kc3-lang/angle/extensions/ANGLE_robust_resource_initialization.txt

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• Author : Shannon Woods
  Date : 2015-01-07 19:01:34
  Hash : c7ea21fa
  Message : Adds new robust initialization extensions. Change-Id: I66d2ebbb0ce89bbfd1eda648e9ad0fb2edee0f31 Reviewed-on: https://chromium-review.googlesource.com/239286 Reviewed-by: Kenneth Russell <kbr@chromium.org> Reviewed-by: Shannon Woods <shannonwoods@chromium.org> Tested-by: Shannon Woods <shannonwoods@chromium.org>

• extensions/ANGLE_robust_resource_initialization.txt

• Name
  
      ANGLE_robust_resource_initialization.txt
  
  Name Strings
  
      ANGLE_robust_resource_intialization
  
  Contributors
  
      Geoff Lang, Google
      Ken Russell, Google
  
  Contacts
  
      Shannon Woods, Google (shannonwoods 'at' google.com)
  
  Status
  
      Draft
  
  Version
  
      Version 1, January 7, 2015
  
  Number
  
      OpenGL ES Extension TBD
  
  Dependencies
  
      OpenGL ES 2.0 is required.
  
      This extension is written against the wording of the OpenGL ES
      3.1 specification.
  
      EGL_EXT_create_context_robust_initialization is used to request a
      context supporting this extension to perform resource initialization.
  
  Overview
  
      This extension specifies the behavior for initialization of
      resources such as textures and buffers to default values. This
      initialization ensures that access will not be provided by the
      GL to previously allocated data not owned by the application.
  
  New Types
  
      None
  
  New Procedures and Functions
  
      None
  
  New Tokens
  
      Accepted by the <value> parameter of GetBooleanv, GetIntegerv,
      GetFloatv, GetDoublev, and GetInteger54v:
  
          CONTEXT_ROBUST_RESOURCE_INITIALIZATION_ANGLE    0x93A7
  
  
  Additions to Chapter 6 of the OpenGL ES 3.1 Specification (Buffer
  Objects)
  
      Replace the last sentence of the first paragraph of section 6.2
      "BufferData":
  
      If <data> is NULL, and robust resource initialization is enabled,
      the contents of the buffer object's data store are set to zero.
      Otherwise, the contents of the buffer object's data store are
      undefined.
  
  Additions to Chapter 8 of the OpenGL ES 3.1 Specification (Textures and
  Samplers)
  
      Replace the first two sentances of the final paragraph in section
      8.5.3 "Texture Image Structure":
  
      If the <data> argument of TexImage2D or TexImage3D is NULL, and the
      pixel unpack buffer object is zero, a two- or three-dimensional
      texel array is created with the specified <target>, <level>,
      <internalformat>, <border>, <width>, <height>, and <depth>. If
      robust resource initialization is enabled, the contents of the image
      are initialized as though a zero value were provided for each
      component of each pixel, and processed and transferred to the GL
      as described above. The components comprising this zero-filled data
      are determined by <internalformat>. If robust resource
      initialization is not enabled, the image contents are undefined, and
      no pixel processing is performed. In either case, no pixel values
      are accessed in client memory.
  
      Replace the first sentence of the fifth paragraph in section 8.8
      "Multisample Textures":
  
      Upon success, TexStorage2DMultisample deletes any existing image
      for target. If robust resource initialization is enabled, the
      contents of each texel are initialized as though a zero value were
      written to each channel of each sample; otherwise the contents of
      texels are undefined.
  
      Add to the final paragraph of section 8.17 "Immutable-Format Texture
      Images":
  
      If robust resource initialization is enabled, the contents of each
      texel is initialized as though a zero value were provided for each
      component of each pixel, and processed and transferred to the GL
      as for a call to the appropriate TexSubImage* call for <target>.
      Otherwise, the contents of texels are undefined.
  
  Additions to Chapter 9 of the OpenGL ES 3.1 Specification (Framebuffers
  and Framebuffer Objects)
  
      Replace the sentence in section 9.2.4 "Renderbuffer Objects"
      beginning "Upon success, RenderbufferStorageMultisample":
  
      Upon success, RenderbufferStorageMultisample deletes any existing
      data store for the renderbuffer image. If robust resource
      initialization is enabled, the contents of each pixel in the data
      store are initialized as though a zero value was written to each
      channel of each sample; otherwise, the contents of the data store
      are undefined.
  
  Interactions with EGL_ANGLE_create_context_robust_resource
  
      If the EGL window-system binding API is used to create a context,
      the EGL_ANGLE_create_context_robust_initialization extension is
      supported, and the attribute
      EGL_CONTEXT_OPENGL_ROBUST_INITIALIZATION_ANGLE is set to
      EGL_TRUE when eglCreateContext is called, the resulting context
      will perform robust resource initialization as described above in
      section <section>, and the
      CONTEXT_ROBUST_RESOURCE_INITIALIZATION_ANGLE
      query will return GL_TRUE as described above in section 2.6.1.1.
  
  Issues
  
      None
  
  Revision History
  
      Version 1, 2015/01/07 - first draft.