ObjC: Split out I420 texture uploading into separate class

This CL splits out the code in RTCI420Shader.mm for uploading byte
buffers to textures into its own class RTCI420TextureCache. The purpose
is to prepare for allowing clients to inject their own shaders.
RTCI420TextureCache will be used in the generic code, while the actual
shaders in RTCI420Shader will be customizable by the client.

BUG=webrtc:7473

Review-Url: https://codereview.webrtc.org/2842453002
Cr-Commit-Position: refs/heads/master@{#17882}
5 files changed
tree: 2ef0eee893c86963644638a1e75d751226dc2d3c
  1. build_overrides/
  2. data/
  3. infra/
  4. resources/
  5. tools-webrtc/
  6. webrtc/
  7. .clang-format
  8. .git-blame-ignore-revs
  9. .gitignore
  10. .gn
  11. AUTHORS
  12. BUILD.gn
  13. check_root_dir.py
  14. cleanup_links.py
  15. codereview.settings
  16. DEPS
  17. LICENSE
  18. license_template.txt
  19. LICENSE_THIRD_PARTY
  20. OWNERS
  21. PATENTS
  22. PRESUBMIT.py
  23. pylintrc
  24. README.md
  25. WATCHLISTS
README.md

WebRTC is a free, open software project that provides browsers and mobile applications with Real-Time Communications (RTC) capabilities via simple APIs. The WebRTC components have been optimized to best serve this purpose.

Our mission: To enable rich, high-quality RTC applications to be developed for the browser, mobile platforms, and IoT devices, and allow them all to communicate via a common set of protocols.

The WebRTC initiative is a project supported by Google, Mozilla and Opera, amongst others.

Development

See http://www.webrtc.org/native-code/development for instructions on how to get started developing with the native code.

More info