meson: introduce option vmware-mks-stats controlling the instrumentations of gallium svga driver

The new boolean option controls the instrumentations of gallium svga driver for mksGuestStats.

Reviewed-by: Roland Scheidegger <sroland@vmware.com>
Reviewed-by: Zack Rusin <zackr@vmware.com>
Reviewed-by: Brian Paul <brianp@vmware.com>
Reviewed-by: Charmaine Lee <charmainel@vmware.com>
(cherry picked from commit 57760b7fe4eeb80acc8d6cd8bf6ec609a11a11dc)
(cherry picked from commit 12aed00f08bd95afd605cab34c833e81a4957dbd)

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/12873>

meson.build

@@ -867,6 +867,13 @@ if _power8 != 'disabled'
   endif
 endif
 
+if get_option('vmware-mks-stats')
+  if not with_gallium_svga
+    error('vmware-mks-stats requires gallium VMware/svga driver.')
+  endif
+  pre_args += '-DVMX86_STATS=1'
+endif
+
 _opencl = get_option('gallium-opencl')
 if _opencl != 'disabled'
   if not with_gallium

meson_options.txt

@@ -524,3 +524,9 @@ option(
   value : '',
   description : 'Enable a custom shader replacement mechanism. Note that enabling this option requires adding/generating a shader_replacement.h file that can be included (see shaderapi.c).'
 )
+option(
+  'vmware-mks-stats',
+  type : 'boolean',
+  value : false,
+  description : 'Build gallium VMware/svga driver with mksGuestStats instrumentation.'
+)