Added Fastor as a math backend to detray

core/CMakeLists.txt

@@ -98,6 +98,14 @@ if(DETRAY_VC_SOA_PLUGIN)
     )
 endif()
 
+if(DETRAY_FASTOR_PLUGIN)
+    detray_add_library( detray_core_fastor core_fastor )
+    target_link_libraries(
+        detray_core_fastor
+        INTERFACE detray::core detray::algebra_fastor
+    )
+endif()
+
 # Test the public headers of the detray core libraries.
 if(BUILD_TESTING AND DETRAY_BUILD_TESTING)
     string(

core/include/detray/definitions/algebra.hpp

@@ -17,6 +17,8 @@
 #include "detray/plugins/algebra/vc_aos_definitions.hpp"
 #elif DETRAY_ALGEBRA_VC_SOA
 #include "detray/plugins/algebra/vc_soa_definitions.hpp"
+#elif DETRAY_ALGEBRA_FASTOR
+#include "detray/plugins/algebra/fastor_definitions.hpp"
 #else
 #error "No algebra plugin selected! Please link to one of the algebra plugins."
 #endif

core/include/detray/navigation/navigator.hpp

@@ -739,8 +739,8 @@ class navigator {
             init(track, navigation, cfg, ctx);
             is_init = true;
 
-            // Fresh initialization, reset trust and hearbeat even though we are
-            // on inner portal
+            // Fresh initialization, reset trust and heartbeat even though we
+            // are on inner portal
             navigation.m_trust_level = navigation::trust_level::e_full;
             navigation.m_heartbeat = true;
         }

plugins/algebra/CMakeLists.txt

@@ -25,3 +25,6 @@ endif()
 if(DETRAY_VC_SOA_PLUGIN)
     add_subdirectory(vc_soa)
 endif()
+if(DETRAY_FASTOR_PLUGIN)
+    add_subdirectory(fastor)
+endif()

plugins/algebra/fastor/CMakeLists.txt

@@ -0,0 +1,36 @@
+# Detray library, part of the ACTS project (R&D line)
+#
+# (c) 2025 CERN for the benefit of the ACTS project
+#
+# Mozilla Public License Version 2.0
+
+message(STATUS "Building the 'detray::algebra_fastor' plugin")
+
+# A sanity check.
+if(NOT ALGEBRA_PLUGINS_INCLUDE_FASTOR)
+    message(
+        WARNING
+        "Fastor not available from Algebra Plugins. "
+        "The configuration will likely fail."
+    )
+endif()
+
+# Set up the library.
+detray_add_library( detray_algebra_fastor algebra_fastor
+   "include/detray/plugins/algebra/fastor_definitions.hpp"
+)
+target_link_libraries(
+    detray_algebra_fastor
+    INTERFACE algebra::utils algebra::fastor_fastor vecmem::core
+)
+target_compile_definitions(
+    detray_algebra_fastor
+    INTERFACE
+        DETRAY_CUSTOM_SCALARTYPE=${DETRAY_CUSTOM_SCALARTYPE}
+        DETRAY_ALGEBRA_FASTOR
+)
+
+# Set up tests for the public header(s) of detray::algebra_fastor.
+detray_test_public_headers( detray_algebra_fastor
+   "detray/plugins/algebra/fastor_definitions.hpp"
+)

plugins/algebra/fastor/include/detray/plugins/algebra/fastor_definitions.hpp

@@ -0,0 +1,54 @@
+/** Detray library, part of the ACTS project (R&D line)
+ *
+ * (c) 2023-2025 CERN for the benefit of the ACTS project
+ *
+ * Mozilla Public License Version 2.0
+ */
+
+#pragma once
+
+// Algebra-Plugins include
+#include "algebra/fastor_fastor.hpp"
+
+namespace detray {
+
+/// The plugin definition
+template <algebra::concepts::scalar scalar_t>
+using fastor = algebra::plugin::fastor<scalar_t>;
+
+namespace getter {
+
+using algebra::fastor::storage::block;
+using algebra::fastor::storage::element;
+using algebra::fastor::storage::set_block;
+using algebra::fastor::storage::vector;
+
+}  // namespace getter
+
+namespace vector {
+
+using algebra::fastor::math::cross;
+using algebra::fastor::math::dot;
+using algebra::fastor::math::eta;
+using algebra::fastor::math::norm;
+using algebra::fastor::math::normalize;
+
+using algebra::fastor::math::perp;
+using algebra::fastor::math::phi;
+using algebra::fastor::math::theta;
+
+}  // namespace vector
+
+namespace matrix {
+
+using algebra::fastor::math::determinant;
+using algebra::fastor::math::identity;
+using algebra::fastor::math::inverse;
+using algebra::fastor::math::set_identity;
+using algebra::fastor::math::set_zero;
+using algebra::fastor::math::transpose;
+using algebra::fastor::math::zero;
+
+}  // namespace matrix
+
+}  // namespace detray

tests/benchmarks/cpu/CMakeLists.txt

@@ -125,3 +125,8 @@ if(DETRAY_VC_SOA_PLUGIN)
     # detray_add_soa_benchmark( eigen )
     # detray_add_soa_benchmark( vc_aos )
 endif()
+
+# Build the Fastor benchmark executable.
+if(DETRAY_FASTOR_PLUGIN)
+    detray_add_cpu_benchmark( fastor )
+endif()