util/glsl2spirv: pass path to glslangValidator into the script

This allows users to override the location of glslang using normal meson
mechanisms.

Reviewed-by: Luis Felipe Strano Moraes <luis.strano@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/19449>

meson.build

@@ -685,7 +685,7 @@ if vdpau_drivers_path == ''
   vdpau_drivers_path = join_paths(get_option('libdir'), 'vdpau')
 endif
 
-if with_vulkan_overlay_layer or with_aco_tests or with_amd_vk
+if with_vulkan_overlay_layer or with_aco_tests or with_amd_vk or with_intel_vk
   prog_glslang = find_program('glslangValidator', native : true)
   if run_command(prog_glslang, [ '--quiet', '--version' ], check : false).returncode() == 0
     glslang_quiet = ['--quiet']

src/intel/vulkan/meson.build

@@ -49,6 +49,7 @@ float64_spv_h = custom_target(
   output : 'float64_spv.h',
   command : [
     prog_python, '@INPUT@', '@OUTPUT@',
+    prog_glslang,
     '--create-entry', 'main',
     '--vn', 'float64_spv_source',
     '--glsl-version', '450',

src/util/glsl2spirv.py

@@ -33,6 +33,7 @@ if T.TYPE_CHECKING:
     class Arguments(T.Protocol):
         input: str
         output: str
+        glslang: str
         create_entry: T.Optional[str]
         glsl_ver: T.Optional[str]
         Olib: bool
@@ -45,6 +46,7 @@ def get_args() -> Arguments:
     parser = argparse.ArgumentParser()
     parser.add_argument('input', help="Name of input file.")
     parser.add_argument('output', help="Name of output file.")
+    parser.add_argument('glslang', help="path to glslangValidator")
 
     parser.add_argument("--create-entry",
                         dest="create_entry",
@@ -142,7 +144,7 @@ def process_file(args: Arguments) -> None:
     with open(args.input, "r") as infile:
         copy_file = preprocess_file(args, infile)
 
-    cmd_list = ["glslangValidator"]
+    cmd_list = [args.glslang]
 
     if args.Olib:
         cmd_list.append("--keep-uncalled")