texture.h

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// SPDX-License-Identifier: GPL-2.0-or-later
 
#ifndef INKSCAPE_UI_WIDGET_CANVAS_TEXTURE_H
#define INKSCAPE_UI_WIDGET_CANVAS_TEXTURE_H
 
#include <2geom/point.h>
#include <epoxy/gl.h>
 
namespace Inkscape::UI::Widget {
 
class Texture
{
public:
    // Create null texture owning no resources.
    Texture() = default;
 
    // Allocate a blank texture of a given size. The texture is bound to GL_TEXTURE_2D.
    Texture(Geom::IntPoint const &size);
 
    // Wrap an existing texture.
    Texture(GLuint id, Geom::IntPoint const &size) : _id(id), _size(size) {}
 
    // Boilerplate constructors/operators
    Texture(Texture &&other) noexcept { _movefrom(other); }
    Texture &operator=(Texture &&other) noexcept { _reset(); _movefrom(other); return *this; }
    ~Texture() { _reset(); }
 
    // Observers
    GLuint id() const { return _id; }
    Geom::IntPoint const &size() const { return _size; }
    explicit operator bool() const { return _id; }
 
    // Methods
    void clear() { _reset(); _id = 0; }
    void invalidate();
 
private:
    GLuint _id = 0;
    Geom::IntPoint _size;
 
    void _reset() noexcept { if (_id) glDeleteTextures(1, &_id); }
    void _movefrom(Texture &other) noexcept { _id = other._id; _size = other._size; other._id = 0; }
};
 
} // namespace Inkscape::UI::Widget
 
#endif // INKSCAPE_UI_WIDGET_CANVAS_TEXTURE_H
 
/*
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  End:
*/
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