overlay_xray_fade.hh

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/* SPDX-FileCopyrightText: 2019 Blender Authors
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */

 
#pragma once
 
#include "overlay_base.hh"
 
namespace blender::draw::overlay {

class XrayFade : Overlay {
 private:
  PassSimple xray_fade_ps_ = {"XrayFade"};
 
 public:
  void begin_sync(Resources &res, const State &state) final
  {
    enabled_ = state.xray_enabled && (state.xray_opacity > 0.0f) && !res.is_selection();
 
    if (!enabled_) {
      return;
    }
 
    {
      PassSimple &pass = xray_fade_ps_;
      pass.init();
      pass.state_set(DRW_STATE_WRITE_COLOR | DRW_STATE_BLEND_MUL);
      pass.framebuffer_set(&res.overlay_color_only_fb);
      pass.shader_set(res.shaders->xray_fade.get());
      /* TODO(fclem): Confusing. The meaning of xray depth texture changed between legacy engine
       * and overlay next. To be renamed after shaders are not shared anymore. */
      pass.bind_texture("depth_tx", &res.xray_depth_tx);
      pass.bind_texture("depth_txInfront", &res.xray_depth_in_front_tx);
      pass.bind_texture("xray_depth_tx", &res.depth_tx);
      pass.bind_texture("xray_depth_txInfront", &res.depth_in_front_tx);
      pass.push_constant("opacity", 1.0f - state.xray_opacity);
      pass.draw_procedural(GPU_PRIM_TRIS, 1, 3);
    }
  }
 
  void draw_color_only(Framebuffer &framebuffer, Manager &manager, View & /*view*/) final
  {
    if (!enabled_) {
      return;
    }
 
    GPU_framebuffer_bind(framebuffer);
    manager.submit(xray_fade_ps_);
  }
};
 
}  // namespace blender::draw::overlay