[Buildroot] [PATCH v2 1/7] package/opengl/libgbm: new virtual package

[Kamel Bouhara]

From: Bernd Kuhls <bernd.kuhls at t-online.de>

Kodi 18.0-Leia will implement stand-alone gbm support alongside x11 &
wayland.  To enable building libgbm in mesa3d without x11 & wayland we
need to create a virtual package for libgbm.

Also other packages besides mesa3d may provide libgbm.so, see
http://patchwork.ozlabs.org/patch/647235/
http://patchwork.ozlabs.org/patch/939703/

We also introduce two feature that shall help user choosing the version
implemented by a libgbm provider. This foresightly avoid building package
without having the required libgbm version (e.g. kmscube, qt5, sdl2
etc.)

Signed-off-by: Bernd Kuhls <bernd.kuhls at t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni at bootlin.com>
Signed-off-by: Kamel Bouhara <kamel.bouhara at bootlin.com>
[ Kamel : introduce gbm api features ]
---
Changes v1 -> v2:
 - Squashed patch 1/2
 - Added more relevant comment for each features added

 package/opengl/Config.in        |  1 +
 package/opengl/libgbm/Config.in | 24 ++++++++++++++++++++++++
 package/opengl/libgbm/libgbm.mk |  9 +++++++++
 3 files changed, 34 insertions(+)
 create mode 100644 package/opengl/libgbm/Config.in
 create mode 100644 package/opengl/libgbm/libgbm.mk

diff --git a/package/opengl/Config.in b/package/opengl/Config.in
index cbc001427d..cfa51def45 100644
--- a/package/opengl/Config.in
+++ b/package/opengl/Config.in
@@ -1,5 +1,6 @@
 source "package/opengl/libgl/Config.in"
 source "package/opengl/libegl/Config.in"
+source "package/opengl/libgbm/Config.in"
 source "package/opengl/libgles/Config.in"
 source "package/opengl/libopencl/Config.in"
 source "package/opengl/libopenvg/Config.in"
diff --git a/package/opengl/libgbm/Config.in b/package/opengl/libgbm/Config.in
new file mode 100644
index 0000000000..7aa3efb97a
--- /dev/null
+++ b/package/opengl/libgbm/Config.in
@@ -0,0 +1,24 @@
+config BR2_PACKAGE_HAS_LIBGBM
+	bool
+
+config BR2_PACKAGE_PROVIDES_LIBGBM
+	string
+	depends on BR2_PACKAGE_HAS_LIBGBM
+
+config BR2_PACKAGE_LIBGBM_HAS_FEATURE_FORMAT_MODIFIER_PLANE_COUNT
+	bool
+	depends on BR2_PACKAGE_HAS_LIBGBM
+
+# gbm implementations should select this option if they provide the
+# format modifier plane count feature. This API was initially introduced
+# in mesa3d version 17. A gbm implementation provides this feature if it
+# is implement function gbm_device_get_format_modifier_plane_count.
+
+config BR2_PACKAGE_LIBGBM_HAS_FEATURE_DMA_BUF
+	bool
+	depends on BR2_PACKAGE_HAS_LIBGBM
+
+# gbm implementations should select this option if they provide the
+# dma buffer feature. This API was initially introduced in mesa3d
+# version 10. A gbm implementation provides this feature if it
+# is implement function gbm_bo_get_fd.
diff --git a/package/opengl/libgbm/libgbm.mk b/package/opengl/libgbm/libgbm.mk
new file mode 100644
index 0000000000..ecab234720
--- /dev/null
+++ b/package/opengl/libgbm/libgbm.mk
@@ -0,0 +1,9 @@
+################################################################################
+#
+# libgbm
+#
+################################################################################
+
+# This package requires to install a gbm.pc which needs
+# to be provided by GBM providers.
+$(eval $(virtual-package))
-- 
2.30.2