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TriangleStripBuilder: Moved to new source files; began transition to …
…an abstract class
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| #include "render/trianglestripbuilder.h" |
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| /** @file render/trianglestripbuilder.h Triangle Strip Geometry Builder. | ||
| * | ||
| * @authors Copyright © 2011-2013 Daniel Swanson <danij@dengine.net> | ||
| * | ||
| * @par License | ||
| * GPL: http://www.gnu.org/licenses/gpl.html | ||
| * | ||
| * <small>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 St, Fifth Floor, Boston, MA | ||
| * 02110-1301 USA</small> | ||
| */ | ||
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| #ifndef DENG_RENDER_TRIANGLE_STRIP_BUILDER | ||
| #define DENG_RENDER_TRIANGLE_STRIP_BUILDER | ||
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| #include <QVarLengthArray> /// @todo Remove me | ||
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| #include <de/libdeng2.h> | ||
| #include <de/Vector> | ||
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| #include "render/rendpoly.h" /// @todo Remove me | ||
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| namespace de { | ||
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| /** | ||
| * Abstract interface for a component that can be interpreted as an "edge" | ||
| * geometry. | ||
| */ | ||
| class IEdge | ||
| { | ||
| public: | ||
| class IIntercept | ||
| { | ||
| public: | ||
| virtual ~IIntercept() {} | ||
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| virtual bool operator < (IIntercept const &other) const { | ||
| return distance() < other.distance(); | ||
| } | ||
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| virtual coord_t distance() const = 0; | ||
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| virtual Vector3d origin() const = 0; | ||
| }; | ||
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| public: | ||
| virtual ~IEdge() {} | ||
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| virtual bool isValid() const = 0; | ||
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| virtual IIntercept const &from() const = 0; | ||
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| virtual IIntercept const &to() const = 0; | ||
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| virtual Vector2f const &materialOrigin() const = 0; | ||
| }; | ||
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| typedef QVarLengthArray<rvertex_t, 24> PositionBuffer; | ||
| typedef QVarLengthArray<rtexcoord_t, 24> TexCoordBuffer; | ||
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| /** | ||
| * Abstract triangle strip geometry builder. | ||
| * | ||
| * Encapsulates the logic of constructing triangle strip geometries. | ||
| * | ||
| * @ingroup render | ||
| * | ||
| * @todo Separate the backing store with an external allocator mechanism. | ||
| * (Geometry should not be owned by the builder.) | ||
| * @todo Support custom vertex types/do not depend on rvertex_t (etc...). | ||
| * (Once implemented move this component to libgui.) | ||
| * @todo Support building strips by adding single vertices. | ||
| */ | ||
| class TriangleStripBuilder | ||
| { | ||
| public: | ||
| /** | ||
| * Construct a new triangle strip builder. | ||
| * | ||
| * @param buildTexCoords @c true= construct texture coordinates also. | ||
| */ | ||
| TriangleStripBuilder(bool buildTexCoords = false); | ||
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| /** | ||
| * Begin construction of a new triangle strip geometry. Any existing unclaimed | ||
| * geometry is discarded. | ||
| * | ||
| * Vertex layout: | ||
| * 1--3 2--0 | ||
| * | | or | | if @a direction @c =Anticlockwise | ||
| * 0--2 3--1 | ||
| * | ||
| * @param direction Initial vertex winding direction. | ||
| * | ||
| * @param reserveElements Initial number of vertex elements to reserve. If the | ||
| * user knows in advance roughly how many elements are required for the geometry | ||
| * this number may be reserved from the outset, thereby improving performance | ||
| * by minimizing dynamic memory allocations. If the estimate is off the only | ||
| * side effect is reduced performance. | ||
| */ | ||
| void begin(ClockDirection direction, int reserveElements = 0); | ||
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| /** | ||
| * Submit an edge geometry to be added to the current triangle strip geometry. | ||
| * | ||
| * @param edge Edge geometry to add. | ||
| * | ||
| * @return Reference to this trangle strip builder. | ||
| */ | ||
| TriangleStripBuilder &operator << (IEdge &edge); | ||
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| /** | ||
| * Returns the total number of vertex elements in the current strip geometry. | ||
| * If no strip is currently being built @c 0 is returned. | ||
| */ | ||
| int numElements() const; | ||
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| /** | ||
| * Take ownership of the last built strip of geometry. | ||
| * | ||
| * @param positions The address of the buffer containing the vertex position | ||
| * values is written here. | ||
| * @param texcoords The address of the buffer containing the texture coord | ||
| * values is written here. Can be @c 0. | ||
| * | ||
| * @return Total number of vertex elements in the geometry (for convenience). | ||
| */ | ||
| int take(PositionBuffer **positions, TexCoordBuffer **texcoords = 0); | ||
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| private: | ||
| DENG2_PRIVATE(d) | ||
| }; | ||
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| } // namespace de | ||
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| #endif // DENG_RENDER_TRIANGLE_STRIP_BUILDER |
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