precision highp float;
attribute vec3 position;
varying vec2 uv;
varying vec2 hdConformedUV;
uniform vec2 u_RenderSize;
#ifdef NEEDS_CONTENT_TRANSFORM
uniform mat4 uContentTransformMatrix;
#endif

vec2 calculateHdConformedUV(vec2 uv, vec2 u_RenderSize) {
  float longestDim = max(u_RenderSize.x, u_RenderSize.y);
  float ratio = longestDim/1280.0;
  vec2 hdConformedUV = vec2(0.0);
  if (u_RenderSize.y >= u_RenderSize.x) {
    hdConformedUV.x = uv.x * u_RenderSize.x / (u_RenderSize.x / ratio);
    hdConformedUV.y = uv.y * ratio;
  } else {
    hdConformedUV.x = uv.x * ratio;
    hdConformedUV.y = uv.y * u_RenderSize.y / (u_RenderSize.y / ratio);
  }
  return hdConformedUV;
}

void main() {
#ifdef NEEDS_CONTENT_TRANSFORM
  gl_Position = uContentTransformMatrix * vec4(position, 1.0);
#else
  gl_Position = vec4(position, 1.0);
#endif
  uv = position.xy * 0.5 + 0.5;
  hdConformedUV = calculateHdConformedUV(uv, u_RenderSize);
}