From 5af95aa5d5d89150ffc81c1b3e2a920bce159f84 Mon Sep 17 00:00:00 2001
From: Matt Stevens <matt@handsomematt.co.uk>
Date: Mon, 11 May 2020 03:34:20 +0100
Subject: [PATCH] Set bgfx PROJECT_VERSION from bgfx versioning scheme. (#80)

---
 CMakeLists.txt      |  5 ++++-
 cmake/version.cmake | 37 +++++++++++++++++++++++++++++++++++++
 2 files changed, 41 insertions(+), 1 deletion(-)
 create mode 100644 cmake/version.cmake

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 96b45f5..312f04b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -9,7 +9,10 @@
 # this software. If not, see <http://creativecommons.org/publicdomain/zero/1.0/>.
 
 cmake_minimum_required( VERSION 3.0 )
-project( bgfx )
+project(bgfx)
+
+# sets project version from api ver / git rev
+include( cmake/version.cmake )
 
 set_property( GLOBAL PROPERTY USE_FOLDERS ON )
 set(CMAKE_CXX_STANDARD 14)
diff --git a/cmake/version.cmake b/cmake/version.cmake
new file mode 100644
index 0000000..337be77
--- /dev/null
+++ b/cmake/version.cmake
@@ -0,0 +1,37 @@
+# bgfx versioning scheme:
+# bgfx 1.104.7082
+#      ^ ^^^ ^^^^
+#      | |   +--- Commit number  (https://github.com/bkaradzic/bgfx / git rev-list --count HEAD)
+#      | +------- API version    (from https://github.com/bkaradzic/bgfx/blob/master/scripts/bgfx.idl#L4)
+#      +--------- Major revision (always 1)
+
+# BGFX_API_VERSION generated from https://github.com/bkaradzic/bgfx/blob/master/scripts/bgfx.idl#L4
+# bgfx/src/version.h:
+# BGFX_REV_NUMBER
+# BGFX_REV_SHA1
+
+find_package(Git QUIET)
+
+execute_process(COMMAND "${GIT_EXECUTABLE}" -C bgfx log --pretty=format:'%h' -n 1
+                WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
+                OUTPUT_VARIABLE GIT_REV
+                ERROR_QUIET)
+
+execute_process(COMMAND "${GIT_EXECUTABLE}" -C bgfx rev-list --count HEAD
+                WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
+                OUTPUT_VARIABLE GIT_REV_COUNT
+                ERROR_QUIET)
+
+# read version(100) from bgfx.idl
+file(READ "${CMAKE_SOURCE_DIR}/bgfx/scripts/bgfx.idl" BGFX_IDL)
+string(REGEX MATCH "version\\(([^\)]+)\\)"
+       BGFX_API_VERSION ${BGFX_IDL})
+set(BGFX_API_VERSION ${CMAKE_MATCH_1})
+set(BGFX_REV_NUMBER ${GIT_REV_COUNT})
+set(BGFX_REV ${GIT_REV})
+
+# set project specific versions
+set(PROJECT_VERSION 1.${BGFX_API_VERSION}.${BGFX_REV_NUMBER})
+set(PROJECT_VERSION_MAJOR 1)
+set(PROJECT_VERSION_MINOR ${BGFX_API_VERSION})
+set(PROJECT_VERSION_PATCH ${BGFX_REV_NUMBER})
\ No newline at end of file