Merge pull request 'KTX and DDS image file loaders' (#169) from ktx_dds into master

Reviewed-on: https://git.madvoxel.net/OpenVulkano/OpenVulkano/pulls/169
Reviewed-by: Georg Hagen <georg.hagen@madvoxel.com>

3rdParty/CMakeLists.txt

@@ -41,4 +41,6 @@ if(ENABLE_TEST)
     add_subdirectory(catch2)
 endif()
 
-add_subdirectory(tinyusdz)
+add_subdirectory(tinyusdz)
+add_subdirectory(ktx-software)
+add_subdirectory(dds_image)

3rdParty/dds_image/CMakeLists.txt

@@ -0,0 +1,15 @@
+include(FetchContent)
+
+if(NOT DEFINED DDS_IMAGE_REPO)
+    set(DDS_IMAGE_REPO https://github.com/spnda/dds_image.git)
+endif ()
+
+FetchContent_Declare(
+    dds_image
+    EXCLUDE_FROM_ALL
+    GIT_REPOSITORY ${DDS_IMAGE_REPO}
+    GIT_TAG main
+    GIT_SHALLOW TRUE
+)
+
+FetchContent_MakeAvailable(dds_image)

3rdParty/ktx-software/CMakeLists.txt

@@ -0,0 +1,20 @@
+include(FetchContent)
+
+if(NOT DEFINED KTX_REPO)
+    set(KTX_REPO https://github.com/KhronosGroup/KTX-Software.git)
+endif ()
+
+FetchContent_Declare(
+    ktx
+    EXCLUDE_FROM_ALL
+    GIT_REPOSITORY ${KTX_REPO}
+    GIT_TAG v4.3.2
+    GIT_SHALLOW TRUE
+)
+
+set(LIB_TYPE_DEFAULT OFF CACHE BOOL "" FORCE)
+set(BUILD_SHARED_LIBS OFF CACHE BOOL "" FORCE)
+set(BASISU_SUPPORT_SSE OFF CACHE BOOL "" FORCE)
+set(KTX_FEATURE_STATIC_LIBRARY ON CACHE BOOL "" FORCE)
+
+FetchContent_MakeAvailable(ktx)