Hi Qiang Wang,
The screen resolution should be set in your EGL code. If you like to get two outpout fb with the same context, you have to use multiple-buffer rendering, set the environment variable FB_MULTI_BUFFER to an unsigned integer value, which indicates the number of buffers required. Recommended values: 2 or 3 The FB_MULTI_BUFFER variable can be set to any positive integer value.
If set to 1, the multiple buffer function is not enabled.
If set to 2 or 3, the driver will run as users expect.
If set to a value more than 3, the driver will use 3 as the buffer count.
To create a window with its size different from the display size, use the environment variable FB_IGNORE_DISPLAY_SIZE. Example usage syntax: export FB_IGNORE_DISPLAY_SIZE=1 To let the driver use multiple buffers to do swap work, use the environment variable FB_MULTI_BUFFER. Example usage syntax: export FB_MULTI_BUFFER=2
To specify the display device, use the environment variable FB_FRAMEBUFFER_n, where n = any positive integer. Example usage syntax: export FB_FRAMEBUFFER_0=/dev/fb0 export FB_FRAMEBUFFER_1=/dev/fb1 export FB_FRAMEBUFFER_2=/dev/fb2 export FB_FRAMEBUFFER_3=/dev/fb3
Hope this helps
