VegetationMotion.h

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#pragma once
#include <glm/mat4x4.hpp>
#include <glm/vec2.hpp>
#include <glm/vec3.hpp>
#include <glm/vec4.hpp>
#include <optional>
#include <span>
#include <vector>
#include "common/Export.h"
#include "common/Result.h"
#include "graphics/VegetationField.h"
 
namespace eve::graphics {
enum class VegetationBatchMode { Object, Batched };
 
struct VegetationVertex {
    glm::vec3 position{0.f}, normal{0.f, 1.f, 0.f}, pivot{0.f};
    float     bending = 0.f, branch = 0.f, flutter = 0.f;
    float     variation = 0.5f, occlusion = 1.f, detail = 0.f;
    float     boundsHeight = 1.f, boundsRadius = 1.f;
    glm::vec2 texcoord{0.f}, secondaryTexcoord{0.f}, detailCoord{0.f};
    std::optional<glm::vec4> tangent;
};
 
struct VegetationMotion {
    double              time      = 0.;
    double              timeScale = 1., timeOffset = 0.;
    float               timeOverride = 0.f;
    glm::mat4           objectToWorld{1.f};
    glm::vec3           camera{0.f}, worldOrigin{0.f};
    VegetationBatchMode batchMode   = VegetationBatchMode::Object;
    bool                usePivots   = true;
    float               dynamicMode = 0.f, rigidity = 0.5f, facing = 0.5f;
    float               bending = 0.2f, bendingSpeed = 2.f, bendingScale = 1.f, bendingVariation = 0.f;
    float               branch = 0.2f, rolling = 0.2f, branchSpeed = 6.f, branchScale = 3.f, branchVariation = 0.f;
    float               flutter = 0.2f, flutterSpeed = 20.f, flutterScale = 10.f, flutterVariation = 0.f;
    float               globalBending = 1.f, globalBranch = 1.f, globalFlutter = 1.f, noiseTiling = 1.f;
    float               interaction = 1.f, interactionMask = 1.f, fadeDistance = 100.f;
    float               globalSize = 1.f, sizeFadeStart = 1000000.f, sizeFadeEnd = 1000001.f, distanceFadeBias = 1.f;
    float               perspectivePush = 0.f, perspectiveNoise = 0.f, perspectiveAngle = 1.f;
    uint8_t             motionLayer = 0, vertexLayer = 0;
    VegetationMask      noise{2,
                         2,
                              {glm::vec4(0.2f, 0.7f, 0.85f, 1.f), glm::vec4(0.8f, 0.4f, 0.55f, 1.f),
                               glm::vec4(0.4f, 0.2f, 0.65f, 1.f), glm::vec4(0.7f, 0.8f, 1.f, 1.f)}};
};
 
struct VegetationGeometry {
    std::vector<float> positions, normals;
    std::vector<float> vegetationFactors;
    std::vector<float> motionHighlights;
    std::vector<float> tangents, bitangents;
};
 
[[nodiscard]] EVENGINE_API_BACKENDS Result<VegetationGeometry> deformVegetation(
    const VegetationField& field, std::span<const VegetationVertex> vertices, const VegetationMotion& motion);
}  // namespace eve::graphics