Brandon DeRosier 40c0cdea26 [Impeller] Fix shader depth assignment & glyph atlas transform. (flutter/engine#51343) ...

Resolves https://github.com/flutter/flutter/issues/144333.

This patch fixes two things:
* Absorb the homogenous component of the position before overriding the depth in all shaders that take a depth value. This ensures the transform can't end up affecting the depth.
* The glyph atlas transform: The same as @jason-simmons's fix in https://github.com/flutter/flutter/issues/144333#issuecomment-1986679500.

Before:
![Screenshot 2024-03-11 at 4 37 27 PM](https://github.com/flutter/engine/assets/919017/225171c0-87b6-4a95-a452-8ec139b92d24)

After:
![Screenshot 2024-03-11 at 4 38 16 PM](https://github.com/flutter/engine/assets/919017/62f6e803-6d2d-464f-a470-86fee898215f)

2024-03-12 19:40:57 +00:00

engine/src/flutter

[Impeller] Fix shader depth assignment & glyph atlas transform. (flutter/engine#51343)

2024-03-12 19:40:57 +00:00

DEPS

Reland "Move emscripten out of the buildroot into the flutter repo" (flutter/engine#51353)

2024-03-12 18:32:08 +00:00

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