MeshEffect.h

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#pragma once
#include "common/Export.h"
 
 
#include "common/RuntimeHandle.h"
#include "stylize/StyleInstance.h"
 
#include <string>
 
namespace eve::graphics {
class Graphics;
class Shader;
}
 
namespace eve::stylize {
 
struct MeshEffectTargetTag;
using MeshEffectTargetHandle = eve::RuntimeHandle<MeshEffectTargetTag>;
 
enum class MeshEffectState { Stopped, FadingIn, Active, FadingOut, Finished };
 
struct MeshEffectPlayback {
    float fadeIn = 0.08f;
    float duration = 0.25f;
    float fadeOut = 0.12f;
    bool loop = false;
};
 
class EVENGINE_API_WORLD MeshEffectInstance {
public:
    explicit MeshEffectInstance(std::string style);
    MeshEffectInstance(std::string style, std::map<std::string, float> defaults);
 
    MeshEffectInstance(const MeshEffectInstance&) = delete;
    MeshEffectInstance& operator=(const MeshEffectInstance&) = delete;
 
    void bindTarget(MeshEffectTargetHandle target);
    void unbindTarget() noexcept;
    [[nodiscard]] MeshEffectTargetHandle target() const noexcept { return target_; }
    [[nodiscard]] bool isBound() const noexcept { return target_.isValid(); }
 
    void setPlayback(MeshEffectPlayback playback);
    [[nodiscard]] MeshEffectPlayback playback() const noexcept { return playback_; }
    void play() noexcept;
    void stop(float fadeOutSeconds = 0.f);
    void update(float dtSeconds);
 
    [[nodiscard]] MeshEffectState state() const noexcept { return state_; }
    [[nodiscard]] float elapsed() const noexcept { return elapsed_; }
    [[nodiscard]] float intensity() const noexcept;
    [[nodiscard]] StyleInstance& style() noexcept { return style_; }
    [[nodiscard]] const StyleInstance& style() const noexcept { return style_; }
 
    [[nodiscard]] graphics::Shader* newMeshShader(graphics::Graphics* gfx);
 
private:
    void updateTimelineState() noexcept;
    static void validateDuration(float value, const char* name);
 
    StyleInstance style_;
    MeshEffectTargetHandle target_;
    MeshEffectPlayback playback_;
    MeshEffectState state_ = MeshEffectState::Stopped;
    float elapsed_ = 0.f;
    float stopElapsed_ = 0.f;
    float stopDuration_ = 0.f;
    float stopStartIntensity_ = 0.f;
};
 
}  // namespace eve::stylize