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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;
// Map buffer to the end of the memory
// indeed fb_cfg.location could be to big and
// thus leading to cross u64 size limit while summing it with
// kvar_kernel_vma in paging.cc/hpp
u64 start=0xFFFFFFFFFFFFFFFF - (fb_cfg.pitch*fb_cfg.height);
// Ensure we start writing at the begining of the page since
// start is not necessarly 4096 bytes aligned
start=PAGE(start);
PAGE_RMAP(start,fb_cfg.location, PAGING_OPT_DEFAULTS,fb_cfg.pitch*fb_cfg.height);
fb_cfg.location=start;
}
void framebuffer_draw(FB_PIXEL p){
// Check overflow
p.x=p.x>(fb_cfg.width)?fb_cfg.width:p.x;
p.y=p.y>(fb_cfg.width)?fb_cfg.width:p.y;
p.x=p.x<0?0:p.x;
p.y=p.y<0?0:p.y;
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){
for(u32 y=0;y<fb_cfg.height;y++){
if(npixel<fb_cfg.height){
for(u32 x=0;x<fb_cfg.width;x++){
u32 *pixel_dst=(u32*)(fb_cfg.location+x*(fb_cfg.depth/8)+y*fb_cfg.pitch);
u32 *pixel_src=(u32*)(fb_cfg.location+x*(fb_cfg.depth/8)+npixel*fb_cfg.pitch);
*pixel_dst=*pixel_src; // Faster than writing pixel by pixel
}
}
else{
for(u32 x=0;x<fb_cfg.width;x++){
u8 *pixel_dst=(u8*)(fb_cfg.location+x*(fb_cfg.depth/8)+y*fb_cfg.pitch);
*pixel_dst=0;// Faster than writing pixel by pixel
}
}
npixel++;
}
}
void framebuffer_clear(){
// memset((void*)fb_cfg.location, 0, fb_cfg.pitch*fb_cfg.height-1000);
}
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