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         = {};
    };
 
}
 
#endif // AVARA3D_RENDER_DRAWPACKET_H