shader.hpp

Go to the documentation of this file.

/*
   Copyright (C) 2014 - 2016 by Boldizsár Lipka <[email protected]>
   Part of the Battle for Wesnoth Project http://www.wesnoth.org/

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY.

   See the COPYING file for more details.
*/


#ifdef SDL_GPU

#include "gpu.hpp"
#include "image.hpp"
#include <string>
#include <vector>
#include <boost/noncopyable.hpp>
#include "exceptions.hpp"

#define SHADER_EFFECT_NONE 0
#define SHADER_EFFECT_FLIP 1
#define SHADER_EFFECT_FLOP 2
#define SHADER_EFFECT_GRAYSCALE 4

namespace sdl {

class timage;

class shader_program
{
public:
    shader_program(const std::string &vsrc, const std::string &fsrc);
    shader_program();
    ~shader_program();

    shader_program(const shader_program &prog);
    const shader_program& operator =(const shader_program &prog);

    void activate();
    void deactivate();

    void set_color_mod(int r, int g, int b, int a);
    void set_submerge(float val);
    void set_effects(int effects);
    void set_overlay(const sdl::timage &img);

private:
    Uint32 program_object_, vertex_object_, fragment_object_;
    GPU_ShaderBlock block_;
    int attr_color_mod_, attr_submerge_, attr_effects_;
    int uni_overlay_;
    // we need to retain a copy of the overlay texture to prevent it from
    // getting deleted
    sdl::timage overlay_image_;
    unsigned *refcount_;
};

class shader_error : public game::error
{
public:
    shader_error(const std::string &op);
};

}
#endif