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Name
EXT_multiview_window
Name Strings
EGL_EXT_multiview_window
Contributors
Acorn Pooley
Greg Roth
Contacts
Greg Roth (groth 'at' nvidia.com)
Status
Complete
Version
Version 3, Sept 03, 2011
Number
EGL Extension #42
Dependencies
Requires EGL 1.4
Written against the EGL 1.4 specification.
Overview
Adds support for creating an onscreen EGLSurface containing
multiple color buffers.
EXT_multi_draw_buffers can be used with this extension to
render and display multiple color buffers to a supported
device.
New Types
None
New Procedures and Functions
None
New Tokens
Accepted as an attribute in the <attrib_list> parameter of
CreateWindowSurface:
EGL_MULTIVIEW_VIEW_COUNT_EXT 0x3134
Additions to Chapter 3 of the EGL 1.2 Specification:
Additions to section 3.5.1 (Creating On-Screen Rendering Surfaces)
Alter the end of the second paragraph:
Attributes that can be specified in <attrib_list> include
EGL_RENDER_BUFFER, EGL_VG_COLORSPACE, EGL_VG_ALPHA_FORMAT, and
EGL_MULTIVIEW_VIEW_COUNT_EXT.
Add before the last paragraph of section 3.5.1:
EGL_MULTIVIEW_VIEW_COUNT_EXT specifies how many multiview color
buffers should be created for the surface. Each color buffer has
the same properties as the primary color buffer as specified by
window and surface attributes. The default value of
EGL_MULTIVIEW_VIEW_COUNT_EXT is one.
EGL may not be able to create as many multiview color buffers as
EGL_MULTIVIEW_VIEW_COUNT_EXT specifies. To determine the number
of multiview color buffers created by a context, call
eglQueryContext (see section 3.7.4).
Add to the last paragraph of section 3.5.1:
If the value specified for EGL_MULTIVIEW_VIEW_COUNT_EXT is less
than one, an EGL_BAD_PARAMETER error is generated. If the value
specified for EGL_MULTIVIEW_VIEW_COUNT_EXT is greater than one
and the <config> does not support multiple multiview color
buffers, an EGL_BAD_MATCH error is generated.
Additions to section 3.5.6 (Surface Attributes)
Add to table 3.5, "Queryable surface attributes and types"
Attribute Type Description
--------- ---- -----------
EGL_MULTIVIEW_VIEW_COUNT_EXT integer Requested multiview
color buffers
Add before the last paragraph describing eglQuerySurface:
Querying EGL_MULTIVIEW_VIEW_COUNT_EXT for a window surface
returns the number of multiview color buffers requested. For a
pbuffer or pixmap surface, the contents of <value> are not
modified. To determine the actual number of multiview color
buffers created by a context, call eglQueryContext (see
section 3.7.4).
Additions to section 3.7.4 (Context Queries)
Add before the last paragraph describing eglQueryContext:
Querying EGL_MULTIVIEW_VIEW_COUNT_EXT returns the number of
multiview color buffers created. The value returned depends on
properties of both the context, and the surface to which the
context is bound.
Issues
None
Revision History
Version 3, 03 Sept 2011 EXTify add support for multiple or single depth buffer.
Version 2, 02 Aug 2011 Responses to feedback.
Version 1, 14 April 2011 First draft.
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