Auto merge of #22044 - asajeffrey:magicleap-less-egl-buffer-swapping, r=jdm

Reduce the amount of EGL buffer swapping the ML port is doing

<!-- Please describe your changes on the following line: -->

At the moment, we're swapping the EGL buffers every heartbeat, which produces a lot of flickering. We should only swap the buffers when needed.

---
<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `__` with appropriate data: -->
- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [X] These changes do not require tests because we have no way to test on ML

<!-- Also, please make sure that "Allow edits from maintainers" checkbox is checked, so that we can help you if you get stuck somewhere along the way.-->

<!-- Pull requests that do not address these steps are welcome, but they will require additional verification as part of the review process. -->

<!-- Reviewable:start -->
---
This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/22044)
<!-- Reviewable:end -->

1 files changed, 0 insertions, 16 deletions

diff --git a/support/magicleap/Servo2D/code/src/Servo2D.cpp b/support/magicleap/Servo2D/code/src/Servo2D.cpp
index 8704478e210..9b830ac6ca0 100644
--- a/support/magicleap/Servo2D/code/src/Servo2D.cpp
+++ b/support/magicleap/Servo2D/code/src/Servo2D.cpp
@@ -116,8 +116,6 @@ int Servo2D::init() {
   EGLContext ctx = plane_->getEGLContext();
   EGLSurface surf = plane_->getEGLSurface();
   EGLDisplay dpy = eglGetDisplay(EGL_DEFAULT_DISPLAY);
-  eglMakeCurrent(dpy, surf, surf, ctx);
-  glViewport(0, 0, VIEWPORT_W, VIEWPORT_H);
 
   // Hook into servo
   servo_ = init_servo(ctx, surf, dpy, logger, "https://servo.org/", VIEWPORT_H, VIEWPORT_W, HIDPI);
@@ -127,9 +125,6 @@ int Servo2D::init() {
     return 1;
   }
 
-  // Flush GL
-  glFlush();
-  eglSwapBuffers(dpy, surf);
   return 0;
 }
 
@@ -176,20 +171,9 @@ void Servo2D::instanceInitialScenes() {
 }
 
 bool Servo2D::updateLoop(float fDelta) {
-  // Get the EGL context, surface and display.
-  EGLContext ctx = plane_->getEGLContext();
-  EGLSurface surf = plane_->getEGLSurface();
-  EGLDisplay dpy = eglGetDisplay(EGL_DEFAULT_DISPLAY);
-  eglMakeCurrent(dpy, surf, surf, ctx);
-  glViewport(0, 0, VIEWPORT_W, VIEWPORT_H);
-
   // Hook into servo
   heartbeat_servo(servo_);
 
-  // Flush GL
-  glFlush();
-  eglSwapBuffers(dpy, surf);
-
   // Return true for your app to continue running, false to terminate the app.
   return true;
 }