[build] Extract version number from git if available

Logs the version number and game executable name as well.

meson.build

@@ -1,4 +1,4 @@
-project('dxvk', ['c', 'cpp'])
+project('dxvk', ['c', 'cpp'], version : 'v0.61')
 
 cpu_family = target_machine.cpu_family()
 
@@ -35,6 +35,10 @@ glsl_generator = generator(glsl_compiler,
   output    : [ '@BASENAME@.h' ],
   arguments : [ '-V', '--vn', '@BASENAME@', '@INPUT@', '-o', '@OUTPUT@' ])
 
+dxvk_version = vcs_tag(['git', 'describe'],
+  input:  'version.h.in',
+  output: 'version.h')
+
 subdir('src')
 
 enable_tests = get_option('enable_tests')

src/dxvk/dxvk_instance.cpp

@@ -1,3 +1,5 @@
+#include <version.h>
+
 #include "dxvk_instance.h"
 #include "dxvk_openvr.h"
 
@@ -6,6 +8,9 @@
 namespace dxvk {
   
   DxvkInstance::DxvkInstance() {
+    Logger::info(str::format("Game: ", env::getExeName()));
+    Logger::info(str::format("DXVK: ", DXVK_VERSION));
+
     g_vrInstance.initInstanceExtensions();
 
     m_vkl = new vk::LibraryFn();

src/dxvk/meson.build

@@ -92,7 +92,7 @@ dxvk_src = files([
 
 thread_dep = dependency('threads')
 
-dxvk_lib = static_library('dxvk', dxvk_src, glsl_generator.process(dxvk_shaders),
+dxvk_lib = static_library('dxvk', dxvk_src, glsl_generator.process(dxvk_shaders), dxvk_version,
   link_with           : [ util_lib, spirv_lib ],
   dependencies        : [ thread_dep, lib_vulkan ],
   include_directories : [ dxvk_include_path ],

version.h.in

@@ -0,0 +1,3 @@
+#pragma once
+
+#define DXVK_VERSION "@VCS_TAG@"