Old chatcam

The size of the framebuffer memory block is given by: The number of bytes per pixel sets the number of colours available.The Raspberry-Pi GPU supports 8-bit, but in this mode the 8-bit value corresponds to a palette entry, and the palette appears to be very limited A palette mode can be really useful as it’s fast (minimal amount of memory required for the graphics) and can be really useful for some special effects by simply altering the palette.Some material that’s useful (Generally for late night reading!): The GPU and ARM devices can communicate with each other through a mailbox system.This mailbox is responsible for negotiating the framebuffer.We need some code to be able to read and write data from the mailbox and we also need to define the data structure defined by the framebuffer mailbox documentation.The ARM014 tutorial introduces a few new peices of the puzzle.

It’s implemented in the file that we require on the SD Card to boot the Raspberry-Pi.However, don’t forget that the ARM and GPU also share the memory space, and so although we have to communicate through the mailbox, this is what negotiates settings and a framebuffer.The framebuffer address in memory is then returned from the GPU and we can go ahead and write to the framebuffer to see graphics.A framebuffer is a term that really refers to a block of video memory.This video memory is used to display pixels on the screen.

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