gfx_opengl_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 GFX_OPENGL_SHADERS_H_
#define GFX_OPENGL_SHADERS_H_

#include "common/rect.h"

#include "math/rect2d.h"

#include "graphics/opengl/shader.h"

#include "engines/myst3/gfx.h"

namespace Myst3 {

class ShaderRenderer : public Renderer {
public:
    ShaderRenderer(OSystem *_system);
    virtual ~ShaderRenderer();

    void init() override;

    void clear() override;
    void selectTargetWindow(Window *window, bool is3D, bool scaled) override;

    Texture *createTexture3D(const Graphics::Surface *surface) override;

    void drawRect2D(const Common::Rect &rect, uint8 a, uint8 r, uint8 g, uint8 b) override;
    virtual void drawTexturedRect2D(const Common::Rect &screenRect, const Common::Rect &textureRect, Texture *texture,
                                    float transparency = -1.0, bool additiveBlending = false) override;
    virtual void drawTexturedRect3D(const Math::Vector3d &topLeft, const Math::Vector3d &bottomLeft,
                                    const Math::Vector3d &topRight, const Math::Vector3d &bottomRight,
                                    Texture *texture) override;

    void drawCube(Texture **textures) override;
    void draw2DText(const Common::String &text, const Common::Point &position) override;

    Graphics::Surface *getScreenshot() override;
    Texture *copyScreenshotToTexture() override;

private:
    void setupQuadEBO();
    Math::Vector2d scaled(float x, float y) const;

    OpenGL::Shader *_boxShader;
    OpenGL::Shader *_cubeShader;
    OpenGL::Shader *_rect3dShader;
    OpenGL::Shader *_textShader;

    GLuint _boxVBO;
    GLuint _cubeVBO;
    GLuint _rect3dVBO;
    GLuint _textVBO;
    GLuint _quadEBO;

    Common::Rect _currentViewport;

    Common::String _prevText;
    Common::Point _prevTextPosition;
};

} // End of namespace Myst3

#endif