Add CMake find scripts for nlohmann_json, tinygltf, VulkanHpp, Vulkan-Profiles, and GLM libraries, enabling automated detection and integration of dependencies.

Author: gpx1000

attachments/simple_engine/CMake/FindKTX.cmake

@@ -0,0 +1,106 @@
+# FindKTX.cmake
+#
+# Finds the KTX library
+#
+# This will define the following variables
+#
+#    KTX_FOUND
+#    KTX_INCLUDE_DIRS
+#    KTX_LIBRARIES
+#
+# and the following imported targets
+#
+#    KTX::ktx
+#
+
+# Check if we're on Linux - if so, we'll skip the search and directly use FetchContent
+if(UNIX AND NOT APPLE)
+  # On Linux, we assume KTX is not installed and proceed directly to fetching it
+  set(KTX_FOUND FALSE)
+else()
+  # On non-Linux platforms, try to find KTX using pkg-config first
+  find_package(PkgConfig QUIET)
+  if(PKG_CONFIG_FOUND)
+    pkg_check_modules(PC_KTX QUIET ktx libktx ktx2 libktx2)
+  endif()
+
+  # Try to find KTX using standard find_package
+  find_path(KTX_INCLUDE_DIR
+    NAMES ktx.h
+    PATH_SUFFIXES include ktx KTX ktx2 KTX2
+    HINTS
+      ${PC_KTX_INCLUDEDIR}
+      /usr/include
+      /usr/local/include
+      $ENV{KTX_DIR}/include
+      $ENV{VULKAN_SDK}/include
+      ${CMAKE_SOURCE_DIR}/external/ktx/include
+  )
+
+  find_library(KTX_LIBRARY
+    NAMES ktx ktx2 libktx libktx2
+    PATH_SUFFIXES lib lib64
+    HINTS
+      ${PC_KTX_LIBDIR}
+      /usr/lib
+      /usr/lib64
+      /usr/local/lib
+      /usr/local/lib64
+      $ENV{KTX_DIR}/lib
+      $ENV{VULKAN_SDK}/lib
+      ${CMAKE_SOURCE_DIR}/external/ktx/lib
+  )
+
+  include(FindPackageHandleStandardArgs)
+  find_package_handle_standard_args(KTX
+    REQUIRED_VARS KTX_INCLUDE_DIR KTX_LIBRARY
+    FAIL_MESSAGE ""  # Suppress the error message to allow our fallback
+  )
+
+  # Debug output if KTX is not found (only on non-Linux platforms)
+  if(NOT KTX_FOUND)
+    message(STATUS "KTX include directory search paths: ${PC_KTX_INCLUDEDIR}, /usr/include, /usr/local/include, $ENV{KTX_DIR}/include, $ENV{VULKAN_SDK}/include, ${CMAKE_SOURCE_DIR}/external/ktx/include")
+    message(STATUS "KTX library search paths: ${PC_KTX_LIBDIR}, /usr/lib, /usr/lib64, /usr/local/lib, /usr/local/lib64, $ENV{KTX_DIR}/lib, $ENV{VULKAN_SDK}/lib, ${CMAKE_SOURCE_DIR}/external/ktx/lib")
+  endif()
+endif()
+
+if(KTX_FOUND)
+  set(KTX_INCLUDE_DIRS ${KTX_INCLUDE_DIR})
+  set(KTX_LIBRARIES ${KTX_LIBRARY})
+
+  if(NOT TARGET KTX::ktx)
+    add_library(KTX::ktx UNKNOWN IMPORTED)
+    set_target_properties(KTX::ktx PROPERTIES
+      IMPORTED_LOCATION "${KTX_LIBRARIES}"
+      INTERFACE_INCLUDE_DIRECTORIES "${KTX_INCLUDE_DIRS}"
+    )
+  endif()
+else()
+  # If not found, use FetchContent to download and build
+  include(FetchContent)
+
+  # Only show the message on non-Linux platforms
+  if(NOT (UNIX AND NOT APPLE))
+    message(STATUS "KTX not found, fetching from GitHub...")
+  endif()
+
+  FetchContent_Declare(
+    ktx
+    GIT_REPOSITORY https://github.com/KhronosGroup/KTX-Software.git
+    GIT_TAG v4.3.1  # Use a specific tag for stability
+  )
+
+  # Set options to minimize build time and dependencies
+  set(KTX_FEATURE_TOOLS OFF CACHE BOOL "Build KTX tools" FORCE)
+  set(KTX_FEATURE_DOC OFF CACHE BOOL "Build KTX documentation" FORCE)
+  set(KTX_FEATURE_TESTS OFF CACHE BOOL "Build KTX tests" FORCE)
+
+  FetchContent_MakeAvailable(ktx)
+
+  # Create an alias to match the expected target name
+  if(NOT TARGET KTX::ktx)
+    add_library(KTX::ktx ALIAS ktx)
+  endif()
+
+  set(KTX_FOUND TRUE)
+endif()