kc3-lang/angle

2020-09-13T20:14:59

Metal: Implement Uniform buffers Uniform buffer is implemented in two forms: - If number of ubo used in shader program is low, each buffer will use one discrete Metal buffer slot. - If number of ubo used is large, they will be embedded into one Metal argument buffer. Argument buffer is similar to Vulkan descriptor set. This is due to limit of number of Metal's discrete buffer slots which is only 31 and over half of them are already used by vertex attributes, default uniforms, driver uniforms, etc. The downside is that whenever a buffer binding is changed, the argument buffer must be updated also. Added empty TransformFeedbackMtl implementation to enable ES3 context creation on Metal. Bug: angleproject:2634 Change-Id: I69325696fac735cb45ab88ab55468c0991abc317 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2408593 Commit-Queue: Le Hoang Quyen <le.hoang.q@gmail.com> Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Jonah Ryan-Davis <jonahr@google.com>