auto import from //depot/cupcake/@135843

1 files changed, 51 insertions, 0 deletions

diff --git a/core/jni/android/opengl/poly.h b/core/jni/android/opengl/poly.h
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+++ b/core/jni/android/opengl/poly.h
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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