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#include "VertexBuffer.h"
23
24namespace android {
25namespace uirenderer {
26
27class SpotShadow {
28public:
29    static void createSpotShadow(bool isCasterOpaque, const Vector3& lightCenter,
30            float lightSize, const Vector3* poly, int polyLength,
31            const Vector3& polyCentroid, VertexBuffer& retstrips);
32
33private:
34    struct VertexAngleData;
35
36    static float projectCasterToOutline(Vector2& outline,
37            const Vector3& lightCenter, const Vector3& polyVertex);
38
39    static void computeLightPolygon(int points, const Vector3& lightCenter,
40            float size, Vector3* ret);
41
42    static void smoothPolygon(int level, int rays, float* rayDist);
43    static float rayIntersectPoly(const Vector2* poly, int polyLength,
44            const Vector2& point, float dx, float dy);
45
46    static void xsort(Vector2* points, int pointsLength);
47    static int hull(Vector2* points, int pointsLength, Vector2* retPoly);
48    static bool ccw(float ax, float ay, float bx, float by, float cx, float cy);
49    static void sort(Vector2* poly, int polyLength, const Vector2& center);
50
51    static void swap(Vector2* points, int i, int j);
52    static void quicksortCirc(Vector2* points, int low, int high, const Vector2& center);
53    static void quicksortX(Vector2* points, int low, int high);
54
55    static bool testPointInsidePolygon(const Vector2 testPoint, const Vector2* poly, int len);
56    static void makeClockwise(Vector2* polygon, int len);
57    static void reverse(Vector2* polygon, int len);
58
59    static void generateTriangleStrip(bool isCasterOpaque, float shadowStrengthScale,
60            Vector2* penumbra, int penumbraLength, Vector2* umbra, int umbraLength,
61            const Vector3* poly, int polyLength, VertexBuffer& retstrips, const Vector2& centroid);
62
63#if DEBUG_SHADOW
64    static bool testConvex(const Vector2* polygon, int polygonLength,
65            const char* name);
66    static void testIntersection(const Vector2* poly1, int poly1Length,
67        const Vector2* poly2, int poly2Length,
68        const Vector2* intersection, int intersectionLength);
69    static void updateBound(const Vector2 inVector, Vector2& lowerBound, Vector2& upperBound );
70    static void dumpPolygon(const Vector2* poly, int polyLength, const char* polyName);
71    static void dumpPolygon(const Vector3* poly, int polyLength, const char* polyName);
72#endif
73
74}; // SpotShadow
75
76}; // namespace uirenderer
77}; // namespace android
78
79#endif // ANDROID_HWUI_SPOT_SHADOW_H
80