gnu: blender: Restore version 2.79b for systems without OpenGL 3.

Fixes <https://bugs.gnu.org/33882>.

* gnu/packages/graphics.scm (blender-2.79): New variable.
(blender)[description]: Remove obsolete claim that the stable
release no longer works in Guix.
* gnu/packages/patches/blender-2.79-newer-ffmpeg.patch,
gnu/packages/patches/blender-2.79-python-3.7-fix.patch: New files.
* gnu/local.mk (dist_patch_DATA): Add them.

2 files changed, 123 insertions, 0 deletions

diff --git a/gnu/packages/patches/blender-2.79-newer-ffmpeg.patch b/gnu/packages/patches/blender-2.79-newer-ffmpeg.patch
new file mode 100644
index 0000000000..363489bc70
--- /dev/null
+++ b/gnu/packages/patches/blender-2.79-newer-ffmpeg.patch
@@ -0,0 +1,80 @@
+https://sources.debian.org/data/main/b/blender/2.79.b+dfsg0-4/debian/patches/0008-fix_building_with_latest_versions_of_FFmpeg.patch
+
+From: Bastien Montagne <montagne29@wanadoo.fr>
+Date: Tue, 8 May 2018 16:00:52 +0200
+Subject: fix_building_with_latest_versions_of_FFmpeg
+
+Some years-old deprecated stuff has now been removed.
+
+Correct solution is probably to use valid defines etc. in own code, but
+this is more FFMEPG maintainer task (since it also may change how old
+FFMPEG we do support...).
+---
+ intern/ffmpeg/ffmpeg_compat.h                  | 39 ++++++++++++++++++++++++++
+ source/blender/blenkernel/intern/writeffmpeg.c |  3 +-
+ 2 files changed, 41 insertions(+), 1 deletion(-)
+
+diff --git a/intern/ffmpeg/ffmpeg_compat.h b/intern/ffmpeg/ffmpeg_compat.h
+index 9c06c8a..f7f437c 100644
+--- a/intern/ffmpeg/ffmpeg_compat.h
++++ b/intern/ffmpeg/ffmpeg_compat.h
+@@ -109,6 +109,45 @@ int av_sample_fmt_is_planar(enum AVSampleFormat sample_fmt)
+ 
+ #endif
+ 
++/* XXX TODO Probably fix to correct modern flags in code? Not sure how old FFMPEG we want to support though,
++ * so for now this will do. */
++
++#ifndef FF_MIN_BUFFER_SIZE
++#  ifdef AV_INPUT_BUFFER_MIN_SIZE
++#    define FF_MIN_BUFFER_SIZE AV_INPUT_BUFFER_MIN_SIZE
++#  endif
++#endif
++
++#ifndef FF_INPUT_BUFFER_PADDING_SIZE
++#  ifdef AV_INPUT_BUFFER_PADDING_SIZE
++#    define FF_INPUT_BUFFER_PADDING_SIZE AV_INPUT_BUFFER_PADDING_SIZE
++#  endif
++#endif
++
++#ifndef CODEC_FLAG_GLOBAL_HEADER
++#  ifdef AV_CODEC_FLAG_GLOBAL_HEADER
++#    define CODEC_FLAG_GLOBAL_HEADER AV_CODEC_FLAG_GLOBAL_HEADER
++#  endif
++#endif
++
++#ifndef CODEC_FLAG_GLOBAL_HEADER
++#  ifdef AV_CODEC_FLAG_GLOBAL_HEADER
++#    define CODEC_FLAG_GLOBAL_HEADER AV_CODEC_FLAG_GLOBAL_HEADER
++#  endif
++#endif
++
++#ifndef CODEC_FLAG_INTERLACED_DCT
++#  ifdef AV_CODEC_FLAG_INTERLACED_DCT
++#    define CODEC_FLAG_INTERLACED_DCT AV_CODEC_FLAG_INTERLACED_DCT
++#  endif
++#endif
++
++#ifndef CODEC_FLAG_INTERLACED_ME
++#  ifdef AV_CODEC_FLAG_INTERLACED_ME
++#    define CODEC_FLAG_INTERLACED_ME AV_CODEC_FLAG_INTERLACED_ME
++#  endif
++#endif
++
+ /* FFmpeg upstream 1.0 is the first who added AV_ prefix. */
+ #if LIBAVCODEC_VERSION_INT < AV_VERSION_INT(54, 59, 100)
+ #  define AV_CODEC_ID_NONE CODEC_ID_NONE
+diff --git a/source/blender/blenkernel/intern/writeffmpeg.c b/source/blender/blenkernel/intern/writeffmpeg.c
+index a19e414..04d508a 100644
+--- a/source/blender/blenkernel/intern/writeffmpeg.c
++++ b/source/blender/blenkernel/intern/writeffmpeg.c
+@@ -605,7 +605,8 @@ static AVStream *alloc_video_stream(FFMpegContext *context, RenderData *rd, int
+ 	c->rc_buffer_aggressivity = 1.0;
+ #endif
+ 
+-	c->me_method = ME_EPZS;
++	/* Deprecated and not doing anything since July 2015, deleted in recent ffmpeg */
++	//c->me_method = ME_EPZS;
+ 	
+ 	codec = avcodec_find_encoder(c->codec_id);
+ 	if (!codec)
diff --git a/gnu/packages/patches/blender-2.79-python-3.7-fix.patch b/gnu/packages/patches/blender-2.79-python-3.7-fix.patch
new file mode 100644
index 0000000000..fd1d8ba437
--- /dev/null
+++ b/gnu/packages/patches/blender-2.79-python-3.7-fix.patch
@@ -0,0 +1,43 @@
+Copied from https://git.blender.org/gitweb/gitweb.cgi/blender.git/patch/1db47a2ccd1e68994bf8140eba6cc2a26a2bc91f
+Fixes <https://bugs.gnu.org/33608>.
+
+From 1db47a2ccd1e68994bf8140eba6cc2a26a2bc91f Mon Sep 17 00:00:00 2001
+From: Campbell Barton <ideasman42@gmail.com>
+Date: Thu, 12 Jul 2018 08:28:06 +0200
+Subject: [PATCH] Fix PyRNA class registration w/ Python 3.7
+
+In Python3.7 this now raises an error.
+---
+ source/blender/python/intern/bpy_rna.c | 5 +++++
+ 1 file changed, 5 insertions(+)
+
+diff --git a/source/blender/python/intern/bpy_rna.c b/source/blender/python/intern/bpy_rna.c
+index 9052b6f580a..80b0aa7a51b 100644
+--- a/source/blender/python/intern/bpy_rna.c
++++ b/source/blender/python/intern/bpy_rna.c
+@@ -7577,10 +7577,12 @@ static int bpy_class_validate_recursive(PointerRNA *dummyptr, StructRNA *srna, v
+ 		if (!(flag & PROP_REGISTER))
+ 			continue;
+ 
++		/* TODO(campbell): Use Python3.7x _PyObject_LookupAttr(), also in the macro below. */
+ 		identifier = RNA_property_identifier(prop);
+ 		item = PyObject_GetAttrString(py_class, identifier);
+ 
+ 		if (item == NULL) {
++			PyErr_Clear();
+ 			/* Sneaky workaround to use the class name as the bl_idname */
+ 
+ #define     BPY_REPLACEMENT_STRING(rna_attr, py_attr)                         \
+@@ -7596,6 +7598,9 @@ static int bpy_class_validate_recursive(PointerRNA *dummyptr, StructRNA *srna, v
+ 					}                                                         \
+ 					Py_DECREF(item);                                          \
+ 				}                                                             \
++				else {                                                        \
++					PyErr_Clear();                                            \
++				}                                                             \
+ 			}  /* intentionally allow else here */
+ 
+ 			if (false) {}  /* needed for macro */
+-- 
+2.20.1
+