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Revise documentation on adding EGL extensions.

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Provided more links and steps per earlier advice from geofflang@.

Bug: angleproject:4842
No-Try: true
Change-Id: I9c9361b4b71a63fd36f79a87d45e0f4b04c4140c
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2297528
Commit-Queue: Kenneth Russell <kbr@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>
This commit is contained in:
Kenneth Russell
2020-07-14 17:26:27 -07:00
committed by Commit Bot
parent dd4723e36b
commit 5927706bfa
1 changed files with 22 additions and 13 deletions
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35
doc/AddingExtensions.md
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@@ -10,28 +10,37 @@ of these steps.
For extensions requiring new entry points:
* Add the extension xml to this file:
https://source.chromium.org/chromium/chromium/src/+/master:third_party/angle/scripts/egl_angle_ext.xml
* Add the extension xml to
[scripts/egl_angle_ext.xml](../scripts/egl_angle_ext.xml) .
* Note the prototypes for the new entry points must be added to the
top of the file, and the functions themselves grouped under the
extension name to the bottom of the file.
* Modify `scripts/registry_xml.py` to add the new extension as needed.
* Modify [scripts/registry_xml.py](../scripts/registry_xml.py) to add
the new extension as needed.
* run
[scripts/run_code_generation.py](https://source.chromium.org/chromium/chromium/src/+/master:third_party/angle/scripts/run_code_generation.py)
* Run
[scripts/run_code_generation.py](../scripts/run_code_generation.py)
.
* The entry point itself goes in the
[entry_points_egl_ext.h](https://source.chromium.org/chromium/chromium/src/+/master:third_party/angle/src/libGLESv2/entry_points_egl_ext.h)
and cpp files.
* The entry point itself goes in
[entry_points_egl_ext.h](../src/libGLESv2/entry_points_egl_ext.h)
and
[entry_points_egl_ext.cpp](../src/libGLESv2/entry_points_egl_ext.cpp)
.
* Update
[eglext_angle.h](https://source.chromium.org/chromium/chromium/src/+/master:third_party/angle/include/EGL/eglext_angle.h)
with the new entry points and/or enums.
* Add the new function to [libEGL.cpp](../src/libEGL/libEGL.cpp) and
[libEGL.def](../src/libEGL/libEGL.def) .
* Update [eglext_angle.h](../include/EGL/eglext_angle.h) with the new
entry points and/or enums.
* Add members to the appropriate Extensions struct in
[Caps.h](https://source.chromium.org/chromium/chromium/src/+/master:third_party/angle/src/libANGLE/Caps.h)
[Caps.h](../src/libANGLE/Caps.h) and
[Caps.cpp](../src/libANGLE/Caps.cpp) .
* Initialize extension availability in the `Display` subclass's
`generateExtensions` method for displays that can support the extension.
`generateExtensions` method for displays that can support the
extension; for example,
[DisplayCGL](../src/libANGLE/renderer/gl/cgl/DisplayCGL.mm).