opengls.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 STARK_GFX_OPENGLS_H
#define STARK_GFX_OPENGLS_H

#include "common/system.h"

#if defined(USE_OPENGL_SHADERS)

#include "engines/stark/gfx/driver.h"

#include "graphics/opengl/system_headers.h"

namespace OpenGL {
class Shader;
}

namespace Stark {
namespace Gfx {

class OpenGLSDriver : public Driver {
public:
    OpenGLSDriver();
    ~OpenGLSDriver();

    void init() override;

    void setScreenViewport(bool noScaling) override;
    void setViewport(const Common::Rect &rect) override;

    void clearScreen() override;
    void flipBuffer() override;

    Texture *createTexture() override;
    Bitmap *createBitmap(const Graphics::Surface *surface = nullptr, const byte *palette = nullptr) override;
    VisualActor *createActorRenderer() override;
    VisualProp *createPropRenderer() override;
    SurfaceRenderer *createSurfaceRenderer() override;
    FadeRenderer *createFadeRenderer() override;

    OpenGL::Shader *createActorShaderInstance();
    OpenGL::Shader *createSurfaceShaderInstance();
    OpenGL::Shader *createSurfaceFillShaderInstance();
    OpenGL::Shader *createFadeShaderInstance();
    OpenGL::Shader *createShadowShaderInstance();

    void start2DMode();
    void end2DMode();
    void set3DMode() override;
    bool computeLightsEnabled() override;

    Common::Rect getViewport() const;
    Common::Rect getUnscaledViewport() const;

    Graphics::Surface *getViewportScreenshot() const override;

private:
    Common::Rect _viewport;
    Common::Rect _unscaledViewport;

    OpenGL::Shader *_surfaceShader;
    OpenGL::Shader *_surfaceFillShader;
    OpenGL::Shader *_actorShader;
    OpenGL::Shader *_fadeShader;
    OpenGL::Shader *_shadowShader;
    GLuint _surfaceVBO;
    GLuint _fadeVBO;
};

} // End of namespace Gfx
} // End of namespace Stark

#endif // defined(USE_OPENGL_SHADERS)

#endif // STARK_GFX_OPENGLS_H