[require]
GLSL >= 1.10

[fragment shader]
uniform sampler2D shadow_sampler;
varying vec2 texcoord;

void main()
{
	gl_FragColor = texture2D(shadow_sampler, texcoord);
}

[vertex shader]
#version 120

varying vec2 texcoord;

void main()
{
	gl_Position = gl_Vertex;
	texcoord = (gl_Vertex.xy + vec2(1, 1)) / 2.0;
}