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/*
**
** Copyright 2007, The Android Open Source Project
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
** http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/
/* Based on the public domain code:
* Generic Convex Polygon Scan Conversion and Clipping
* by Paul Heckbert
* from "Graphics Gems", Academic Press, 1990
*/
#ifndef POLY_HDR
#define POLY_HDR
namespace android {
#define POLY_NMAX 10 /* max #sides to a polygon; change if needed */
/* note that poly_clip, given an n-gon as input, might output an (n+6)gon */
/* POLY_NMAX=10 is thus appropriate if input polygons are triangles or quads */
typedef struct { /* A POLYGON VERTEX */
float sx, sy, sz, sw; /* screen space position (sometimes homo.) */
} Poly_vert;
typedef struct { /* A POLYGON */
int n; /* number of sides */
Poly_vert vert[POLY_NMAX]; /* vertices */
} Poly;
#define POLY_CLIP_OUT 0 /* polygon entirely outside box */
#define POLY_CLIP_PARTIAL 1 /* polygon partially inside */
#define POLY_CLIP_IN 2 /* polygon entirely inside box */
int poly_clip_to_frustum(Poly *p1);
} // namespace android
#endif
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