From 1c7ef2d48fef0b5dcb8b424718ff886cc7b5af7d Mon Sep 17 00:00:00 2001
From: Sandy Carter <bwrsandman@gmail.com>
Date: Fri, 13 Jan 2023 23:22:19 -0500
Subject: [PATCH] Add option to add user script

Useful for packagers like pacman and vcpkg to add custom cmake logic
instead of patching code.
---
 CMakeLists.txt        | 17 +++++++++++++++++
 cmake/Config.cmake.in |  3 +++
 2 files changed, 20 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 004f42a..21aaf69 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -60,6 +60,11 @@ set(BGFX_CONFIG_MAX_TEXTURES "" CACHE STRING "Specify maximum texture count")
 set(BGFX_CONFIG_MAX_TEXTURE_SAMPLERS "" CACHE STRING "Specify maximum texture samplers")
 set(BGFX_CONFIG_MAX_SHADERS "" CACHE STRING "Specify shader count")
 set(BGFX_CONFIG_SORT_KEY_NUM_BITS_PROGRAM "" CACHE STRING "Specify maximum program count as 2^(program bits)")
+set(BGFX_CMAKE_USER_SCRIPT "" CACHE STRING "Path to custom cmake script to include")
+
+if(BGFX_CMAKE_USER_SCRIPT)
+	include(${BGFX_CMAKE_USER_SCRIPT})
+endif()
 
 set_property(CACHE BGFX_LIBRARY_TYPE PROPERTY STRINGS STATIC SHARED)
 
@@ -136,6 +141,15 @@ if(BGFX_INSTALL)
 	# Use variables:
 	#   * TARGETS_EXPORT_NAME
 	#   * PROJECT_NAME
+	#   * BGFX_CMAKE_USER_SCRIPT_PRESENT
+	#   * BGFX_CMAKE_USER_SCRIPT_INSTALL_NAME
+	if(BGFX_CMAKE_USER_SCRIPT STREQUAL "")
+		set(BGFX_CMAKE_USER_SCRIPT_PRESENT OFF)
+		set(BGFX_CMAKE_USER_SCRIPT_INSTALL_NAME "NOT-USED")
+	else()
+		set(BGFX_CMAKE_USER_SCRIPT_PRESENT ON)
+		get_filename_component(BGFX_CMAKE_USER_SCRIPT_INSTALL_NAME ${BGFX_CMAKE_USER_SCRIPT} NAME)
+	endif()
 	configure_package_config_file(
 		"${CMAKE_CURRENT_SOURCE_DIR}/cmake/Config.cmake.in" "${project_config}"
 		INSTALL_DESTINATION "${config_install_dir}"
@@ -188,6 +202,9 @@ if(BGFX_INSTALL)
 	)
 
 	# install tools
+	if(BGFX_CMAKE_USER_SCRIPT)
+		install(FILES ${BGFX_CMAKE_USER_SCRIPT} DESTINATION "${config_install_dir}")
+	endif()
 	install(FILES ${CMAKE_CURRENT_SOURCE_DIR}/cmake/bgfxToolUtils.cmake DESTINATION "${config_install_dir}")
 	if(BGFX_BUILD_TOOLS)
 		if(BGFX_BUILD_TOOLS_BIN2C)
diff --git a/cmake/Config.cmake.in b/cmake/Config.cmake.in
index d1eb0c0..45462bb 100644
--- a/cmake/Config.cmake.in
+++ b/cmake/Config.cmake.in
@@ -1,5 +1,8 @@
 @PACKAGE_INIT@
 
+if(@BGFX_CMAKE_USER_SCRIPT_PRESENT@)
+	include("${CMAKE_CURRENT_LIST_DIR}/@BGFX_CMAKE_USER_SCRIPT_INSTALL_NAME@")
+endif()
 include("${CMAKE_CURRENT_LIST_DIR}/@TARGETS_EXPORT_NAME@.cmake")
 get_target_property(BGFX_INCLUDE_PATH bgfx::bgfx INTERFACE_INCLUDE_DIRECTORIES)
 list(GET BGFX_INCLUDE_PATH 0 BGFX_INCLUDE_PATH_1) # bgfx::bgfx exports include directory twice?