/* SPDX-FileCopyrightText: 2022-2023 Blender Authors
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */

#include "infos/overlay_outline_infos.hh"

VERTEX_SHADER_CREATE_INFO(overlay_outline_prepass_gpencil)

#include "draw_grease_pencil_lib.glsl"
#include "draw_model_lib.glsl"
#include "draw_object_infos_lib.glsl"
#include "draw_view_clipping_lib.glsl"
#include "draw_view_lib.glsl"

uint outline_colorid_get()
{
  eObjectInfoFlag ob_flag = drw_object_infos().flag;
  bool is_active = flag_test(ob_flag, OBJECT_ACTIVE);

  if (is_transform) {
    return 0u; /* theme.colors.transform */
  }
  else if (is_active) {
    return 3u; /* theme.colors.active */
  }
  else {
    return 1u; /* theme.colors.object_select */
  }

  return 0u;
}

void main()
{
  float3 world_pos;
  float3 unused_N;
  float4 unused_color;
  float unused_strength;
  float2 unused_uv;

  gl_Position = gpencil_vertex(float4(uniform_buf.size_viewport, uniform_buf.size_viewport_inv),
                               world_pos,
                               unused_N,
                               unused_color,
                               unused_strength,
                               unused_uv,
                               gp_interp_flat.sspos_0,
                               gp_interp_flat.sspos_1,
                               gp_interp_flat.sspos_2,
                               gp_interp_flat.sspos_3,
                               gp_interp_flat.point_length,
                               gp_interp_flat.aspect,
                               gp_interp_noperspective.thickness,
                               gp_interp_noperspective.hardness);

  /* Small bias to always be on top of the geom. */
  gl_Position.z -= 1e-3f;

  /* ID 0 is nothing (background) */
  interp.ob_id = uint(drw_resource_id() + 1);

  /* Should be 2 bits only [0..3]. */
  uint outline_id = outline_colorid_get();

  /* Combine for 16bit uint target. */
  interp.ob_id = outline_id_pack(outline_id, interp.ob_id);

  view_clipping_distances(world_pos);
}
