Add project source code

3 files changed, 43 insertions, 0 deletions

diff --git a/src/util/CMakeLists.txt b/src/util/CMakeLists.txt
new file mode 100644
index 0000000..9c808f5
--- /dev/null
+++ b/src/util/CMakeLists.txt
@@ -0,0 +1,2 @@
+add_library(util "src/util.c")
+target_include_directories(util PUBLIC "inc")
diff --git a/src/util/inc/util.h b/src/util/inc/util.h
new file mode 100644
index 0000000..e42c5b2
--- /dev/null
+++ b/src/util/inc/util.h
@@ -0,0 +1,31 @@
+#ifndef UTIL_H
+#define UTIL_H
+
+#include <stdbool.h>
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+#if __STDC_VERSION__ >= 201112L
+#define UTIL_STATIC_ASSERT(exp, msg) _Static_assert(exp, msg)
+#else
+#define UTIL_STATIC_ASSERT__(exp, l, msg) enum {static_assert##l##__ = 1 / !!(exp)}
+#define UTIL_STATIC_ASSERT_(exp, l, msg) UTIL_STATIC_ASSERT__(exp, l, msg)
+#define UTIL_STATIC_ASSERT(exp, msg) UTIL_STATIC_ASSERT_(exp, __LINE__, msg)
+#endif
+
+struct util_rect
+{
+    unsigned long x, y;
+    short w, h;
+};
+
+bool util_collision(const struct util_rect *a, const struct util_rect *b);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* UTIL_H */
diff --git a/src/util/src/util.c b/src/util/src/util.c
new file mode 100644
index 0000000..f87c14a
--- /dev/null
+++ b/src/util/src/util.c
@@ -0,0 +1,10 @@
+#include <util.h>
+#include <stdbool.h>
+
+bool util_collision(const struct util_rect *const a, const struct util_rect *const b)
+{
+    return !((a->x >= b->x + b->w)
+        || (b->x >= a->x + a->w)
+        || (a->y >= b->y + b->h)
+        || (b->y >= a->y + a->h));
+}