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/*
* Copyright (C) 2010-2025 by the Widelands Development Team
*
* 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 2
* 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 <https://www.gnu.org/licenses/>.
*
*/
#ifndef WL_GRAPHIC_BLEND_MODE_H
#define WL_GRAPHIC_BLEND_MODE_H
// Defines blending during blitting.
enum class BlendMode {
// Normal blending, equivalent to:
// glEnable(GL_BLEND);
// glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
// glBlendEquation(GL_FUNC_ADD);
Default,
// Perform a normal blitting operation that respects the alpha channel if
// present.
UseAlpha,
// Used internally for Surface::brighten_rect() if the rect is actually to
// be darkened.
Subtract,
// Copy all pixel information, including alpha channel information.
Copy,
};
#endif // end of include guard: WL_GRAPHIC_BLEND_MODE_H
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