rewrite makefile

dropping `SDL2` requirement, opting for `glfw3` instead.

makefile

@@ -1,115 +1,86 @@
-# dependencies:
-#  - make
-#  - clang
-#  - bear (debug)
-#  - sdl2
-#  - git bash (windows)
-#
-# project name = the workspace directory name
-NAME := $(shell basename $(PWD))
-DEBUG ?= 0
-ARCH ?= 0
+SHELL = bash
+.SHELLFLAGS = -O globstar -c
+NAME    = tetris
+VERSION = 0.0.3
+DEBUG   ?= 0
+CC      ?= cc
+LD      ?= ld
+MARCH   ?= $(shell uname -m)
+KERNEL  ?= $(shell uname -s)
 
-# compiler settings
-CC := clang
-STD := c17
-CFLAGS := -m32 -Wall -Wextra -Wpedantic -Wno-pointer-arith
-LDFLAGS := -m32 -lm
+CFLAGS  += -c -std=gnu99 -Wall -Wextra -Wpedantic -MMD -MP
+LDFLAGS += -flto
 
-ifneq ($(DEBUG),0)
-CFLAGS  += -g -Og -fsanitize=address,undefined
-LDFLAGS += -fsanitize=address,undefined
-PROF    := dbg
+ifeq ($(KERNEL),)
+ISWIN := $(if $(filter $(OS),Windows_NT),1,0)
+ifeq ($(ISWIN),1)
+KERNEL = mingw
+MARCH  = x86_64
 else
-CFLAGS  += -DNDEBUG -O2 -Werror
-PROF    := rel
+MARCH  := $(shell uname -m)
+KERNEL := $(shell uname -s | tr '[:upper:]' '[:lower:]')
 endif
-
-ifneq ($(MAKECMDGOALS),clean)
-ifeq      ($(ARCH),linux-x86)
-CFLAGS  += -target x86_64-pc-linux-gnu $(shell pkg-config --cflags sdl2 SDL2_ttf)
-LDFLAGS += -target x86_64-pc-linux-gnu $(shell pkg-config --libs sdl2 SDL2_ttf)
-else ifeq ($(ARCH),win-x86)
-CFLAGS  += -target x86_64-pc-windows-gnu
-LDFLAGS += -target x86_64-pc-windows-gnu -fuse-ld=lld
-EXT     := .exe
 else
-$(error you must set the ARCH environment variable to one of these: 'linux-x86' 'win-x86')
+ISWIN := $(if $(filter $(KERNEL),mingw),1,0)
 endif
+ifeq ($(MARCH),)
+$(error must also set MARCH when manually setting KERNEL)
 endif
 
-ifneq ($(ARCH),0)
-# dirs
-DIR_BIN := bin/$(ARCH)/$(PROF)
-DIR_OBJ := obj/$(ARCH)/$(PROF)
-TARGET := $(DIR_BIN)/$(NAME)$(EXT)
-
-# source files
-SRC := $(wildcard src/*.c) $(wildcard src/**/*.c) $(wildcard src/**/**/*.c) $(wildcard src/**/**/**/*.c) $(wildcard src/**/**/**/**/*.c)
-OBJ := $(patsubst src/%,$(DIR_OBJ)/%,$(SRC:.c=.o))
-DEP := $(OBJ:.o=.d)
-SRC_ASSETS := $(wildcard assets/*)
-ASSETS := $(patsubst assets/%,$(DIR_BIN)/%,$(SRC_ASSETS))
-
-COMPILE_COMMANDS := $(DIR_OBJ)/compile_commands.json
+ifeq ($(DEBUG),1)
+PROF = dbg
+CFLAGS  += -UNDEBUG -Og -g -Wextra -Wpedantic
+CFLAGS  += $(if $(filter 1,$(ISWIN)),,-fsanitize=address,undefined) -ftrapv
+LDFLAGS += $(if $(filter 1,$(ISWIN)),,-fsanitize=address,undefined) -ftrapv
+else
+PROF = rel
+CFLAGS += -DNDEBUG -O3
 endif
 
-define wr_colour
-	@printf '\033[%sm%s\033[0m\n' $(2) $(1)
-endef
+CFLAGS  += $(shell pkg-config --cflags glfw3) -Ilib/glad/include
+LDFLAGS += $(shell pkg-config --libs glfw3) -lm
 
-# compiles and execute the binary
+SRC := $(shell echo src/**/*.c) lib/glad/src/gl.c
+RES := $(shell echo res/**.glsl)
+
+NAME += $(if $(filter 1,$(ISWIN)),.exe,)
+DIR_BIN := bin/$(MARCH)-$(KERNEL)/$(VERSION)/$(PROF)
+DIR_OBJ := obj/$(MARCH)-$(KERNEL)/$(VERSION)/$(PROF)
+
+BIN := $(DIR_BIN)/$(NAME)
+OBJ := $(SRC:%.c=$(DIR_OBJ)/%.o) $(RES:%=$(DIR_OBJ)/%.o)
+DEP := $(OBJ:%.o=%.d)
+
+.PHONY:
 run: compile
-	cd $(dir $(TARGET)) && ./$(notdir $(TARGET))
-compile: compile_commands $(TARGET) $(ASSETS)
+	$(BIN)
 
-.NOTPARALLEL:
+.PHONY:
+compile: $(BIN)
+
+.PHONY .NOTPARALLEL:
 clean:
-	rm -rf obj/ bin/ compile_commands.json
+	@[ -d obj/ ] && rm -rv obj/ || true
+	@[ -d bin/ ] && rm -rv bin/ || true
 
-# create the binary (linking step)
-$(TARGET): $(OBJ)
-	@$(call wr_colour,"CC: '$(CC)'",94)
-	@$(call wr_colour,"CFLAGS: '$(CFLAGS)'",94)
-	@$(call wr_colour,"LDFLAGS: '$(LDFLAGS)'",94)
-	@$(call wr_colour,"linking to: '$@'",92)
 
-	@mkdir -p ${@D}
-	@$(CC) -o $(TARGET) $^ $(LDFLAGS)
-	@$(call wr_colour,"current profile: '$(PROF)'",93)
+$(BIN): $(OBJ)
+	$(info [CC/LD] $@)
+	@mkdir -p $(@D)
+	@$(CC) -o $@ $^ $(LDFLAGS)
 
-# create .o and .d files
-$(DIR_OBJ)/%.o: src/%.c
-	@$(call wr_colour,"compiling $(notdir $@) from $(notdir $<)",92)
-	@mkdir -p ${@D}
-	@$(CC) $(CFLAGS) -c -MD -MP -std=$(STD) -x c -o $@ $<
+$(DIR_OBJ)/%.o: %.c
+	$(info [CC] $@)
+	@mkdir -p $(@D)
+	@$(CC) $(CFLAGS) -o $@ $<
 
-# copy assets
-$(DIR_BIN)/%: assets/%
-	@mkdir -p ${@D}
-	@cp -v $< $@
+$(DIR_OBJ)/res/%.o: res/%
+	$(info [LD] $@)
+	@mkdir -p $(@D)
+	@$(LD) -r -b binary -o $@ $<
 
-# update compile commands if the makefile has been updated (for linting)
-compile_commands: # default, empty rule
-ifneq ($(shell which bear),)
-ifneq ($(COMPILE_COMMANDS),)
-ifeq ($(NOCMDS),)
-.NOTPARALLEL .PHONY:
-compile_commands: $(COMPILE_COMMANDS)
-	@[ "$(readlink compile_commands.json)" != "$<" ] && ln -sf $< compile_commands.json
+.PHONY: x86_64-linux-gnu-gcc x86_64-w64-mingw32-gcc
+x86_64-linux-gnu-gcc:;   $(MAKE) $(CALL) $(MAKEFLAGS) CC=$@ MARCH=x86_64 KERNEL=linux
+x86_64-w64-mingw32-gcc:; $(MAKE) $(CALL) $(MAKEFLAGS) CC=$@ MARCH=x86_64 KERNEL=mingw
 
-.NOTPARALLEL:
-$(COMPILE_COMMANDS): makefile
-	@$(call wr_colour,"regenerating compile_commands.json thus recompiling.",93)
-	@mkdir -p ${@D} # ensure the target directory exists
-	@touch $@       # create the file so it isn't retriggered (will just change modification time if already exists)
-	@bear --output $@ -- make -B compile NOCMDS=1 # rebuild the current target using bear, to create the compile commands
-endif
-endif
-endif
-
-# disable implicit rules
-.SUFFIXES:
-
-# include the dependencies
 -include $(DEP)