Re: Grub2 Graphics In OS

[Andrei Borzenkov]

16.12.2016 07:02, Tristan ross пишет:
> 
> I use GRUB2 to boot up and set graphical mode. The function reads the 
> multiboot 
> headers and uses it to render.

Please post you code in plain text without any extra characters so it is
readable. Or post direct link to your code.

> 7:45 PM, December 15, 2016, Andrei Borzenkov <address@hidden>:
> 
>     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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> 
> 
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