CubemapComposer.hpp

#pragma once
 
#include <halp/controls.hpp>
#include <halp/meta.hpp>
#include <halp/texture.hpp>
 
#include <Gfx/Graph/RenderList.hpp>
 
#include <ossia/dataflow/geometry_port.hpp>
 
#include <QtGui/private/qrhi_p.h>
 
#include <cstdint>
#include <memory>
 
namespace Threedim
{
 
class CubemapComposer
{
public:
  halp_meta(name, "Cubemap Composer")
  halp_meta(category, "Visuals/3D")
  halp_meta(c_name, "cubemap_composer")
  halp_meta(
      manual_url,
      "https://ossia.io/score-docs/processes/cubemap-composer.html")
  halp_meta(uuid, "a7c3e8f1-5b2d-4a9e-8f3c-1d6e9b4a2c5f")
 
  struct ins
  {
    halp::texture_input<"+X", halp::custom_variable_texture> pos_x;
    halp::texture_input<"-X", halp::custom_variable_texture> neg_x;
    halp::texture_input<"+Y", halp::custom_variable_texture> pos_y;
    halp::texture_input<"-Y", halp::custom_variable_texture> neg_y;
    halp::texture_input<"+Z", halp::custom_variable_texture> pos_z;
    halp::texture_input<"-Z", halp::custom_variable_texture> neg_z;
  } inputs;
 
  struct
  {
    halp::gpu_cubemap_output<"Cubemap"> cubemap;
    // Scene-graph route: emits a scene_spec whose environment.skybox_texture
    // points at our cube handle. See CubemapLoader for the same pattern.
    struct
    {
      halp_meta(name, "Scene");
      ossia::scene_spec scene;
      uint8_t dirty{0};
    } scene_out;
  } outputs;
 
  // Per-face shape cache. Drives texture-recreation when face size changes.
  // Content-change detection uses the producer's `changed` flag instead of
  // a bytes-pointer compare: pointer identity does not detect in-place
  // buffer updates (ring-buffer video readback reuses the address).
  struct FaceFingerprint
  {
    int width{0};
    int height{0};
  };
 
  QRhiTexture* m_cubemapTex{};
  int m_faceSize{0};
  bool m_dirty{true};
  FaceFingerprint m_lastFaces[6]{};
  std::shared_ptr<ossia::scene_state> m_sceneState;
  int64_t m_sceneVersion{0};
  void* m_lastPublishedHandle{};
 
  // Dtor safety net — same rationale as CubemapLoader: guarantees the
  // VkImage is deleteLater'd even if release(RenderList&) was skipped,
  // so QRhi's destructor drains the pending-delete list before
  // vkDestroyDevice. Without this, Vulkan validation reports a leaked
  // VkImage on exit.
  ~CubemapComposer()
  {
    if(m_cubemapTex)
    {
      m_cubemapTex->deleteLater();
      m_cubemapTex = nullptr;
    }
  }
 
  void operator()() { }
 
  void init(score::gfx::RenderList& renderer, QRhiResourceUpdateBatch& res)
  {
    m_dirty = true;
  }
 
  void update(
      score::gfx::RenderList& renderer, QRhiResourceUpdateBatch& res,
      score::gfx::Edge* e)
  {
    // Face size comes from the largest input; content changes come from the
    // producer's `changed` flag (set by halp::texture's update() — see
    // avendish texture_formats.hpp), cleared here on consumption. Size is
    // tracked separately so a producer that resizes a face still triggers a
    // texture recreation even when it forgot to toggle `changed`.
    int maxSize = 0;
    int faceIdx = 0;
    auto checkFace = [&](auto& tex) {
      FaceFingerprint cur{tex.texture.width, tex.texture.height};
      const bool sizeChanged
          = (cur.width != m_lastFaces[faceIdx].width
             || cur.height != m_lastFaces[faceIdx].height);
      const bool contentChanged = tex.texture.changed;
      if(sizeChanged || contentChanged)
      {
        m_lastFaces[faceIdx] = cur;
        m_dirty = true;
      }
      tex.texture.changed = false; // consumed; producer will set it on next update()
      ++faceIdx;
      if(tex.texture.bytes && tex.texture.width > 0 && tex.texture.height > 0)
      {
        int s = std::max(tex.texture.width, tex.texture.height);
        maxSize = std::max(maxSize, s);
      }
    };
    checkFace(inputs.pos_x);
    checkFace(inputs.neg_x);
    checkFace(inputs.pos_y);
    checkFace(inputs.neg_y);
    checkFace(inputs.pos_z);
    checkFace(inputs.neg_z);
 
    if(maxSize <= 0)
      return;
 
    // Recreate texture if size changed
    if(maxSize != m_faceSize)
    {
      if(m_cubemapTex)
      {
        m_cubemapTex->deleteLater();
        m_cubemapTex = nullptr;
      }
      m_faceSize = maxSize;
      m_dirty = true;
    }
 
    if(!m_cubemapTex && m_faceSize > 0)
    {
      auto& rhi = *renderer.state.rhi;
      m_cubemapTex = rhi.newTexture(
          QRhiTexture::RGBA8, QSize{m_faceSize, m_faceSize}, 1,
          QRhiTexture::CubeMap | QRhiTexture::MipMapped
              | QRhiTexture::UsedWithGenerateMips);
      m_cubemapTex->create();
      outputs.cubemap.texture.handle = m_cubemapTex;
      m_dirty = true;
    }
 
    // Publish the cube on the Scene outlet (skybox_texture only — other
    // environment fields are left for EnvironmentLoader / elsewhere to
    // populate, merge_scenes overlays field-by-field).
    if(!m_sceneState)
      m_sceneState = std::make_shared<ossia::scene_state>();
    if(m_lastPublishedHandle != m_cubemapTex)
    {
      m_sceneState->environment = {};
      m_sceneState->environment.skybox_texture.native_handle = m_cubemapTex;
      m_lastPublishedHandle = m_cubemapTex;
      m_sceneVersion++;
      m_sceneState->version = m_sceneVersion;
      outputs.scene_out.scene.state = m_sceneState;
      outputs.scene_out.dirty = ossia::scene_port::dirty_environment;
    }
  }
 
  void release(score::gfx::RenderList& r)
  {
    if(m_cubemapTex)
    {
      m_cubemapTex->deleteLater();
      m_cubemapTex = nullptr;
    }
    m_faceSize = 0;
    outputs.cubemap.texture.handle = nullptr;
    if(m_sceneState)
    {
      m_sceneState->environment = {};
      m_lastPublishedHandle = nullptr;
      m_sceneVersion++;
      m_sceneState->version = m_sceneVersion;
      outputs.scene_out.dirty = ossia::scene_port::dirty_environment;
    }
  }
 
  void runInitialPasses(
      score::gfx::RenderList& renderer, QRhiCommandBuffer& commands,
      QRhiResourceUpdateBatch*& res, score::gfx::Edge& edge)
  {
    if(!m_cubemapTex)
      return;
 
    if(!m_dirty)
      return;
 
    bool anyUploaded = false;
 
    // Upload each face that has valid data
    auto uploadFace = [&](const auto& tex, int layer) {
      if(!tex.texture.bytes || tex.texture.width <= 0 || tex.texture.height <= 0)
        return;
 
      // Convert to QImage, scale to face size if needed
      QImage img(
          tex.texture.bytes, tex.texture.width, tex.texture.height,
          QImage::Format_RGBA8888);
 
      if(img.width() != m_faceSize || img.height() != m_faceSize)
        img = img.scaled(
            m_faceSize, m_faceSize, Qt::IgnoreAspectRatio,
            Qt::SmoothTransformation);
 
      img = img.convertToFormat(QImage::Format_RGBA8888);
 
      QRhiTextureSubresourceUploadDescription subresDesc(img);
      QRhiTextureUploadEntry entry(layer, 0, subresDesc);
      QRhiTextureUploadDescription desc({entry});
      res->uploadTexture(m_cubemapTex, desc);
      anyUploaded = true;
    };
 
    uploadFace(inputs.pos_x, 0); // +X
    uploadFace(inputs.neg_x, 1); // -X
    uploadFace(inputs.pos_y, 2); // +Y
    uploadFace(inputs.neg_y, 3); // -Y
    uploadFace(inputs.pos_z, 4); // +Z
    uploadFace(inputs.neg_z, 5); // -Z
 
    if(anyUploaded)
    {
      res->generateMips(m_cubemapTex);
    }
 
    m_dirty = false;
  }
};
 
}