1/*
2 * Copyright (C) 2014 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#ifndef ANDROID_HWUI_SPOT_SHADOW_H
18#define ANDROID_HWUI_SPOT_SHADOW_H
19
20#include "Debug.h"
21#include "Vector.h"
22
23namespace android {
24namespace uirenderer {
25
26class VertexBuffer;
27
28class SpotShadow {
29public:
30    static void createSpotShadow(bool isCasterOpaque, const Vector3& lightCenter,
31            float lightSize, const Vector3* poly, int polyLength,
32            const Vector3& polyCentroid, VertexBuffer& retstrips);
33
34private:
35    struct VertexAngleData;
36
37    static float projectCasterToOutline(Vector2& outline,
38            const Vector3& lightCenter, const Vector3& polyVertex);
39
40    static void computeLightPolygon(int points, const Vector3& lightCenter,
41            float size, Vector3* ret);
42
43    static void smoothPolygon(int level, int rays, float* rayDist);
44    static float rayIntersectPoly(const Vector2* poly, int polyLength,
45            const Vector2& point, float dx, float dy);
46
47    static void xsort(Vector2* points, int pointsLength);
48    static int hull(Vector2* points, int pointsLength, Vector2* retPoly);
49    static bool ccw(float ax, float ay, float bx, float by, float cx, float cy);
50    static void sort(Vector2* poly, int polyLength, const Vector2& center);
51
52    static void swap(Vector2* points, int i, int j);
53    static void quicksortCirc(Vector2* points, int low, int high, const Vector2& center);
54    static void quicksortX(Vector2* points, int low, int high);
55
56    static bool testPointInsidePolygon(const Vector2 testPoint, const Vector2* poly, int len);
57    static void makeClockwise(Vector2* polygon, int len);
58    static void reverse(Vector2* polygon, int len);
59
60    static void generateTriangleStrip(bool isCasterOpaque, float shadowStrengthScale,
61            Vector2* penumbra, int penumbraLength, Vector2* umbra, int umbraLength,
62            const Vector3* poly, int polyLength, VertexBuffer& retstrips, const Vector2& centroid);
63
64#if DEBUG_SHADOW
65    static bool testConvex(const Vector2* polygon, int polygonLength,
66            const char* name);
67    static void testIntersection(const Vector2* poly1, int poly1Length,
68        const Vector2* poly2, int poly2Length,
69        const Vector2* intersection, int intersectionLength);
70    static void updateBound(const Vector2 inVector, Vector2& lowerBound, Vector2& upperBound );
71    static void dumpPolygon(const Vector2* poly, int polyLength, const char* polyName);
72    static void dumpPolygon(const Vector3* poly, int polyLength, const char* polyName);
73#endif
74
75}; // SpotShadow
76
77}; // namespace uirenderer
78}; // namespace android
79
80#endif // ANDROID_HWUI_SPOT_SHADOW_H
81