Began work on the C port. To my knowledge, everything is working except the graphics code. The C API doesn't include bitmap compositing functions out-of-the-box.

playdate/matrix_c/CMakeLists.txt

@@ -0,0 +1,43 @@
+cmake_minimum_required(VERSION 3.14)
+set(CMAKE_C_STANDARD 11)
+
+set(ENVSDK $ENV{PLAYDATE_SDK_PATH})
+
+if (NOT ${ENVSDK} STREQUAL "")
+	# Convert path from Windows
+	file(TO_CMAKE_PATH ${ENVSDK} SDK)
+else()
+	execute_process(
+			COMMAND bash -c "egrep '^\\s*SDKRoot' $HOME/.Playdate/config"
+			COMMAND head -n 1
+			COMMAND cut -c9-
+			OUTPUT_VARIABLE SDK
+			OUTPUT_STRIP_TRAILING_WHITESPACE
+	)
+endif()
+
+if (NOT EXISTS ${SDK})
+	message(FATAL_ERROR "SDK Path not found; set ENV value PLAYDATE_SDK_PATH")
+	return()
+endif()
+
+set(CMAKE_CONFIGURATION_TYPES "Debug;Release")
+set(CMAKE_XCODE_GENERATE_SCHEME TRUE)
+
+# Game Name Customization
+set(PLAYDATE_GAME_NAME ThePlaytrix)
+set(PLAYDATE_GAME_DEVICE ThePlaytrix_DEVICE)
+
+project(${PLAYDATE_GAME_NAME} C ASM)
+
+file(GLOB IMAGES
+	"Source/images/*"
+)
+
+if (TOOLCHAIN STREQUAL "armgcc")
+	add_executable(${PLAYDATE_GAME_DEVICE} ${SDK}/C_API/buildsupport/setup.c main.c)
+else()
+	add_library(${PLAYDATE_GAME_NAME} SHARED main.c ${IMAGES})
+endif()
+
+include(${SDK}/C_API/buildsupport/playdate_game.cmake)