DrawPacket.h

//
//  DrawPacket.h
//  avara3d
//
//  Created by Morgan Davis on 12/28/25.
//  Copyright © 2026 Morgan K Davis. All rights reserved.
//
 
#ifndef AVARA3D_RENDER_DRAWPACKET_H
#define AVARA3D_RENDER_DRAWPACKET_H
 
#include <optional>
 
#include "a3d/Math.h"
#include "a3d/mesh/Line.h"
#include "a3d/render/PipelineDesc.h"
#include "a3d/visual/Ground.h"
 
namespace a3d {
 
class Material;
class MeshElement;
class Node;
 
// [Internal Types]
 
struct BackgroundPass {
    PipelineId                pipelineId  = INVALID_PIPELINE_ID;
    PipelineDesc              desc        = {};
    std::shared_ptr<Material> material    = nullptr; // gross
    math::quat                orientation = math::quat(1.0f);
};
 
struct GroundPass {
    PipelineId            pipelineId = INVALID_PIPELINE_ID;
    PipelineDesc          desc       = {};
    std::optional<Ground> ground     = {};
};
 
struct LinesPass {
    PipelineId        pipelineId = INVALID_PIPELINE_ID;
    PipelineDesc      desc       = {};
    math::mat4        model      = math::mat4(1.0f); // identity for world-space lines
    std::vector<Line> lines      = {};
};
 
struct DrawItem {
    PassKind     pass         = PassKind::MainOpaque;
    PipelineId   pipelineId   = INVALID_PIPELINE_ID;
    PipelineDesc desc         = {};
    uint32_t     elementIndex = 0;
    MeshElement* element      = nullptr;
    Material*    material     = nullptr;
    math::vec4   tint         = math::vec4(0.0f); // RGB color, a blend strength
    math::mat4   model        = math::mat4(1.0);
    float        depth        = 0.0f;
    int          renderOrder  = 0;
    uint64_t     batchKey     = 0;
    uint32_t     sequence     = 0;
    bool         transparent  = false;
};
 
struct DrawPacket {
    BackgroundPass        backgroundPass = {};
    GroundPass            groundPass     = {};
    std::vector<DrawItem> mainPassItems  = {};
    // opaqueItems
    // maskItems
    // transparentItems
    std::vector<DrawItem> wireframePassItems = {};
    LinesPass             linesPass          = {};
    std::vector<Node*>    lightNodes         = {};
};
 
} // namespace a3d
 
#endif // AVARA3D_RENDER_DRAWPACKET_H