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src/global-ibo.h

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+/*
+** global-ibo.h
+**
+** This file is part of mkxp.
+**
+** Copyright (C) 2013 Jonas Kulla <Nyocurio@gmail.com>
+**
+** mkxp 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.
+**
+** mkxp 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 mkxp.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef GLOBALIBO_H
+#define GLOBALIBO_H
+
+#include <gl-util.h>
+#include <QVector>
+
+struct GlobalIBO
+{
+	IBO::ID ibo;
+	QVector<quint32> buffer;
+
+	GlobalIBO()
+	{
+		ibo = IBO::gen();
+	}
+
+	~GlobalIBO()
+	{
+		IBO::del(ibo);
+	}
+
+	void ensureSize(int quadCount)
+	{
+		if (buffer.size() >= quadCount*6)
+			return;
+
+		int startInd = buffer.size() / 6;
+		buffer.reserve(quadCount*6);
+
+		for (int i = startInd; i < quadCount; ++i)
+		{
+			static const int indTemp[] = { 0, 1, 2, 2, 3, 0 };
+
+			for (int j = 0; j < 6; ++j)
+				buffer.append(i * 4 + indTemp[j]);
+		}
+
+		IBO::bind(ibo);
+		IBO::uploadData(buffer.count() * sizeof(int),
+		                buffer.constData());
+		IBO::unbind();
+	}
+};
+
+#endif // GLOBALIBO_H