shaders.h

/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * 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 3 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; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

#ifndef TWP_SHADERS_H
#define TWP_SHADERS_H

#include "twp/room.h"
#include "math/vector3d.h"

namespace Twp {

extern const char *vsrc;
extern const char *bwShader;
extern const char *ghostShader;
extern const char *sepiaShader;

struct ShaderParams {
    RoomEffect effect = RoomEffect::None;
    float sepiaFlicker = 1.f;
    float randomValue[5] = {0.f, 0.f, 0.f, 0.f, 0.f};
    float timeLapse = 0.f;
    float iGlobalTime = 0.f;
    float iNoiseThreshold = 1.f;
    float iFade = 1.f;
    float wobbleIntensity = 1.f;
    Color shadows = Color(-0.3f, 0.f, 0.f);
    Color midtones = Color(-0.2f, 0.f, 0.1f);
    Color highlights = Color(0.f, 0.f, 0.2f);

    void updateShader();
};

enum class FadeEffect {
    None,
    In,
    Out,
    Wobble
};

class FadeShader : public Shader {
public:
    FadeShader();
    virtual ~FadeShader() override;

    int getNumTextures() override;
    int getTexture(int index) override;
    int getTextureLoc(int index) override;

private:
    void applyUniforms() override;

public:
    FadeEffect _effect = FadeEffect::None;
    Common::SharedPtr<Room> _room;
    Texture *_texture1 = nullptr;
    Texture *_texture2 = nullptr;
    Math::Vector2d _cameraPos;
    float _duration = 0.f;
    float _elapsed = 0.f;
    float _movement = 0.f;     // movement for wobble effect
    float _fade = 0.f;         // fade value between [0.f,1.f]
    bool _fadeToSepia = false; // true to fade to sepia

private:
    int _textureLoc[2];
};

} // namespace Twp

#endif