#version 150 core

uniform ivec2 Viewport;
uniform mat3  Transform;
uniform vec4  BoundingBox;
uniform int   Border;

in vec2 Vert;
in vec2 Norm;

void main() {
  vec2 vert = mix(BoundingBox.xy, BoundingBox.zw, Vert) + Border * Norm;
  vec3 pos = Transform * vec3(vert, 1.0);

  gl_Position.xy = pos.xy * vec2(2.0, -2.0) / Viewport + vec2(-1.0, 1.0);
  gl_Position.z = 0.0;
  gl_Position.w = 1.0;
}