зеркало из https://github.com/AvaloniaUI/angle.git
117 строки
3.3 KiB
Plaintext
117 строки
3.3 KiB
Plaintext
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Name
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ANGLE_request_extension
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Name Strings
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GL_ANGLE_request_extension
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Contributors
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Geoff Lang
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Contact
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Geoff Lang (geofflang 'at' google.com)
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Notice
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Copyright (c) 2016 The Khronos Group Inc. Copyright terms at
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http://www.khronos.org/registry/speccopyright.html
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Status
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Draft
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Version
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Version 1, November 28, 2016
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Number
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OpenGL ES Extension #??
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Dependencies
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Requires OpenGL ES 2.0
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Written against the OpenGL ES 3.0 specification.
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Overview
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This extension allows the client to query extensions that can be enabled and
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explicitly request than an extension be enabled.
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New Procedures and Functions
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void RequestExtension(const char *name)
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New Tokens
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Accepted by the <name> parameter of GetString and GetStringi:
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REQUESTABLE_EXTENSIONS_ANGLE 0x93A8
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Accepted by the <value> parameter of the GetInteger* functions:
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NUM_REQUESTABLE_EXTENSIONS_ANGLE 0x93A9
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Additions to the OpenGL ES 3.0 Specification
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Add the following paragraph to the end paragraph 4 of section 6.1.6, String
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Queries:
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"REQUESTABLE_EXTENSIONS_ANGLE returns a list of extensions that can be
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enabled at runtime by calling RequestExtension."
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Change the following section of paragraph 6 of section 6.1.6, String Queries:
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- "name may only be EXTENSIONS, indicating that the extension name
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- corresponding to the indexth supported extension should be returned.
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- <index> may range from zero to the value of NUM_EXTENSIONS minus one"
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+ "name may be EXTENSIONS or REQUESTABLE_EXTENSIONS_ANGLE, indicating that
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+ the extension name corresponding to the indexth supported or requestable
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+ extension should be returned. <index> may range from zero to the value of
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+ NUM_EXTENSIONS and NUM_REQUESTABLE_EXTENSIONS_ANGLE minus one"
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The command
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void RequestExtension(const char *name)
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enables the requestable OpenGL ES extension named <name>. If the extension
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was not requestable, INVALID_OPERATION is generated.
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New State
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Add to Table 6.30 (Implementation Dependent Version and Extension Support)
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Get value Type Get Cmd Min Value Description Sec.
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-------------------------------- ---- ----------- --------- -------------------------------- -----
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NUM_REQUESTABLE_EXTENSIONS_ANGLE Z+ GetIntegerv - Number of individual requestable 6.1.6
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extension names
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Interactions with the OpenGL ES 2.0 specification:
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Remove all references to GetStringi and NUM_REQUESTABLE_EXTENSIONS_ANGLE.
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Issues
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(1) How can the user determine which extensions can be enabled without
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potentially generating errors?
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This can be solved by:
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a) Never generate an error in EnableExtensions, simply return false when
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the extension is not recognized or cannot be enabled.
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b) Add another query for the extensions that the context supports
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enabling.
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RESOLVED: Use (b) because it allows the context to explicity advertise
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which extensions support enabling and doesn't generate errors in the
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normal use case.
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Revision History
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Rev. Date Author Changes
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---- ------------- --------- ----------------------------------------
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1 Nov 28, 2016 geofflang Initial version
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