package/mesa3d: make it aware of libglvnd and support it when present

When libglvnd is enabled, mesa3d must be told so, so as it installs its
libraries with the vendor suffix (e.g. libEGL_mesa.so instead of
libEGL.so).

Additionally, the provider (in Buildroot parlance) is libglvnd, not mesa3d.

Signed-off-by: Jakub Skrzypnik <jskrzypnik@novomatic-tech.com>
[yann.morin.1998@free.fr:
  - don't override the _PROVIDES variable, only assign when needed
]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
Tested-by: Romain Naour <romain.naour@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

package/mesa3d/Config.in

@@ -423,7 +423,8 @@ comment "gbm support needs a dri driver or a gallium driver w/ EGL support."
 config BR2_PACKAGE_MESA3D_OPENGL_GLX
 	bool "OpenGL GLX"
 	depends on BR2_PACKAGE_XORG7
-	select BR2_PACKAGE_HAS_LIBGL
+	select BR2_PACKAGE_HAS_LIBGL if !BR2_PACKAGE_LIBGLVND
+	select BR2_PACKAGE_LIBGLVND_DISPATCH_GL if BR2_PACKAGE_LIBGLVND
 	select BR2_PACKAGE_MESA3D_NEEDS_X11
 	help
 	  Enable GLX graphic acceleration (OpenGL + X11).
@@ -433,7 +434,8 @@ comment "OpenGL GLX support needs X11"
 
 config BR2_PACKAGE_MESA3D_OPENGL_EGL
 	bool "OpenGL EGL"
-	select BR2_PACKAGE_HAS_LIBEGL
+	select BR2_PACKAGE_HAS_LIBEGL if !BR2_PACKAGE_LIBGLVND
+	select BR2_PACKAGE_LIBGLVND_DISPATCH_EGL if BR2_PACKAGE_LIBGLVND
 	select BR2_PACKAGE_HAS_LIBEGL_WAYLAND
 	select BR2_PACKAGE_MESA3D_GBM
 	help
@@ -442,7 +444,8 @@ config BR2_PACKAGE_MESA3D_OPENGL_EGL
 
 config BR2_PACKAGE_MESA3D_OPENGL_ES
 	bool "OpenGL ES"
-	select BR2_PACKAGE_HAS_LIBGLES
+	select BR2_PACKAGE_HAS_LIBGLES if !BR2_PACKAGE_LIBGLVND
+	select BR2_PACKAGE_LIBGLVND_DISPATCH_GLES if BR2_PACKAGE_LIBGLVND
 	help
 	  Use the Khronos OpenGL ES APIs. This is commonly used on
 	  embedded systems and represents a subset of the OpenGL API.
@@ -453,13 +456,13 @@ config BR2_PACKAGE_PROVIDES_LIBGBM
 	default "mesa3d" if BR2_PACKAGE_MESA3D_GBM
 
 config BR2_PACKAGE_PROVIDES_LIBGL
-	default "mesa3d" if BR2_PACKAGE_MESA3D_OPENGL_GLX
+	default "mesa3d" if BR2_PACKAGE_MESA3D_OPENGL_GLX && !BR2_PACKAGE_LIBGLVND
 
 config BR2_PACKAGE_PROVIDES_LIBEGL
-	default "mesa3d" if BR2_PACKAGE_MESA3D_OPENGL_EGL
+	default "mesa3d" if BR2_PACKAGE_MESA3D_OPENGL_EGL && !BR2_PACKAGE_LIBGLVND
 
 config BR2_PACKAGE_PROVIDES_LIBGLES
-	default "mesa3d" if BR2_PACKAGE_MESA3D_OPENGL_ES
+	default "mesa3d" if BR2_PACKAGE_MESA3D_OPENGL_ES && !BR2_PACKAGE_LIBGLVND
 
 config BR2_PACKAGE_PROVIDES_LIBOPENCL
 	default "mesa3d" if BR2_PACKAGE_MESA3D_OPENCL

package/mesa3d/mesa3d.mk

@@ -167,9 +167,9 @@ MESA3D_CONF_OPTS += -Dopengl=true
 # we do not need libva support in mesa3d, therefore disable this option
 MESA3D_CONF_OPTS += -Dgallium-va=disabled
 
-# libGL is only provided for a full xorg stack
+# libGL is only provided for a full xorg stack, without libglvnd
 ifeq ($(BR2_PACKAGE_MESA3D_OPENGL_GLX),y)
-MESA3D_PROVIDES += libgl
+MESA3D_PROVIDES += $(if $(BR2_PACKAGE_LIBGLVND),,libgl)
 else
 define MESA3D_REMOVE_OPENGL_HEADERS
 	rm -rf $(STAGING_DIR)/usr/include/GL/
@@ -207,7 +207,7 @@ MESA3D_CONF_OPTS += \
 endif
 
 ifeq ($(BR2_PACKAGE_MESA3D_OPENGL_EGL),y)
-MESA3D_PROVIDES += libegl
+MESA3D_PROVIDES += $(if $(BR2_PACKAGE_LIBGLVND),,libegl)
 MESA3D_CONF_OPTS += \
 	-Degl=enabled
 else
@@ -216,7 +216,7 @@ MESA3D_CONF_OPTS += \
 endif
 
 ifeq ($(BR2_PACKAGE_MESA3D_OPENGL_ES),y)
-MESA3D_PROVIDES += libgles
+MESA3D_PROVIDES += $(if $(BR2_PACKAGE_LIBGLVND),,libgles)
 MESA3D_CONF_OPTS += -Dgles1=enabled -Dgles2=enabled
 else
 MESA3D_CONF_OPTS += -Dgles1=disabled -Dgles2=disabled
@@ -271,4 +271,11 @@ ifeq ($(BR2_m68k),y)
 MESA3D_CFLAGS += -mlong-jump-table-offsets
 endif
 
+ifeq ($(BR2_PACKAGE_LIBGLVND),y)
+MESA3D_DEPENDENCIES += libglvnd
+MESA3D_CONF_OPTS += -Dglvnd=true
+else
+MESA3D_CONF_OPTS += -Dglvnd=false
+endif
+
 $(eval $(meson-package))