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xshm: Allow to operate without shm extension

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In most cases it doesn't make a nice gameplay but is still useful for debugging
on remote system and xnest
This commit is contained in:
Vladimir Serbinenko 2020-05-24 05:01:48 +02:00
parent c4b4961ed1
commit 62bb1d4da4
1 changed files with 39 additions and 14 deletions
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53
gfx/drivers/xshm_gfx.c
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@ -33,15 +33,16 @@
#endif
#include "../../configuration.h"
#include "../font_driver.h"
#include "../common/x11_common.h"
#include "../../verbosity.h"
typedef struct xshm
{
int width;
int height;
bool use_shm;
uint8_t *fbptr;
XShmSegmentInfo shmInfo;
XImage* image;
@ -58,6 +59,14 @@ static void *xshm_gfx_init(const video_info_t *video,
g_x11_dpy = XOpenDisplay(NULL);
xshm->use_shm = true;
if (!XShmQueryExtension(g_x11_dpy))
{
RARCH_LOG("[X11]: XShm extension not found.\n");
xshm->use_shm = false;
}
#ifdef RARCH_INTERNAL
parent = DefaultRootWindow(g_x11_dpy);
#else
@ -71,16 +80,28 @@ static void *xshm_gfx_init(const video_info_t *video,
XSetWindowBackground(g_x11_dpy, g_x11_win, 0);
XMapWindow(g_x11_dpy, g_x11_win);
xshm->shmInfo.shmid = shmget(IPC_PRIVATE, sizeof(uint32_t) * video->width * video->height,
IPC_CREAT|0600);
if (xshm->shmInfo.shmid<0) abort();//seems like an out of memory situation... let's just blow up
if (xshm->use_shm)
{
xshm->shmInfo.shmid = shmget(IPC_PRIVATE, sizeof(uint32_t) * video->width * video->height,
IPC_CREAT|0600);
if (xshm->shmInfo.shmid<0) abort();//seems like an out of memory situation... let's just blow up
xshm->shmInfo.shmaddr = (char*)shmat(xshm->shmInfo.shmid, 0, 0);
xshm->shmInfo.readOnly = False;
XShmAttach(g_x11_dpy, &xshm->shmInfo);
XSync(g_x11_dpy, False);//no idea why this is required, but I get weird errors without it
xshm->image = XShmCreateImage(g_x11_dpy, NULL, 24, ZPixmap,
xshm->shmInfo.shmaddr, &xshm->shmInfo, video->width, video->height);
xshm->shmInfo.shmaddr = (char*)shmat(xshm->shmInfo.shmid, 0, 0);
xshm->shmInfo.readOnly = False;
XShmAttach(g_x11_dpy, &xshm->shmInfo);
XSync(g_x11_dpy, False);//no idea why this is required, but I get weird errors without it
xshm->image = XShmCreateImage(g_x11_dpy, NULL, 24, ZPixmap,
xshm->shmInfo.shmaddr, &xshm->shmInfo, video->width, video->height);
xshm->fbptr = (uint8_t*)xshm->shmInfo.shmaddr;
} else {
size_t pitch = video->width * 4;
void *data = malloc (pitch * video->height);
if (!data) abort();//seems like an out of memory situation... let's just blow up
xshm->image = XCreateImage(g_x11_dpy, NULL, 24, ZPixmap, 0,
data, video->width, video->height, 8, pitch);
xshm->fbptr = data;
XSync(g_x11_dpy, False);
}
xshm->gc = XCreateGC(g_x11_dpy, g_x11_win, 0, NULL);
@ -119,15 +140,19 @@ static bool xshm_gfx_frame(void *data, const void *frame, unsigned width,
bool menu_is_alive = video_info->menu_is_alive;
for (y = 0; y < height; y++)
memcpy((uint8_t*)xshm->shmInfo.shmaddr + sizeof(uint32_t)*xshm->width*y,
memcpy(xshm->fbptr + sizeof(uint32_t)*xshm->width*y,
(uint8_t*)frame + pitch*y, pitch);
#ifdef HAVE_MENU
menu_driver_frame(menu_is_alive, video_info);
#endif
XShmPutImage(g_x11_dpy, g_x11_win, xshm->gc, xshm->image,
0, 0, 0, 0, xshm->width, xshm->height, False);
if (xshm->use_shm)
XShmPutImage(g_x11_dpy, g_x11_win, xshm->gc, xshm->image,
0, 0, 0, 0, xshm->width, xshm->height, False);
else
XPutImage(g_x11_dpy, g_x11_win, xshm->gc, xshm->image,
0, 0, 0, 0, xshm->width, xshm->height);
XFlush(g_x11_dpy);
return true;