Add Geometries (replaces Quads).

A Geometry is a collection of vertices describing a non self-intersecting
(simple) polygon. In addition to screen coordinates, the vertices have
attributes for texture coordinates (s,t) and color (r,g,b,a).

It can be used as a quad, to display distorted images, or anything in between.

Added:
^^^^^^

-- geometry from table, where table has the format:
-- info = {
-- {x,y, s,t, [r = 255, g = 255, b = 255, a = 255]}
-- {x,y, s,t, [r = 255, g = 255, b = 255, a = 255]}
-- ...
-- }
geom = love.graphics.newGeometry(info)

-- convenience wrapper for quads (same as before)
geom = love.graphics.newQuad(x,y, w,h, sw,sh)

-- retrieve vertex i (1-indexed)
x,y,s,t,r,g,b,a = geom:getVertex(i)

-- set vertex i (1-indexed)
geom:setVertex(i, x,y, s,t, [r,g,b,a])

-- flip geometry
geom:flip(x, y)


Renamed:
^^^^^^^^

love.graphics.drawq() -> love.graphics.drawg()


Removed:
^^^^^^^^

quad:setViewport()
quad:getViewport()

src/modules/graphics/Geometry.h

@@ -0,0 +1,107 @@
+/**
+ * Copyright (c) 2006-2012 LOVE Development Team
+ *
+ * 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.
+ **/
+
+#ifndef LOVE_GRAPHICS_GEOMETRY_H
+#define LOVE_GRAPHICS_GEOMETRY_H
+
+// LOVE
+#include "common/Object.h"
+#include "common/math.h"
+
+// std
+#include <vector>
+
+namespace love
+{
+namespace graphics
+{
+
+class Geometry : public Object
+{
+public:
+	/**
+	 * Creates a new geometry object from a std::vector<vertex>.
+	 * @param v
+	 **/
+	Geometry(const std::vector<vertex> &polygon);
+
+	/**
+	 * Creates a new geometry from (texture) quad information.
+	 * @param x Top left position in the image.
+	 * @param y Top left position in the image.
+	 * @param w Width of the quad.
+	 * @param h Height of the quad.
+	 * @param sw The reference width, the width of the Image.
+	 * @param sh The reference height, the height of the Image.
+	 */
+	Geometry(float x, float y, float w, float h, float sw, float sh);
+
+	Geometry(const Geometry &other);
+	Geometry &operator=(const Geometry &other);
+	virtual ~Geometry();
+
+	/**
+	 * Returns number of vertices in the *polygon* defining the geometry.
+	 **/
+	size_t getNumVertices() const
+	{
+		return polygon.size();
+	}
+
+	const vertex &getVertex(size_t i) const;
+	void setVertex(size_t i, const vertex &v);
+
+	void flip(bool x, bool y);
+
+	/**
+	 * Returns a pointer to the vertex array.
+	 **/
+	const vertex *getVertexArray() const
+	{
+		return vertexArray;
+	}
+
+	/**
+	 * Returns the size of the vertex array.
+	 **/
+	size_t getVertexArraySize() const
+	{
+		return vertexCount;
+	}
+
+private:
+	void triangulate();
+
+	std::vector<vertex> polygon;
+
+	vertex *vertexArray;
+	size_t vertexCount;
+
+	float x_min;
+	float x_max;
+
+	float y_min;
+	float y_max;
+};
+
+} // graphics
+} // love
+
+#endif // LOVE_GRAPHICS_GEOMETRY_H