[pcsx_rearmed.git] / frontend / 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);
}

/* it is recommended to call vout_fbdev_clear() before this */
void *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.yoffset = top_border;
		fbdev->fbvar_new.bits_per_pixel = bpp;
		printf(" switching to %dx%d@%d\n", w, h, bpp);

		// seems to help a bit to avoid glitches
		vout_fbdev_wait_vsync(fbdev);

		ret = ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_new);
		if (ret == -1) {
			perror("FBIOPUT_VSCREENINFO ioctl");
			return NULL;
		}

		fbdev->buffer_write = 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;
			fbdev->buffer_write = 0;
			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)
		goto out;

	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", mem_size);
		fbdev->buffer_count = 1;
		fbdev->buffer_write = 0;
		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 NULL;
	}

	fbdev->mem_size = mem_size;

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

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;
	void *pret;
	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;

	pret = vout_fbdev_resize(fbdev, req_w, req_h, bpp, 0, 0, 0, 0, buffer_cnt);
	if (pret == NULL)
		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
	1	/*
	2	* (C) Gražvydas "notaz" Ignotas, 2009-2010
	3	*
	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.
	8	* See the COPYING file in the top-level directory.
	9	*/
	10
	11	#include <stdio.h>
	12	#include <stdlib.h>
	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
	23	#include "fbdev.h"
	24
	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;
	32	int fb_size;
	33	int buffer_count;
	34	int top_border, bottom_border;
	35	};
	36
	37	void vout_fbdev_flip(struct vout_fbdev fbdev)
	38	{
	39	int draw_buf;
	40
	41	if (fbdev->buffer_count < 2)
	42	return fbdev->mem;
	43
	44	draw_buf = fbdev->buffer_write;
	45	fbdev->buffer_write++;
	46	if (fbdev->buffer_write >= fbdev->buffer_count)
	47	fbdev->buffer_write = 0;
	48
	49	fbdev->fbvar_new.yoffset =
	50	(fbdev->top_border + fbdev->fbvar_new.yres + fbdev->bottom_border) * draw_buf +
	51	fbdev->top_border;
	52
	53	ioctl(fbdev->fd, FBIOPAN_DISPLAY, &fbdev->fbvar_new);
	54
	55	return (char )fbdev->mem + fbdev->fb_size fbdev->buffer_write;
	56	}
	57
	58	void vout_fbdev_wait_vsync(struct vout_fbdev *fbdev)
	59	{
	60	int arg = 0;
	61	ioctl(fbdev->fd, FBIO_WAITFORVSYNC, &arg);
	62	}
	63
	64	/* it is recommended to call vout_fbdev_clear() before this */
	65	void vout_fbdev_resize(struct vout_fbdev fbdev, int w, int h, int bpp,
	66	int left_border, int right_border, int top_border, int bottom_border, int buffer_cnt)
	67	{
	68	int w_total = left_border + w + right_border;
	69	int h_total = top_border + h + bottom_border;
	70	size_t mem_size;
	71	int ret;
	72
	73	// unblank to be sure the mode is really accepted
	74	ioctl(fbdev->fd, FBIOBLANK, FB_BLANK_UNBLANK);
	75
	76	if (fbdev->fbvar_new.bits_per_pixel != bpp \|\|
	77	w != fbdev->fbvar_new.xres \|\|
	78	h != fbdev->fbvar_new.yres \|\|
	79	w_total != fbdev->fbvar_new.xres_virtual \|\|
	80	h_total > fbdev->fbvar_new.yres_virtual \|\|
	81	left_border != fbdev->fbvar_new.xoffset) {
	82	fbdev->fbvar_new.xres = w;
	83	fbdev->fbvar_new.yres = h;
	84	fbdev->fbvar_new.xres_virtual = w_total;
	85	fbdev->fbvar_new.yres_virtual = h_total;
	86	fbdev->fbvar_new.xoffset = left_border;
	87	fbdev->fbvar_new.yoffset = top_border;
	88	fbdev->fbvar_new.bits_per_pixel = bpp;
	89	printf(" switching to %dx%d@%d\n", w, h, bpp);
	90
	91	// seems to help a bit to avoid glitches
	92	vout_fbdev_wait_vsync(fbdev);
	93
	94	ret = ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_new);
	95	if (ret == -1) {
	96	perror("FBIOPUT_VSCREENINFO ioctl");
	97	return NULL;
	98	}
	99
	100	fbdev->buffer_write = 1;
	101	}
	102
	103	fbdev->buffer_count = buffer_cnt;
	104
	105	if (fbdev->fbvar_new.yres_virtual < h_total * fbdev->buffer_count) {
	106	fbdev->fbvar_new.yres_virtual = h_total * fbdev->buffer_count;
	107	ret = ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_new);
	108	if (ret == -1) {
	109	fbdev->buffer_count = 1;
	110	fbdev->buffer_write = 0;
	111	fprintf(stderr, "Warning: failed to increase virtual resolution, "
	112	"doublebuffering disabled\n");
	113	}
	114	}
	115
	116	fbdev->fb_size = w_total * h_total * bpp / 8;
	117	fbdev->top_border = top_border;
	118	fbdev->bottom_border = bottom_border;
	119
	120	mem_size = fbdev->fb_size * fbdev->buffer_count;
	121	if (fbdev->mem_size >= mem_size)
	122	goto out;
	123
	124	if (fbdev->mem != NULL)
	125	munmap(fbdev->mem, fbdev->mem_size);
	126
	127	fbdev->mem = mmap(0, mem_size, PROT_WRITE\|PROT_READ, MAP_SHARED, fbdev->fd, 0);
	128	if (fbdev->mem == MAP_FAILED && fbdev->buffer_count > 1) {
	129	fprintf(stderr, "Warning: can't map %zd bytes, doublebuffering disabled\n", mem_size);
	130	fbdev->buffer_count = 1;
	131	fbdev->buffer_write = 0;
	132	mem_size = fbdev->fb_size;
	133	fbdev->mem = mmap(0, mem_size, PROT_WRITE\|PROT_READ, MAP_SHARED, fbdev->fd, 0);
	134	}
	135	if (fbdev->mem == MAP_FAILED) {
	136	fbdev->mem = NULL;
	137	fbdev->mem_size = 0;
	138	perror("mmap framebuffer");
	139	return NULL;
	140	}
	141
	142	fbdev->mem_size = mem_size;
	143
	144	out:
	145	return (char )fbdev->mem + fbdev->fb_size fbdev->buffer_write;
	146	}
	147
	148	void vout_fbdev_clear(struct vout_fbdev *fbdev)
	149	{
	150	memset(fbdev->mem, 0, fbdev->mem_size);
	151	}
	152
	153	void vout_fbdev_clear_lines(struct vout_fbdev *fbdev, int y, int count)
	154	{
	155	int stride = fbdev->fbvar_new.xres_virtual * fbdev->fbvar_new.bits_per_pixel / 8;
	156	int i;
	157
	158	if (y + count > fbdev->top_border + fbdev->fbvar_new.yres)
	159	count = fbdev->top_border + fbdev->fbvar_new.yres - y;
	160
	161	if (y >= 0 && count > 0)
	162	for (i = 0; i < fbdev->buffer_count; i++)
	163	memset((char )fbdev->mem + fbdev->fb_size i + y * stride, 0, stride * count);
	164	}
	165
	166	int vout_fbdev_get_fd(struct vout_fbdev *fbdev)
	167	{
	168	return fbdev->fd;
	169	}
	170
	171	struct vout_fbdev vout_fbdev_init(const char fbdev_name, int w, int h, int bpp, int buffer_cnt)
	172	{
	173	struct vout_fbdev *fbdev;
	174	int req_w, req_h;
	175	void *pret;
	176	int ret;
	177
	178	fbdev = calloc(1, sizeof(*fbdev));
	179	if (fbdev == NULL)
	180	return NULL;
	181
	182	fbdev->fd = open(fbdev_name, O_RDWR);
	183	if (fbdev->fd == -1) {
	184	fprintf(stderr, "%s: ", fbdev_name);
	185	perror("open");
	186	goto fail_open;
	187	}
	188
	189	ret = ioctl(fbdev->fd, FBIOGET_VSCREENINFO, &fbdev->fbvar_old);
	190	if (ret == -1) {
	191	perror("FBIOGET_VSCREENINFO ioctl");
	192	goto fail;
	193	}
	194
	195	fbdev->fbvar_new = fbdev->fbvar_old;
	196
	197	req_w = fbdev->fbvar_new.xres;
	198	if (*w != 0)
	199	req_w = *w;
	200	req_h = fbdev->fbvar_new.yres;
	201	if (*h != 0)
	202	req_h = *h;
	203
	204	pret = vout_fbdev_resize(fbdev, req_w, req_h, bpp, 0, 0, 0, 0, buffer_cnt);
	205	if (pret == NULL)
	206	goto fail;
	207
	208	printf("%s: %ix%i@%d\n", fbdev_name, fbdev->fbvar_new.xres, fbdev->fbvar_new.yres,
	209	fbdev->fbvar_new.bits_per_pixel);
	210	*w = fbdev->fbvar_new.xres;
	211	*h = fbdev->fbvar_new.yres;
	212
	213	memset(fbdev->mem, 0, fbdev->mem_size);
	214
	215	// some checks
	216	ret = 0;
	217	ret = ioctl(fbdev->fd, FBIO_WAITFORVSYNC, &ret);
	218	if (ret != 0)
	219	fprintf(stderr, "Warning: vsync doesn't seem to be supported\n");
	220
	221	if (fbdev->buffer_count > 1) {
	222	fbdev->buffer_write = 0;
	223	fbdev->fbvar_new.yoffset = fbdev->fbvar_new.yres * (fbdev->buffer_count - 1);
	224	ret = ioctl(fbdev->fd, FBIOPAN_DISPLAY, &fbdev->fbvar_new);
	225	if (ret != 0) {
	226	fbdev->buffer_count = 1;
	227	fprintf(stderr, "Warning: can't pan display, doublebuffering disabled\n");
	228	}
	229	}
	230
	231	printf("fbdev initialized.\n");
	232	return fbdev;
	233
	234	fail:
	235	close(fbdev->fd);
	236	fail_open:
	237	free(fbdev);
	238	return NULL;
	239	}
	240
	241	void vout_fbdev_finish(struct vout_fbdev *fbdev)
	242	{
	243	ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_old);
	244	if (fbdev->mem != MAP_FAILED)
	245	munmap(fbdev->mem, fbdev->mem_size);
	246	if (fbdev->fd >= 0)
	247	close(fbdev->fd);
	248	fbdev->mem = NULL;
	249	fbdev->fd = -1;
	250	free(fbdev);
	251	}
	252