diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..45739bd
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,16 @@
+*.d
+*.o
+*.a
+*.lib
+*.dll
+*.so
+*.so.*
+*.dylib
+*.exe
+*.out
+*.dSYM/
+*.su
+*.idb
+*.pdb
+obj/
+bin/
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..a479491
--- /dev/null
+++ b/README.md
@@ -0,0 +1,4 @@
+# scaffold 
+
+A game engine template built on skele and stk.
+
diff --git a/bmake.mk b/bmake.mk
new file mode 100644
index 0000000..24f9245
--- /dev/null
+++ b/bmake.mk
@@ -0,0 +1,139 @@
+.include "config.mk"
+
+GL_LIB       = -lGL
+LDFLAGS_PLAT = -L/usr/local/lib
+CFLAGS_PLAT  = -I/usr/local/include
+SKELE_INC    =
+SKELE_LIB    =
+
+CLIENT_BIN   = ${GAME_NAME}_client
+GLCLIENT_BIN = ${GAME_NAME}_glclient
+SERVER_BIN   = ${GAME_NAME}_server
+
+.if ${LINK_TYPE:Ustatic} == "dynamic"
+LINK_SKELE    = -lskele
+LINK_GLSKELE  = -lglskele
+LINK_SKELESRV = -lskeleserver
+LINK_STK      = -lstk
+.else
+LINK_SKELE    = -Wl,-Bstatic -lskele    -Wl,-Bdynamic
+LINK_GLSKELE  = -Wl,-Bstatic -lglskele  -Wl,-Bdynamic
+LINK_SKELESRV = -Wl,-Bstatic -lskeleserver -Wl,-Bdynamic
+LINK_STK      = -Wl,-Bstatic -lstk      -Wl,-Bdynamic
+.endif
+
+CFLAGS_BASE = -Wall -Wpedantic -I${.CURDIR}/${INC_DIR} ${SKELE_INC} \
+              -std=c99 ${CFLAGS_PLAT} ${DEBUG_FLAGS}
+
+SOFT_CLIENT_SRCS = src/client/main.c
+GL_CLIENT_SRCS   = src/gl_client/main.c
+SERVER_SRCS      = src/server/main.c
+
+ALL_SOFT_SRCS   = ${GAME_SRCS} ${SOFT_CLIENT_SRCS}
+ALL_GL_SRCS     = ${GAME_SRCS} ${GL_CLIENT_SRCS}
+ALL_SERVER_SRCS = ${GAME_SRCS} ${SERVER_SRCS}
+
+SOFT_DEBUG_OBJS   = ${ALL_SOFT_SRCS:S/.c$/.o/:S/^/${.CURDIR}\/obj\/debug\/soft\//}
+GL_DEBUG_OBJS     = ${ALL_GL_SRCS:S/.c$/.o/:S/^/${.CURDIR}\/obj\/debug\/gl\//}
+SERVER_DEBUG_OBJS = ${ALL_SERVER_SRCS:S/.c$/.o/:S/^/${.CURDIR}\/obj\/debug\/server\//}
+
+SOFT_RELEASE_OBJS   = ${ALL_SOFT_SRCS:S/.c$/.o/:S/^/${.CURDIR}\/obj\/release\/soft\//}
+GL_RELEASE_OBJS     = ${ALL_GL_SRCS:S/.c$/.o/:S/^/${.CURDIR}\/obj\/release\/gl\//}
+SERVER_RELEASE_OBJS = ${ALL_SERVER_SRCS:S/.c$/.o/:S/^/${.CURDIR}\/obj\/release\/server\//}
+
+PREFIX   ?= /usr/local
+MODE     ?= debug
+
+.PHONY: all debug release client glclient server install uninstall clean run run_gl
+
+all: debug
+
+debug:   ${.CURDIR}/${BIN_DIR}/debug/${CLIENT_BIN} \
+         ${.CURDIR}/${BIN_DIR}/debug/${GLCLIENT_BIN} \
+         ${.CURDIR}/${BIN_DIR}/debug/${SERVER_BIN}
+
+release: ${.CURDIR}/${BIN_DIR}/release/${CLIENT_BIN} \
+         ${.CURDIR}/${BIN_DIR}/release/${GLCLIENT_BIN} \
+         ${.CURDIR}/${BIN_DIR}/release/${SERVER_BIN}
+
+client:   ${.CURDIR}/${BIN_DIR}/debug/${CLIENT_BIN}
+glclient: ${.CURDIR}/${BIN_DIR}/debug/${GLCLIENT_BIN}
+server:   ${.CURDIR}/${BIN_DIR}/debug/${SERVER_BIN}
+
+run:    client
+	${.CURDIR}/${BIN_DIR}/debug/${CLIENT_BIN}
+
+run_gl: glclient
+	${.CURDIR}/${BIN_DIR}/debug/${GLCLIENT_BIN}
+
+${.CURDIR}/${BIN_DIR}/debug/${CLIENT_BIN}: ${SOFT_DEBUG_OBJS}
+	@mkdir -p ${.TARGET:H}
+	${CC} -o ${.TARGET} ${.ALLSRC} ${SKELE_LIB} ${LINK_SKELE} ${LINK_STK} -lSDL3 ${LDFLAGS_PLAT}
+
+${.CURDIR}/${BIN_DIR}/debug/${GLCLIENT_BIN}: ${GL_DEBUG_OBJS}
+	@mkdir -p ${.TARGET:H}
+	${CC} -o ${.TARGET} ${.ALLSRC} ${SKELE_LIB} ${LINK_GLSKELE} ${LINK_STK} -lSDL3 ${GL_LIB} ${LDFLAGS_PLAT}
+
+${.CURDIR}/${BIN_DIR}/debug/${SERVER_BIN}: ${SERVER_DEBUG_OBJS}
+	@mkdir -p ${.TARGET:H}
+	${CC} -o ${.TARGET} ${.ALLSRC} ${SKELE_LIB} ${LINK_SKELESRV} ${LINK_STK} ${LDFLAGS_PLAT}
+
+${.CURDIR}/${BIN_DIR}/release/${CLIENT_BIN}: ${SOFT_RELEASE_OBJS}
+	@mkdir -p ${.TARGET:H}
+	${CC} -s -o ${.TARGET} ${.ALLSRC} ${SKELE_LIB} ${LINK_SKELE} ${LINK_STK} -lSDL3 ${LDFLAGS_PLAT}
+
+${.CURDIR}/${BIN_DIR}/release/${GLCLIENT_BIN}: ${GL_RELEASE_OBJS}
+	@mkdir -p ${.TARGET:H}
+	${CC} -s -o ${.TARGET} ${.ALLSRC} ${SKELE_LIB} ${LINK_GLSKELE} ${LINK_STK} -lSDL3 ${GL_LIB} ${LDFLAGS_PLAT}
+
+${.CURDIR}/${BIN_DIR}/release/${SERVER_BIN}: ${SERVER_RELEASE_OBJS}
+	@mkdir -p ${.TARGET:H}
+	${CC} -s -o ${.TARGET} ${.ALLSRC} ${SKELE_LIB} ${LINK_SKELESRV} ${LINK_STK} ${LDFLAGS_PLAT}
+
+.for _src in ${ALL_SOFT_SRCS}
+${.CURDIR}/obj/debug/soft/${_src:S/.c$/.o/}: ${_src}
+	@mkdir -p ${.TARGET:H}
+	${CC} ${CFLAGS_BASE} -g -O0 -MMD -MP -MT ${.TARGET} -MF ${.TARGET:S/.o$/.d/} -c ${.ALLSRC} -o ${.TARGET}
+${.CURDIR}/obj/release/soft/${_src:S/.c$/.o/}: ${_src}
+	@mkdir -p ${.TARGET:H}
+	${CC} ${CFLAGS_BASE} -O2 -MMD -MP -MT ${.TARGET} -MF ${.TARGET:S/.o$/.d/} -c ${.ALLSRC} -o ${.TARGET}
+.endfor
+
+.for _src in ${ALL_GL_SRCS}
+${.CURDIR}/obj/debug/gl/${_src:S/.c$/.o/}: ${_src}
+	@mkdir -p ${.TARGET:H}
+	${CC} ${CFLAGS_BASE} -g -O0 -MMD -MP -MT ${.TARGET} -MF ${.TARGET:S/.o$/.d/} -c ${.ALLSRC} -o ${.TARGET}
+${.CURDIR}/obj/release/gl/${_src:S/.c$/.o/}: ${_src}
+	@mkdir -p ${.TARGET:H}
+	${CC} ${CFLAGS_BASE} -O2 -MMD -MP -MT ${.TARGET} -MF ${.TARGET:S/.o$/.d/} -c ${.ALLSRC} -o ${.TARGET}
+.endfor
+
+.for _src in ${ALL_SERVER_SRCS}
+${.CURDIR}/obj/debug/server/${_src:S/.c$/.o/}: ${_src}
+	@mkdir -p ${.TARGET:H}
+	${CC} ${CFLAGS_BASE} -g -O0 -MMD -MP -MT ${.TARGET} -MF ${.TARGET:S/.o$/.d/} -c ${.ALLSRC} -o ${.TARGET}
+${.CURDIR}/obj/release/server/${_src:S/.c$/.o/}: ${_src}
+	@mkdir -p ${.TARGET:H}
+	${CC} ${CFLAGS_BASE} -O2 -MMD -MP -MT ${.TARGET} -MF ${.TARGET:S/.o$/.d/} -c ${.ALLSRC} -o ${.TARGET}
+.endfor
+
+.-include "obj/debug/soft/*.d"
+.-include "obj/debug/gl/*.d"
+.-include "obj/debug/server/*.d"
+.-include "obj/release/soft/*.d"
+.-include "obj/release/gl/*.d"
+.-include "obj/release/server/*.d"
+
+install:
+	install -d ${PREFIX}/bin
+	install -m 755 ${.CURDIR}/${BIN_DIR}/release/${CLIENT_BIN}   ${PREFIX}/bin/${CLIENT_BIN}
+	install -m 755 ${.CURDIR}/${BIN_DIR}/release/${GLCLIENT_BIN} ${PREFIX}/bin/${GLCLIENT_BIN}
+	install -m 755 ${.CURDIR}/${BIN_DIR}/release/${SERVER_BIN}   ${PREFIX}/bin/${SERVER_BIN}
+
+uninstall:
+	rm -f ${PREFIX}/bin/${CLIENT_BIN}
+	rm -f ${PREFIX}/bin/${GLCLIENT_BIN}
+	rm -f ${PREFIX}/bin/${SERVER_BIN}
+
+clean:
+	rm -rf ${.CURDIR}/${OBJ_DIR} ${.CURDIR}/${BIN_DIR}
diff --git a/build.bat b/build.bat
new file mode 100644
index 0000000..3384c4a
--- /dev/null
+++ b/build.bat
@@ -0,0 +1,16 @@
+@echo off
+if "%1"=="run" (
+	if "%2"=="" (
+		make -f gmake.mk run MODE=debug
+	) else (
+		make -f gmake.mk run MODE=%2
+	)
+) else if "%1"=="run_gl" (
+	if "%2"=="" (
+		make -f gmake.mk run_gl MODE=debug
+	) else (
+		make -f gmake.mk run_gl MODE=%2
+	)
+) else (
+	make -f gmake.mk %*
+)
diff --git a/build.sh b/build.sh
new file mode 100755
index 0000000..a80e2bb
--- /dev/null
+++ b/build.sh
@@ -0,0 +1,51 @@
+#!/bin/sh
+
+OS=$(uname -s | tr '[:upper:]' '[:lower:]')
+
+if [ "$OS" = "freebsd" ]; then
+	MK_FILE="bmake.mk"
+else
+	MK_FILE="gmake.mk"
+fi
+
+if grep -q "Raspberry Pi 5" /proc/device-tree/model 2>/dev/null; then
+	GL_MAJOR=3
+	GL_MINOR=1
+else
+	GL_MAJOR=3
+	GL_MINOR=3
+fi
+
+HAS_INSTALL=0
+HAS_UNINSTALL=0
+for arg in "$@"; do
+	case "$arg" in
+		install)   HAS_INSTALL=1 ;;
+		uninstall) HAS_UNINSTALL=1 ;;
+	esac
+done
+
+if [ "$HAS_INSTALL" = "1" ] || [ "$HAS_UNINSTALL" = "1" ]; then
+	if [ "$HAS_INSTALL" = "1" ]; then
+		make -f "$MK_FILE" release GL_MAJOR=$GL_MAJOR GL_MINOR=$GL_MINOR
+	fi
+
+	if [ "$(id -u)" = "0" ]; then
+		PRIV=""
+	elif command -v doas > /dev/null 2>&1; then
+		PRIV="doas"
+	elif command -v sudo > /dev/null 2>&1; then
+		PRIV="sudo"
+	else
+		echo "error: install requires root. neither doas nor sudo found." >&2
+		exit 1
+	fi
+
+	$PRIV make -f "$MK_FILE" "$@" GL_MAJOR=$GL_MAJOR GL_MINOR=$GL_MINOR
+elif [ "$1" = "run" ]; then
+	make -f "$MK_FILE" run GL_MAJOR=$GL_MAJOR GL_MINOR=$GL_MINOR
+elif [ "$1" = "run_gl" ]; then
+	make -f "$MK_FILE" run_gl GL_MAJOR=$GL_MAJOR GL_MINOR=$GL_MINOR
+else
+	make -f "$MK_FILE" "$@" GL_MAJOR=$GL_MAJOR GL_MINOR=$GL_MINOR
+fi
diff --git a/compile_flags.txt b/compile_flags.txt
new file mode 100644
index 0000000..4d5589f
--- /dev/null
+++ b/compile_flags.txt
@@ -0,0 +1,6 @@
+-std=c99
+-Wall
+-Wpedantic
+-Iinclude
+-I/usr/include/skele
+-I/usr/local/include/skele
diff --git a/config.mk b/config.mk
new file mode 100644
index 0000000..22643df
--- /dev/null
+++ b/config.mk
@@ -0,0 +1,13 @@
+GAME_NAME = game
+
+SRC_DIR = src
+INC_DIR = include
+OBJ_DIR = obj
+BIN_DIR = bin
+
+LINK_TYPE ?= static
+
+GAME_SRCS = \
+	src/game.c
+
+DEBUG_FLAGS ?=
diff --git a/gmake.mk b/gmake.mk
new file mode 100644
index 0000000..ad1db25
--- /dev/null
+++ b/gmake.mk
@@ -0,0 +1,174 @@
+ifeq ($(OS),Windows_NT)
+	CLOCK_SRC := src/platform/clock/win32.c
+else
+	CLOCK_SRC := src/platform/clock/posix.c
+endif
+
+include config.mk
+
+ifeq ($(OS),Windows_NT)
+	SHELL              := cmd.exe
+	GL_LIB             := -lopengl32
+	LDFLAGS_PLAT       :=
+	CFLAGS_PLAT        :=
+	SKELE_INC          := -I"C:/mingw64/include"
+	SKELE_LIB          := -L"C:/mingw64/lib"
+	CLIENT_BIN         := $(GAME_NAME)_client.exe
+	GLCLIENT_BIN       := $(GAME_NAME)_glclient.exe
+	SERVER_BIN         := $(GAME_NAME)_server.exe
+	MKDIR = if not exist $(subst /,\,$(1)) mkdir $(subst /,\,$(1))
+	RMDIR = if exist $(subst /,\,$(1)) rd /s /q $(subst /,\,$(1))
+else ifeq ($(shell uname),FreeBSD)
+	GL_LIB             := -lGL
+	LDFLAGS_PLAT       := -L/usr/local/lib
+	CFLAGS_PLAT        := -I/usr/local/include
+	SKELE_INC          :=
+	SKELE_LIB          :=
+	CLIENT_BIN         := $(GAME_NAME)_client
+	GLCLIENT_BIN       := $(GAME_NAME)_glclient
+	SERVER_BIN         := $(GAME_NAME)_server
+	MKDIR = mkdir -p $(1)
+	RMDIR = rm -rf $(1)
+else
+	GL_LIB             := -lGL
+	LDFLAGS_PLAT       :=
+	CFLAGS_PLAT        :=
+	SKELE_INC          :=
+	SKELE_LIB          :=
+	CLIENT_BIN         := $(GAME_NAME)_client
+	GLCLIENT_BIN       := $(GAME_NAME)_glclient
+	SERVER_BIN         := $(GAME_NAME)_server
+	MKDIR = mkdir -p $(1)
+	RMDIR = rm -rf $(1)
+endif
+
+# linking
+ifeq ($(LINK_TYPE),dynamic)
+	LINK_SKELE    := -lskele
+	LINK_GLSKELE  := -lglskele
+	LINK_SKELESRV := -lskeleserver
+	LINK_STK      := -lstk
+else
+	LINK_SKELE    := -Wl,-Bstatic -lskele    -Wl,-Bdynamic
+	LINK_GLSKELE  := -Wl,-Bstatic -lglskele  -Wl,-Bdynamic
+	LINK_SKELESRV := -Wl,-Bstatic -lskeleserver -Wl,-Bdynamic
+	LINK_STK      := -Wl,-Bstatic -lstk      -Wl,-Bdynamic
+endif
+
+RELEASE_LDFLAGS := -s
+CFLAGS_BASE     := -Wall -Wpedantic -I$(INC_DIR) -Iskele/include $(SKELE_INC) \
+                   -std=c99 $(CFLAGS_PLAT) $(DEBUG_FLAGS)
+
+SOFT_CLIENT_SRCS := src/client/main.c
+GL_CLIENT_SRCS   := src/gl_client/main.c
+SERVER_SRCS      := src/server/main.c
+
+ALL_SOFT_SRCS    := $(GAME_SRCS) $(SOFT_CLIENT_SRCS)
+ALL_GL_SRCS      := $(GAME_SRCS) $(GL_CLIENT_SRCS)
+ALL_SERVER_SRCS  := $(GAME_SRCS) $(SERVER_SRCS)
+
+SOFT_DEBUG_OBJS   := $(ALL_SOFT_SRCS:%.c=obj/debug/soft/%.o)
+GL_DEBUG_OBJS     := $(ALL_GL_SRCS:%.c=obj/debug/gl/%.o)
+SERVER_DEBUG_OBJS := $(ALL_SERVER_SRCS:%.c=obj/debug/server/%.o)
+
+SOFT_RELEASE_OBJS   := $(ALL_SOFT_SRCS:%.c=obj/release/soft/%.o)
+GL_RELEASE_OBJS     := $(ALL_GL_SRCS:%.c=obj/release/gl/%.o)
+SERVER_RELEASE_OBJS := $(ALL_SERVER_SRCS:%.c=obj/release/server/%.o)
+
+PREFIX ?= /usr
+MODE   ?= debug
+
+.PHONY: all debug release client glclient server \
+        install uninstall clean run run_gl
+
+all: debug
+
+debug: \
+	$(BIN_DIR)/debug/$(CLIENT_BIN) \
+	$(BIN_DIR)/debug/$(GLCLIENT_BIN) \
+	$(BIN_DIR)/debug/$(SERVER_BIN)
+
+release: \
+	$(BIN_DIR)/release/$(CLIENT_BIN) \
+	$(BIN_DIR)/release/$(GLCLIENT_BIN) \
+	$(BIN_DIR)/release/$(SERVER_BIN)
+
+client:   $(BIN_DIR)/debug/$(CLIENT_BIN)
+glclient: $(BIN_DIR)/debug/$(GLCLIENT_BIN)
+server:   $(BIN_DIR)/debug/$(SERVER_BIN)
+
+run: client
+	$(BIN_DIR)/debug/$(CLIENT_BIN)
+
+run_gl: glclient
+	$(BIN_DIR)/debug/$(GLCLIENT_BIN)
+
+$(BIN_DIR)/debug/$(CLIENT_BIN): $(SOFT_DEBUG_OBJS)
+	@$(call MKDIR,$(@D))
+	$(CC) -o $@ $^ $(SKELE_LIB) $(LINK_SKELE) $(LINK_STK) -lSDL3 $(LDFLAGS_PLAT)
+
+$(BIN_DIR)/debug/$(GLCLIENT_BIN): $(GL_DEBUG_OBJS)
+	@$(call MKDIR,$(@D))
+	$(CC) -o $@ $^ $(SKELE_LIB) $(LINK_GLSKELE) $(LINK_STK) -lSDL3 $(GL_LIB) $(LDFLAGS_PLAT)
+
+$(BIN_DIR)/debug/$(SERVER_BIN): $(SERVER_DEBUG_OBJS)
+	@$(call MKDIR,$(@D))
+	$(CC) -o $@ $^ $(SKELE_LIB) $(LINK_SKELESRV) $(LINK_STK) $(LDFLAGS_PLAT)
+
+$(BIN_DIR)/release/$(CLIENT_BIN): $(SOFT_RELEASE_OBJS)
+	@$(call MKDIR,$(@D))
+	$(CC) $(RELEASE_LDFLAGS) -o $@ $^ $(SKELE_LIB) $(LINK_SKELE) $(LINK_STK) -lSDL3 $(LDFLAGS_PLAT)
+
+$(BIN_DIR)/release/$(GLCLIENT_BIN): $(GL_RELEASE_OBJS)
+	@$(call MKDIR,$(@D))
+	$(CC) $(RELEASE_LDFLAGS) -o $@ $^ $(SKELE_LIB) $(LINK_GLSKELE) $(LINK_STK) -lSDL3 $(GL_LIB) $(LDFLAGS_PLAT)
+
+$(BIN_DIR)/release/$(SERVER_BIN): $(SERVER_RELEASE_OBJS)
+	@$(call MKDIR,$(@D))
+	$(CC) $(RELEASE_LDFLAGS) -o $@ $^ $(SKELE_LIB) $(LINK_SKELESRV) $(LINK_STK) $(LDFLAGS_PLAT)
+
+obj/debug/soft/%.o: %.c
+	@$(call MKDIR,$(@D))
+	$(CC) $(CFLAGS_BASE) -g -O0 -MMD -MP -c $< -o $@
+
+obj/debug/gl/%.o: %.c
+	@$(call MKDIR,$(@D))
+	$(CC) $(CFLAGS_BASE) -g -O0 -MMD -MP -c $< -o $@
+
+obj/debug/server/%.o: %.c
+	@$(call MKDIR,$(@D))
+	$(CC) $(CFLAGS_BASE) -g -O0 -MMD -MP -c $< -o $@
+
+obj/release/soft/%.o: %.c
+	@$(call MKDIR,$(@D))
+	$(CC) $(CFLAGS_BASE) -O2 -MMD -MP -c $< -o $@
+
+obj/release/gl/%.o: %.c
+	@$(call MKDIR,$(@D))
+	$(CC) $(CFLAGS_BASE) -O2 -MMD -MP -c $< -o $@
+
+obj/release/server/%.o: %.c
+	@$(call MKDIR,$(@D))
+	$(CC) $(CFLAGS_BASE) -O2 -MMD -MP -c $< -o $@
+
+-include $(wildcard obj/debug/soft/*.d)
+-include $(wildcard obj/debug/gl/*.d)
+-include $(wildcard obj/debug/server/*.d)
+-include $(wildcard obj/release/soft/*.d)
+-include $(wildcard obj/release/gl/*.d)
+-include $(wildcard obj/release/server/*.d)
+
+install:
+	install -d $(PREFIX)/bin
+	install -m 755 $(BIN_DIR)/release/$(CLIENT_BIN)   $(PREFIX)/bin/$(CLIENT_BIN)
+	install -m 755 $(BIN_DIR)/release/$(GLCLIENT_BIN) $(PREFIX)/bin/$(GLCLIENT_BIN)
+	install -m 755 $(BIN_DIR)/release/$(SERVER_BIN)   $(PREFIX)/bin/$(SERVER_BIN)
+
+uninstall:
+	rm -f $(PREFIX)/bin/$(CLIENT_BIN)
+	rm -f $(PREFIX)/bin/$(GLCLIENT_BIN)
+	rm -f $(PREFIX)/bin/$(SERVER_BIN)
+
+clean:
+	@$(call RMDIR,$(OBJ_DIR))
+	@$(call RMDIR,$(BIN_DIR))
diff --git a/include/game.h b/include/game.h
new file mode 100644
index 0000000..5c7a65e
--- /dev/null
+++ b/include/game.h
@@ -0,0 +1,18 @@
+#ifndef GAME_H
+#define GAME_H
+
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+uint8_t game_init(void);
+void game_shutdown(void);
+void game_tick(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* GAME_H */
diff --git a/src/client/main.c b/src/client/main.c
new file mode 100644
index 0000000..83ad5af
--- /dev/null
+++ b/src/client/main.c
@@ -0,0 +1,75 @@
+#include "game.h"
+#include <skele/client/input.h>
+#include <skele/client/video.h>
+#include <skele/clock.h>
+#include <skele/skele.h>
+#include <stk/stk.h>
+
+static uint8_t running = 1;
+
+static void on_signal(void) { running = 0; }
+
+int main(int argc, char *argv[])
+{
+	skele_video_config_t video_cfg;
+	uint64_t last, now, elapsed;
+
+	(void)argc;
+	(void)argv;
+
+	skele_clock_init(on_signal);
+
+	if (skele_stk_setup() != SKELE_INIT_SUCCESS)
+		return 1;
+
+	if (skele_init() != SKELE_INIT_SUCCESS) {
+		skele_stk_teardown();
+		return 1;
+	}
+
+	video_cfg.render_width = SKELE_DEFAULT_RENDER_WIDTH;
+	video_cfg.render_height = SKELE_DEFAULT_RENDER_HEIGHT;
+	video_cfg.window_width = 0;
+	video_cfg.window_height = 0;
+	video_cfg.flags = 0;
+
+	if (skele_video_init(video_cfg) != SKELE_INIT_SUCCESS) {
+		skele_stk_teardown();
+		skele_shutdown();
+		return 1;
+	}
+
+	skele_video_set_title("game");
+
+	if (!game_init()) {
+		skele_video_shutdown();
+		skele_stk_teardown();
+		skele_shutdown();
+		return 1;
+	}
+
+	last = skele_time_ns();
+
+	while (running) {
+		if (!skele_input_poll())
+			break;
+
+		stk_poll();
+
+		now = skele_time_ns();
+		elapsed = now - last;
+
+		if (elapsed >= skele_tick_ns) {
+			game_tick();
+			last = now;
+		}
+
+		skele_video_present();
+	}
+
+	game_shutdown();
+	skele_video_shutdown();
+	skele_stk_teardown();
+	skele_shutdown();
+	return 0;
+}
diff --git a/src/game.c b/src/game.c
new file mode 100644
index 0000000..9db828d
--- /dev/null
+++ b/src/game.c
@@ -0,0 +1,5 @@
+#include "game.h"
+
+uint8_t game_init(void) { return 1; }
+void game_shutdown(void) {}
+void game_tick(void) {}
diff --git a/src/gl_client/main.c b/src/gl_client/main.c
new file mode 100644
index 0000000..83ad5af
--- /dev/null
+++ b/src/gl_client/main.c
@@ -0,0 +1,75 @@
+#include "game.h"
+#include <skele/client/input.h>
+#include <skele/client/video.h>
+#include <skele/clock.h>
+#include <skele/skele.h>
+#include <stk/stk.h>
+
+static uint8_t running = 1;
+
+static void on_signal(void) { running = 0; }
+
+int main(int argc, char *argv[])
+{
+	skele_video_config_t video_cfg;
+	uint64_t last, now, elapsed;
+
+	(void)argc;
+	(void)argv;
+
+	skele_clock_init(on_signal);
+
+	if (skele_stk_setup() != SKELE_INIT_SUCCESS)
+		return 1;
+
+	if (skele_init() != SKELE_INIT_SUCCESS) {
+		skele_stk_teardown();
+		return 1;
+	}
+
+	video_cfg.render_width = SKELE_DEFAULT_RENDER_WIDTH;
+	video_cfg.render_height = SKELE_DEFAULT_RENDER_HEIGHT;
+	video_cfg.window_width = 0;
+	video_cfg.window_height = 0;
+	video_cfg.flags = 0;
+
+	if (skele_video_init(video_cfg) != SKELE_INIT_SUCCESS) {
+		skele_stk_teardown();
+		skele_shutdown();
+		return 1;
+	}
+
+	skele_video_set_title("game");
+
+	if (!game_init()) {
+		skele_video_shutdown();
+		skele_stk_teardown();
+		skele_shutdown();
+		return 1;
+	}
+
+	last = skele_time_ns();
+
+	while (running) {
+		if (!skele_input_poll())
+			break;
+
+		stk_poll();
+
+		now = skele_time_ns();
+		elapsed = now - last;
+
+		if (elapsed >= skele_tick_ns) {
+			game_tick();
+			last = now;
+		}
+
+		skele_video_present();
+	}
+
+	game_shutdown();
+	skele_video_shutdown();
+	skele_stk_teardown();
+	skele_shutdown();
+	return 0;
+}
diff --git a/src/server/main.c b/src/server/main.c
new file mode 100644
index 0000000..0ed2d1c
--- /dev/null
+++ b/src/server/main.c
@@ -0,0 +1,49 @@
+#include "game.h"
+#include <skele/clock.h>
+#include <skele/skele.h>
+#include <stk/stk.h>
+
+static uint8_t running = 1;
+
+static void on_signal(void) { running = 0; }
+
+int main(int argc, char *argv[])
+{
+	uint64_t tick_start;
+	uint64_t elapsed;
+
+	(void)argc;
+	(void)argv;
+
+	skele_clock_init(on_signal);
+
+	if (skele_stk_setup() != SKELE_INIT_SUCCESS)
+		return 1;
+
+	if (skele_init() != SKELE_INIT_SUCCESS) {
+		skele_stk_teardown();
+		return 1;
+	}
+
+	if (!game_init()) {
+		skele_stk_teardown();
+		skele_shutdown();
+		return 1;
+	}
+
+	while (running) {
+		tick_start = skele_time_ns();
+
+		stk_poll();
+		game_tick();
+
+		elapsed = skele_time_ns() - tick_start;
+		if (elapsed < skele_tick_ns)
+			skele_sleep_ns(skele_tick_ns - elapsed);
+	}
+
+	game_shutdown();
+	skele_stk_teardown();
+	skele_shutdown();
+	return 0;
+}