#include <utils>

uniform mat4 projectionMatrix;
uniform mat4 modelViewMatrix;

in vec3 position;

out vec3 pos;


void main() {
  pos = position.xyz;
  pos.x *= poolHalfSize.x;
  pos.z *= poolHalfSize.y;
  // 墙体高度与水面齐平：y ∈ [-1, 1] 映射到 [-poolHeight, 0]
  pos.y = ((1.0 - pos.y) * 0.5 - 1.0) * poolHeight;

  gl_Position = projectionMatrix * modelViewMatrix * vec4(pos, 1.0);
}