OPENGL: Merged from trunk, from rev 52105 to 53396.

This includes an rather hacky attempt to merge all the recent gp2x backend
changes into the branch. I suppose the gp2x backend and probably all new
backends, i.e. gph, dingux etc., might not compile anymore.

Since I have no way of testing those it would be nice if porters could look
into getting those up to speed in this branch.

svn-id: r53399

1 files changed, 180 insertions, 0 deletions

diff --git a/engines/sword25/math/vertex.h b/engines/sword25/math/vertex.h
new file mode 100644
index 0000000000..87e4694d48
--- /dev/null
+++ b/engines/sword25/math/vertex.h
@@ -0,0 +1,180 @@
+/* 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 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * $URL$
+ * $Id$
+ *
+ */
+
+/*
+ * This code is based on Broken Sword 2.5 engine
+ *
+ * Copyright (c) Malte Thiesen, Daniel Queteschiner and Michael Elsdoerfer
+ *
+ * Licensed under GNU GPL v2
+ *
+ */
+
+/*
+    BS_Vertex
+    ---------
+
+    Autor: Malte Thiesen
+*/
+
+#ifndef SWORD25_VERTEX_H
+#define SWORD25_VERTEX_H
+
+// Includes
+#include <math.h>
+#include "sword25/kernel/common.h"
+
+namespace Lua {
+
+// Forward declarations
+struct lua_State;
+
+}
+
+using namespace Lua;
+
+namespace Sword25 {
+
+/**
+ * Defines a 2-D Vertex
+ */
+class Vertex {
+public:
+	Vertex() : x(0), y(0) {};
+	Vertex(int x_, int y_) {
+		this->x = x_;
+		this->y = y_;
+	}
+
+	int x;
+	int y;
+
+	/**
+	 * Compares two Vertecies.
+	 */
+	inline bool operator==(const Vertex &rhs) const {
+		if (x == rhs.x && y == rhs.y) return true;
+		return false;
+	}
+	/**
+	 * Compares two Vertecies.
+	 */
+	inline bool operator!=(const Vertex &rhs) const {
+		if (x != rhs.x || y != rhs.y) return true;
+		return false;
+	}
+	/**
+	 * Adds a vertex to vertex
+	 */
+	inline void operator+=(const Vertex &delta) {
+		x += delta.x;
+		y += delta.y;
+	}
+
+	/**
+	 * Subtracts a vertex from a vertex
+	 */
+	inline void operator-=(const Vertex &delta) {
+		x -= delta.x;
+		y -= delta.y;
+	}
+
+	/**
+	 * Adds two vertecies
+	 */
+	inline Vertex operator+(const Vertex &delta) const {
+		return Vertex(x + delta.x, y + delta.y);
+	}
+
+	/**
+	 * Subtracts two vertecies
+	 */
+	inline Vertex operator-(const Vertex &delta) const {
+		return Vertex(x - delta.x, y - delta.y);
+	}
+
+	/**
+	 * Calculates the square of the distance between two Vertecies.
+	 * @param Vertex        The vertex for which the distance is to be calculated
+	 * @return              Returns the square of the distance between itself and the passed vertex
+	 * @remark              If only distances should be compared, this method should be used because
+	 * it is faster than Distance()
+	 */
+	inline int distance2(const Vertex &vertex) const {
+		return (x - vertex.x) * (x - vertex.x) + (y - vertex.y) * (y - vertex.y);
+	}
+
+	/**
+	 * Calculates the square of the distance between two Vertecies.
+	 * @param Vertex        The vertex for which the distance is to be calculated
+	 * @return              Returns the square of the distance between itself and the passed vertex
+	 * @remark              If only distances should be compared, Distance2() should be used, since it is faster.
+	 */
+	inline int distance(const Vertex &vertex) const {
+		return (int)(sqrtf(static_cast<float>(distance2(vertex))) + 0.5);
+	}
+
+	/**
+	 * Calculates the cross product of the vertex with another vertex. Here the Vertecies will be
+	 * interpreted as vectors.
+	 * @param Vertex        The second vertex
+	 * @return              Returns the cross product of this vertex and the passed vertex.
+	 */
+	inline int computeCrossProduct(const Vertex &vertex) const {
+		return x * vertex.y - vertex.x * y;
+	}
+
+	/**
+	 * Returns the dot product of this vertex with another vertex. Here the Vertecies are interpreted as vectors.
+	 * @param Vertex        The second vertex
+	 * @return              Returns the dot product of this vertex and the passed vertex.
+	 */
+	inline int computeDotProduct(const Vertex &vertex) const {
+		return x * vertex.x + y * vertex.y;
+	}
+
+	/**
+	 * Calculates the angle between this vertex and another vertex. Here the Vertecies are interpreted as vectors.
+	 * @param Vertex        The second vertex
+	 * @return              Returns the angle between this vertex and the passed vertex in radians.
+	 */
+	inline float computeAngle(const Vertex &vertex) const {
+		return atan2f(static_cast<float>(computeCrossProduct(vertex)), static_cast<float>(computeDotProduct(vertex)));
+	}
+
+	/**
+	 * Calculates the length of the vector
+	 */
+	inline float computeLength() const {
+		return sqrtf(static_cast<float>(x * x + y * y));
+	}
+
+	static Vertex &luaVertexToVertex(lua_State *L, int StackIndex, Vertex &vertex);
+	static void vertexToLuaVertex(lua_State *L, const Vertex &vertex);
+};
+
+} // End of namespace Sword25
+
+#endif