第 10 课：Texture Coordinates

实现

// Already available:
// attribute vec3 position;
// attribute vec2 uv;

uniform sampler2D color;
out vec2 vUV;

void main() {
  vec3 ratio = vec3(projectionMatrix[0][0] / projectionMatrix[1][1], 1.0, 1.0);
  vUV = uv;
  gl_Position = vec4(position * ratio, 1.0);
}