add shaderc wrap fallback

src/renderer/common/shaderlib/meson.build

@@ -9,15 +9,20 @@ r_shaderlib_libdeps = []
 
 if get_option('shader_transpiler')
     dep_crossc = dependency('crossc', version : '>=1.5.0', required : true, static : static, fallback : ['crossc', 'crossc_dep'])
+    dep_shaderc = dependency('shaderc', required : false, fallback : ['shaderc', 'shaderc_dep'])
 
-    # Thanks, google.
-    # https://github.com/google/shaderc/issues/392
-    if static
-        dep_shaderc = cc.find_library('shaderc_combined', required : true)
-    else
-        dep_shaderc = cc.find_library('shaderc_shared', required : true)
+    if not dep_shaderc.found() and get_option('wrap_mode') != 'forcefallback'
+        # Thanks, google.
+        # https://github.com/google/shaderc/issues/392
+        if static
+            dep_shaderc = cc.find_library('shaderc_combined', required : false)
+        else
+            dep_shaderc = cc.find_library('shaderc_shared', required : false)
+        endif
     endif
 
+    assert(dep_shaderc.found(), 'shaderc is required for the shader transpiler')
+
     r_shaderlib_src += files(
         'lang_spirv.c'
     )

subprojects/.gitignore

@@ -1,10 +1,14 @@
+SPIRV-Headers
+SPIRV-Tools
 crossc
-libzip
-zlib
-libpng
 freetype
+glslang
+libpng
 libwebp
+libzip
+ogg
 sdl2
 sdl2_mixer
-ogg
+shaderc
 vorbis
+zlib

subprojects/SPIRV-Headers.wrap

@@ -0,0 +1,5 @@
+[wrap-git]
+directory=SPIRV-Headers
+url=https://github.com/taisei-project/SPIRV-Headers.git
+push-url=git@github.com:taisei-project/SPIRV-Headers.git
+revision=meson-1.3.7

subprojects/SPIRV-Tools.wrap

@@ -0,0 +1,5 @@
+[wrap-git]
+directory=SPIRV-Tools
+url=https://github.com/taisei-project/SPIRV-Tools.git
+push-url=git@github.com:taisei-project/SPIRV-Tools.git
+revision=meson-2019.1

subprojects/glslang.wrap

@@ -0,0 +1,5 @@
+[wrap-git]
+directory=glslang
+url=https://github.com/taisei-project/glslang.git
+push-url=git@github.com:taisei-project/glslang.git
+revision=meson

subprojects/shaderc.wrap

@@ -0,0 +1,5 @@
+[wrap-git]
+directory=shaderc
+url=https://github.com/taisei-project/shaderc.git
+push-url=git@github.com:taisei-project/shaderc.git
+revision=meson