From e0a2f217634c7e0133378a23c94e60c7f74c77fb Mon Sep 17 00:00:00 2001
From: quou <quou@disroot.org>
Date: Thu, 1 Aug 2024 21:28:45 +1000
Subject: scale matrix

---
 maths.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

(limited to 'maths.c')

diff --git a/maths.c b/maths.c
index a0c9ed5..5ade946 100644
--- a/maths.c
+++ b/maths.c
@@ -180,6 +180,12 @@ void mtx_push_rot_z(int a) {
 	mtx_push(m);
 }
 
+void mtx_push_scale(int s) {
+	int m[0x10];
+	mtx_scale(m, s);
+	mtx_push(m);
+}
+
 int* mtx_pop(void) {
 	assert(mtx_stack_top > 0);
 	return mtx_stack[--mtx_stack_top];
@@ -234,6 +240,14 @@ int* mtx_rot_z(int* d, int a) {
 	return d;
 }
 
+int* mtx_scale(int* d, int s) {
+	mtx_iden(d);
+	d[0]  = s;
+	d[5]  = s;
+	d[10] = s;
+	return d;
+}
+
 int* mtx_apply(const int* m, int* v) {
 	int s[4];
 	vec_cpy(s, v, 4);
-- 
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