Fix Mesa source pin and fetch tag validation

Author: AnastaZIuk

CMakeLists.txt

@@ -30,9 +30,12 @@ set(WASM_BUILD_DIR "${WEBVULKAN_BUILD_DIR}/wasm" CACHE PATH "WASM sub-build dire
 set(WEBVULKAN_EMSCRIPTEN_TOOLCHAIN_FILE "${PROJECT_SOURCE_DIR}/cmake/toolchains/WebVulkanEmscripten.cmake" CACHE FILEPATH "Custom Emscripten toolchain file")
 set(MESA_SRC_DIR "${WEBVULKAN_THIRDPARTY_DIR}/mesa" CACHE PATH "Path where Mesa is cloned")
 set(MESA_GIT_URL "https://github.com/Devsh-Graphics-Programming/mesa.git" CACHE STRING "Mesa git repository URL")
-set(MESA_GIT_REF "caeeea677046411288c1a5155d81b27640aedd3a" CACHE STRING "Pinned Mesa git ref")
+set(MESA_GIT_REF "6da627eb8033ac32cd894a1fe659e11db733a265" CACHE STRING "Pinned Mesa git ref")
 if(MESA_GIT_REF STREQUAL "fc73e2257d9c2b51f64c78eaaafe878a73951eb8")
-  set(MESA_GIT_REF "caeeea677046411288c1a5155d81b27640aedd3a" CACHE STRING "Pinned Mesa git ref" FORCE)
+  set(MESA_GIT_REF "6da627eb8033ac32cd894a1fe659e11db733a265" CACHE STRING "Pinned Mesa git ref" FORCE)
+endif()
+if(MESA_GIT_REF STREQUAL "caeeea677046411288c1a5155d81b27640aedd3a")
+  set(MESA_GIT_REF "6da627eb8033ac32cd894a1fe659e11db733a265" CACHE STRING "Pinned Mesa git ref" FORCE)
 endif()
 set(MESA_WASM_BUILD_DIR "${WEBVULKAN_BUILD_DIR}/mesa-wasm" CACHE PATH "Mesa WASM build directory")
 set(LLVM_SRC_DIR "${WEBVULKAN_THIRDPARTY_DIR}/llvm-project" CACHE PATH "Path where llvm-project is cloned")

cmake/FetchWebVulkanSources.cmake

@@ -79,17 +79,17 @@ function(webvulkan_fetch_git_source NAME)
   set(_should_fetch ON)
   if(EXISTS "${FETCH_SOURCE_DIR}/.git")
     set(_should_fetch OFF)
+    _webvulkan_git_source_matches_tag("${FETCH_SOURCE_DIR}" "${FETCH_TAG}" _matches_tag)
+    if(NOT _matches_tag)
+      set(_should_fetch ON)
+    endif()
+
     if(EXISTS "${_state_file}")
       file(READ "${_state_file}" _state_content)
       string(STRIP "${_state_content}" _state_content)
       if(NOT _state_content STREQUAL _state_key)
         set(_should_fetch ON)
       endif()
-    else()
-      _webvulkan_git_source_matches_tag("${FETCH_SOURCE_DIR}" "${FETCH_TAG}" _matches_tag)
-      if(NOT _matches_tag)
-        set(_should_fetch ON)
-      endif()
     endif()
   elseif(EXISTS "${FETCH_SOURCE_DIR}")
     message(FATAL_ERROR "Source directory exists but is not a git checkout: ${FETCH_SOURCE_DIR}")