VegetationWind.h

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#pragma once
#include <array>
#include <glm/glm.hpp>
#include "common/Result.h"
namespace eve::graphics {
struct VegetationWindState {
    glm::vec3 direction{0};
    float     strength = 0;
    float phase = 0;
    float updatePhase = 0;
};
 
struct VegetationWindAudioState {
    float currentWindSpeed = 0;
    float anchorVolume = 0;
    float volume = 0;
    bool  processing = false;
    bool  playing = false;
};
 
[[nodiscard]] EVENGINE_API_BACKENDS Result<void> advanceVegetationWindAudio(VegetationWindAudioState& state,
                                                                            float windStrength, float transitionTime,
                                                                            float dt, bool enabled, bool clipAvailable);
struct VegetationWindProfile {
    glm::vec3 flex{0.8F, 1.15F, 0.1F}, frequency{0.25F, 0.5F, 1.3F};
    float     maximumDistance = 100;
    bool      enabled = false, billboard = false, alphaTest = true;
};
[[nodiscard]] EVENGINE_API_BACKENDS Result<std::array<float, 14>> packVegetationWind(
    const VegetationWindState& state, const VegetationWindProfile& profile, double seconds);
struct VegetationWindInput {
    glm::vec3 position{0}, worldOffset{0}, cameraPosition{0};
    glm::mat3 objectToWorld{1};
    glm::vec2 widthHeight{1};
    glm::vec3 flex{0.8F, 1.15F, 0.1F}, frequency{0.25F, 0.5F, 1.3F};
    float     maximumDistance = 100;
    float sinTimeQuarter = 0, sinTimeFull = 0;
    bool  enabled = true, billboard = false, alphaTest = true;
};
[[nodiscard]] EVENGINE_API_BACKENDS Result<void> initializeVegetationWind(VegetationWindState& state, glm::vec3 forward,
                                                                          float strength);
[[nodiscard]] EVENGINE_API_BACKENDS Result<void> advanceVegetationWind(VegetationWindState& state, glm::vec3 forward,
                                                                       float strength, float dt);
[[nodiscard]] EVENGINE_API_BACKENDS Result<glm::vec3> evaluateVegetationWind(const VegetationWindInput& input,
                                                                             const VegetationWindState& state);
}  // namespace eve::graphics