Include SDL information in system info text.

Adds bpy.app.sdl to expose SDL version information.

When SDL is not available on a Linux system, certain Blender features
are silently disabled (like joystick support in the BGE). This change
is the first step towards making it more obvious why something isn't
working.

SDL information is exposed to Python via bpy.app.sdl, in the same way
as OCIO and OIIO information is exposed.

Generated system-info.txt contains SDL loading method (linked or
dynamically loaded by Blender) and SDL version number.

Reviewed by: sergey, campbellbarton

Differential Revision: https://developer.blender.org/D1112

1 files changed, 136 insertions, 0 deletions

diff --git a/source/blender/python/intern/bpy_app_sdl.c b/source/blender/python/intern/bpy_app_sdl.c
new file mode 100644
index 00000000000..c91595b5900
--- /dev/null
+++ b/source/blender/python/intern/bpy_app_sdl.c
@@ -0,0 +1,136 @@
+/*
+ * ***** BEGIN GPL LICENSE BLOCK *****
+ *
+ * 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 2
+ * 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, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * Contributor(s): Sergey Sharybin, Sybren A. Stuvel
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+
+/** \file blender/python/intern/bpy_app_sdl.c
+ *  \ingroup pythonintern
+ */
+
+#include <Python.h>
+#include "BLI_utildefines.h"
+
+#include "bpy_app_sdl.h"
+
+#ifdef WITH_SDL
+#  include "SDL.h"
+#  ifdef WITH_SDL_DYNLOAD
+#    include "sdlew.h"
+#  endif
+#endif
+
+static PyTypeObject BlenderAppSDLType;
+
+static PyStructSequence_Field app_sdl_info_fields[] = {
+	{(char *)"supported", (char *)("Boolean, True when Blender is built with SDL support")},
+	{(char *)"version", (char *)("The SDL version as a tuple of 3 numbers")},
+	{(char *)"version_string", (char *)("The SDL version formatted as a string")},
+	{(char *)"available", (char *)("Boolean, True when SDL is available. This is False when "
+	                               "either *supported* is False, or *dynload* is True and "
+	                               "Blender cannot find the correct library.")},
+    {NULL}
+};
+
+static PyStructSequence_Desc app_sdl_info_desc = {
+	(char *)"bpy.app.sdl",     /* name */
+	(char *)"This module contains information about SDL blender is linked against",    /* doc */
+	app_sdl_info_fields,    /* fields */
+	ARRAY_SIZE(app_sdl_info_fields) - 1
+};
+
+static PyObject *make_sdl_info(void)
+{
+	PyObject *sdl_info;
+	int pos = 0;
+#ifdef WITH_SDL
+	bool sdl_available = false;
+	SDL_version version = {0, 0, 0};
+#endif
+
+	sdl_info = PyStructSequence_New(&BlenderAppSDLType);
+	if (sdl_info == NULL) {
+		return NULL;
+	}
+
+#define SetStrItem(str) \
+	PyStructSequence_SET_ITEM(sdl_info, pos++, PyUnicode_FromString(str))
+
+#define SetObjItem(obj) \
+	PyStructSequence_SET_ITEM(sdl_info, pos++, obj)
+
+#ifdef WITH_SDL
+	SetObjItem(PyBool_FromLong(1));
+
+# ifdef WITH_SDL_DYNLOAD
+	if (sdlewInit() == SDLEW_SUCCESS) {
+		SDL_GetVersion(&version);
+		sdl_available = true;
+	}
+# else // WITH_SDL_DYNLOAD=OFF
+	sdl_available = true;
+#  if SDL_MAJOR_VERSION >= 2
+	SDL_GetVersion(&version);
+#  else
+	SDL_VERSION(&version);
+#  endif
+# endif
+
+	SetObjItem(Py_BuildValue("(iii)", version.major, version.minor, version.patch));
+	if (sdl_available) {
+		SetObjItem(PyUnicode_FromFormat("%d.%d.%d", version.major, version.minor, version.patch));
+	}
+	else {
+		SetStrItem("Unknown");
+	}
+	SetObjItem(PyBool_FromLong(sdl_available));
+
+#else // WITH_SDL=OFF
+	SetObjItem(PyBool_FromLong(0));
+	SetObjItem(Py_BuildValue("(iii)", 0, 0, 0));
+	SetStrItem("Unknown");
+	SetObjItem(PyBool_FromLong(0));
+#endif
+
+	if (PyErr_Occurred()) {
+		Py_CLEAR(sdl_info);
+		return NULL;
+	}
+
+#undef SetStrItem
+#undef SetObjItem
+
+	return sdl_info;
+}
+
+PyObject *BPY_app_sdl_struct(void)
+{
+	PyObject *ret;
+
+	PyStructSequence_InitType(&BlenderAppSDLType, &app_sdl_info_desc);
+
+	ret = make_sdl_info();
+
+	/* prevent user from creating new instances */
+	BlenderAppSDLType.tp_init = NULL;
+	BlenderAppSDLType.tp_new = NULL;
+	BlenderAppSDLType.tp_hash = (hashfunc)_Py_HashPointer; /* without this we can't do set(sys.modules) [#29635] */
+
+	return ret;
+}