properly handling config paths

Makefile

@@ -1,17 +1,56 @@
 src = $(wildcard *.c)
 obj = $(src:.c=.o)
 
+# Build type parameter
+
+ifeq ($(BUILD),debug)
+	CFLAGS_BUILD = -ggdb
+	GLAD_GEN = c-debug
+else
+	CFLAGS_BUILD = -O2 -march=native
+	GLAD_GEN = c
+endif
+
+# Detect OS if not specified (OSX, Linux, BSD are supported)
+
+ifndef INSTALL
+    UNAME_S := $(shell uname -s)
+    ifeq ($(UNAME_S),Darwin)
+        INSTALL = osx
+    else
+        INSTALL = unix
+    endif
+endif
+
+# Install type parameter
+
+ifeq ($(INSTALL),standalone)
+    CFLAGS_INSTALL = -DGLAVA_STANDALONE
+endif
+
+ifeq ($(INSTALL),unix)
+    CFLAGS_INSTALL = -DGLAVA_UNIX
+    ifdef XDG_CONFIG_DIRS
+        SHADER_DIR = $(firstword $(subst :, ,$XDG_CONFIG_DIR))/glava
+    else
+        SHADER_DIR = /etc/xdg/glava
+    endif
+endif
+
+ifeq ($(INSTALL),osx)
+    CFLAGS_INSTALL = -DGLAVA_OSX
+    SHADER_DIR = /Library/glava
+endif
+
 LDFLAGS = -lpulse -lpulse-simple -pthread -lOpenGL -lglfw -ldl -lm -lX11
 
 PYTHON = python
 
 GLAD_INSTALL_DIR = glad
 GLAD_SRCFILE = ./glad/src/glad.c
-GLAD_ARGS_RELEASE = --generator=c --extensions=GL_EXT_framebuffer_multisample,GL_EXT_texture_filter_anisotropic
-GLAD_ARGS_DEBUG = --generator=c-debug --extensions=GL_EXT_framebuffer_multisample,GL_EXT_texture_filter_anisotropic
+GLAD_ARGS = --generator=$(GLAD_GEN) --extensions=GL_EXT_framebuffer_multisample,GL_EXT_texture_filter_anisotropic
 CFLAGS_COMMON = -I glad/include
-
-CFLAGS_USE = $(CFLAGS_COMMON) $(CFLAGS)
+CFLAGS_USE = $(CFLAGS_COMMON) $(CFLAGS_BUILD) $(CFLAGS_INSTALL) $(CFLAGS)
 
 all: glad glava
 
@@ -23,16 +62,17 @@ glava: $(obj)
 
 .PHONY: glad
 glad:
-	cd $(GLAD_INSTALL_DIR) && $(PYTHON) -m glad $(GLAD_ARGS_RELEASE) --out-path=.
-	$(CC) $(CFLAGS_USE) -o glad.o $(GLAD_SRCFILE) -c
-
-.PHONY: glad-debug
-glad-debug:
-	cd $(GLAD_INSTALL_DIR) && $(PYTHON) -m glad $(GLAD_ARGS_DEBUG) --out-path=.
+	cd $(GLAD_INSTALL_DIR) && $(PYTHON) -m glad $(GLAD_ARGS) --out-path=.
 	$(CC) $(CFLAGS_USE) -o glad.o $(GLAD_SRCFILE) -c
 
 .PHONY: clean
 clean:
 	rm -f $(obj) glava glad.o
 
-CFLAGS = -ggdb
+ifneq ($(INSTALL),standalone)
+.PHONY: install
+install:
+	cp glava /usr/bin/glava
+	mkdir -p $(SHADER_DIR)
+	cp -Rv shaders/* $(SHADER_DIR)
+endif