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#ifndef __FBGL_H__
#define __FBGL_H__
#define VERSION "0.1.0"
#define NAME "FBGL"
#define DEFAULT_FB "/dev/fb0"
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <unistd.h>
#include <linux/fb.h>
#include <stddef.h>
#include <stdio.h>
/**
* Structs
*/
typedef struct fbgl {
int width;
int height;
int fd;
size_t screen_size;
uint32_t *pixels;
struct fb_var_screeninfo vinfo; // Variable screen information
struct fb_fix_screeninfo finfo; // Fixed screen information
} fbgl_t;
#ifdef __cplusplus
extern "C" {
#endif
/**
* General purpose methods
*/
char const *fbgl_name_info(void);
char const *fbgl_version_info(void);
/*Create and destroy methods*/
int fbgl_init(const char *device, fbgl_t *fb);
void fbgl_destroy(fbgl_t *fb);
/**
* Drawing functions
*/
void fbgl_clear(uint32_t color);
void fbgl_put_pixel(int x, int y, uint32_t color);
void fbgl_draw_line(int x0, int y0, int x1, int y1, uint32_t color);
void fbgl_set_bg();
/**
* Display methods
*/
void fbgl_display();
/**
* Access framebuffer data methods
*/
uint32_t *fb_get_data(void);
int fb_get_width(void);
int fb_get_height(void);
#ifdef FBGL_IMPLEMENTATION
char const *fbgl_name_info(void)
{
return NAME;
}
char const *fbgl_version_info(void)
{
return VERSION;
}
int fbgl_init(const char *device, fbgl_t *fb)
{
if (!fb) {
fprintf(stderr, "Error: fbgl_t pointer is NULL.");
return -1;
}
fb->fd = device == NULL ? open(DEFAULT_FB, O_RDWR) :
open(device, O_RDWR);
if (fb->fd == -1) {
perror("Error openning framebuffer device");
return -1;
}
if (ioctl(fb->fd, FBIOGET_FSCREENINFO, &fb->finfo) == -1) {
perror("Error: Reading fixed information."); close(fb->fd);
return -1;
}
if (ioctl(fb->fd, FBIOGET_VSCREENINFO, &fb->vinfo) == -1) {
perror("Error reading variable information");
close(fb->fd);
return -1;
}
fb->width = fb->vinfo.xres;
fb->height = fb->vinfo.yres;
fb->screen_size = fb->finfo.smem_len;
// Map framebuffer to memory
fb->pixels = (uint32_t *)mmap(NULL, fb->screen_size,
PROT_READ | PROT_WRITE, MAP_SHARED,
fb->fd, 0);
if (fb->pixels == MAP_FAILED) {
perror("Error mapping framebuffer device to memory");
close(fb->fd);
return -1;
}
return 0;
}
void fbgl_destroy(fbgl_t *fb)
{
if (!fb || fb->fd == -1) {
fprintf(stderr,
"Error: framebuffer not initialized or already destroyed.\n");
return;
}
if (fb->pixels && fb->pixels != MAP_FAILED) {
munmap(fb->pixels, fb->screen_size);
}
close(fb->fd);
fb->fd = -1;
}
void fbgl_set_bg(fbgl_t *fb, uint32_t color)
{
if (!fb || fb->fd == -1) {
fprintf(stderr, "Error: framebuffer not initialized.\n");
return;
}
// Fill the entire framebuffer with the specified color
for (size_t i = 0; i < (fb->width * fb->height); ++i) {
fb->pixels[i] = color;
}
}
#endif
#ifdef __cplusplus
} // extern "C"
#endif
#endif // __FBGL_H__
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