Initial multi-x11/wayland backend setup

Signed-off-by: falkTX <falktx@falktx.com>

Makefile.base.mk

@@ -556,8 +556,16 @@ else ifeq ($(WINDOWS),true)
 OPENGL_FLAGS =
 OPENGL_LIBS  = -lopengl32
 else
-OPENGL_FLAGS = $(shell $(PKG_CONFIG) --cflags gl x11)
-OPENGL_LIBS  = $(shell $(PKG_CONFIG) --libs gl x11)
+OPENGL_FLAGS = $(shell $(PKG_CONFIG) --cflags gl)
+OPENGL_LIBS  = $(shell $(PKG_CONFIG) --libs gl)
+ifeq ($(HAVE_X11),true)
+OPENGL_FLAGS += $(shell $(PKG_CONFIG) --cflags x11)
+OPENGL_LIBS  += $(shell $(PKG_CONFIG) --libs x11)
+endif
+ifeq ($(HAVE_WAYLAND_EGL),true)
+OPENGL_FLAGS += $(shell $(PKG_CONFIG) --cflags egl wayland-egl)
+OPENGL_LIBS  += $(shell $(PKG_CONFIG) --libs egl wayland-egl)
+endif
 endif
 
 HAVE_CAIRO_OR_OPENGL = true

dgl/src/pugl-upstream

@@ -1 +1 @@
-Subproject commit 43c0944a2e28c6921bc827ac46f7215e5e59fe26
+Subproject commit ed30e030d78a6d647bf4c1ff19b1b50c627417f0

tests/Makefile

@@ -11,7 +11,7 @@ include ../Makefile.base.mk
 # ---------------------------------------------------------------------------------------------------------------------
 
 BUILD_C_FLAGS   += $(DGL_FLAGS) -I..
-BUILD_CXX_FLAGS += $(DGL_FLAGS) -I.. -I../dgl/src/pugl-upstream/include -DDONT_SET_USING_DGL_NAMESPACE
+BUILD_CXX_FLAGS += $(DGL_FLAGS) -I.. -I../dgl -I../dgl/src/pugl-upstream/include -DDONT_SET_USING_DGL_NAMESPACE
 LINK_FLAGS      += -lpthread
 
 # TODO fix within pugl