Fix build without opengl

Makefile.plugins.mk

@@ -70,8 +70,9 @@ UI_TYPE = opengl
 endif
 
 ifeq ($(UI_TYPE),cairo)
+DGL_FLAGS += -DDGL_CAIRO
 ifeq ($(HAVE_CAIRO),true)
-DGL_FLAGS += $(CAIRO_FLAGS) -DDGL_CAIRO
+DGL_FLAGS += $(CAIRO_FLAGS)
 DGL_LIBS  += $(CAIRO_LIBS)
 DGL_LIB    = $(DPF_PATH)/build/libdgl-cairo.a
 HAVE_DGL   = true
@@ -81,8 +82,9 @@ endif
 endif
 
 ifeq ($(UI_TYPE),opengl)
+DGL_FLAGS += -DDGL_OPENGL
 ifeq ($(HAVE_OPENGL),true)
-DGL_FLAGS += $(OPENGL_FLAGS) -DDGL_OPENGL
+DGL_FLAGS += $(OPENGL_FLAGS)
 DGL_LIBS  += $(OPENGL_LIBS)
 DGL_LIB    = $(DPF_PATH)/build/libdgl-opengl.a
 HAVE_DGL   = true
@@ -91,6 +93,11 @@ HAVE_DGL   = false
 endif
 endif
 
+ifeq ($(UI_TYPE),external)
+DGL_FLAGS += -DDGL_EXTERNAL
+HAVE_DGL   = true
+endif
+
 DGL_LIBS += $(DGL_SYSTEM_LIBS)
 
 ifneq ($(HAVE_DGL),true)

distrho/src/DistrhoPluginChecks.h

@@ -139,7 +139,12 @@
 // -----------------------------------------------------------------------
 // Disable UI if DGL or External UI is not available
 
-#if DISTRHO_PLUGIN_HAS_UI && ! DISTRHO_PLUGIN_HAS_EXTERNAL_UI && ! defined(HAVE_CAIRO) && ! defined(HAVE_OPENGL)
+#if (defined(DGL_CAIRO) && ! defined(HAVE_CAIRO)) || (defined(DGL_OPENGL) && ! defined(HAVE_OPENGL))
+# undef DISTRHO_PLUGIN_HAS_EMBED_UI
+# define DISTRHO_PLUGIN_HAS_EMBED_UI 0
+#endif
+
+#if DISTRHO_PLUGIN_HAS_UI && ! DISTRHO_PLUGIN_HAS_EMBED_UI && ! DISTRHO_PLUGIN_HAS_EXTERNAL_UI
 # undef DISTRHO_PLUGIN_HAS_UI
 # define DISTRHO_PLUGIN_HAS_UI 0
 #endif

examples/ExternalUI/Makefile

@@ -21,6 +21,7 @@ FILES_UI  = \
 # --------------------------------------------------------------
 # Do some magic
 
+UI_TYPE = external
 include ../../Makefile.plugins.mk
 
 ifneq ($(HAIKU),true)

examples/Info/DistrhoPluginInfo.h

@@ -26,6 +26,7 @@
 #define DISTRHO_PLUGIN_NUM_INPUTS   2
 #define DISTRHO_PLUGIN_NUM_OUTPUTS  2
 #define DISTRHO_PLUGIN_WANT_TIMEPOS 1
+#define DISTRHO_PLUGIN_USES_MODGUI  1
 #define DISTRHO_UI_USER_RESIZABLE   1
 #define DISTRHO_UI_USE_NANOVG       1