GeometryToBuffer.hpp

#pragma once
#include <Threedim/GeometryToBufferStrategies.hpp>
#include <halp/buffer.hpp>
 
namespace Threedim
{
class ExtractBuffer
{
public:
  halp_meta(name, "Extract buffer")
  halp_meta(category, "Visuals/Utilities")
  halp_meta(c_name, "extract_attribute")
  halp_meta(description, "Extract a selected vertex attribute from geometry into a GPU buffer.")
  halp_meta(manual_url, "https://ossia.io/score-docs/processes/extract-buffer.html")
  halp_meta(uuid, "207ab744-1f3e-4e72-9a77-db6017cf3dd5")
 
  // FIXME allow to use strings instead.
  enum Attribute
  {
    Position,
    TexCoord,
    Color,
    Normal,
    Tangent,
 
    Attribute_0,
    Attribute_1,
    Attribute_2,
    Attribute_3,
    Attribute_4,
    Attribute_5,
    Attribute_6,
    Attribute_7,
    Attribute_8,
 
    Index,
 
    Buffer_0,
    Buffer_1,
    Buffer_2,
    Buffer_3,
    Buffer_4,
    Buffer_5,
    Buffer_6,
    Buffer_7,
    Buffer_8
  };
 
  struct ins
  {
    struct
    {
      halp_meta(name, "Geometry");
      halp::dynamic_gpu_geometry mesh;
      float transform[16]{};
      bool dirty_mesh = false;
      bool dirty_transform = false;
    } geometry;
 
    halp::combobox_t<"Attribute", Attribute> attribute;
    halp::toggle<"Pad vec3 to vec4"> pad_to_vec4;
  } inputs;
 
  struct
  {
    halp::gpu_buffer_output<"Buffer"> buffer;
  } outputs;
 
  ExtractBuffer();
 
  void init(score::gfx::RenderList& renderer, QRhiResourceUpdateBatch& res);
 
  void update(
      score::gfx::RenderList& renderer, QRhiResourceUpdateBatch& res,
      score::gfx::Edge* e);
 
  void release(score::gfx::RenderList& r);
 
  void runInitialPasses(
      score::gfx::RenderList& renderer, QRhiCommandBuffer& commands,
      QRhiResourceUpdateBatch*& res, score::gfx::Edge& edge);
 
  void operator()();
 
private:
  [[nodiscard]] static halp::attribute_semantic
  toAttributeLocation(Attribute attr) noexcept;
  void releaseStrategy();
  void updateOutput();
 
  ExtractionStrategyVariant m_strategy;
  Attribute m_currentAttribute{Position};
  ossia::geometry::gpu_buffer m_currentBuffer{};
  bool m_currentPadToVec4{false};
};
}