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227db66e4f
tl;dr: This PR speedups dolphin on mobiles with the Mali GPU and ES 3.2 drivers by a factor of 10 by using the method with the biggest overhead. Please keep care not to buy this shit! The ARM driver team seems to care very well about their customers. But bad luck, users and open source developers are *not* their customers. So even device-independent feature requests are just ignored for *years*: https://community.arm.com/graphics/f/discussions/4645/gl_ext_buffer_storage-support The bad point, they neither implement any of the other common ways to stream dynamic content in unextented GL: - They just ignore the GL_MAP_UNSYNCHRONIZED_BIT flag - They don't support on-device buffer updates and just stall with glBufferSubData It seems like no benchmark is using any dynamic content - and like no customer cares about anything but benchmarks, or users... We have a flag to disable the glBufferSubData way, this PR adds the flag to also disable the unsychronized mapping way. The second one is available since their ES 3.2 update, but slow as hell. So how to continue? The last remaining technical way to stream dynamic content at all is to alloc a new buffer per draw call with glBufferData. This is very gross, but still a factor 10 speedup compared to stalling the GPU. Small tests shows that you can expect another 3-5 times speedup with EXT_buffer_data, so Mali would be on pair with Adreno here. So if you have bought such a device unfortunately, please try to make noise on your vendor forums/support and ask for this extension. If you are going to buy a new mobile, I'd recormend to avoid *any* mobile with a Mali GPU in it. |
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