Re: Grub2 Graphics In OS

[Andrei Borzenkov]

15.12.2016 22:29, Tristan ross пишет:
>    Hey, I've got my os to boot with grub2 and it goes into graphics mode.

"It" - grub or os?

>    I'm trying to set the rgb color of pixels but I just get blue when I
>    run my function to generate an rgb color.
> 

How is your function related to grub?

>    Code is at [1]https://github.com/SpaceboyRoss01/ronix
> 

There is no single commit message there to understand what you are doing.

>    Â
> 
>    Code to generate color:
> 
>    unsigned int graphics_color(int r,int g,int b) {
>    Â Â Â  unsigned int color = ((r*1000)+(g*100)+(b*10));

This is unreadable and in any case, posting random snippet without
telling where this snippet comes from is useless. Please post in plain
text and explain, where this code comes from and what you are attempting
to do.

>    Â Â Â  switch(graphics_mbi->framebuffer_type) {
>    Â Â Â Â Â Â Â  case MULTIBOOT_FRAMEBUFFER_TYPE_RGB:
>    Â Â Â Â Â Â Â Â Â Â Â  color = ((r <<
>    graphics_mbi->framebuffer_red_mask_size) - r) <<
>    graphics_mbi->framebuffer_red_field_position;
>    Â Â Â Â Â Â Â Â Â Â Â  color += ((g <<
>    graphics_mbi->framebuffer_green_mask_size) - g) <<
>    graphics_mbi->framebuffer_green_field_position;
>    Â Â Â Â Â Â Â Â Â Â Â  color += ((b <<
>    graphics_mbi->framebuffer_blue_mask_size) - b) <<
>    graphics_mbi->framebuffer_blue_field_position;
>    Â Â Â Â Â Â Â Â Â Â Â  break;
>    Â Â Â Â Â Â Â  case MULTIBOOT_FRAMEBUFFER_TYPE_EGA_TEXT:
>    Â Â  Â Â Â Â Â Â Â Â  color = '\\' | ((r*1000)+(g*100)+(b*10));
>    Â Â  Â Â Â Â Â Â Â Â  break;
>    Â Â Â  }
>    Â Â Â  #ifdef DEBUG
>    Â Â Â  debugf("RGB(%d,%d,%d) = %d\n",r,g,b,color);
>    Â Â Â  #endif
>    Â Â Â  return color;
>    }
>    Â
>    I'm running graphics_color(255,255,255) which returns -50200321
>    How do I fix this so it returns 16777215
>    I used the grub2 multiboot documentation.
> 
> References
> 
>    1. https://github.com/SpaceboyRoss01/ronix
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