ludum_dare_46/res/shaders/s2e/vert.gls

#version 330 core

uniform vec4 subtexture = vec4(0, 0, 1, 1);
uniform mat4 mvp;

layout (location = 0) in vec3 vertices;
layout (location = 1) in vec2 itexCoords;

out vec2 texCoords;

void main() {
	texCoords = itexCoords * subtexture.zw + subtexture.xy;
	gl_Position = mvp * vec4(vertices, 1);
}