forked from Bananymous/banan-os
46 lines
1.1 KiB
C++
46 lines
1.1 KiB
C++
#include "Framebuffer.h"
|
|
|
|
#include <fcntl.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <sys/framebuffer.h>
|
|
#include <sys/mman.h>
|
|
|
|
Framebuffer open_framebuffer()
|
|
{
|
|
int framebuffer_fd = open("/dev/fb0", O_RDWR | O_CLOEXEC);
|
|
if (framebuffer_fd == -1)
|
|
{
|
|
perror("open");
|
|
exit(1);
|
|
}
|
|
|
|
framebuffer_info_t framebuffer_info;
|
|
if (pread(framebuffer_fd, &framebuffer_info, sizeof(framebuffer_info), -1) == -1)
|
|
{
|
|
perror("pread");
|
|
exit(1);
|
|
}
|
|
|
|
const size_t framebuffer_bytes = framebuffer_info.width * framebuffer_info.height * (BANAN_FB_BPP / 8);
|
|
|
|
uint32_t* framebuffer_mmap = (uint32_t*)mmap(NULL, framebuffer_bytes, PROT_READ | PROT_WRITE, MAP_SHARED, framebuffer_fd, 0);
|
|
if (framebuffer_mmap == MAP_FAILED)
|
|
{
|
|
perror("mmap");
|
|
exit(1);
|
|
}
|
|
|
|
memset(framebuffer_mmap, 0, framebuffer_bytes);
|
|
msync(framebuffer_mmap, framebuffer_bytes, MS_SYNC);
|
|
|
|
Framebuffer framebuffer;
|
|
framebuffer.fd = framebuffer_fd;
|
|
framebuffer.mmap = framebuffer_mmap;
|
|
framebuffer.width = framebuffer_info.width;
|
|
framebuffer.height = framebuffer_info.height;
|
|
framebuffer.bpp = BANAN_FB_BPP;
|
|
return framebuffer;
|
|
}
|