Some progress

cmake/targets/saturn.cmake

@@ -0,0 +1,106 @@
+# Copyright (c) 2026 Dominic Masters
+#
+# This software is released under the MIT License.
+# https://opensource.org/licenses/MIT
+
+# Resolve YAUL_INSTALL_ROOT (already set by the toolchain file, but guard
+# in case cmake/targets/ is loaded standalone for IDE tooling).
+if(NOT DEFINED YAUL_INSTALL_ROOT)
+  if(DEFINED ENV{YAUL_INSTALL_ROOT})
+    set(YAUL_INSTALL_ROOT "$ENV{YAUL_INSTALL_ROOT}")
+  else()
+    set(YAUL_INSTALL_ROOT "/opt/yaul")
+  endif()
+endif()
+
+# Yaul installs headers/libs under the arch-prefix sysroot subdirectory:
+#   ${YAUL_INSTALL_ROOT}/sh2eb-elf/include/
+#   ${YAUL_INSTALL_ROOT}/sh2eb-elf/lib/
+# Cross-compiled zlib and libzip are installed to the same sysroot.
+set(_YAUL_SYSROOT "${YAUL_INSTALL_ROOT}/sh2eb-elf")
+set(_YAUL_BIN     "${YAUL_INSTALL_ROOT}/bin")
+
+# ---------------------------------------------------------------------------
+# Bypass system find_package calls for libraries we cross-compile into the
+# sh2eb-elf sysroot and install into ${_YAUL_SYSROOT}.
+# ---------------------------------------------------------------------------
+
+# zlib
+if(NOT TARGET ZLIB::ZLIB)
+  add_library(ZLIB::ZLIB INTERFACE IMPORTED GLOBAL)
+  set_target_properties(ZLIB::ZLIB PROPERTIES
+    INTERFACE_INCLUDE_DIRECTORIES "${_YAUL_SYSROOT}/include"
+    INTERFACE_LINK_LIBRARIES      "${_YAUL_SYSROOT}/lib/libz.a"
+  )
+endif()
+set(ZLIB_FOUND         TRUE CACHE BOOL "" FORCE)
+set(ZLIB_INCLUDE_DIR   "${_YAUL_SYSROOT}/include" CACHE PATH "" FORCE)
+set(ZLIB_LIBRARY       "${_YAUL_SYSROOT}/lib/libz.a" CACHE FILEPATH "" FORCE)
+
+# libzip — pre-installed into the sh2eb-elf sysroot; skip Findlibzip.cmake.
+set(libzip_FOUND TRUE CACHE BOOL "libzip found (Saturn sysroot)" FORCE)
+find_path(_sat_zip_inc NAMES zip.h
+  PATHS "${_YAUL_SYSROOT}/include"
+  NO_DEFAULT_PATH
+)
+if(_sat_zip_inc)
+  target_include_directories(${DUSK_LIBRARY_TARGET_NAME} PRIVATE "${_sat_zip_inc}")
+endif()
+
+# ---------------------------------------------------------------------------
+# Compile definitions
+# ---------------------------------------------------------------------------
+target_compile_definitions(${DUSK_LIBRARY_TARGET_NAME} PUBLIC
+  DUSK_SATURN
+  DUSK_INPUT_GAMEPAD
+  DUSK_PLATFORM_ENDIAN_BIG
+  DUSK_DISPLAY_WIDTH=320
+  DUSK_DISPLAY_HEIGHT=224
+  DUSK_THREAD_NONE
+)
+
+# ---------------------------------------------------------------------------
+# Compile options
+# ---------------------------------------------------------------------------
+target_compile_options(${DUSK_LIBRARY_TARGET_NAME} PRIVATE
+  -m2 -mb
+  -fno-builtin
+  -fomit-frame-pointer
+  -w
+)
+
+# ---------------------------------------------------------------------------
+# Include paths
+# ---------------------------------------------------------------------------
+target_include_directories(${DUSK_LIBRARY_TARGET_NAME} PRIVATE
+  "${_YAUL_SYSROOT}/include"
+  "${_YAUL_SYSROOT}/include/yaul"
+)
+
+# ---------------------------------------------------------------------------
+# Link libraries
+# ---------------------------------------------------------------------------
+target_link_directories(${DUSK_LIBRARY_TARGET_NAME} PRIVATE
+  "${_YAUL_SYSROOT}/lib"
+)
+
+target_link_libraries(${DUSK_LIBRARY_TARGET_NAME} PRIVATE
+  "${_YAUL_SYSROOT}/lib/libyaul.a"
+  "${_YAUL_SYSROOT}/lib/libzip.a"
+  "${_YAUL_SYSROOT}/lib/libz.a"
+  m
+)
+
+# ---------------------------------------------------------------------------
+# Post-build: ELF → binary image
+# sh2eb-elf-objcopy converts the ELF to a flat binary that IP.BIN loads
+# into Saturn Work RAM.
+# ---------------------------------------------------------------------------
+set(DUSK_SAT_BIN "${CMAKE_BINARY_DIR}/Dusk.bin")
+add_custom_command(TARGET ${DUSK_BINARY_TARGET_NAME} POST_BUILD
+  COMMAND "${_YAUL_BIN}/sh2eb-elf-objcopy"
+          -O binary
+          "$<TARGET_FILE:${DUSK_BINARY_TARGET_NAME}>"
+          "${DUSK_SAT_BIN}"
+  COMMENT "Converting ${DUSK_BINARY_TARGET_NAME} ELF → ${DUSK_SAT_BIN}"
+)