shader.h

/*************************************************************************/
/*  shader.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 above copyright notice and this permission notice shall be        */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
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/*************************************************************************/
#ifndef SHADER_H
#define SHADER_H

#include "resource.h"
#include "io/resource_loader.h"
#include "scene/resources/texture.h"
class Shader : public Resource {

    OBJ_TYPE(Shader,Resource);
    OBJ_SAVE_TYPE( Shader );
    RES_BASE_EXTENSION("shd");

public:
    enum Mode {

        MODE_MATERIAL,
        MODE_CANVAS_ITEM,
        MODE_POST_PROCESS,
        MODE_MAX
    };
private:
    RID shader;
    Mode mode;
    Dictionary _get_code();
    void _set_code(const Dictionary& p_string);


    // hack the name of performance
    // shaders keep a list of ShaderMaterial -> VisualServer name translations, to make
    // convertion fast and save memory.
    mutable bool params_cache_dirty;
    mutable Map<StringName,StringName> params_cache; //map a shader param to a material param..
    Map<StringName,Ref<Texture> > default_textures;



protected:



    static void _bind_methods();
public:


    //void set_mode(Mode p_mode);
    Mode get_mode() const;

    void set_code( const String& p_vertex, const String& p_fragment, const String& p_light,int p_fragment_ofs=0,int p_light_ofs=0);
    String get_vertex_code() const;
    String get_fragment_code() const;
    String get_light_code() const;

    void get_param_list(List<PropertyInfo> *p_params) const;
    bool has_param(const StringName& p_param) const;

    void set_default_texture_param(const StringName& p_param, const Ref<Texture> &p_texture);
    Ref<Texture> get_default_texture_param(const StringName& p_param) const;
    void get_default_texture_param_list(List<StringName>* r_textures) const;

    _FORCE_INLINE_ StringName remap_param(const StringName& p_param) const {
        if (params_cache_dirty)
            get_param_list(NULL);

        const Map<StringName,StringName>::Element *E=params_cache.find(p_param);
        if (E)
            return E->get();
        return StringName();
    }

    virtual RID get_rid() const;

    Shader(Mode p_mode);
    ~Shader();

};

VARIANT_ENUM_CAST( Shader::Mode );

class MaterialShader : public Shader {

    OBJ_TYPE(MaterialShader,Shader);

public:

    MaterialShader() : Shader(MODE_MATERIAL) {};
};

class CanvasItemShader : public Shader {

    OBJ_TYPE(CanvasItemShader,Shader);

public:

    CanvasItemShader() : Shader(MODE_CANVAS_ITEM) {};
};



class ResourceFormatLoaderShader : public ResourceFormatLoader {
public:
    virtual RES load(const String &p_path,const String& p_original_path="",Error *r_error=NULL);
    virtual void get_recognized_extensions(List<String> *p_extensions) const;
    virtual bool handles_type(const String& p_type) const;
    virtual String get_resource_type(const String &p_path) const;
};



#endif // SHADER_H