Panda3d: trying to use sampler2DArray in GLSL

test.py

import direct.directbase.DirectStart

from panda3d.core import *

vertex = '''
#version 330

in vec4 p3d_Vertex;
in vec2 p3d_MultiTexCoord0;
uniform mat4 p3d_ModelViewProjectionMatrix;

out vec2 texcoord;

void main() {
    gl_Position = p3d_ModelViewProjectionMatrix * p3d_Vertex;
    texcoord = p3d_MultiTexCoord0;
}
'''

fragment = '''
#version 330

uniform sampler2DArray sampler;

in vec2 texcoord;
out vec4 color;

void main() {
    color = texture(sampler, vec3(texcoord, 0));
}
'''

texture = TexturePool.load2dTextureArray('test0#.png')
shader = Shader.make(Shader.SLGLSL, vertex, fragment)

cm = CardMaker('test')
cm.setFrameFullscreenQuad()
cm.setHasUvs(True)
node = render2d.attachNewNode(cm.generate())
node.setShader(shader)
node.setShaderInput('sampler', texture)

run()