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angle/doc/AddingExtensions.md

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Improve EGL_ANGLE_power_preference on dual-GPU MacBook Pros. Add the ability to release and reacquire the high-power GPU, and to respond to changes in the active GPU. In Chromium, the GPU process can not access the WindowServer. An external process must inform ANGLE that the active GPU has changed, and that ANGLE should switch its internal context to the new GPU. Incorporates a couple of functions from WebKit, used with permission, to effect this GPU switch. A follow-on change in Chromium which uses these new APIs will make the existing dual-GPU tests pass with ANGLE and the passthrough command decoder. Carry forward Chromium's workaround of disabling GPU switching on older MacBook Pros to ensure stability. Document the process of adding new EGL extensions to ANGLE. Bug: chromium:1091824 Change-Id: I499739156e851b493555d4d6e4aef87d8b97fa31 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2240638 Commit-Queue: Kenneth Russell <kbr@chromium.org> Reviewed-by: Jonah Ryan-Davis <jonahr@google.com> Reviewed-by: Geoff Lang <geofflang@chromium.org>
2020-06-11 07:55:43 +03:00
# Introduction
This page describes how to add new extensions to ANGLE.
# Adding EGL extensions
Note: see also [anglebug.com/2621](http://anglebug.com/2621), linked
from the [starter project](Starter-Projects.md) doc, to simplify some
of these steps.
For extensions requiring new entry points:
Revise documentation on adding EGL extensions. 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>
2020-07-15 03:26:27 +03:00
* Add the extension xml to
[scripts/egl_angle_ext.xml](../scripts/egl_angle_ext.xml) .
Improve EGL_ANGLE_power_preference on dual-GPU MacBook Pros. Add the ability to release and reacquire the high-power GPU, and to respond to changes in the active GPU. In Chromium, the GPU process can not access the WindowServer. An external process must inform ANGLE that the active GPU has changed, and that ANGLE should switch its internal context to the new GPU. Incorporates a couple of functions from WebKit, used with permission, to effect this GPU switch. A follow-on change in Chromium which uses these new APIs will make the existing dual-GPU tests pass with ANGLE and the passthrough command decoder. Carry forward Chromium's workaround of disabling GPU switching on older MacBook Pros to ensure stability. Document the process of adding new EGL extensions to ANGLE. Bug: chromium:1091824 Change-Id: I499739156e851b493555d4d6e4aef87d8b97fa31 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2240638 Commit-Queue: Kenneth Russell <kbr@chromium.org> Reviewed-by: Jonah Ryan-Davis <jonahr@google.com> Reviewed-by: Geoff Lang <geofflang@chromium.org>
2020-06-11 07:55:43 +03:00
* 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.
Revise documentation on adding EGL extensions. 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>
2020-07-15 03:26:27 +03:00
* Modify [scripts/registry_xml.py](../scripts/registry_xml.py) to add
the new extension as needed.
Improve EGL_ANGLE_power_preference on dual-GPU MacBook Pros. Add the ability to release and reacquire the high-power GPU, and to respond to changes in the active GPU. In Chromium, the GPU process can not access the WindowServer. An external process must inform ANGLE that the active GPU has changed, and that ANGLE should switch its internal context to the new GPU. Incorporates a couple of functions from WebKit, used with permission, to effect this GPU switch. A follow-on change in Chromium which uses these new APIs will make the existing dual-GPU tests pass with ANGLE and the passthrough command decoder. Carry forward Chromium's workaround of disabling GPU switching on older MacBook Pros to ensure stability. Document the process of adding new EGL extensions to ANGLE. Bug: chromium:1091824 Change-Id: I499739156e851b493555d4d6e4aef87d8b97fa31 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2240638 Commit-Queue: Kenneth Russell <kbr@chromium.org> Reviewed-by: Jonah Ryan-Davis <jonahr@google.com> Reviewed-by: Geoff Lang <geofflang@chromium.org>
2020-06-11 07:55:43 +03:00
Revise documentation on adding EGL extensions. 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>
2020-07-15 03:26:27 +03:00
* Run
[scripts/run_code_generation.py](../scripts/run_code_generation.py)
.
Improve EGL_ANGLE_power_preference on dual-GPU MacBook Pros. Add the ability to release and reacquire the high-power GPU, and to respond to changes in the active GPU. In Chromium, the GPU process can not access the WindowServer. An external process must inform ANGLE that the active GPU has changed, and that ANGLE should switch its internal context to the new GPU. Incorporates a couple of functions from WebKit, used with permission, to effect this GPU switch. A follow-on change in Chromium which uses these new APIs will make the existing dual-GPU tests pass with ANGLE and the passthrough command decoder. Carry forward Chromium's workaround of disabling GPU switching on older MacBook Pros to ensure stability. Document the process of adding new EGL extensions to ANGLE. Bug: chromium:1091824 Change-Id: I499739156e851b493555d4d6e4aef87d8b97fa31 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2240638 Commit-Queue: Kenneth Russell <kbr@chromium.org> Reviewed-by: Jonah Ryan-Davis <jonahr@google.com> Reviewed-by: Geoff Lang <geofflang@chromium.org>
2020-06-11 07:55:43 +03:00
Revise documentation on adding EGL extensions. 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>
2020-07-15 03:26:27 +03:00
* 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)
.
Improve EGL_ANGLE_power_preference on dual-GPU MacBook Pros. Add the ability to release and reacquire the high-power GPU, and to respond to changes in the active GPU. In Chromium, the GPU process can not access the WindowServer. An external process must inform ANGLE that the active GPU has changed, and that ANGLE should switch its internal context to the new GPU. Incorporates a couple of functions from WebKit, used with permission, to effect this GPU switch. A follow-on change in Chromium which uses these new APIs will make the existing dual-GPU tests pass with ANGLE and the passthrough command decoder. Carry forward Chromium's workaround of disabling GPU switching on older MacBook Pros to ensure stability. Document the process of adding new EGL extensions to ANGLE. Bug: chromium:1091824 Change-Id: I499739156e851b493555d4d6e4aef87d8b97fa31 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2240638 Commit-Queue: Kenneth Russell <kbr@chromium.org> Reviewed-by: Jonah Ryan-Davis <jonahr@google.com> Reviewed-by: Geoff Lang <geofflang@chromium.org>
2020-06-11 07:55:43 +03:00
Revise documentation on adding EGL extensions. 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>
2020-07-15 03:26:27 +03:00
* 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.
Improve EGL_ANGLE_power_preference on dual-GPU MacBook Pros. Add the ability to release and reacquire the high-power GPU, and to respond to changes in the active GPU. In Chromium, the GPU process can not access the WindowServer. An external process must inform ANGLE that the active GPU has changed, and that ANGLE should switch its internal context to the new GPU. Incorporates a couple of functions from WebKit, used with permission, to effect this GPU switch. A follow-on change in Chromium which uses these new APIs will make the existing dual-GPU tests pass with ANGLE and the passthrough command decoder. Carry forward Chromium's workaround of disabling GPU switching on older MacBook Pros to ensure stability. Document the process of adding new EGL extensions to ANGLE. Bug: chromium:1091824 Change-Id: I499739156e851b493555d4d6e4aef87d8b97fa31 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2240638 Commit-Queue: Kenneth Russell <kbr@chromium.org> Reviewed-by: Jonah Ryan-Davis <jonahr@google.com> Reviewed-by: Geoff Lang <geofflang@chromium.org>
2020-06-11 07:55:43 +03:00
* Add members to the appropriate Extensions struct in
Revise documentation on adding EGL extensions. 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>
2020-07-15 03:26:27 +03:00
[Caps.h](../src/libANGLE/Caps.h) and
[Caps.cpp](../src/libANGLE/Caps.cpp) .
Improve EGL_ANGLE_power_preference on dual-GPU MacBook Pros. Add the ability to release and reacquire the high-power GPU, and to respond to changes in the active GPU. In Chromium, the GPU process can not access the WindowServer. An external process must inform ANGLE that the active GPU has changed, and that ANGLE should switch its internal context to the new GPU. Incorporates a couple of functions from WebKit, used with permission, to effect this GPU switch. A follow-on change in Chromium which uses these new APIs will make the existing dual-GPU tests pass with ANGLE and the passthrough command decoder. Carry forward Chromium's workaround of disabling GPU switching on older MacBook Pros to ensure stability. Document the process of adding new EGL extensions to ANGLE. Bug: chromium:1091824 Change-Id: I499739156e851b493555d4d6e4aef87d8b97fa31 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2240638 Commit-Queue: Kenneth Russell <kbr@chromium.org> Reviewed-by: Jonah Ryan-Davis <jonahr@google.com> Reviewed-by: Geoff Lang <geofflang@chromium.org>
2020-06-11 07:55:43 +03:00
* Initialize extension availability in the `Display` subclass's
Revise documentation on adding EGL extensions. 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>
2020-07-15 03:26:27 +03:00
`generateExtensions` method for displays that can support the
extension; for example,
[DisplayCGL](../src/libANGLE/renderer/gl/cgl/DisplayCGL.mm).