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170 lines
5.4 KiB
Plaintext
170 lines
5.4 KiB
Plaintext
Name
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EXT_create_context_robustness
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Name Strings
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EGL_EXT_create_context_robustness
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Contributors
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Daniel Koch, TransGaming
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Contributors to EGL_KHR_create_context
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Contact
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Greg Roth (groth 'at' nvidia.com)
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Status
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Complete.
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Version
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Version 3, 2011/10/31
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Number
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EGL Extension #37
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Dependencies
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Requires EGL 1.4
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Written against the EGL 1.4 specification.
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An OpenGL implementation supporting GL_ARB_robustness, an OpenGL ES
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implementation supporting GL_EXT_robustness, or an implementation
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supporting equivalent functionality is required.
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Overview
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This extension allows creating an OpenGL or OpenGL ES context
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supporting robust buffer access behavior and a specified graphics
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reset notification behavior.
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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 an attribute name in the <*attrib_list> argument to
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eglCreateContext:
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EGL_CONTEXT_OPENGL_ROBUST_ACCESS_EXT 0x30BF
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EGL_CONTEXT_OPENGL_RESET_NOTIFICATION_STRATEGY_EXT 0x3138
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Accepted as an attribute value for EGL_CONTEXT_RESET_NOTIFICATION_-
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STRATEGY_EXT in the <*attrib_list> argument to eglCreateContext:
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EGL_NO_RESET_NOTIFICATION_EXT 0x31BE
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EGL_LOSE_CONTEXT_ON_RESET_EXT 0x31BF
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Additions to the EGL 1.4 Specification
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Replace section 3.7.1 "Creating Rendering Contexts" from the
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fifth paragraph through the seventh paragraph:
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<attrib_list> specifies a list of attributes for the context. The
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list has the same structure as described for eglChooseConfig. If an
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attribute is not specified in <attrib_list>, then the default value
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specified below is used instead. <attrib_list> may be NULL or empty
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(first attribute is EGL_NONE), in which case attributes assume their
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default values as described below. Most attributes are only meaningful
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for specific client APIs, and will generate an EGL_BAD_ATTRIBUTE
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error when specified to create for another client API context.
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Context Versions
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----------------
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EGL_CONTEXT_CLIENT_VERSION determines which version of an OpenGL ES
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context to create. This attribute may only be specified when creating
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an OpenGL ES context (e.g. when the current rendering API is
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EGL_OPENGL_ES_API). An attribute value of 1 specifies creation of an
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OpenGL ES 1.x context. An attribute value of 2 specifies creation of an
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Open GL ES 2.x context. The default value for EGL_CONTEXT_CLIENT_VERSION
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is 1.
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Context Robust Access
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-------------
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EGL_CONTEXT_OPENGL_ROBUST_ACCESS_EXT indicates whether <robust buffer
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access> should be enabled for the OpenGL ES context. Robust buffer
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access is defined in the GL_EXT_robustness extension specification,
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and the resulting context must support GL_EXT_robustness and robust
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buffer access as described therein. The default value of
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EGL_CONTEXT_OPENGL_ROBUST_ACCESS_EXT is EGL_FALSE.
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Context Reset Notification
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--------------------------
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The attribute name EGL_CONTEXT_OPENGL_RESET_NOTIFICATION_STRATEGY_-
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EXT specifies the <reset notification behavior> of the rendering
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context. This attribute is only meaningful for OpenGL ES contexts,
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and specifying it for other types of contexts will generate an
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EGL_BAD_ATTRIBUTE error.
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Reset notification behavior is defined in the GL_EXT_robustness
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extension for OpenGL ES, and the resulting context must support
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GL_EXT_robustness and the specified reset strategy. The attribute
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value may be either EGL_NO_RESET_NOTIFICATION_EXT or EGL_LOSE_-
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CONTEXT_ON_RESET_EXT, which respectively result in disabling
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delivery of reset notifications or the loss of all context state
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upon reset notification as described by the GL_EXT_robustness. The
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default value for EGL_CONTEXT_OPENGL_RESET_NOTIFICATION_STRATEGY_EXT
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is EGL_NO_RESET_NOTIFICATION_EXT.
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Add to the eglCreateContext context creation errors:
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* If <config> does not support a client API context compatible
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with the requested context flags and context reset notification
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behavior (for client API types where these attributes are
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supported), then an EGL_BAD_CONFIG error is generated.
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* If the reset notification behavior of <share_context> and the
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newly created context are different then an EGL_BAD_MATCH error is
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generated.
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Errors
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EGL_BAD_CONFIG is generated if EGL_CONTEXT_OPENGL_ROBUST_ACCESS_-
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EXT is set to EGL_TRUE and no GL context supporting the GL_EXT_-
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robustness extension and robust access as described therein can be
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created.
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EGL_BAD_CONFIG is generated if no GL context supporting the
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GL_EXT_robustness extension and the specified reset notification
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behavior (the value of attribute EGL_CONTEXT_RESET_NOTIFICATION_-
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STRATEGY_EXT) can be created.
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BAD_MATCH is generated if the reset notification behavior of
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<share_context> does not match the reset notification behavior of
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the context being created.
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New State
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None
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Conformance Tests
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TBD
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Sample Code
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TBD
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Issues
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None
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Revision History
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Rev. Date Author Changes
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---- ------------ --------- ----------------------------------------
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3 31 Oct 2011 groth Reverted to attribute for robust access. Now it's a
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companion to rather than subset of KHR_create_context
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2 11 Oct 2011 groth Merged ANGLE and NV extensions.
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1 15 July 2011 groth Initial version
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