1 files changed, 17 insertions, 0 deletions
diff --git a/demo/source/chgcol.c b/demo/source/chgcol.c
new file mode 100644
index 0000000..cbd653e
--- /dev/null
+++ b/demo/source/chgcol.c
@@ -0,0 +1,17 @@
+#include <agbx-demo.h>
+
+#include <agbx/gfx.h>
+
+void agbxd_chgcol(agbxd_dat * _dat,agbx_i8 const _dir) {
+	constexpr agbx_i8 maxcol = 0x7u;
+	agbx_i8 col = _dat->col;
+	if (!_dir) {
+		if (!col) {col = maxcol;}
+		else      {--col;}
+	}
+	else {
+		if (col == maxcol) {col = 0x0u;}
+		else               {++col;}
+	}
+	_dat->col = col;
+}