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210 lines
8.1 KiB
210 lines
8.1 KiB
4 months ago
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Name
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ANGLE_robust_resource_initialization
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Name Strings
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GL_ANGLE_robust_resource_initialization
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Contributors
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Geoff Lang, Google
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Ken Russell, Google
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Contacts
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Shannon Woods, Google (shannonwoods 'at' google.com)
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Status
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Draft
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Version
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Version 3, September 19, 2017
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Number
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OpenGL ES Extension TBD
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Dependencies
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OpenGL ES 2.0 is required.
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This extension is written against the wording of the OpenGL ES
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3.1 specification.
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EGL_ANGLE_robust_initialization is required to request a
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context that supports this extension, and resource initialization.
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Overview
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This extension specifies the behavior for initialization of
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resources such as textures and buffers to default values. This
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initialization ensures that access will not be provided by the
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GL to previously allocated data not owned by the application.
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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 by the <value> parameter of GetBooleanv, GetIntegerv,
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GetFloatv, GetDoublev, GetInteger64v, and IsEnabled:
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ROBUST_RESOURCE_INITIALIZATION_ANGLE 0x93A7
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Accepted by the <pname> parameter of GetTexParameteriv,
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GetTexParameterfv, GetTexLevelParameteriv, GetTexLevelParameterfv,
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GetRenderbufferParameteriv, GetBufferParameteriv and
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GetBufferParameteri64v:
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RESOURCE_INITIALIZED_ANGLE 0x969F
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Additions to Chapter 6 of the OpenGL ES 3.1 Specification (Buffer
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Objects)
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Replace the last sentence of the first paragraph of section 6.2
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"BufferData":
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If <data> is NULL, and robust resource initialization is enabled,
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the contents of the buffer object's data store are set to zero.
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Otherwise, the contents of the buffer object's data store are
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undefined.
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Add to Table 6.2: Buffer object parameters and their values:
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Name Type Initial Value Legal Values
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---- ---- ------------- ------------
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RESOURCE_INITIALIZED_ANGLE boolean TRUE TRUE, FALSE
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Additions to Chapter 8 of the OpenGL ES 3.1 Specification (Textures and
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Samplers)
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Replace the first two sentances of the final paragraph in section
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8.5.3 "Texture Image Structure":
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If the <data> argument of TexImage2D or TexImage3D is NULL, and the
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pixel unpack buffer object is zero, a two- or three-dimensional
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texel array is created with the specified <target>, <level>,
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<internalformat>, <border>, <width>, <height>, and <depth>. If
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robust resource initialization is enabled, the contents of the image
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are initialized as though a zero value were provided for each
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component of each pixel, and processed and transferred to the GL
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as described above. The components comprising this zero-filled data
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are determined by <internalformat>. If robust resource
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initialization is not enabled, the image contents are undefined, and
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no pixel processing is performed. In either case, no pixel values
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are accessed in client memory.
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Replace the first sentence of the fifth paragraph in section 8.8
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"Multisample Textures":
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Upon success, TexStorage2DMultisample deletes any existing image
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for target. If robust resource initialization is enabled, the
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contents of each texel are initialized as though a zero value were
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written to each channel of each sample; otherwise the contents of
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texels are undefined.
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Add to the final paragraph of section 8.17 "Immutable-Format Texture
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Images":
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If robust resource initialization is enabled, the contents of each
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texel is initialized as though a zero value were provided for each
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component of each pixel, and processed and transferred to the GL
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as for a call to the appropriate TexSubImage* call for <target>.
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Otherwise, the contents of texels are undefined.
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Add to Table 8.20: Texture parameters and their values:
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Name Type Legal Values
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---- ---- ------------
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RESOURCE_INITIALIZED_ANGLE boolean TRUE, FALSE
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Add to the end of section 8.10.3 "Texture Level Parameter Queries":
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Queries of pname RESOURCE_INITIALIZED_ANGLE return the initialization
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state of the image.
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Additions to Chapter 9 of the OpenGL ES 3.1 Specification (Framebuffers
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and Framebuffer Objects)
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Replace the sentence in section 9.2.4 "Renderbuffer Objects"
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beginning "Upon success, RenderbufferStorageMultisample":
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Upon success, RenderbufferStorageMultisample deletes any existing
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data store for the renderbuffer image. If robust resource
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initialization is enabled, the contents of each pixel in the data
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store are initialized as though a zero value was written to each
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channel of each sample; otherwise, the contents of the data store
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are undefined.
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Add to the end of section 9.2.6 "Renderbuffer Object Queries":
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If pname is RESOURCE_INITIALIZED_ANGLE then params will contain the
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initialization state of the renderbuffer currently bound to target.
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Interactions with EGL_ANGLE_create_context_robust_resource_initialization
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If the EGL window-system binding API is used to create a context,
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the EGL_ANGLE_create_context_robust_initialization extension is
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supported, and the attribute
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EGL_CONTEXT_ROBUST_RESOURCE_INITIALIZATION_ANGLE is set to
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EGL_TRUE when eglCreateContext is called, the resulting context
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will perform robust resource initialization as described above in
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section <section>, and the
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CONTEXT_ROBUST_RESOURCE_INITIALIZATION_ANGLE
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query will return GL_TRUE as described above in section 2.6.1.1.
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Otherwise queries will return GL_FALSE.
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New State
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(add to Table 20.4: Buffer Object State)
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Initial
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Get Value Type Get Command Value Description Sec.
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---------------------- ---- ------------------- ------ --------------------------- ------
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RESOURCE_INITIALIZED_ANGLE B GetBufferParameteriv TRUE Buffer data has been 6.6
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initialized
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(add to Table 20.9: Textures (state per texture object))
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Initial
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Get Value Type Get Command Value Description Sec.
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---------------------- ---- ------------------- ------ --------------------------- ------
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RESOURCE_INITIALIZED_ANGLE B GetTexParameteriv TRUE All specified images have 8.10.2
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been initialized
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(add to Table 20.10 Textures (state per texture image))
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Initial
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Get Value Type Get Command Value Description Sec.
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---------------------- ---- ------------------- ------ --------------------------- ------
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RESOURCE_INITIALIZED_ANGLE B GetTexLevelParameteriv TRUE Image data has been 8.10.3
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initialized
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(add to Table 20.16: Renderbuffer (state per renderbuffer object))
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Initial
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Get Value Type Get Command Value Description Sec.
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---------------------- ---- ------------------- ------ --------------------------- ------
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RESOURCE_INITIALIZED_ANGLE B GetRenderbufferParameteriv TRUE Renderbuffer data has been 9.2.6
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initialized
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Issues
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None
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Revision History
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Version 1, 2015/01/07 - first draft.
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Version 2, 2017/03/07 - fixed EGL naming and added IsEnabled.
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Version 3, 2017/09/19 - name cleanup.
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Version 4, 2020/10/12 - Add RESOURCE_INITIALIZED_ANGLE queries.
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