[libpicofe.git] / linux / fbdev.c

/*
 * (C) Gražvydas "notaz" Ignotas, 2009-2010
 *
 * This work is licensed under the terms of any of these licenses
 * (at your option):
 *  - GNU GPL, version 2 or later.
 *  - GNU LGPL, version 2.1 or later.
 * See the COPYING file in the top-level directory.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <unistd.h>
#include <linux/fb.h>
#include <linux/matroxfb.h>

#include "fbdev.h"

struct vout_fbdev {
	int	fd;
	void	*mem;
	size_t	mem_size;
	struct	fb_var_screeninfo fbvar_old;
	struct	fb_var_screeninfo fbvar_new;
	int	buffer_write;
	int	fb_size;
	int	buffer_count;
	int	top_border, bottom_border;
};

void *vout_fbdev_flip(struct vout_fbdev *fbdev)
{
	int draw_buf;

	if (fbdev->buffer_count < 2)
		return fbdev->mem;

	draw_buf = fbdev->buffer_write;
	fbdev->buffer_write++;
	if (fbdev->buffer_write >= fbdev->buffer_count)
		fbdev->buffer_write = 0;

	fbdev->fbvar_new.yoffset = 
		(fbdev->top_border + fbdev->fbvar_new.yres + fbdev->bottom_border) * draw_buf +
		fbdev->top_border;

	ioctl(fbdev->fd, FBIOPAN_DISPLAY, &fbdev->fbvar_new);

	return (char *)fbdev->mem + fbdev->fb_size * fbdev->buffer_write;
}

void vout_fbdev_wait_vsync(struct vout_fbdev *fbdev)
{
	int arg = 0;
	ioctl(fbdev->fd, FBIO_WAITFORVSYNC, &arg);
}

int vout_fbdev_resize(struct vout_fbdev *fbdev, int w, int h, int bpp,
		      int left_border, int right_border, int top_border, int bottom_border, int buffer_cnt)
{
	int w_total = left_border + w + right_border;
	int h_total = top_border + h + bottom_border;
	size_t mem_size;
	int ret;

	// unblank to be sure the mode is really accepted
	ioctl(fbdev->fd, FBIOBLANK, FB_BLANK_UNBLANK);

	if (fbdev->fbvar_new.bits_per_pixel != bpp ||
			w != fbdev->fbvar_new.xres ||
			h != fbdev->fbvar_new.yres ||
			w_total != fbdev->fbvar_new.xres_virtual ||
			h_total > fbdev->fbvar_new.yres_virtual ||
			left_border != fbdev->fbvar_new.xoffset) {
		fbdev->fbvar_new.xres = w;
		fbdev->fbvar_new.yres = h;
		fbdev->fbvar_new.xres_virtual = w_total;
		fbdev->fbvar_new.yres_virtual = h_total;
		fbdev->fbvar_new.xoffset = left_border;
		fbdev->fbvar_new.bits_per_pixel = bpp;
		printf(" switching to %dx%d@%d\n", w, h, bpp);
		ret = ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_new);
		if (ret == -1) {
			perror("FBIOPUT_VSCREENINFO ioctl");
			return -1;
		}
	}

	fbdev->buffer_count = buffer_cnt;

	if (fbdev->fbvar_new.yres_virtual < h_total * fbdev->buffer_count) {
		fbdev->fbvar_new.yres_virtual = h_total * fbdev->buffer_count;
		ret = ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_new);
		if (ret == -1) {
			fbdev->buffer_count = 1;
			fprintf(stderr, "Warning: failed to increase virtual resolution, "
					"doublebuffering disabled\n");
		}
	}

	fbdev->fb_size = w_total * h_total * bpp / 8;
	fbdev->top_border = top_border;
	fbdev->bottom_border = bottom_border;

	mem_size = fbdev->fb_size * fbdev->buffer_count;
	if (fbdev->mem_size >= mem_size)
		return 0;

	if (fbdev->mem != NULL)
		munmap(fbdev->mem, fbdev->mem_size);

	fbdev->mem = mmap(0, mem_size, PROT_WRITE|PROT_READ, MAP_SHARED, fbdev->fd, 0);
	if (fbdev->mem == MAP_FAILED && fbdev->buffer_count > 1) {
		fprintf(stderr, "Warning: can't map %zd bytes, doublebuffering disabled\n", fbdev->mem_size);
		fbdev->buffer_count = 1;
		mem_size = fbdev->fb_size;
		fbdev->mem = mmap(0, mem_size, PROT_WRITE|PROT_READ, MAP_SHARED, fbdev->fd, 0);
	}
	if (fbdev->mem == MAP_FAILED) {
		fbdev->mem = NULL;
		fbdev->mem_size = 0;
		perror("mmap framebuffer");
		return -1;
	}

	fbdev->mem_size = mem_size;
	return 0;
}

void vout_fbdev_clear(struct vout_fbdev *fbdev)
{
	memset(fbdev->mem, 0, fbdev->mem_size);
}

void vout_fbdev_clear_lines(struct vout_fbdev *fbdev, int y, int count)
{
	int stride = fbdev->fbvar_new.xres_virtual * fbdev->fbvar_new.bits_per_pixel / 8;
	int i;

	if (y + count > fbdev->top_border + fbdev->fbvar_new.yres)
		count = fbdev->top_border + fbdev->fbvar_new.yres - y;

	if (y >= 0 && count > 0)
		for (i = 0; i < fbdev->buffer_count; i++)
			memset((char *)fbdev->mem + fbdev->fb_size * i + y * stride, 0, stride * count);
}

int vout_fbdev_get_fd(struct vout_fbdev *fbdev)
{
	return fbdev->fd;
}

struct vout_fbdev *vout_fbdev_init(const char *fbdev_name, int *w, int *h, int bpp, int buffer_cnt)
{
	struct vout_fbdev *fbdev;
	int req_w, req_h;
	int ret;

	fbdev = calloc(1, sizeof(*fbdev));
	if (fbdev == NULL)
		return NULL;

	fbdev->fd = open(fbdev_name, O_RDWR);
	if (fbdev->fd == -1) {
		fprintf(stderr, "%s: ", fbdev_name);
		perror("open");
		goto fail_open;
	}

	ret = ioctl(fbdev->fd, FBIOGET_VSCREENINFO, &fbdev->fbvar_old);
	if (ret == -1) {
		perror("FBIOGET_VSCREENINFO ioctl");
		goto fail;
	}

	fbdev->fbvar_new = fbdev->fbvar_old;

	req_w = fbdev->fbvar_new.xres;
	if (*w != 0)
		req_w = *w;
	req_h = fbdev->fbvar_new.yres;
	if (*h != 0)
		req_h = *h;

	ret = vout_fbdev_resize(fbdev, req_w, req_h, bpp, 0, 0, 0, 0, buffer_cnt);
	if (ret != 0)
		goto fail;

	printf("%s: %ix%i@%d\n", fbdev_name, fbdev->fbvar_new.xres, fbdev->fbvar_new.yres,
		fbdev->fbvar_new.bits_per_pixel);
	*w = fbdev->fbvar_new.xres;
	*h = fbdev->fbvar_new.yres;

	memset(fbdev->mem, 0, fbdev->mem_size);

	// some checks
	ret = 0;
	ret = ioctl(fbdev->fd, FBIO_WAITFORVSYNC, &ret);
	if (ret != 0)
		fprintf(stderr, "Warning: vsync doesn't seem to be supported\n");

	if (fbdev->buffer_count > 1) {
		fbdev->buffer_write = 0;
		fbdev->fbvar_new.yoffset = fbdev->fbvar_new.yres * (fbdev->buffer_count - 1);
		ret = ioctl(fbdev->fd, FBIOPAN_DISPLAY, &fbdev->fbvar_new);
		if (ret != 0) {
			fbdev->buffer_count = 1;
			fprintf(stderr, "Warning: can't pan display, doublebuffering disabled\n");
		}
	}

	printf("fbdev initialized.\n");
	return fbdev;

fail:
	close(fbdev->fd);
fail_open:
	free(fbdev);
	return NULL;
}

void vout_fbdev_finish(struct vout_fbdev *fbdev)
{
	ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_old);
	if (fbdev->mem != MAP_FAILED)
		munmap(fbdev->mem, fbdev->mem_size);
	if (fbdev->fd >= 0)
		close(fbdev->fd);
	fbdev->mem = NULL;
	fbdev->fd = -1;
	free(fbdev);
}
Commit	Line	Data
392b07b2	1	/*
	2	* (C) Gražvydas "notaz" Ignotas, 2009-2010
	3	*
957a9eac	4	* This work is licensed under the terms of any of these licenses
	5	* (at your option):
	6	* - GNU GPL, version 2 or later.
	7	* - GNU LGPL, version 2.1 or later.
392b07b2	8	* See the COPYING file in the top-level directory.
	9	*/
	10
b188c2b6	11	#include <stdio.h>
1f8b4b84	12	#include <stdlib.h>
b188c2b6	13	#include <string.h>
	14	#include <sys/types.h>
	15	#include <sys/stat.h>
	16	#include <fcntl.h>
	17	#include <sys/ioctl.h>
	18	#include <sys/mman.h>
	19	#include <unistd.h>
	20	#include <linux/fb.h>
	21	#include <linux/matroxfb.h>
	22
b188c2b6	23	#include "fbdev.h"
b188c2b6	24
1f8b4b84	25	struct vout_fbdev {
	26	int fd;
	27	void *mem;
	28	size_t mem_size;
	29	struct fb_var_screeninfo fbvar_old;
	30	struct fb_var_screeninfo fbvar_new;
	31	int buffer_write;
b6b7d1b1	32	int fb_size;
1f8b4b84	33	int buffer_count;
b6b7d1b1	34	int top_border, bottom_border;
1f8b4b84	35	};
	36
	37	void vout_fbdev_flip(struct vout_fbdev fbdev)
b188c2b6	38	{
	39	int draw_buf;
	40
1f8b4b84	41	if (fbdev->buffer_count < 2)
1f8b4b84	42	return fbdev->mem;
b188c2b6	43
1f8b4b84	44	draw_buf = fbdev->buffer_write;
	45	fbdev->buffer_write++;
	46	if (fbdev->buffer_write >= fbdev->buffer_count)
	47	fbdev->buffer_write = 0;
b188c2b6	48
b6b7d1b1	49	fbdev->fbvar_new.yoffset =
	50	(fbdev->top_border + fbdev->fbvar_new.yres + fbdev->bottom_border) * draw_buf +
	51	fbdev->top_border;
d5d59eb4	52
1f8b4b84	53	ioctl(fbdev->fd, FBIOPAN_DISPLAY, &fbdev->fbvar_new);
1f8b4b84	54
b6b7d1b1	55	return (char )fbdev->mem + fbdev->fb_size fbdev->buffer_write;
b188c2b6	56	}
b188c2b6	57
1f8b4b84	58	void vout_fbdev_wait_vsync(struct vout_fbdev *fbdev)
b188c2b6	59	{
b188c2b6	60	int arg = 0;
1f8b4b84	61	ioctl(fbdev->fd, FBIO_WAITFORVSYNC, &arg);
b188c2b6	62	}
b188c2b6	63
4332e4bc	64	int vout_fbdev_resize(struct vout_fbdev *fbdev, int w, int h, int bpp,
4332e4bc	65	int left_border, int right_border, int top_border, int bottom_border, int buffer_cnt)
b6b7d1b1	66	{
	67	int w_total = left_border + w + right_border;
	68	int h_total = top_border + h + bottom_border;
	69	size_t mem_size;
	70	int ret;
	71
	72	// unblank to be sure the mode is really accepted
	73	ioctl(fbdev->fd, FBIOBLANK, FB_BLANK_UNBLANK);
	74
4332e4bc	75	if (fbdev->fbvar_new.bits_per_pixel != bpp \|\|
b6b7d1b1	76	w != fbdev->fbvar_new.xres \|\|
	77	h != fbdev->fbvar_new.yres \|\|
	78	w_total != fbdev->fbvar_new.xres_virtual \|\|
	79	h_total > fbdev->fbvar_new.yres_virtual \|\|
	80	left_border != fbdev->fbvar_new.xoffset) {
	81	fbdev->fbvar_new.xres = w;
	82	fbdev->fbvar_new.yres = h;
	83	fbdev->fbvar_new.xres_virtual = w_total;
	84	fbdev->fbvar_new.yres_virtual = h_total;
	85	fbdev->fbvar_new.xoffset = left_border;
4332e4bc	86	fbdev->fbvar_new.bits_per_pixel = bpp;
4332e4bc	87	printf(" switching to %dx%d@%d\n", w, h, bpp);
b6b7d1b1	88	ret = ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_new);
	89	if (ret == -1) {
	90	perror("FBIOPUT_VSCREENINFO ioctl");
	91	return -1;
	92	}
	93	}
	94
4332e4bc	95	fbdev->buffer_count = buffer_cnt;
b6b7d1b1	96
	97	if (fbdev->fbvar_new.yres_virtual < h_total * fbdev->buffer_count) {
	98	fbdev->fbvar_new.yres_virtual = h_total * fbdev->buffer_count;
	99	ret = ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_new);
	100	if (ret == -1) {
	101	fbdev->buffer_count = 1;
	102	fprintf(stderr, "Warning: failed to increase virtual resolution, "
	103	"doublebuffering disabled\n");
	104	}
	105	}
	106
4332e4bc	107	fbdev->fb_size = w_total * h_total * bpp / 8;
b6b7d1b1	108	fbdev->top_border = top_border;
	109	fbdev->bottom_border = bottom_border;
	110
	111	mem_size = fbdev->fb_size * fbdev->buffer_count;
	112	if (fbdev->mem_size >= mem_size)
	113	return 0;
	114
	115	if (fbdev->mem != NULL)
	116	munmap(fbdev->mem, fbdev->mem_size);
	117
	118	fbdev->mem = mmap(0, mem_size, PROT_WRITE\|PROT_READ, MAP_SHARED, fbdev->fd, 0);
	119	if (fbdev->mem == MAP_FAILED && fbdev->buffer_count > 1) {
	120	fprintf(stderr, "Warning: can't map %zd bytes, doublebuffering disabled\n", fbdev->mem_size);
	121	fbdev->buffer_count = 1;
	122	mem_size = fbdev->fb_size;
	123	fbdev->mem = mmap(0, mem_size, PROT_WRITE\|PROT_READ, MAP_SHARED, fbdev->fd, 0);
	124	}
	125	if (fbdev->mem == MAP_FAILED) {
	126	fbdev->mem = NULL;
	127	fbdev->mem_size = 0;
	128	perror("mmap framebuffer");
	129	return -1;
	130	}
	131
	132	fbdev->mem_size = mem_size;
	133	return 0;
	134	}
	135
1f8b4b84	136	void vout_fbdev_clear(struct vout_fbdev *fbdev)
b188c2b6	137	{
1f8b4b84	138	memset(fbdev->mem, 0, fbdev->mem_size);
	139	}
	140
b6b7d1b1	141	void vout_fbdev_clear_lines(struct vout_fbdev *fbdev, int y, int count)
b6b7d1b1	142	{
6bc3d94d	143	int stride = fbdev->fbvar_new.xres_virtual * fbdev->fbvar_new.bits_per_pixel / 8;
b6b7d1b1	144	int i;
b6b7d1b1	145
6bc3d94d	146	if (y + count > fbdev->top_border + fbdev->fbvar_new.yres)
6bc3d94d	147	count = fbdev->top_border + fbdev->fbvar_new.yres - y;
b6b7d1b1	148
	149	if (y >= 0 && count > 0)
	150	for (i = 0; i < fbdev->buffer_count; i++)
	151	memset((char )fbdev->mem + fbdev->fb_size i + y * stride, 0, stride * count);
	152	}
	153
	154	int vout_fbdev_get_fd(struct vout_fbdev *fbdev)
	155	{
	156	return fbdev->fd;
	157	}
	158
4332e4bc	159	struct vout_fbdev vout_fbdev_init(const char fbdev_name, int w, int h, int bpp, int buffer_cnt)
1f8b4b84	160	{
1f8b4b84	161	struct vout_fbdev *fbdev;
b6b7d1b1	162	int req_w, req_h;
b6b7d1b1	163	int ret;
b188c2b6	164
1f8b4b84	165	fbdev = calloc(1, sizeof(*fbdev));
	166	if (fbdev == NULL)
	167	return NULL;
	168
	169	fbdev->fd = open(fbdev_name, O_RDWR);
	170	if (fbdev->fd == -1) {
b188c2b6	171	fprintf(stderr, "%s: ", fbdev_name);
b188c2b6	172	perror("open");
1f8b4b84	173	goto fail_open;
b188c2b6	174	}
b188c2b6	175
1f8b4b84	176	ret = ioctl(fbdev->fd, FBIOGET_VSCREENINFO, &fbdev->fbvar_old);
b188c2b6	177	if (ret == -1) {
	178	perror("FBIOGET_VSCREENINFO ioctl");
	179	goto fail;
	180	}
	181
1f8b4b84	182	fbdev->fbvar_new = fbdev->fbvar_old;
b188c2b6	183
b6b7d1b1	184	req_w = fbdev->fbvar_new.xres;
	185	if (*w != 0)
	186	req_w = *w;
	187	req_h = fbdev->fbvar_new.yres;
	188	if (*h != 0)
	189	req_h = *h;
b188c2b6	190
4332e4bc	191	ret = vout_fbdev_resize(fbdev, req_w, req_h, bpp, 0, 0, 0, 0, buffer_cnt);
b6b7d1b1	192	if (ret != 0)
b188c2b6	193	goto fail;
b6b7d1b1	194
	195	printf("%s: %ix%i@%d\n", fbdev_name, fbdev->fbvar_new.xres, fbdev->fbvar_new.yres,
	196	fbdev->fbvar_new.bits_per_pixel);
	197	*w = fbdev->fbvar_new.xres;
	198	*h = fbdev->fbvar_new.yres;
	199
1f8b4b84	200	memset(fbdev->mem, 0, fbdev->mem_size);
b188c2b6	201
	202	// some checks
	203	ret = 0;
1f8b4b84	204	ret = ioctl(fbdev->fd, FBIO_WAITFORVSYNC, &ret);
b188c2b6	205	if (ret != 0)
	206	fprintf(stderr, "Warning: vsync doesn't seem to be supported\n");
	207
1f8b4b84	208	if (fbdev->buffer_count > 1) {
1f8b4b84	209	fbdev->buffer_write = 0;
b6b7d1b1	210	fbdev->fbvar_new.yoffset = fbdev->fbvar_new.yres * (fbdev->buffer_count - 1);
1f8b4b84	211	ret = ioctl(fbdev->fd, FBIOPAN_DISPLAY, &fbdev->fbvar_new);
b188c2b6	212	if (ret != 0) {
1f8b4b84	213	fbdev->buffer_count = 1;
b188c2b6	214	fprintf(stderr, "Warning: can't pan display, doublebuffering disabled\n");
	215	}
	216	}
	217
	218	printf("fbdev initialized.\n");
1f8b4b84	219	return fbdev;
b188c2b6	220
b188c2b6	221	fail:
1f8b4b84	222	close(fbdev->fd);
	223	fail_open:
	224	free(fbdev);
	225	return NULL;
b188c2b6	226	}
b188c2b6	227
1f8b4b84	228	void vout_fbdev_finish(struct vout_fbdev *fbdev)
b188c2b6	229	{
1f8b4b84	230	ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_old);
	231	if (fbdev->mem != MAP_FAILED)
	232	munmap(fbdev->mem, fbdev->mem_size);
	233	if (fbdev->fd >= 0)
	234	close(fbdev->fd);
	235	fbdev->mem = NULL;
	236	fbdev->fd = -1;
	237	free(fbdev);
b188c2b6	238	}
b188c2b6	239