# Included by all module and cli Makefiles.
# Each including Makefile must set ROOT before including this file:
#   ROOT := $(abspath <relative path to repo root>)

CC      = gcc
CFLAGS  = -std=c11 -Wall -Wextra -D_GNU_SOURCE -flto -I$(ROOT)/include
BUILD   = $(ROOT)/build

# Automatic dependency generation.
# -MMD  emit a .d file listing header prerequisites alongside each .o
# -MP   add phony targets for headers so removed headers don't break make
DEPFLAGS = -MMD -MP

# -----------------------------------------------------------------------
# Feature flags
# Set FEATURES to a space-separated list of optional deps to enable.
# Example: make FEATURES="glfw turbojpeg"
# Headless (no optional deps): make FEATURES=
#
# Available features:
#   glfw       — GLFW window management + OpenGL renderer (libglfw3, libglew)
#   vulkan     — GLFW window management + Vulkan renderer (vulkan-loader, libglfw3)
#   turbojpeg  — MJPEG encode/decode (libturbojpeg)
#   xorg       — XRandR geometry queries + XShmGetImage screen grab (libx11, libxrandr)
#   vaapi      — VA-API hardware encode/decode (libva)
# -----------------------------------------------------------------------
FEATURES ?=
export FEATURES

# Inject HAVE_ defines into CFLAGS
CFLAGS += $(if $(filter glfw,      $(FEATURES)),-DHAVE_GLFW)
CFLAGS += $(if $(filter vulkan,    $(FEATURES)),-DHAVE_VULKAN)
CFLAGS += $(if $(filter turbojpeg, $(FEATURES)),-DHAVE_TURBOJPEG)
CFLAGS += $(if $(filter xorg,      $(FEATURES)),-DHAVE_XORG)
CFLAGS += $(if $(filter vaapi,     $(FEATURES)),-DHAVE_VAAPI)

# Per-feature pkg-config flags — accumulated into PKG_CFLAGS / PKG_LDFLAGS.
# Modules that need them add $(PKG_CFLAGS) to their compile rules.
# The node and cli link rules append $(PKG_LDFLAGS).
PKG_CFLAGS  :=
PKG_LDFLAGS :=

ifneq (,$(filter glfw,$(FEATURES)))
	PKG_CFLAGS  += $(shell pkg-config --cflags glfw3 glew 2>/dev/null)
	PKG_LDFLAGS += $(shell pkg-config --libs   glfw3 glew 2>/dev/null) -lGL
endif
ifneq (,$(filter turbojpeg,$(FEATURES)))
	PKG_CFLAGS  += $(shell pkg-config --cflags libturbojpeg 2>/dev/null)
	PKG_LDFLAGS += $(shell pkg-config --libs   libturbojpeg 2>/dev/null)
endif
ifneq (,$(filter xorg,$(FEATURES)))
	PKG_CFLAGS  += $(shell pkg-config --cflags x11 xrandr 2>/dev/null)
	PKG_LDFLAGS += $(shell pkg-config --libs   x11 xrandr 2>/dev/null)
endif
ifneq (,$(filter vaapi,$(FEATURES)))
	PKG_CFLAGS  += $(shell pkg-config --cflags libva 2>/dev/null)
	PKG_LDFLAGS += $(shell pkg-config --libs   libva 2>/dev/null)
endif

CFLAGS += $(PKG_CFLAGS)