light.h

/*************************************************************************/
/*  light.h                                                              */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2016 Juan Linietsky, Ariel Manzur.                 */
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/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the       */
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/* distribute, sublicense, and/or sell copies of the Software, and to    */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
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/*************************************************************************/
#ifndef LIGHT_H
#define LIGHT_H


#include "scene/3d/visual_instance.h"
#include "scene/resources/texture.h"
#include "servers/visual_server.h"

class Light : public VisualInstance {

    OBJ_TYPE( Light, VisualInstance );
    OBJ_CATEGORY("3D Light Nodes");

public:

    enum Parameter {
        PARAM_RADIUS=VisualServer::LIGHT_PARAM_RADIUS,
        PARAM_ENERGY=VisualServer::LIGHT_PARAM_ENERGY,
        PARAM_ATTENUATION=VisualServer::LIGHT_PARAM_ATTENUATION,
        PARAM_SPOT_ANGLE=VisualServer::LIGHT_PARAM_SPOT_ANGLE,
        PARAM_SPOT_ATTENUATION=VisualServer::LIGHT_PARAM_SPOT_ATTENUATION,
        PARAM_SHADOW_DARKENING=VisualServer::LIGHT_PARAM_SHADOW_DARKENING,
        PARAM_SHADOW_Z_OFFSET=VisualServer::LIGHT_PARAM_SHADOW_Z_OFFSET,
        PARAM_SHADOW_Z_SLOPE_SCALE=VisualServer::LIGHT_PARAM_SHADOW_Z_SLOPE_SCALE,
        PARAM_SHADOW_ESM_MULTIPLIER=VisualServer::LIGHT_PARAM_SHADOW_ESM_MULTIPLIER,
        PARAM_SHADOW_BLUR_PASSES=VisualServer::LIGHT_PARAM_SHADOW_BLUR_PASSES,
        PARAM_MAX=VisualServer::LIGHT_PARAM_MAX
    };


    enum LightColor {

        COLOR_DIFFUSE=VisualServer::LIGHT_COLOR_DIFFUSE,
        COLOR_SPECULAR=VisualServer::LIGHT_COLOR_SPECULAR
    };

    enum BakeMode {

        BAKE_MODE_DISABLED,
        BAKE_MODE_INDIRECT,
        BAKE_MODE_INDIRECT_AND_SHADOWS,
        BAKE_MODE_FULL

    };


    enum Operator {

        OPERATOR_ADD,
        OPERATOR_SUB
    };
private:


    Ref<Texture> projector;
    float vars[PARAM_MAX];
    Color colors[3];


    BakeMode bake_mode;
    VisualServer::LightType type;
    bool shadows;
    bool enabled;
    bool editor_only;
    Operator op;

    void _update_visibility();
// bind helpers

protected:

    RID light;

    virtual bool _can_gizmo_scale() const;
    virtual RES _get_gizmo_geometry() const;

    static void _bind_methods();
    void _notification(int p_what);


    Light(VisualServer::LightType p_type);
public:

    VS::LightType get_light_type() const { return type; }

    void set_parameter(Parameter p_var, float p_value);
    float get_parameter(Parameter p_var) const;

    void set_color(LightColor p_color,const Color& p_value);
    Color get_color(LightColor p_color) const;

    void set_project_shadows(bool p_enabled);
    bool has_project_shadows() const;

    void set_projector(const Ref<Texture>& p_projector);
    Ref<Texture> get_projector() const;

    void set_operator(Operator p_op);
    Operator get_operator() const;

    void set_bake_mode(BakeMode p_bake_mode);
    BakeMode get_bake_mode() const;

    void set_enabled(bool p_enabled);
    bool is_enabled() const;

    void set_editor_only(bool p_editor_only);
    bool is_editor_only() const;

    virtual AABB get_aabb() const;
    virtual DVector<Face3> get_faces(uint32_t p_usage_flags) const;

    void approximate_opengl_attenuation(float p_constant, float p_linear, float p_quadratic, float p_radius_treshold=0.5);

    Light();
    ~Light();

};

VARIANT_ENUM_CAST( Light::Parameter );
VARIANT_ENUM_CAST( Light::LightColor );
VARIANT_ENUM_CAST( Light::Operator );
VARIANT_ENUM_CAST( Light::BakeMode);


class DirectionalLight : public Light {

    OBJ_TYPE( DirectionalLight, Light );

public:

    enum ShadowMode {
        SHADOW_ORTHOGONAL,
        SHADOW_PERSPECTIVE,
        SHADOW_PARALLEL_2_SPLITS,
        SHADOW_PARALLEL_4_SPLITS
    };
    enum ShadowParam {
        SHADOW_PARAM_MAX_DISTANCE,
        SHADOW_PARAM_PSSM_SPLIT_WEIGHT,
        SHADOW_PARAM_PSSM_ZOFFSET_SCALE
    };

private:
    ShadowMode shadow_mode;
    float shadow_param[3];
protected:
    static void _bind_methods();
public:

    void set_shadow_mode(ShadowMode p_mode);
    ShadowMode get_shadow_mode() const;

    void set_shadow_max_distance(float p_distance);
    float get_shadow_max_distance() const;
    void set_shadow_param(ShadowParam p_param, float p_value);
    float get_shadow_param(ShadowParam p_param) const;

    DirectionalLight();
};

VARIANT_ENUM_CAST( DirectionalLight::ShadowMode );
VARIANT_ENUM_CAST( DirectionalLight::ShadowParam );


class OmniLight : public Light {

    OBJ_TYPE( OmniLight, Light );
protected:
    static void _bind_methods();

public:


    OmniLight() : Light( VisualServer::LIGHT_OMNI ) { set_parameter(PARAM_SHADOW_Z_OFFSET,0.001);}
};

class SpotLight : public Light {

    OBJ_TYPE( SpotLight, Light );
protected:
    static void _bind_methods();
public:


    SpotLight() : Light( VisualServer::LIGHT_SPOT ) {}
};


#endif