| /* |
| ** |
| ** 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 |
