build: Add Meson build files

Meson is a Python-based build system that generates build rules of
Ninja, Visual Studio, and XCode. It's designed to be fast, and have a
small, non-Turing complete language to describe the build process,
tests, and dependencies. It's simpler than CMake, and faster than
autotools.

As a direct comparison in terms of speed, three build and check runs for
libepoxy from a clean Git repository clone yield these results on my
Kabylake Core i7 7500U (nproc=4):

- Autotools (make)
Run #1 (cold)   real: 22.384s, user: 20.011s, sys: 3.689s
Run #2 (warm)   real: 22.429s, user: 20.220s, sys: 3.708s
Run #3 (warm)   real: 22.068s, user: 19.743s, sys: 3.594s

- Meson (ninja)
Run #1 (cold)   real: 5.932s, user:  9.371s, sys: 1.625s
Run #2 (warm)   real: 6.273s, user: 10.066,  sys: 1.740s
Run #3 (warm)   real: 5.796s, user:  9.233s, sys: 1.607s

Which means that Meson and ninja are approximately 4x faster than
autotools.

In terms of simplicity, the autotools build takes six files and a total
of 645 lines; Meson requires 3 files, and 361 lines to achieve the same
result. Additionally, Meson automatically builds in a separate build
directory and does not leave files inside the source directory; and Meson
does not use libtool.

Since Meson is quite new and still actively developed, we're going to
leave the autotools build in place for a while, with the intention of
switching to Meson in the future.

1 files changed, 174 insertions, 0 deletions

diff --git a/test/meson.build b/test/meson.build
new file mode 100644
index 0000000..eaf3952
--- /dev/null
+++ b/test/meson.build
@@ -0,0 +1,174 @@
+has_gles1 = gles1_dep.found()
+has_gles2 = gles2_dep.found()
+build_x11_tests = x11_dep.found()
+
+test_cflags = common_cflags + [
+  '-D_XOPEN_SOURCE',
+  '-D_POSIX_C_SOURCE=200809L',
+]
+
+# Unconditionally built tests
+test('header_guards',
+     executable('header guards', 'headerguards.c',
+                c_args: common_cflags,
+                include_directories: libepoxy_inc))
+test('misc_defines',
+     executable('misc defines', 'miscdefines.c',
+                c_args: common_cflags,
+                include_directories: libepoxy_inc))
+test('khronos_typedefs',
+     executable('khronos typedefs', [
+                  'khronos_typedefs.c',
+                  'khronos_typedefs.h',
+                  'khronos_typedefs_nonepoxy.c',
+                ],
+                c_args: common_cflags,
+                include_directories: libepoxy_inc))
+
+if build_egl and build_x11_tests
+  egl_common_sources = [ 'egl_common.h', 'egl_common.c', ]
+  egl_common_lib = static_library('egl_common',
+                                  sources: egl_common_sources,
+                                  dependencies: libepoxy_dep,
+                                  include_directories: libepoxy_inc,
+                                  c_args: common_cflags,
+                                  install: false)
+
+  egl_tests = [
+    [ 'egl_has_extension_nocontext', [], [ 'egl_has_extension_nocontext.c' ], true, ],
+    [ 'egl_gl', [], [ 'egl_gl.c' ], true, ],
+    [ 'egl_gles1_without_glx', [ '-DGLES_VERSION=1', ], [ 'egl_without_glx.c' ], has_gles1, ],
+    [ 'egl_gles2_without_glx', [ '-DGLES_VERSION=2', ], [ 'egl_without_glx.c' ], has_gles2, ],
+  ]
+
+  foreach test: egl_tests
+    test_name = test[0]
+    test_source = test[2]
+    test_args = test[1]
+    test_run = test[3]
+
+    if test_run
+      test_bin = executable(test_name, test_source,
+                            c_args: test_cflags + test_args,
+                            include_directories: libepoxy_inc,
+                            dependencies: [ libepoxy_dep, x11_dep, egl_dep, dl_dep ],
+                            link_with: egl_common_lib,
+                            link_args: '-rdynamic')
+      test(test_name, test_bin)
+    endif
+  endforeach
+endif
+
+if build_glx
+  glx_common_sources = [ 'glx_common.h', 'glx_common.c', ]
+  glx_common_lib = static_library('glx_common',
+                                  sources: glx_common_sources,
+                                  dependencies: libepoxy_dep,
+                                  include_directories: libepoxy_inc,
+                                  c_args: common_cflags,
+                                  install: false)
+
+  # glx_beginend links directly with the GL library, so we need to check it
+  # separately
+  test('glx_beginend', executable('glx_beginend', 'glx_beginend.c',
+                                  c_args: test_cflags,
+                                  include_directories: libepoxy_inc,
+                                  dependencies: [ libepoxy_dep, x11_dep, gl_dep, dl_dep ],
+                                  link_with: glx_common_lib))
+
+  glx_tests = [
+    [ 'glx_public_api', [ 'glx_public_api.c' ], [], [], true ],
+    [ 'glx_public_api_core', [ 'glx_public_api_core.c' ], [], [], true ],
+    [ 'glx_glxgetprocaddress_nocontext', [ 'glx_glxgetprocaddress_nocontext.c' ], [], [], true ],
+    [ 'glx_has_extension_nocontext', [ 'glx_has_extension_nocontext.c' ], [], [], true ],
+    [ 'glx_static', [ 'glx_static.c' ], [ '-DNEEDS_TO_BE_STATIC'], [ '-static' ], libtype == 'static' ],
+    [ 'glx_shared_znow', [ 'glx_static.c', ], [], [ '-Wl,-z,now' ], has_znow ],
+    [ 'glx_alias_prefer_same_name', [ 'glx_alias_prefer_same_name.c', 'dlwrap.c', 'dlwrap.h' ], [], [ '-rdynamic' ], not build_apple ],
+    [ 'glx_gles2', [ 'glx_gles2.c', 'dlwrap.c', 'dlwrap.h' ], [], [ '-rdynamic' ], not build_apple ],
+  ]
+
+  foreach test: glx_tests
+    test_name = test[0]
+    test_source = test[1]
+    test_c_args = test[2]
+    test_link_args = test[3]
+    test_run = test[4]
+
+    if test_run
+      test_bin = executable(test_name, test_source,
+                            c_args: test_cflags + test_c_args,
+                            include_directories: libepoxy_inc,
+                            dependencies: [ libepoxy_dep, x11_dep, dl_dep ],
+                            link_with: glx_common_lib,
+                            link_args: test_link_args)
+      test(test_name, test_bin)
+    endif
+  endforeach
+
+  if not build_apple
+    # GLX/EGL tests
+    if build_egl
+      glx_egl_sources = [
+        'egl_and_glx_different_pointers.c',
+        'dlwrap.c',
+        'dlwrap.h',
+      ]
+
+      glx_egl_deps = [ libepoxy_dep, x11_dep, dl_dep ]
+      glx_egl_link_flags = [ '-rdynamic' ]
+      glx_egl_link_with = [ glx_common_lib, egl_common_lib ]
+
+      glx_egl_tests = [
+        [ 'egl_and_glx_different_pointers_glx', [ '-DUSE_GLX' ], false ],
+        [ 'egl_and_glx_different_pointers_egl', [ '-DUSE_EGL' ], false ],
+        [ 'egl_and_glx_different_pointers_egl_glx', [ '-DUSE_EGL', '-DUSE_GLX' ], true ],
+      ]
+
+      foreach test: glx_egl_tests
+        test_name = test[0]
+        test_c_args = test[1]
+        test_should_fail = test[2]
+
+        test_bin = executable(test_name, glx_egl_sources,
+                              c_args: common_cflags + test_c_args,
+                              include_directories: libepoxy_inc,
+                              dependencies: glx_egl_deps,
+                              link_with: glx_egl_link_with,
+                              link_args: glx_egl_link_flags)
+        test(test_name, test_bin, should_fail: test_should_fail)
+      endforeach
+    endif
+  endif
+endif
+
+# WGL
+if build_wgl
+  wgl_common_sources = [ 'wgl_common.h', 'wgl_common.c', ]
+  wgl_common_lib = static_library('wgl_common',
+                                  sources: wgl_common_sources,
+                                  dependencies: libepoxy_dep,
+                                  include_directories: libepoxy_inc,
+                                  c_args: common_cflags,
+                                  install: false)
+
+  wgl_tests = [
+    [ 'wgl_core_and_exts', [ 'wgl_core_and_exts.c' ], [], ],
+    [ 'wgl_per_context_funcptrs', [ 'wgl_per_context_funcptrs.c' ], [], ],
+    [ 'wgl_usefontbitmaps', [ 'wgl_usefontbitmaps.c'], [], ],
+    [ 'wgl_usefontbitmaps_unicode', [ 'wgl_usefontbitmaps.c' ], [ '-DUNICODE' ], ],
+  ]
+
+  foreach test: wgl_tests
+    test_name = test[0]
+    test_source = test[1]
+    test_c_args = test[2]
+
+    test_bin = executable(test_name, test_source,
+                          c_args: test_cflags + test_c_args,
+                          include_directories: libepoxy_inc,
+                          dependencies: [ libepoxy_dep ],
+                          link_with: wgl_common_lib)
+
+    test(test_name, test_bin)
+  endforeach
+endif