godot/scene/resources/shader.h

/*************************************************************************/
/*  shader.h                                                             */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2018 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2018 Godot Engine contributors (cf. AUTHORS.md)    */
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#ifndef SHADER_H
#define SHADER_H

#include "io/resource_loader.h"
#include "resource.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