seperate out library compilation from general compilation

This can help with a more nuanced compilation. (eg. use system libraries
rather than compile our own)
Furthermore, it decreases the needed compilation time, since we needn't
recompile the whole thing when having cleaned out our local sources.

.github/workflows/ci.yaml

@@ -1,30 +0,0 @@
-name: CI
-on:
-  push:
-    branches: [main]
-
-jobs:
-  compile-and-test:
-    strategy:
-      matrix:
-        os:
-          - ubuntu-latest
-          - ubuntu-24.04-arm
-          - windows-latest
-          - windows-11-arm
-          - macos-latest
-    runs-on: ${{matrix.os}}
-    steps:
-      - uses: actions/checkout@v5
-        with:
-          repository: ${{github.repository}}
-          submodules: true
-          fetch-depth: 1
-      - uses: actions/cache@v4
-        with:
-          path: lib/obj/
-          key: ${{runner.os}}-lib/obj-${{github.sha}}
-          restore-keys: ${{runner.os}}-lib/obj-
-      - run: make libs
-      - run: make all
-      - run: make test

Makefile

@@ -35,13 +35,13 @@ $(warning Detected Windows_NT, please refer to the documentation if you encounte
 endif
 
 # TODO: find a better method to find all source files
+# WARN: find a better method for selecting the object files
 # find all the source files using wildcards
 # NOTE: MS-DOS and MS-Windows uses backslash `\`, this might break.
-RES  := $(wildcard res/*)
-SRC  := $(wildcard src/*.c src/*/*.c src/*/*/*.c src/*/*/*/*.c src/*/*/*/*/*.c src/*/*/*/*/*/*.c src/*/*/*/*/*/*/*.c src/*/*/*/*/*/*/*/*.c) lib/glad/gl.c
-OBJ  := $(SRC:%.c=obj/%.o) $(RES:%=obj/%.o)
-TSRC := $(wildcard test/*.c test/*/*.c test/*/*/*.c test/*/*/*/*.c test/*/*/*/*/*.c test/*/*/*/*/*/*.c test/*/*/*/*/*/*/*.c test/*/*/*/*/*/*/*/*.c)
-TOBJ := $(TSRC:%.c=obj/%.o)
+RES  := $(wildcard res/*.glsl)
+SRC  := $(wildcard src/*.c  src/*/*.c  src/*/*/*.c  src/*/*/*/*.c  src/*/*/*/*/*.c  src/*/*/*/*/*/*.c  src/*/*/*/*/*/*/*.c  src/*/*/*/*/*/*/*/*.c) lib/glad/gl.c
+OBJ  := $(SRC:%.c=obj/%.o)
+TEST := $(wildcard test/*.c test/*/*.c test/*/*/*.c test/*/*/*/*.c test/*/*/*/*/*.c test/*/*/*/*/*/*.c test/*/*/*/*/*/*/*.c test/*/*/*/*/*/*/*/*.c)
 
 # TODO: potentially automatically detect whether we should compile libs, or if we can just go ahead.
 .PHONY: all libs test clean clean-libs
@@ -67,7 +67,8 @@ bin/$(NAME): $(OBJ)
 	@$(CC) -o $@ $^ $(LDFLAGS) $(LDLIBS)
 
 # link together a testing binary
-bin/TEST_$(NAME): $(TOBJ) $(filter-out main.o,$(OBJ))
+# BUG: testing sources must be selected better
+bin/TEST_$(NAME): $(OBJ)
 	$(info [CC/LD]	$@)
 	@mkdir -p $(@D)
 	@$(CC) -o $@ $^ $(LDFLAGS) $(LDLIBS)

include/endian.h

@@ -1,9 +1,46 @@
 /* Copyright (c) 2025 Quinn
  * Licensed under the MIT Licence. See LICENSE for details */
+
 #ifndef PORTABLE_ENDIAN_H
 #define PORTABLE_ENDIAN_H 1
 
 #if defined(__GNUC__)
+
+/* test for the byteswap header */
+#if __has_include(<byteswap.h>)
+#include <byteswap.h>
+#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
+#define le16toh(x) (x)
+#define le32toh(x) (x)
+#define le64toh(x) (x)
+#define htole16(x) (x)
+#define htole32(x) (x)
+#define htole64(x) (x)
+#define be16toh(x) bswap_16(x)
+#define be32toh(x) bswap_32(x)
+#define be64toh(x) bswap_64(x)
+#define htobe16(x) bswap_16(x)
+#define htobe32(x) bswap_32(x)
+#define htobe64(x) bswap_64(x)
+#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
+#define le16toh(x) bswap_16(x)
+#define le32toh(x) bswap_32(x)
+#define le64toh(x) bswap_64(x)
+#define htole16(x) bswap_16(x)
+#define htole32(x) bswap_32(x)
+#define htole64(x) bswap_64(x)
+#define be16toh(x) (x)
+#define be32toh(x) (x)
+#define be64toh(x) (x)
+#define htobe16(x) (x)
+#define htobe32(x) (x)
+#define htobe64(x) (x)
+#else
+#error machine architecture unsupported! Expected either big-endian or little-endian, make sure to use a compiler which defines __BYTE_ORDER__ (like clang or gcc)
+#endif /* byte order */
+
+/* otherwise, utilise the compiler built-ins */
+#else
 #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
 #define le16toh(x) __uint16_identity(x)
 #define le32toh(x) __uint32_identity(x)
@@ -34,7 +71,10 @@
 #error machine architecture unsupported! Expected either big-endian or little-endian, make sure to use a compiler which defines __BYTE_ORDER__ (like clang or gcc)
 #endif /* byte order */
 
+#endif /* has byteswap.h */
+
 #else
 #error GNU C is unavailable
 #endif /* __GNUC__ */
+
 #endif /* PORTABLE_ENDIAN_H */