[bug] Double buffering support not working #29

New issue

Open

opened 2024-03-12 14:35:29 +01:00 by hgruniaux · 0 comments

hgruniaux commented

2024-03-12 14:35:29 +01:00

(Migrated from github.com)

Actually, double buffering should already be supported in my branch. BUT, it is not. The code is not working.

The idea, is to allocate a framebuffer twice the height of the requested size. And then use the SET_VIRTUAL_OFFSET tag (in mailbox) to change the "view" of the VideoCore into the framebuffer to implement the double buffering. However, tests show that do not work on QEMU.

The concept is exactly the one explained everywhere on forums. So, it should work. There is probably a problem in my code, or worse, QEMU may not support that. To be tested... on hardware.

Actually, double buffering should already be supported in my branch. BUT, it is not. The code is not working. The idea, is to allocate a framebuffer twice the height of the requested size. And then use the SET_VIRTUAL_OFFSET tag (in mailbox) to change the "view" of the VideoCore into the framebuffer to implement the double buffering. However, tests show that do not work on QEMU. The concept is exactly the one explained everywhere on forums. So, it should work. There is probably a problem in my code, or worse, QEMU may not support that. To be tested... on hardware.