On 11/1/24 20:16, Alex Bennée wrote: > Also what is the subtlety behind using both stride and bytes_pp in the > calculation. My naive thought would be: > > fb.bytes_pp * ss.r.width == fb.stride > > Can anyone enlighten me?
GPUs want image line size to be aligned to a power of 2 value, like 64 bytes for example. This aligned size of the line is called stride. GPU's DMA engine operates with a predefined granularity when it accesses memory, it reads/writes memory chunks that are multiple of a stride. GPUs almost never support memory accesses at a granularity of one byte, like CPUs do it. -- Best regards, Dmitry
