meson: build classic osmesa

This builds the classic (non-gallium) osmesa with meson. This has been
tested with the osdemo application from mesa-demos.

v2: - Remove unrelated change
    - Add SELinux dependency to osmesa
Signed-off-by: Dylan Baker <dylanx.c.baker@intel.com>
Reviewed-by: Eric Engestrom <eric.engestrom@imgtec.com>

include/meson.build

@@ -55,7 +55,7 @@ if with_glx != 'disabled'
   install_headers('GL/glx.h', 'GL/glext.h', 'GL/glx_mangle.h', subdir : 'GL')
 endif
 
-if with_osmesa
+if with_osmesa != 'none'
   install_headers('GL/osmesa.h', subdir : 'GL')
 endif
 

meson.build

@@ -46,6 +46,7 @@ with_valgrind = get_option('valgrind')
 with_libunwind = get_option('libunwind')
 with_asm = get_option('asm')
 with_llvm = get_option('llvm')
+with_osmesa = get_option('osmesa')
 if get_option('texture-float')
   pre_args += '-DTEXTURE_FLOAT_ENABLED'
   message('WARNING: Floating-point texture enabled. Please consult docs/patents.txt and your lawyer before building mesa.')
@@ -67,9 +68,6 @@ with_any_opengl = with_opengl or with_gles1 or with_gles2
 # Only build shared_glapi if at least one OpenGL API is enabled
 with_shared_glapi = get_option('shared-glapi') and with_any_opengl
 
-# TODO: these will need options, but at the moment they just control header
-# installs
-with_osmesa = false
 
 # shared-glapi is required if at least two OpenGL APIs are being built
 if not with_shared_glapi
@@ -713,7 +711,22 @@ endif
 
 # TODO: glx provider
 
-# TODO: osmesa provider
+if with_osmesa != 'none'
+  if with_osmesa == 'classic' and not with_dri_swrast
+    error('OSMesa classic requires dri (classic) swrast.')
+  endif
+  osmesa_lib_name = 'OSMesa'
+  osmesa_bits = get_option('osmesa-bits')
+  if osmesa_bits != '8'
+    if with_dri or with_glx != 'disabled'
+      error('OSMesa bits must be 8 if building glx or dir based drivers')
+    endif
+    osmesa_lib_name = osmesa_lib_name + osmesa_bits
+    pre_args += [
+      '-DCHAN_BITS=@0@'.format(osmesa_bits), '-DDEFAULT_SOFTWARE_DEPTH_BITS=31'
+    ]
+  endif
+endif
 
 # TODO: symbol mangling
 
@@ -740,6 +753,7 @@ dep_xext = []
 dep_xdamage = []
 dep_xfixes = []
 dep_x11_xcb = []
+dep_xcb = []
 dep_xcb_glx = []
 dep_xcb_dri2 = []
 dep_xcb_dri3 = []

meson_options.txt

@@ -166,3 +166,17 @@ option(
   value : false,
   description : 'Build an SELinux-aware Mesa'
 )
+option(
+  'osmesa',
+  type : 'combo',
+  value : 'none',
+  choices : ['none', 'classic'],
+  description : 'Build OSmesa.'
+)
+option(
+  'osmesa-bits',
+  type : 'combo',
+  value : '8',
+  choices : ['8', '16', '32'],
+  description : 'Number of channel bits for OSMesa.'
+)

src/mapi/glapi/meson.build

@@ -69,7 +69,7 @@ endif
 libglapi_static = static_library(
   'glapi_static',
   static_glapi_files,
-  include_directories : [inc_mesa, inc_include, inc_src],
+  include_directories : [inc_mesa, inc_include, inc_src, inc_mapi],
   c_args : [c_msvc_compat_args, static_glapi_args],
   dependencies : [dep_thread, dep_selinux],
   build_by_default : false,

src/mesa/drivers/osmesa/meson.build

+# Copyright © 2017 Dylan Baker
+
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+
+osmesa_link_with = []
+
+if with_shared_glapi
+  osmesa_link_with += libglapi
+endif
+
+libosmesa = shared_library(
+  osmesa_lib_name,
+  ['osmesa.c', glapitable_h, glapitemp_h],
+  c_args : c_vis_args,
+  cpp_args : cpp_vis_args,
+  link_args : ld_args_gc_sections,
+  include_directories : [
+    inc_include, inc_src, inc_mapi, inc_mesa, inc_gallium, inc_gallium_aux,
+  ],
+  link_with : [libmesa_classic, libglapi_static, osmesa_link_with],
+  dependencies : [dep_thread, dep_selinux],
+  version : '8.0.0',
+  install : true,
+)
+
+pkg.generate(
+  name : 'osmesa',
+  description : 'Mesa Off-screen Rendering Library',
+  version : '8',
+  libraries : libosmesa,
+  libraries_private : gl_priv_libs,
+)

src/mesa/meson.build

@@ -718,6 +718,9 @@ libmesa_gallium = static_library(
 )
 
 subdir('drivers/dri')
+if with_osmesa == 'classic'
+  subdir('drivers/osmesa')
+endif
 if with_tests
   subdir('main/tests')
 endif

src/meson.build

@@ -48,7 +48,6 @@ subdir('util')
 subdir('mapi/glapi/gen')
 subdir('mapi')
 # TODO: opengl
-# TODO: osmesa
 subdir('compiler')
 subdir('egl/wayland/wayland-drm')
 subdir('vulkan')