# Copyright (jacekpoz 2024). Licensed under the EUPL-1.2 or later.

CC = clang
CFLAGS  = -std=c11 -Wall -Wextra -Wpedantic
CFLAGS += -fPIC -fstrict-aliasing
CFLAGS += $(shell pkg-config --cflags glfw3 vulkan)
LDFLAGS = $(shell pkg-config --libs glfw3 vulkan)

ifdef DEBUG
CFLAGS += -DDEBUG -g
else
CFLAGS += -O3
endif

GLSLC = glslc
GLSLFLAGS = 

NAME = ptk

CFLAGS += -DPTK_ENGINE_NAME=\"ptk\"
CFLAGS += -DPTK_VERSION_MAJOR=0
CFLAGS += -DPTK_VERSION_MINOR=1
CFLAGS += -DPTK_VERSION_PATCH=0

INCLUDE = include
SRC = src
CFLAGS += -I$(INCLUDE) -I$(SRC)

BIN = target

H = $(shell find $(SRC) -type f -name "*.h")
H += $(shell find $(INCLUDE) -type f -name "*.h")

PROG = $(shell find $(SRC) -type f -name "*.c")
OBJ = $(addprefix $(BIN)/, $(PROG:.c=.o))

SHADER = shaders

SHADER_SRC = $(shell find $(SHADER) -type f -name "*.glsl")
SHADER_OBJ = $(addprefix $(BIN)/, $(SHADER_SRC:.glsl=.spv))

.PHONY: all test clean

all: dirs shaders
	$(MAKE) $(NAME)

dirs:
	mkdir -p $(BIN)

$(NAME): $(OBJ)
	$(CC) $^ $(CFLAGS) $(LDFLAGS) -shared -o $(BIN)/lib$@.so

$(BIN)/%.o: %.c $(H)
	@mkdir -p $(@D)
	$(CC) $(CFLAGS) -c $< -o $@

shaders: $(SHADER_OBJ)

$(BIN)/%.vert.spv: %.vert.glsl
	@mkdir -p $(@D)
	$(GLSLC) $(GLSLFLAGS) -fshader-stage=vert $< -o $@

$(BIN)/%.frag.spv: %.frag.glsl
	@mkdir -p $(@D)
	$(GLSLC) $(GLSLFLAGS) -fshader-stage=frag $< -o $@

clean:
	rm -rf $(BIN)

test:
	@CC="$(CC)" \
	CFLAGS="$(CFLAGS)" \
	BIN="$(BIN)" \
	INCLUDE="$(INCLUDE)" \
	$(MAKE) -f test/Makefile

example:
	@CC="$(CC)" \
	CFLAGS="$(CFLAGS)" \
	BIN="$(BIN)" \
	INCLUDE="$(INCLUDE)" \
	$(MAKE) -f examples/Makefile