overlay_next_background.hh

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/* SPDX-FileCopyrightText: 2023 Blender Authors
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */
 
#pragma once
 
#include "overlay_next_private.hh"
 
namespace blender::draw::overlay {
 
class Background {
 private:
  PassSimple bg_ps_ = {"Background"};
 
  GPUFrameBuffer *framebuffer_ref_ = nullptr;
 
 public:
  void begin_sync(Resources &res, const State &state)
  {
    DRWState pass_state = DRW_STATE_WRITE_COLOR | DRW_STATE_BLEND_BACKGROUND;
    float4 color_override(0.0f, 0.0f, 0.0f, 0.0f);
    int background_type;
 
    if (DRW_state_is_viewport_image_render() && !DRW_state_draw_background()) {
      background_type = BG_SOLID;
      color_override[3] = 1.0f;
    }
    else if (state.space_type == SPACE_IMAGE) {
      background_type = BG_SOLID_CHECKER;
    }
    else if (state.space_type == SPACE_NODE) {
      background_type = BG_MASK;
      pass_state = DRW_STATE_WRITE_COLOR | DRW_STATE_BLEND_MUL;
    }
    else if (!DRW_state_draw_background()) {
      background_type = BG_CHECKER;
    }
    else if (state.v3d->shading.background_type == V3D_SHADING_BACKGROUND_WORLD &&
             state.scene->world)
    {
      background_type = BG_SOLID;
      /* TODO(fclem): this is a scene referred linear color. we should convert
       * it to display linear here. */
      color_override = float4(UNPACK3(&state.scene->world->horr), 1.0f);
    }
    else if (state.v3d->shading.background_type == V3D_SHADING_BACKGROUND_VIEWPORT &&
             state.v3d->shading.type <= OB_SOLID)
    {
      background_type = BG_SOLID;
      color_override = float4(UNPACK3(state.v3d->shading.background_color), 1.0f);
    }
    else {
      switch (UI_GetThemeValue(TH_BACKGROUND_TYPE)) {
        case TH_BACKGROUND_GRADIENT_LINEAR:
          background_type = BG_GRADIENT;
          break;
        case TH_BACKGROUND_GRADIENT_RADIAL:
          background_type = BG_RADIAL;
          break;
        default:
        case TH_BACKGROUND_SINGLE_COLOR:
          background_type = BG_SOLID;
          break;
      }
    }
 
    bg_ps_.init();
    bg_ps_.framebuffer_set(&framebuffer_ref_);
    /* Don't clear background for the node editor. The node editor draws the background and we
     * need to mask out the image from the already drawn overlay color buffer. */
    if (state.space_type != SPACE_NODE) {
      bg_ps_.clear_color(float4(0.0f));
    }
 
    if ((state.clipping_plane_count != 0) && (state.rv3d) && (state.rv3d->clipbb)) {
      bg_ps_.state_set(DRW_STATE_WRITE_COLOR | DRW_STATE_BLEND_ALPHA | DRW_STATE_CULL_BACK);
      bg_ps_.shader_set(res.shaders.background_clip_bound.get());
      bg_ps_.push_constant("ucolor", res.theme_settings.color_clipping_border);
      bg_ps_.push_constant("boundbox", &state.rv3d->clipbb->vec[0][0], 8);
      bg_ps_.draw(DRW_cache_cube_get());
    }
 
    bg_ps_.state_set(pass_state);
    bg_ps_.shader_set(res.shaders.background_fill.get());
    bg_ps_.bind_ubo("globalsBlock", &res.globals_buf);
    bg_ps_.bind_texture("colorBuffer", &res.color_render_tx);
    bg_ps_.bind_texture("depthBuffer", &res.depth_tx);
    bg_ps_.push_constant("colorOverride", color_override);
    bg_ps_.push_constant("bgType", background_type);
    bg_ps_.draw_procedural(GPU_PRIM_TRIS, 1, 3);
  }
 
  void draw(Framebuffer &framebuffer, Manager &manager, View & /*view*/)
  {
    framebuffer_ref_ = framebuffer;
    manager.submit(bg_ps_);
  }
};
 
}  // namespace blender::draw::overlay