src/drivers/framebuffer.cc


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#include "framebuffer.hpp"
#include "core/paging.hpp"
#include "libs/string.hpp"

FB_CFG fb_cfg;


void framebuffer_init(FB_CFG config){
    fb_cfg=config;
    PAGING_MAP_RANGE(fb_cfg.location, fb_cfg.pitch*fb_cfg.height);
}

void framebuffer_draw(FB_PIXEL p){
    u8 *pixel=(u8*)(fb_cfg.location+p.x*(fb_cfg.depth/8)+p.y*fb_cfg.pitch);
    pixel[0]=p.r;
    pixel[1]=p.g;
    pixel[2]=p.b;
    if(fb_cfg.depth==32)
        pixel[3]=p.a;
}

void framebuffer_scrollup(u32 npixel){
    u64 start=fb_cfg.location+npixel*fb_cfg.pitch;
    u64 amount=fb_cfg.pitch*(fb_cfg.height-npixel);
    memcpy((void*)start,(void*)fb_cfg.location,amount); // TODO change because page fault can occurs
}

void framebuffer_clear(){
    memset((void*)fb_cfg.location, 0, fb_cfg.pitch*fb_cfg.height);
}