Texture.h

/*
 * Gamedev Framework (gf)
 * Copyright (C) 2016-2021 Julien Bernard
 *
 * This software is provided 'as-is', without any express or implied
 * warranty.  In no event will the authors be held liable for any damages
 * arising from the use of this software.
 *
 * Permission is granted to anyone to use this software for any purpose,
 * including commercial applications, and to alter it and redistribute it
 * freely, subject to the following restrictions:
 *
 * 1. The origin of this software must not be misrepresented; you must not
 *    claim that you wrote the original software. If you use this software
 *    in a product, an acknowledgment in the product documentation would be
 *    appreciated but is not required.
 * 2. Altered source versions must be plainly marked as such, and must not be
 *    misrepresented as being the original software.
 * 3. This notice may not be removed or altered from any source distribution.
 *
 * Part of this file comes from SFML, with the same license:
 * Copyright (C) 2007-2015 Laurent Gomila (laurent@sfml-dev.org)
 */
#ifndef GF_TEXTURE_H
#define GF_TEXTURE_H

#include <cstdint>

#include "GraphicsApi.h"
#include "GraphicsHandle.h"
#include "Path.h"
#include "Rect.h"
#include "Span.h"
#include "Vector.h"

namespace gf {
#ifndef DOXYGEN_SHOULD_SKIP_THIS
inline namespace v1 {
#endif

  class Image;
  class InputStream;

  template<>
  struct GF_GRAPHICS_API GraphicsTrait<GraphicsTag::Texture> {
    static void gen(int n, unsigned* resources);
    static void del(int n, const unsigned* resources);
  };

  class GF_GRAPHICS_API BareTexture {
  public:
    enum class Format {
      Color, 
      Alpha, 
    };

    BareTexture(Format format);

    BareTexture(Format format, Vector2i size, const uint8_t *data);

    Format getFormat() const {
      return m_format;
    }

    unsigned getName() const {
      return m_handle.getName();
    }

    Vector2i getSize() const {
      return m_size;
    }

    void setSmooth(bool smooth = true);

    bool isSmooth() const noexcept {
      return m_smooth;
    }

    void setRepeated(bool repeated = true);

    bool isRepeated() const noexcept {
      return m_repeated;
    }

    void update(const uint8_t *data);

    void update(const uint8_t *data, const RectI& rect);

    void resize(Vector2i size, const uint8_t *data = nullptr);

    RectF computeTextureCoords(const RectI& rect) const;

    bool generateMipmap();

    static void bind(const BareTexture *texture);

  private:
    Format m_format;
    GraphicsHandle<GraphicsTag::Texture> m_handle;
    Vector2i m_size;
    bool m_smooth;
    bool m_repeated;
    bool m_mipmap;
  };


  class GF_GRAPHICS_API Texture : public BareTexture {
  public:
    Texture();

    Texture(Vector2i size);

    Texture(const Image& image);

    Texture(const Path& filename);

    Texture(InputStream& stream);

    Texture(Span<const uint8_t> content);

    void update(const Image& image);

    Image copyToImage() const;

  };


  class GF_GRAPHICS_API AlphaTexture : public BareTexture {
  public:
    AlphaTexture();

    AlphaTexture(Vector2i size);
  };

#ifndef DOXYGEN_SHOULD_SKIP_THIS
}
#endif
}

#endif // GF_TEXTURE_H