texture.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 GRAPHICS_OPENGL_TEXTURE_H
#define GRAPHICS_OPENGL_TEXTURE_H

#include "graphics/opengl/system_headers.h"
#include "graphics/opengl/context.h"

#include "graphics/pixelformat.h"
#include "graphics/surface.h"

#include "common/rect.h"
#include "common/rotationmode.h"

namespace OpenGL {

enum WrapMode {
    kWrapModeBorder,
    kWrapModeEdge,
    kWrapModeRepeat,
    kWrapModeMirroredRepeat
};

class Texture {
public:
    Texture(GLenum glIntFormat, GLenum glFormat, GLenum glType, bool autoCreate = true);
    ~Texture();

    void enableLinearFiltering(bool enable);

    bool isLinearFilteringEnabled() const { return (_glFilter == GL_LINEAR); }

    void setWrapMode(WrapMode wrapMode);

    void destroy();

    void create();

    bool bind() const;

    bool setSize(uint width, uint height);

    void setFlip(bool flip) { if (_flip != flip) { _flip = flip; computeTexCoords(); } }

    void setRotation(Common::RotationMode rotation) { if (_rotation != rotation) { _rotation = rotation; computeTexCoords(); } }

    void updateArea(const Common::Rect &area, const Graphics::Surface &src);

    uint getWidth() const { return _width; }

    uint getHeight() const { return _height; }

    uint getLogicalWidth() const { return _logicalWidth; }

    uint getLogicalHeight() const { return _logicalHeight; }

    const GLfloat *getTexCoords() const { return _texCoords; }

    GLuint getGLTexture() const { return _glTexture; }

    static inline const Graphics::PixelFormat getRGBPixelFormat() {
        return Graphics::PixelFormat::createFormatRGB24();
    }

    static inline const Graphics::PixelFormat getRGBAPixelFormat() {
        return Graphics::PixelFormat::createFormatRGBA32();
    }

    static inline const Graphics::PixelFormat getBGRAPixelFormat() {
        return Graphics::PixelFormat::createFormatBGRA32();
    }

protected:
    void computeTexCoords();

    const GLenum _glIntFormat;
    const GLenum _glFormat;
    const GLenum _glType;

    uint _width, _height;
    uint _logicalWidth, _logicalHeight;
    bool _flip;
    Common::RotationMode _rotation;

    GLfloat _texCoords[4*2];

    GLint _glFilter;

    GLuint _glTexture;
};

} // End of namespace OpenGL

#endif