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