mesa: sort out PROVIDES for the glvnd case

If mesa is built with GLVND enabled, it doesn't provide GL / GL ES / EGL
libraries directly. Instead it provides two ICD libraries: libEGL_mesa.0
and libGLX_mesa.so.0. Remove virtual provides from the glvnd case
(dropping incorrect virtual/libglx provider while we are at it) and
replace those with runtime providers (to be used by libglvnd in order to
pull corresponding ICDs).

(From OE-Core rev: 9d3b4c9bc40392ba87f110ec5db0dedf381b8c4a)

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/conf/distro/include/default-providers.inc

@@ -7,8 +7,9 @@ PREFERRED_PROVIDER_virtual/xserver-xf86 ?= "xserver-xorg"
 PREFERRED_PROVIDER_virtual/libsdl2 ?= "libsdl2"
 PREFERRED_PROVIDER_virtual/libsdl2-native ?= "libsdl2-native"
 PREFERRED_PROVIDER_virtual/egl ?= "mesa"
+PREFERRED_PROVIDER_virtual/libegl-icd ?= "mesa"
 PREFERRED_PROVIDER_virtual/libgl ?= "mesa"
-PREFERRED_PROVIDER_virtual/libglx ?= "mesa"
+PREFERRED_PROVIDER_virtual/libglx-icd ?= "mesa"
 PREFERRED_PROVIDER_virtual/libgl-native ?= "mesa-native"
 PREFERRED_PROVIDER_virtual/nativesdk-libgl ?= "nativesdk-mesa"
 PREFERRED_PROVIDER_virtual/libgles1 ?= "mesa"

meta/recipes-graphics/mesa/mesa.inc

@@ -37,11 +37,13 @@ do_install:append() {
 
 DEPENDS = "expat makedepend-native flex-native bison-native libxml2-native zlib chrpath-replacement-native python3-mako-native gettext-native python3-pyyaml-native"
 EXTRANATIVEPATH += "chrpath-native"
-PROVIDES = " \
+GLPROVIDES = " \
     ${@bb.utils.contains('PACKAGECONFIG', 'opengl', 'virtual/libgl', '', d)} \
-    ${@bb.utils.contains('PACKAGECONFIG', 'glvnd', 'virtual/libglx', '', d)} \
     ${@bb.utils.contains('PACKAGECONFIG', 'gles', 'virtual/libgles1 virtual/libgles2 virtual/libgles3', '', d)} \
     ${@bb.utils.contains('PACKAGECONFIG', 'egl', 'virtual/egl', '', d)} \
+"
+PROVIDES = " \
+    ${@bb.utils.contains('PACKAGECONFIG', 'glvnd', '', d.getVar('GLPROVIDES'), d)} \
     ${@bb.utils.contains('PACKAGECONFIG', 'gbm', 'virtual/libgbm', '', d)} \
     virtual/mesa \
     "
@@ -274,7 +276,11 @@ python __anonymous() {
 
     d.setVar("DEBIAN_NOAUTONAME:%slibopencl-mesa%s" % (mlprefix, suffix), "1")
 
-    if 'glvnd' not in pkgconfig:
+    if 'glvnd' in pkgconfig:
+        for p in ("libegl", "libglx"):
+            fullp = mlprefix + p + "-mesa" + suffix
+            d.appendVar("RPROVIDES:" + fullp, '%s-icd' % p)
+    else:
         for p in (("egl", "libegl", "libegl1"),
                   ("opengl", "libgl", "libgl1"),
                   ("gles", "libgles1", "libglesv1-cm1"),