? Does + this include for example unsupported tiling modes? + + RESOLVED: Yes, the EGL_BAD_MATCH error can be generated for any reason + which prevents the implementation from representing the image as a + wl_buffer. For example, these problems can be but are not limited to + unsupported tiling modes, inaccessible memory or an unsupported pixel + format. + +Revision History + + Version 1, September 6, 2013 + Initial draft (Neil Roberts) + Version 2, October 25, 2013 + Added a note about more possible reasons for returning EGL_BAD_FORMAT. |