Gui implementation

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "gui/imgui"]
+	path = gui/imgui
+	url = git@github.com:ocornut/imgui

Makefile

@@ -34,10 +34,18 @@ LDFLAGS_gui != pkg-config --libs-only-L sdl2
 LDLIBS_gui != pkg-config --libs-only-l sdl2 SDL2_image glew gl glu
 CXXFLAGS_gui += $(shell pkg-config --cflags sdl2)
 
+IMGUI_DIR ?= gui/imgui
+IMGUI_SRC := $(wildcard $(IMGUI_DIR)/*.cpp)
+IMGUI_SRC += $(IMGUI_DIR)/backends/imgui_impl_opengl3.cpp
+IMGUI_SRC += $(IMGUI_DIR)/backends/imgui_impl_sdl2.cpp
+
+IMGUI_INC += $(IMGUI_DIR) $(IMGUI_DIR)/backends
+
 # Used to simplify the nix build
 GUI_ASSET_DIR ?= assets
 
 CXXFLAGS_gui += -DASSET_DIR='"$(GUI_ASSET_DIR)"'
+CXXFLAGS_gui += $(foreach d,$(IMGUI_INC),-iquote $d)
 
 MAKEFLAGS += --no-builtin-rules
 MAKEFLAGS += --no-print-directory
@@ -59,9 +67,14 @@ NAME_gui_debug := debug_gui
 NAME_gui_tests := tests_gui
 
 EXTRA_SRC_gui_tests != find tests/gui -name "*.cpp"
-
 EXTRA_SRC_server_tests != find tests/server -type f -name "*.c"
 
+SRC_gui != find gui -type f -name "*.cpp" -not -path "gui/imgui/*"
+SRC_gui += $(IMGUI_SRC)
+
+SRC_server != find server -type f -name "*.c"
+
+
 # call mk-bin, bin-name, profile, lang
 # DOES THIS MAKE COFFEE NOW ??
 define mk-bin
@@ -78,8 +91,8 @@ $(BUILD)/$(strip $2)/%.o: %.$(GENERIC_SUFFIX_$(strip $3))
 		$$(C_PURPLE)$$(notdir $$@) $$(C_RESET)"
 
 out_$(strip $1)_$(strip $2) := $(NAME_$(strip $1)_$(strip $2))
-src_$(strip $1)_$(strip $2) !=                                                \
-    find $(strip $1) -type f -name "*.$(GENERIC_SUFFIX_$(strip $3))"
+
+src_$(strip $1)_$(strip $2) := $(SRC_$(strip $1))
 src_$(strip $1)_$(strip $2) += $(EXTRA_SRC_$(strip $1)_$(strip $2))
 
 objs_$(strip $1)_$(strip $2) :=                                               \