meson: Allow building dri based EGL without GLX

It should be possible to build EGL without GLX, but the meson build
currently doesn't allow that because it too tightly couples glx and dri.
This patch eases dri and glx apart, so that EGL without GLX can be
built.

CC: Daniel Stone <daniels@collabora.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Dylan Baker <dylan.c.baker@intel.com>

diff --git a/meson.build b/meson.build
index 8a17d7f240afc3bebe64d9c296ad7d571f779532..9950ac93b3b5cddcd60e58a7a2d20408ec779f01 100644 (file)
--- a/meson.build
+++ b/meson.build
@@ -1,4 +1,4 @@
-# Copyright © 2017 Intel Corporation
+# Copyright © 2017-2018 Intel Corporation
 
 # Permission is hereby granted, free of charge, to any person obtaining a copy
 # of this software and associated documentation files (the "Software"), to deal
@@ -29,6 +29,8 @@ project(
   default_options : ['buildtype=debugoptimized', 'c_std=c99', 'cpp_std=c++11']
 )
 
+system_has_kms_drm = ['openbsd', 'netbsd', 'freebsd', 'dragonfly', 'linux'].contains(host_machine.system())
+
 # Arguments for the preprocessor, put these in a separate array from the C and
 # C++ (cpp in meson terminology) arguments since they need to be added to the
 # default arguments for both C and C++.
@@ -172,6 +174,13 @@ if _drivers != ''
   with_gallium_virgl = _split.contains('virgl')
   with_gallium_swr = _split.contains('swr')
   with_gallium = true
+  if system_has_kms_drm
+    _glx = get_option('glx')
+    _egl = get_option('egl')
+    if _glx == 'dri' or _egl == 'true' or (_glx == 'disabled' and _egl != 'false')
+      with_dri = true
+    endif
+  endif
 endif
 
 with_intel_vk = false
@@ -217,8 +226,6 @@ if with_dri_i915 or with_gallium_i915
   dep_libdrm_intel = dependency('libdrm_intel', version : '>= 2.4.75')
 endif
 
-system_has_kms_drm = ['openbsd', 'netbsd', 'freebsd', 'dragonfly', 'linux'].contains(host_machine.system())
-
 if host_machine.system() == 'darwin'
   with_dri_platform = 'apple'
 elif ['windows', 'cygwin'].contains(host_machine.system())
@@ -272,6 +279,7 @@ if with_glx == 'auto'
   elif with_gallium
     # Even when building just gallium drivers the user probably wants dri
     with_glx = 'dri'
+    with_dri = true
   elif with_platform_x11 and with_any_opengl and not with_any_vk
     # The automatic behavior should not be to turn on xlib based glx when
     # building only vulkan drivers
@@ -280,11 +288,6 @@ if with_glx == 'auto'
     with_glx = 'disabled'
   endif
 endif
-if with_glx == 'dri'
-   if with_gallium
-      with_dri = true
-   endif
-endif
 
 if not (with_dri or with_gallium or with_glx == 'xlib' or with_glx == 'gallium-xlib')
   with_gles1 = false
@@ -314,6 +317,8 @@ elif _egl == 'true'
     error('EGL requires shared-glapi')
   elif egl_native_platform == ''
     error('No platforms specified, consider -Dplatforms=drm,x11 at least')
+  elif not ['disabled', 'dri'].contains(with_glx)
+    error('EGL requires dri, but a GLX is being built without dri')
   endif
   with_egl = true
 else
@@ -633,7 +638,7 @@ endif
 
 gl_pkgconfig_c_flags = []
 if with_platform_x11
-  if with_any_vk or (with_glx == 'dri' and with_dri_platform == 'drm')
+  if with_any_vk or with_egl or (with_glx == 'dri' and with_dri_platform == 'drm')
     pre_args += '-DHAVE_X11_PLATFORM'
   endif
   if with_glx == 'xlib' or with_glx == 'gallium-xlib'
@@ -1219,7 +1224,7 @@ if with_platform_x11
     dep_xcb = dependency('xcb')
     dep_x11_xcb = dependency('x11-xcb')
   endif
-  if with_any_vk or (with_glx == 'dri' and with_dri_platform == 'drm')
+  if with_any_vk or with_egl or (with_glx == 'dri' and with_dri_platform == 'drm')
     dep_xcb_dri2 = dependency('xcb-dri2', version : '>= 1.8')
 
     if with_dri3