Fixes for CMake USE_PREBUILT_SHADERS option

CMakeLists.txt

@@ -121,6 +121,8 @@ if(BUILD_DX11 AND WIN32)
         endif()
         set(COMPILED_SHADERS ${CMAKE_CURRENT_BINARY_DIR}/Shaders/Compiled)
         file(MAKE_DIRECTORY ${COMPILED_SHADERS})
+    else()
+        file(TO_CMAKE_PATH ${COMPILED_SHADERS} COMPILED_SHADERS)
     endif()
 
     set(LIBRARY_SOURCES ${LIBRARY_SOURCES}
@@ -246,23 +248,33 @@ endif()
 if(BUILD_SAMPLE AND BUILD_DX11 AND WIN32 AND (NOT WINDOWS_STORE))
   list(APPEND TOOL_EXES ddsview)
 
+  if (NOT COMPILED_DDSVIEW_SHADERS)
+      if (USE_PREBUILT_SHADERS)
+          message(FATAL_ERROR "ERROR: Using prebuilt shaders requires the COMPILED_DDSVIEW_SHADERS variable is set")
+      endif()
+      set(COMPILED_DDSVIEW_SHADERS ${CMAKE_CURRENT_BINARY_DIR}/Shaders/Compiled)
+      file(MAKE_DIRECTORY ${COMPILED_DDSVIEW_SHADERS})
+  else()
+      file(TO_CMAKE_PATH ${COMPILED_DDSVIEW_SHADERS} COMPILED_DDSVIEW_SHADERS)
+  endif()
+
   add_executable(ddsview WIN32
     DDSView/ddsview.cpp
     DDSView/ddsview.rc
-    ${COMPILED_SHADERS}/ddsview_ps1D.inc)
+    ${COMPILED_DDSVIEW_SHADERS}/ddsview_ps1D.inc)
   target_link_libraries(ddsview ${PROJECT_NAME} d3d11.lib)
   source_group(ddsview REGULAR_EXPRESSION DDSView/*.*)
 
-  target_include_directories(ddsview PRIVATE ${COMPILED_SHADERS})
+  target_include_directories(ddsview PRIVATE ${COMPILED_DDSVIEW_SHADERS})
 
   if (NOT USE_PREBUILT_SHADERS)
       add_custom_command(
-            OUTPUT "${COMPILED_SHADERS}/ddsview_ps1D.inc"
+            OUTPUT "${COMPILED_DDSVIEW_SHADERS}/ddsview_ps1D.inc"
             MAIN_DEPENDENCY "${PROJECT_SOURCE_DIR}/DDSView/hlsl.cmd"
             DEPENDS "${PROJECT_SOURCE_DIR}/DDSView/ddsview.fx"
             COMMENT "Generating HLSL shaders for DDSView..."
-            COMMAND set CompileShadersOutput=${COMPILED_SHADERS}
-            COMMAND hlsl.cmd > ${COMPILED_SHADERS}/hlsl.log
+            COMMAND set CompileShadersOutput=${COMPILED_DDSVIEW_SHADERS}
+            COMMAND hlsl.cmd > ${COMPILED_DDSVIEW_SHADERS}/hlsl.log
             WORKING_DIRECTORY "${PROJECT_SOURCE_DIR}/DDSView"
             USES_TERMINAL)
   endif()