Update shader compilation command to use absolute output path

- Adjust `add_custom_command` in CMake to specify an absolute output path for `slang.spv`.

Author: gpx1000

attachments/CMakeLists.txt

@@ -94,8 +94,7 @@ function (add_slang_shader_target TARGET)
   )
   add_custom_command (
           OUTPUT  ${SHADERS_DIR}/slang.spv
-          COMMAND ${SLANGC_EXECUTABLE} ${SHADER_SOURCES} -target spirv -profile spirv_1_4 -emit-spirv-directly -fvk-use-entrypoint-name ${ENTRY_POINTS} -o slang.spv
-          WORKING_DIRECTORY ${SHADERS_DIR}
+          COMMAND ${SLANGC_EXECUTABLE} ${SHADER_SOURCES} -target spirv -profile spirv_1_4 -emit-spirv-directly -fvk-use-entrypoint-name ${ENTRY_POINTS} -o ${CMAKE_CURRENT_LIST_DIR}/${SHADERS_DIR}/slang.spv
           DEPENDS ${SHADERS_DIR} ${SHADER_SOURCES}
           COMMENT "Compiling Slang Shaders"
           VERBATIM