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/*
winnie - an experimental window system
Copyright (C) 2013 Eleni Maria Stea
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
Author: Eleni Maria Stea <elene.mst@gmail.com>
*/
#ifdef WINNIE_FBDEV
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/time.h>
#include <unistd.h>
#include <linux/fb.h>
#include "gfx.h"
#include "shalloc.h"
#include "winnie.h"
#define FRAMEBUFFER_SIZE(xsz, ysz, bpp) ((xsz) * (ysz) * (bpp) / CHAR_BIT)
static unsigned char *framebuffer;
static int dev_fd;
static int rgb_order[3];
struct Graphics {
Rect screen_rect;
Rect clipping_rect;
int color_depth;
Pixmap *pixmap;
};
static Graphics *gfx;
bool init_gfx()
{
if(!(gfx = (Graphics*)sh_malloc(sizeof *gfx))) {
return false;
}
get_subsys()->graphics_offset = (int)((char*)gfx - (char*)get_pool());
dev_fd = -1;
if((dev_fd = open("/dev/fb0", O_RDWR)) == -1) {
fprintf(stderr, "Cannot open /dev/fb0 : %s\n", strerror(errno));
return false;
}
fb_var_screeninfo sinfo;
if(ioctl(dev_fd, FBIOGET_VSCREENINFO, &sinfo) == -1) {
close(dev_fd);
dev_fd = -1;
fprintf(stderr, "Unable to get screen info : %s\n", strerror(errno));
return false;
}
printf("width : %d height : %d\n : bpp : %d\n", sinfo.xres, sinfo.yres, sinfo.bits_per_pixel);
printf("virtual w: %d virtual h: %d\n", sinfo.xres_virtual, sinfo.yres_virtual);
gfx->screen_rect.x = gfx->screen_rect.y = 0;
gfx->screen_rect.width = sinfo.xres_virtual;
gfx->screen_rect.height = sinfo.yres_virtual;
gfx->color_depth = sinfo.bits_per_pixel;
rgb_order[0] = sinfo.red.offset / 8;
rgb_order[1] = sinfo.green.offset / 8;
rgb_order[2] = sinfo.blue.offset / 8;
set_clipping_rect(gfx->screen_rect);
int sz = FRAMEBUFFER_SIZE(gfx->screen_rect.width, gfx->screen_rect.height, gfx->color_depth);
framebuffer = (unsigned char*)mmap(0, sz, PROT_READ | PROT_WRITE, MAP_SHARED, dev_fd, 0);
if(framebuffer == (void*)-1) {
close(dev_fd);
dev_fd = -1;
fprintf(stderr, "Cannot map the framebuffer to memory : %s\n", strerror(errno));
return false;
}
// TODO: uncomment when I find how to use intelfb instead of i915 GRRRR.-
fb_vblank vblank;
if(ioctl(dev_fd, FBIOGET_VBLANK, &vblank) == -1) {
// fprintf(stderr, "FBIOGET_VBLANK error: %s\n", strerror(errno));
}
/*
else {
printf("flags: %x\n", vblank.flags);
printf("count: %d\n", vblank.count);
printf("beam position: %d, %d\n", vblank.hcount, vblank.vcount);
}
*/
if(!(gfx->pixmap = (Pixmap*)sh_malloc(sizeof(Pixmap)))) {
fprintf(stderr, "Failed to allocate pixmap.\n");
return false;
}
gfx->pixmap->width = gfx->screen_rect.width;
gfx->pixmap->height = gfx->screen_rect.height;
int fbsize = gfx->pixmap->width * gfx->pixmap->height * gfx->color_depth / 8;
if(!(gfx->pixmap->pixels = (unsigned char*)sh_malloc(fbsize))) {
fprintf(stderr, "failed to allocate the pixmap framebuffer.\n");
return false;
}
return true;
}
void destroy_gfx()
{
clear_screen(0, 0, 0);
gfx_update(gfx->screen_rect);
if(dev_fd != -1) {
close(dev_fd);
}
dev_fd = -1;
munmap(framebuffer, FRAMEBUFFER_SIZE(gfx->screen_rect.width, gfx->screen_rect.height, gfx->color_depth));
framebuffer = 0;
sh_free(gfx->pixmap->pixels);
gfx->pixmap->pixels = 0;
sh_free(gfx->pixmap);
sh_free(gfx);
}
bool client_open_gfx(void *smem_start, int offset)
{
gfx = (Graphics*)((unsigned char*)smem_start + offset);
return true;
}
void client_close_gfx()
{
}
unsigned char *get_framebuffer()
{
return gfx->pixmap->pixels;
}
Pixmap *get_framebuffer_pixmap()
{
return gfx->pixmap;
}
Rect get_screen_size()
{
return gfx->screen_rect;
}
int get_color_depth()
{
return gfx->color_depth;
}
void set_clipping_rect(const Rect &rect)
{
gfx->clipping_rect = rect_intersection(rect, get_screen_size());
}
const Rect &get_clipping_rect()
{
return gfx->clipping_rect;
}
void set_cursor_visibility(bool visible)
{
fb_cursor curs;
curs.enable = visible ? 1 : 0;
if(ioctl(dev_fd, FBIO_CURSOR, &curs) == -1) {
fprintf(stderr, "Cannot toggle cursor visibility : %s\n", strerror(errno));
}
}
void gfx_update(const Rect &upd_rect)
{
Rect rect = rect_intersection(upd_rect, gfx->screen_rect);
unsigned char *sptr = gfx->pixmap->pixels + (rect.y * gfx->screen_rect.width + rect.x) * 4;
unsigned char *dptr = framebuffer + (rect.y * gfx->screen_rect.width + rect.x) * 4;
for(int i=0; i<rect.height; i++) {
memcpy(dptr, sptr, rect.width * 4);
sptr += gfx->screen_rect.width * 4;
dptr += gfx->screen_rect.width * 4;
}
}
void wait_vsync()
{
unsigned long arg = 0;
if(ioctl(dev_fd, FBIO_WAITFORVSYNC, &arg) == -1) {
// printf("ioctl error %s\n", strerror(errno));
}
}
void get_rgb_order(int *r, int *g, int *b)
{
*r = rgb_order[0];
*g = rgb_order[1];
*b = rgb_order[2];
}
#endif // WINNIE_FBDEV
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