surfacerenderer.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 BACKENDS_GRAPHICS3D_OPENGL_SURFACE_RENDERER_H
#define BACKENDS_GRAPHICS3D_OPENGL_SURFACE_RENDERER_H

#include "math/rect2d.h"

#include "graphics/opengl/system_headers.h"

namespace OpenGL {

class Shader;
class TextureGL;

class SurfaceRenderer {
public:
    SurfaceRenderer();
    virtual ~SurfaceRenderer();

    virtual void prepareState() = 0;

    virtual void render(const TextureGL *tex, const Math::Rect2d &dest) = 0;

    virtual void restorePreviousState() = 0;

    void setFlipY(bool flipY);

    void enableAlphaBlending(bool enable);

protected:
    bool _flipY;
    bool _alphaBlending;
};

#if defined(USE_OPENGL_GAME)

class FixedSurfaceRenderer : public SurfaceRenderer {
public:
    virtual ~FixedSurfaceRenderer();

    // SurfaceRenderer API
    void prepareState() override;
    void render(const TextureGL *tex, const Math::Rect2d &dest) override;
    void restorePreviousState() override;
};

#endif

#if defined(USE_OPENGL_SHADERS)

class ShaderSurfaceRenderer : public SurfaceRenderer {
public:
    ShaderSurfaceRenderer();
    virtual ~ShaderSurfaceRenderer();

    // SurfaceRenderer API
    void prepareState() override;
    void render(const TextureGL *tex, const Math::Rect2d &dest) override;
    void restorePreviousState() override;

private:
    Shader *_boxShader;
    GLuint _boxVerticesVBO;
    GLboolean _prevStateDepthTest;
    GLboolean _prevStateDepthWriteMask;
    GLboolean _prevStateBlend;
    GLboolean _prevStateScissorTest;
    GLint _prevStateBlendSrcRGB;
    GLint _prevStateBlendDstRGB;
    GLint _prevStateBlendSrcAlpha;
    GLint _prevStateBlendDstAlpha;
    GLint _prevStateViewport[4];
};

#endif

SurfaceRenderer *createBestSurfaceRenderer();

} // End of namespace OpenGL

#endif // GRAPHICS_OPENGL_SURFACE_RENDERER_H