xrt: Re-arrange build to avoid unnecessary includes.

Avoid unintentionally including cJSON from the source tree when using system,
etc. This adds granularity to the usage of "external" sources.

src/CMakeLists.txt

@@ -1,9 +1,5 @@
 # Copyright 2019-2020, Collabora, Ltd.
 # SPDX-License-Identifier: BSL-1.0
 
-# "Link" against this interface target if your module
-# uses the files in "external".
-add_library(xrt-external-headers INTERFACE)
-target_include_directories(xrt-external-headers SYSTEM INTERFACE ${CMAKE_CURRENT_SOURCE_DIR}/external)
-
+add_subdirectory(external)
 add_subdirectory(xrt)

src/external/CMakeLists.txt

@@ -0,0 +1,18 @@
+# Copyright 2020, Collabora, Ltd.
+# SPDX-License-Identifier: BSL-1.0
+
+add_library(xrt-external-openxr INTERFACE)
+target_include_directories(xrt-external-openxr INTERFACE ${CMAKE_CURRENT_SOURCE_DIR}/openxr_includes)
+
+add_library(xrt-external-glad INTERFACE)
+target_include_directories(xrt-external-glad INTERFACE ${CMAKE_CURRENT_SOURCE_DIR}/glad)
+
+if(BUILD_WITH_SYSTEM_CJSON)
+    add_library(xrt-external-cjson ALIAS cJSON::cJSON)
+else()
+    add_library(xrt-external-cjson INTERFACE)
+    target_include_directories(xrt-external-cjson INTERFACE ${CMAKE_CURRENT_SOURCE_DIR}/cjson)
+endif()
+
+add_library(xrt-external-flexkalman INTERFACE)
+target_include_directories(xrt-external-flexkalman INTERFACE ${CMAKE_CURRENT_SOURCE_DIR}/flexkalman)

src/external/imgui/imgui/cimgui_sdl.cpp

@@ -1,7 +1,7 @@
-#include "./imgui/imgui.h"
+#include "imgui.h"
 #include "cimgui.h"
 
-#include "./imgui/imgui_internal.h"
+#include "imgui_internal.h"
 
 #include "imgui_impl_sdl.h"
 

src/external/meson.build

@@ -1 +1,8 @@
-external_include = include_directories('.')
+# Copyright 2019-2020, Collabora, Ltd.
+# SPDX-License-Identifier: BSL-1.0
+
+openxr_include = include_directories('openxr_includes')
+cjson_include = include_directories('cjson')
+flexkalman_include = include_directories('flexkalman')
+glad_include = include_directories('glad')
+imgui_include = include_directories('imgui')

src/external/openxr_includes/openxr/loader_interfaces.h

@@ -19,7 +19,7 @@
 
 #pragma once
 
-#include <openxr_includes/openxr.h>
+#include "openxr.h"
 
 #ifdef __cplusplus
 extern "C" {

src/xrt/auxiliary/CMakeLists.txt

@@ -112,11 +112,13 @@ add_library(aux-includes INTERFACE)
 target_include_directories(aux-includes INTERFACE ${CMAKE_CURRENT_SOURCE_DIR})
 target_link_libraries(aux-includes INTERFACE xrt-interfaces)
 
-# OpenGL library.
-add_library(aux_ogl STATIC ${OGL_SOURCE_FILES})
-target_link_libraries(aux_ogl PUBLIC aux-includes)
-# for GLAD
-target_link_libraries(aux_ogl PRIVATE xrt-external-headers)
+if(BUILD_WITH_OPENGL)
+	# OpenGL library.
+	add_library(aux_ogl STATIC ${OGL_SOURCE_FILES})
+	target_link_libraries(aux_ogl PUBLIC aux-includes)
+	# for GLAD
+	target_link_libraries(aux_ogl PUBLIC xrt-external-glad)
+endif()
 
 # OS library.
 add_library(aux_os STATIC ${OS_SOURCE_FILES})
@@ -141,7 +143,6 @@ target_include_directories(aux_math SYSTEM
 # Util library.
 add_library(aux_util STATIC ${UTIL_SOURCE_FILES})
 target_link_libraries(aux_util PUBLIC aux-includes)
-target_link_libraries(aux_util PUBLIC xrt-external-headers)
 # for u_device
 target_link_libraries(aux_util PUBLIC aux_math)
 if(BUILD_WITH_JPEG)
@@ -151,6 +152,8 @@ endif()
 if(BUILD_WITH_SYSTEM_CJSON)
 	target_link_libraries(aux_util PUBLIC cJSON::cJSON)
 	target_compile_definitions(aux_util PRIVATE XRT_USE_SYSTEM_CJSON)
+else()
+	target_link_libraries(aux_util PUBLIC xrt-external-cjson)
 endif()
 
 # Tracking library.
@@ -163,7 +166,7 @@ target_include_directories(aux_tracking SYSTEM
 	${EIGEN3_INCLUDE_DIR}
 	)
 # for flexkalman
-target_link_libraries(aux_tracking PRIVATE xrt-external-headers)
+target_link_libraries(aux_tracking PRIVATE xrt-external-flexkalman)
 if(BUILD_TRACKING)
 	target_include_directories(aux_tracking SYSTEM
 		PRIVATE

src/xrt/auxiliary/meson.build

@@ -42,7 +42,7 @@ lib_aux_util = static_library(
 	),
 	include_directories: [
 		xrt_include,
-		external_include,
+		cjson_include,
 	],
 	dependencies: [
 		xrt_config_have
@@ -63,7 +63,7 @@ lib_aux_ogl = static_library(
 	),
 	include_directories: [
 		xrt_include,
-		external_include,
+		glad_include,
 	],
 )
 
@@ -150,7 +150,7 @@ endif
 lib_aux_tracking = static_library(
 	'aux_tracking',
 	files(tracking_srcs),
-	include_directories: [xrt_include, external_include],
+	include_directories: [xrt_include, flexkalman_include],
 	dependencies: tracking_deps
 )
 
@@ -168,7 +168,6 @@ lib_aux_vk = static_library(
 	),
 	include_directories: [
 		xrt_include,
-		external_include,
 	],
 )
 

src/xrt/compositor/meson.build

@@ -7,6 +7,7 @@ comp_include = include_directories('.')
 
 # TODO: Dependency resolution and subsequent configuration could be improved
 compositor_deps = [aux, shaders, vulkan, xrt_config_vulkan]
+compositor_includes = [xrt_include]
 
 compositor_srcs = [
 	'client/comp_vk_client.c',
@@ -49,6 +50,7 @@ if build_opengl
 		'client/comp_gles_glue.c',
 	]
 	compositor_deps += [opengl]
+	compositor_includes += [glad_include]
 endif
 
 if build_opengl and build_xlib
@@ -114,10 +116,7 @@ endif
 lib_comp = static_library(
 	'comp',
 	compositor_srcs,
-	include_directories: [
-		xrt_include,
-		external_include,
-	],
+	include_directories: compositor_includes,
 	dependencies: compositor_deps,
 	c_args: compile_args,
 	cpp_args: compile_args,

src/xrt/drivers/CMakeLists.txt

@@ -80,7 +80,7 @@ if(BUILD_DRIVER_NS)
 		)
 
 	add_library(drv_ns STATIC ${NS_SOURCE_FILES})
-	target_link_libraries(drv_ns PRIVATE xrt-interfaces aux_math xrt-external-headers)
+	target_link_libraries(drv_ns PRIVATE xrt-interfaces aux_math xrt-external-cjson)
 	list(APPEND ENABLED_HEADSET_DRIVERS ns)
 endif()
 
@@ -146,7 +146,7 @@ if(BUILD_DRIVER_VIVE)
 		)
 
 	add_library(drv_vive STATIC ${VIVE_SOURCE_FILES})
-	target_link_libraries(drv_vive PRIVATE xrt-interfaces aux_os aux_util aux_math)
+	target_link_libraries(drv_vive PRIVATE xrt-interfaces aux_os aux_util aux_math xrt-external-cjson)
 	target_link_libraries(drv_vive PRIVATE ${ZLIB_LIBRARIES})
 	target_include_directories(drv_vive PRIVATE ${ZLIB_INCLUDE_DIRS})
 	list(APPEND ENABLED_HEADSET_DRIVERS vive)

src/xrt/drivers/meson.build

@@ -50,7 +50,10 @@ lib_drv_ns = static_library(
 		'north_star/ns_interface.h',
 		'north_star/ns_prober.c',
 	),
-	include_directories: [xrt_include, external_include],
+	include_directories: [
+		xrt_include,
+		cjson_include,
+	],
 	dependencies: [aux, xrt_config_drivers],
 	build_by_default: 'ns' in drivers,
 )
@@ -126,7 +129,10 @@ lib_drv_vive = static_library(
 		'vive/vive_controller_driver.c',
 		'vive/vive_controller_interface.h'
 	),
-	include_directories: [xrt_include, external_include],
+	include_directories: [
+		xrt_include,
+		cjson_include,
+	],
 	dependencies: [aux, zlib],
 	build_by_default: 'vive' in drivers,
 )

src/xrt/include/xrt/xrt_openxr_includes.h

@@ -33,6 +33,6 @@ typedef __eglMustCastToProperFunctionPointerType (*PFNEGLGETPROCADDRESSPROC)(
 #include <time.h>
 #endif
 
-#include "openxr_includes/openxr.h"
-#include "openxr_includes/openxr_platform.h"
-#include "openxr_includes/loader_interfaces.h"
+#include "openxr/openxr.h"
+#include "openxr/openxr_platform.h"
+#include "openxr/loader_interfaces.h"

src/xrt/state_trackers/CMakeLists.txt

@@ -1,6 +1,8 @@
 # Copyright 2019, Collabora, Ltd.
 # SPDX-License-Identifier: BSL-1.0
 
-add_subdirectory(gui)
+if(BUILD_WITH_OPENGL)
+	add_subdirectory(gui)
+endif()
 add_subdirectory(oxr)
 add_subdirectory(prober)

src/xrt/state_trackers/gui/CMakeLists.txt

@@ -11,21 +11,21 @@ set(GUI_SOURCE_FILES
 	gui_scene_debug.c
 	gui_scene_main_menu.c
 	gui_scene_video.c
-	../../../external/imgui/cimgui.cpp
-	../../../external/imgui_monado/imgui_monado.cpp
-	../../../external/imgui/cimgui.h
-	../../../external/imgui/imconfig.h
-	../../../external/imgui/imgui.cpp
-	../../../external/imgui/imgui.h
-	../../../external/imgui/imgui_demo.cpp
-	../../../external/imgui/imgui_draw.cpp
-	../../../external/imgui/imgui_impl_opengl3.cpp
-	../../../external/imgui/imgui_impl_opengl3.h
-	../../../external/imgui/imgui_internal.h
-	../../../external/imgui/imgui_widgets.cpp
-	../../../external/imgui/imstb_rectpack.h
-	../../../external/imgui/imstb_textedit.h
-	../../../external/imgui/imstb_truetype.h
+	../../../external/imgui/imgui/cimgui.cpp
+	../../../external/imgui/imgui_monado/imgui_monado.cpp
+	../../../external/imgui/imgui/cimgui.h
+	../../../external/imgui/imgui/imconfig.h
+	../../../external/imgui/imgui/imgui.cpp
+	../../../external/imgui/imgui/imgui.h
+	../../../external/imgui/imgui/imgui_demo.cpp
+	../../../external/imgui/imgui/imgui_draw.cpp
+	../../../external/imgui/imgui/imgui_impl_opengl3.cpp
+	../../../external/imgui/imgui/imgui_impl_opengl3.h
+	../../../external/imgui/imgui/imgui_internal.h
+	../../../external/imgui/imgui/imgui_widgets.cpp
+	../../../external/imgui/imgui/imstb_rectpack.h
+	../../../external/imgui/imgui/imstb_textedit.h
+	../../../external/imgui/imgui/imstb_truetype.h
 	)
 
 add_library(st_gui STATIC
@@ -33,24 +33,27 @@ add_library(st_gui STATIC
 	)
 
 target_link_libraries(st_gui PRIVATE
-	xrt-external-headers
+	xrt-external-glad
 	aux_util
 	)
 target_include_directories(st_gui PUBLIC
 	${CMAKE_CURRENT_SOURCE_DIR}/..
+	${CMAKE_CURRENT_SOURCE_DIR}/../../../external/imgui
 	)
 
 if(BUILD_WITH_SDL2)
-	add_library(imgui_impl_sdl STATIC 
-		../../../external/imgui/cimgui_sdl.cpp
-		../../../external/imgui/imgui_impl_sdl.cpp
-		../../../external/imgui/imgui_impl_sdl.h
+	add_library(imgui_impl_sdl STATIC
+		../../../external/imgui/imgui/cimgui_sdl.cpp
+		../../../external/imgui/imgui/imgui_impl_sdl.cpp
+		../../../external/imgui/imgui/imgui_impl_sdl.h
 		)
 	target_link_libraries(imgui_impl_sdl PRIVATE
 		${SDL2_LIBRARIES}
-		xrt-external-headers
 		)
-	target_include_directories(imgui_impl_sdl PRIVATE
+	target_include_directories(imgui_impl_sdl
+		PRIVATE
 		${SDL2_INCLUDE_DIRS}
+		PUBLIC
+		${CMAKE_CURRENT_SOURCE_DIR}/../../../external/imgui
 		)
 endif()

src/xrt/state_trackers/gui/meson.build

@@ -1,4 +1,4 @@
-# Copyright 2019, Collabora, Ltd.
+# Copyright 2019-2020, Collabora, Ltd.
 # SPDX-License-Identifier: BSL-1.0
 
 gui_sources = [
@@ -11,22 +11,22 @@ gui_sources = [
 	'gui_scene_debug.c',
 	'gui_scene_main_menu.c',
 	'gui_scene_video.c',
-	'../../../external/imgui/cimgui.cpp',
-	'../../../external/imgui/cimgui.h',
-	'../../../external/imgui/imconfig.h',
-	'../../../external/imgui/imgui.cpp',
-	'../../../external/imgui/imgui.h',
-	'../../../external/imgui/imgui_demo.cpp',
-	'../../../external/imgui/imgui_draw.cpp',
-	'../../../external/imgui/imgui_impl_opengl3.cpp',
-	'../../../external/imgui/imgui_impl_opengl3.h',
-	'../../../external/imgui/imgui_internal.h',
-	'../../../external/imgui/imgui_widgets.cpp',
-	'../../../external/imgui/imstb_rectpack.h',
-	'../../../external/imgui/imstb_textedit.h',
-	'../../../external/imgui/imstb_truetype.h',
-    '../../../external/imgui_monado/cimgui_monado.h',
-    '../../../external/imgui_monado/imgui_monado.cpp'
+	'../../../external/imgui/imgui/cimgui.cpp',
+	'../../../external/imgui/imgui/cimgui.h',
+	'../../../external/imgui/imgui/imconfig.h',
+	'../../../external/imgui/imgui/imgui.cpp',
+	'../../../external/imgui/imgui/imgui.h',
+	'../../../external/imgui/imgui/imgui_demo.cpp',
+	'../../../external/imgui/imgui/imgui_draw.cpp',
+	'../../../external/imgui/imgui/imgui_impl_opengl3.cpp',
+	'../../../external/imgui/imgui/imgui_impl_opengl3.h',
+	'../../../external/imgui/imgui/imgui_internal.h',
+	'../../../external/imgui/imgui/imgui_widgets.cpp',
+	'../../../external/imgui/imgui/imstb_rectpack.h',
+	'../../../external/imgui/imgui/imstb_textedit.h',
+	'../../../external/imgui/imgui/imstb_truetype.h',
+	'../../../external/imgui/imgui_monado/cimgui_monado.h',
+	'../../../external/imgui/imgui_monado/imgui_monado.cpp'
 ]
 
 gui_deps = [aux, xrt_config_have]
@@ -36,7 +36,9 @@ lib_st_gui = static_library(
 	files(gui_sources),
 	include_directories: [
 		xrt_include,
-		external_include,
+		glad_include,
+		cjson_include,
+		imgui_include,
 	],
 	dependencies: gui_deps,
 )

src/xrt/state_trackers/oxr/CMakeLists.txt

@@ -52,4 +52,4 @@ if(BUILD_WITH_EGL)
 endif()
 
 add_library(st_oxr STATIC ${OXR_SOURCE_FILES})
-target_link_libraries(st_oxr PRIVATE xrt-interfaces aux_util aux_math Vulkan::Vulkan comp_client)
+target_link_libraries(st_oxr PRIVATE xrt-interfaces xrt-external-openxr aux_util aux_math Vulkan::Vulkan comp_client)

src/xrt/state_trackers/oxr/meson.build

@@ -1,4 +1,4 @@
-# Copyright 2019, Collabora, Ltd.
+# Copyright 2019-2020, Collabora, Ltd.
 # SPDX-License-Identifier: BSL-1.0
 
 compile_args = []
@@ -53,7 +53,7 @@ lib_st_oxr = static_library(
 	),
 	include_directories: [
 		xrt_include,
-		external_include,
+		openxr_include,
 	],
 	dependencies: [aux, vulkan],
 	c_args: compile_args,

src/xrt/state_trackers/oxr/oxr_api_instance.c

@@ -24,8 +24,8 @@
 #include "oxr_api_verify.h"
 #include "oxr_extension_support.h"
 
-#include "openxr_includes/openxr.h"
-#include "openxr_includes/openxr_reflection.h"
+#include "openxr/openxr.h"
+#include "openxr/openxr_reflection.h"
 
 #define MAKE_EXTENSION_PROPERTIES(mixed_case, all_caps)                        \
 	{XR_TYPE_EXTENSION_PROPERTIES, NULL, XR_##all_caps##_EXTENSION_NAME,   \

src/xrt/state_trackers/oxr/oxr_logger.c

@@ -17,7 +17,7 @@
 #include "oxr_objects.h"
 #include "oxr_logger.h"
 
-#include "openxr_includes/openxr_reflection.h"
+#include "openxr/openxr_reflection.h"
 
 
 DEBUG_GET_ONCE_BOOL_OPTION(entrypoints, "OXR_DEBUG_ENTRYPOINTS", false)

src/xrt/state_trackers/prober/meson.build

@@ -1,4 +1,4 @@
-# Copyright 2019, Collabora, Ltd.
+# Copyright 2019-2020, Collabora, Ltd.
 # SPDX-License-Identifier: BSL-1.0
 
 prober_sources = [
@@ -37,7 +37,7 @@ lib_st_prober = static_library(
 	include_directories: [
 		xrt_include,
 		drv_include,
-		external_include,
+		cjson_include,
 	],
 	dependencies: prober_deps,
 )

src/xrt/targets/gui/meson.build

@@ -1,4 +1,4 @@
-# Copyright 2019, Collabora, Ltd.
+# Copyright 2019-2020, Collabora, Ltd.
 # SPDX-License-Identifier: BSL-1.0
 
 gui_deps = [
@@ -20,9 +20,9 @@ gui = executable(
 		'gui_sdl2_imgui.c',
 		'gui_sdl2_main.c',
 		'gui_sdl2_prober.c',
-		'../../../external/imgui/cimgui_sdl.cpp',
-		'../../../external/imgui/imgui_impl_sdl.cpp',
-		'../../../external/imgui/imgui_impl_sdl.h',
+		'../../../external/imgui/imgui/cimgui_sdl.cpp',
+		'../../../external/imgui/imgui/imgui_impl_sdl.cpp',
+		'../../../external/imgui/imgui/imgui_impl_sdl.h',
 	),
 	link_whole: [
 		lib_aux_os,
@@ -36,10 +36,11 @@ gui = executable(
 	include_directories: [
 		aux_include,
 		common_include,
-		external_include,
+		glad_include,
 		st_include,
 		drv_include,
 		xrt_include,
+		imgui_include,
 	],
 	dependencies: gui_deps + driver_deps,
 )

src/xrt/targets/openxr/meson.build

@@ -1,4 +1,4 @@
-# Copyright 2019, Collabora, Ltd.
+# Copyright 2019-2020, Collabora, Ltd.
 # SPDX-License-Identifier: BSL-1.0
 
 ######
@@ -17,24 +17,24 @@ runtime_target = '@0@openxr@1@'.format(runtime_prefix, runtime_suffix)
 xr_api_major = 1
 
 hack_deps = []
-hack_src = []
+hack_src = [ 'oxr_sdl2_hack.c']
 hack_libs = []
-hack_incs = []
+hack_incs = [
+	glad_include,
+	imgui_include,
+]
 
 if sdl2.found()
 	hack_deps += sdl2
 	hack_src += [
-		'oxr_sdl2_hack.c',
-		'../../../external/imgui/cimgui_sdl.cpp',
-		'../../../external/imgui/imgui_impl_sdl.cpp',
-		'../../../external/imgui/imgui_impl_sdl.h',
+		'../../../external/imgui/imgui/cimgui_sdl.cpp',
+		'../../../external/imgui/imgui/imgui_impl_sdl.cpp',
+		'../../../external/imgui/imgui/imgui_impl_sdl.h',
 	]
 	hack_libs += lib_st_gui
 	hack_incs += [
 		st_include,
 	]
-else
-	hack_src += 'oxr_sdl2_hack.c'
 endif
 
 openxr_deps = [
@@ -84,7 +84,7 @@ openxr = library(
 		lib_target_instance,
 	] + driver_libs + hack_libs,
 	include_directories: [
-		external_include,
+		openxr_include,
 		st_include, # Sigh debian meson requires this.
 		aux_include,
 		common_include,