From f4a5cbbe5b5012abdf987e66ac56df236c58be16 Mon Sep 17 00:00:00 2001
From: Alcaro <floating@muncher.se>
Date: Sun, 11 Oct 2015 09:50:01 +0200
Subject: [PATCH] Add this half-finished (okay, 5%-finished) driver.

---
 Makefile.common    |  6 ++++
 gfx/drivers/xshm.c | 74 ++++++++++++++++++++++++++++++++++++++++++++++
 gfx/video_driver.h |  1 +
 qb/config.libs.sh  |  5 +++-
 4 files changed, 85 insertions(+), 1 deletion(-)
 create mode 100644 gfx/drivers/xshm.c

diff --git a/Makefile.common b/Makefile.common
index cb754c70a8..e22288d68a 100644
--- a/Makefile.common
+++ b/Makefile.common
@@ -703,6 +703,12 @@ ifeq ($(HAVE_XVIDEO), 1)
    DEFINES += $(XVIDEO_CFLAGS)
 endif
 
+ifeq ($(HAVE_XSHM), 1)
+   OBJ += gfx/drivers/xshm.o
+   LIBS += $(XSHM_LIBS)
+   DEFINES += $(XSHM_CFLAGS)
+endif
+
 ifeq ($(HAVE_CG), 1)
 	DEFINES += -DHAVE_CG
    OBJ += gfx/drivers_shader/shader_gl_cg.o
diff --git a/gfx/drivers/xshm.c b/gfx/drivers/xshm.c
new file mode 100644
index 0000000000..9ff612edfd
--- /dev/null
+++ b/gfx/drivers/xshm.c
@@ -0,0 +1,74 @@
+/*  RetroArch - A frontend for libretro.
+ *  Copyright (C) 2010-2014 - Hans-Kristian Arntzen
+ *
+ *  RetroArch 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 Found-
+ *  ation, either version 3 of the License, or (at your option) any later version.
+ *
+ *  RetroArch 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 RetroArch.
+ *  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "../../driver.h"
+#include "../../general.h"
+#include <stdlib.h>
+#include <string.h>
+#include <signal.h>
+#include <math.h>
+#include "../video_viewport.h"
+#include "../video_monitor.h"
+#include "../font_renderer_driver.h"
+#include <retro_inline.h>
+
+#include "../common/x11_common.h"
+
+#include <stdlib.h>
+/*#include <sys/ipc.h>*/
+#include <sys/shm.h>
+#include <X11/Xlib.h>
+#include <X11/Xutil.h>
+#include <X11/extensions/XShm.h>
+
+typedef struct xshm
+{
+	Display* display;
+	int screen;
+	
+	Window parentwindow;
+	Window wndw;
+	
+	unsigned int width;
+	unsigned int height;
+	unsigned int pitch;
+	videoformat bpp;
+	
+	XShmSegmentInfo shmInfo;
+	XImage* image;
+	GC gc;
+} xshm_t;
+
+video_driver_t video_xshm = {
+   NULL,/*xshm_init,*/
+   NULL,/*xshm_frame,*/
+   NULL,/*xshm_set_nonblock_state,*/
+   NULL,/*xshm_alive,*/
+   NULL,/*xshm_focus,*/
+   NULL,/*xshm_suppress_screensaver,*/
+   NULL,/*xshm_has_windowed,*/
+   NULL,/*xshm_set_shader,*/
+   NULL,/*xshm_free,*/
+   "xshm",
+   NULL, /* set_viewport */
+   NULL,/*xshm_set_rotation,*/
+   NULL,/*xshm_viewport_info,*/
+   NULL,/*xshm_read_viewport,*/
+   NULL, /* read_frame_raw */
+#ifdef HAVE_OVERLAY
+   NULL, /* overlay_interface */
+#endif
+   NULL/*xshm_get_poke_interface*/
+};
diff --git a/gfx/video_driver.h b/gfx/video_driver.h
index e2843a22ee..fd9d6f0004 100644
--- a/gfx/video_driver.h
+++ b/gfx/video_driver.h
@@ -204,6 +204,7 @@ extern video_driver_t video_omap;
 extern video_driver_t video_exynos;
 extern video_driver_t video_dispmanx;
 extern video_driver_t video_sunxi;
+extern video_driver_t video_xshm;
 extern video_driver_t video_null;
 
 enum rarch_display_type
diff --git a/qb/config.libs.sh b/qb/config.libs.sh
index 367d57dbdf..777fd57715 100644
--- a/qb/config.libs.sh
+++ b/qb/config.libs.sh
@@ -353,7 +353,7 @@ fi
 
 check_pkgconf FREETYPE freetype2
 check_pkgconf X11 x11
-[ "$HAVE_X11" = "no" ] && HAVE_XEXT=no && HAVE_XF86VM=no && HAVE_XINERAMA=no
+[ "$HAVE_X11" = "no" ] && HAVE_XEXT=no && HAVE_XF86VM=no && HAVE_XINERAMA=no && HAVE_XSHM=no
 
 check_pkgconf WAYLAND wayland-egl
 
@@ -377,6 +377,9 @@ if [ "$HAVE_UDEV" != "no" ]; then
    fi
 fi
 
+#this one is broken (XShm.h requires some other X headers first), but xshm itself doesn't work either, so it's okay
+check_header XSHM X11/extensions/XShm.h
+
 check_header PARPORT linux/parport.h
 check_header PARPORT linux/ppdev.h