Skip multiplying the unused column of modelview

1 files changed, 3 insertions, 2 deletions

diff --git a/glass.vert b/glass.vert
index 5ce3508..14e43c8 100644
--- a/glass.vert
+++ b/glass.vert
@@ -10,8 +10,9 @@ uniform mat4 mvp, mv, light_mvp;
 
 void main()
 {
-	vec3 t = (mv * vec4(gl_MultiTexCoord1.xyz, 0.0)).xyz;
-	vec3 n = (mv * vec4(gl_Normal, 0.0)).xyz;
+	mat3 mv3 = mat3(mv);
+	vec3 t = (mv3 * gl_MultiTexCoord1.xyz);
+	vec3 n = (mv3 * gl_Normal);
 
 	gl_Position = mvp * gl_Vertex;