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Name
ANGLE_vulkane_image
Name Strings
GL_ANGLE_vulkane_image
Contributors
Peng Huang, Google
Contact
Peng Huang, Google (penghuang 'at' chromium.com)
Status
Draft
Version
Last Modified Date: Nov 19, 2021
Revision: 1
Number
TBD
Dependencies
Written against the OpenGL 4.5 and OpenGL ES 3.2 specifications
GL_ANGLE_vulkane_image requires GL_EXT_external_objects
Overview
Building upon the OpenGL memory object and semaphore framework
defined in EXT_external_objects, this extension enables an OpenGL
application to share textures with an external API.
New Procedures and Functions
If the GL_ANGLE_vulkane_image string is reported, the following commands
are added:
void AcquireTexturesANGLE(uint numTextures,
const uint *textures,
const GLenum *layouts);
void ReleaseTexturesANGLE(uint numTextures,
const uint *textures,
GLenum *layouts);
New Tokens
None
Additions to Chapter 4 of the OpenGL 4.5 Specification (Event Model)
The command
void AcquireTexturesANGLE(uint numTextures,
const uint *textures,
const GLenum *layouts);
will acquire ownership of textures. Since the texture layout state is
managed internally by the GL, but may have been modified by an external API,
the current layout of the textures must be specified to initialize internal
GL state prior to correspond to those specified by the Vulkan API as
described in table 4.4. However, the layouts do not necessarily correspond
to an optimal state for any particular GL operation. The GL will simply
perform appropriate transitions internally as necessary based on the
specified current layout of the texture.
The command
void ReleaseTexturesANGLE(uint numTextures,
const uint *textures,
GLenum *layouts);
will release ownership of textures. The current texture layouts will be
returned, so an external API can perform appropriate transitions as
necessary based on the returned current layout of the textures.
Revision History
Revision 1, 2021-11-19 (Peng Huang)
- Initial draft based closely on EXT_external_objects_fd.
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