*wog

3 files changed, 11 insertions, 1 deletions

diff --git a/src/math/mat.c b/src/math/mat.c
index 8b32ba2..592dd5e 100644
--- a/src/math/mat.c
+++ b/src/math/mat.c
@@ -706,7 +706,7 @@ bool mat4_toeuler(Mat4* in, Euler* out) {
 	}
 }
 
-/*from unity src*/
+/*from unity source*/
 /*https://www.euclideanspace.com/maths/geometry/rotations/conversions/matrixToQuaternion/*/
 void mat4_toquat(Mat4* in, Quat* out) {
 	// Algorithm in Ken Shoemake's article in 1987 SIGGRAPH course notes
diff --git a/src/math/math.h b/src/math/math.h
index 1c2a9c0..1c65c01 100644
--- a/src/math/math.h
+++ b/src/math/math.h
@@ -179,6 +179,7 @@ void vec3_lerp(Vec3* v1, Vec3* v2, float t, Vec3* out);
 void vec3_slerp(Vec3* v1, Vec3* v2, float t, Vec3* out);
 
 void vec4_dividew(Vec4* v, Vec3* out);
+void vec4_dividewnoz(Vec4* v, Vec4* out);
 
 void vec4_tostring(Vec4* v, char buf[]);
 void vec4_print(Vec4* v);
diff --git a/src/math/vec4.c b/src/math/vec4.c
index 71ec6b6..3d6df46 100644
--- a/src/math/vec4.c
+++ b/src/math/vec4.c
@@ -16,6 +16,15 @@ void vec4_dividew(Vec4* v, Vec3* out) {
 	out->z = v->z * w;
 }
 
+void vec4_dividewnoz(Vec4* v, Vec4* out) {
+	ssr_assert(out && v);
+	float w = 1.f / v->w;
+	out->x = v->x * w;
+	out->y = v->y * w;
+	out->z = v->z;
+	out->w = v->w;
+}
+
 void vec4_tostring(Vec4* v, char buf[]) {
 	sprintf(buf, "%8.3f %8.3f %8.3f %8.3f", v->x, v->y, v->z, v->w);
 }