layout(location = ATTRIBUTE_LOCATION_POSITION) in vec3 a_Position;
layout(location = ATTRIBUTE_LOCATION_POSITION_64LOW) in vec2 a_Position64Low;
layout(location = ATTRIBUTE_LOCATION_COLOR) in vec4 a_Color;
layout(location = ATTRIBUTE_LOCATION_SIZE) in float a_Size;
layout(location = ATTRIBUTE_LOCATION_UV) in vec2 a_Uv;

layout(std140) uniform commonUniforms {
  vec2 u_textSize;
  float u_raisingHeight;
  float u_heightfixed;
};

out vec4 v_color;
out vec2 v_uv;
out float v_opacity;

#pragma include "projection"
#pragma include "picking"

void main() {
  // cal style mapping - 数据纹理映射部分的计算
  v_color = a_Color;
  v_opacity = opacity;
  v_uv = a_Uv;
  vec4 project_pos = project_position(vec4(a_Position, 1.0), a_Position64Low);

  vec2 offset = project_pixel(offsets);

  float raisingHeight = u_raisingHeight;
  if (u_heightfixed < 1.0) {
    // false
    raisingHeight = project_pixel(u_raisingHeight);
  } else {
    if (
      u_CoordinateSystem == COORDINATE_SYSTEM_LNGLAT ||
      u_CoordinateSystem == COORDINATE_SYSTEM_LNGLAT_OFFSET
    ) {
      float mapboxZoomScale = 4.0 / pow(2.0, 21.0 - u_Zoom);
      raisingHeight = u_raisingHeight * mapboxZoomScale;
    }
  }

  gl_Position = project_common_position_to_clipspace(vec4(project_pos.xy + offset, raisingHeight, 1.0));

  gl_PointSize = a_Size * 2.0 * u_DevicePixelRatio;
  setPickingColor(a_PickingColor);
}