SuperTuxKart 1.5 upstream source (from official release tarball)

data/shaders/frustrum.vert

@@ -0,0 +1,8 @@
+uniform int idx;
+
+layout(location = 0) in vec3 Position;
+
+void main(void)
+{
+    gl_Position = u_shadow_projection_view_matrices[idx] * vec4(Position, 1.);
+}