SpotShadow.h revision 9122b1b168d2a74d51517ed7282f4d6a8adea367 
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 int setupAngleList(VertexAngleData* angleDataList,
40            int polyLength, const Vector2* polygon, const Vector2& centroid,
41            bool isPenumbra, const char* name);
42
43    static int convertPolysToVerticesPerRay(
44            bool hasOccludedUmbraArea, const Vector2* poly2d, int polyLength,
45            const Vector2* umbra, int umbraLength, const Vector2* penumbra,
46            int penumbraLength, const Vector2& centroid,
47            Vector2* umbraVerticesPerRay, Vector2* penumbraVerticesPerRay,
48            Vector2* occludedUmbraVerticesPerRay);
49
50    static bool checkClockwise(int maxIndex, int listLength,
51            VertexAngleData* angleList, const char* name);
52
53    static void calculateDistanceCounter(bool needsOffsetToUmbra, int angleLength,
54            const VertexAngleData* allVerticesAngleData, int* distances);
55
56    static void mergeAngleList(int maxUmbraAngleIndex, int maxPenumbraAngleIndex,
57            const VertexAngleData* umbraAngleList, int umbraLength,
58            const VertexAngleData* penumbraAngleList, int penumbraLength,
59            VertexAngleData* allVerticesAngleData);
60
61    static int setupPolyAngleList(float* polyAngleList, int polyAngleLength,
62        const Vector2* poly2d, const Vector2& centroid);
63
64    static bool checkPolyClockwise(int polyAngleLength, int maxPolyAngleIndex,
65        const float* polyAngleList);
66
67    static int getEdgeStartIndex(const int* offsets, int rayIndex, int totalRayNumber,
68        const VertexAngleData* allVerticesAngleData);
69
70    static int getPolyEdgeStartIndex(int maxPolyAngleIndex, int polyLength,
71        const float* polyAngleList, float rayAngle);
72
73    static void computeLightPolygon(int points, const Vector3& lightCenter,
74            float size, Vector3* ret);
75
76    static void smoothPolygon(int level, int rays, float* rayDist);
77    static float rayIntersectPoly(const Vector2* poly, int polyLength,
78            const Vector2& point, float dx, float dy);
79
80    static void xsort(Vector2* points, int pointsLength);
81    static int hull(Vector2* points, int pointsLength, Vector2* retPoly);
82    static bool ccw(float ax, float ay, float bx, float by, float cx, float cy);
83    static void sort(Vector2* poly, int polyLength, const Vector2& center);
84
85    static void swap(Vector2* points, int i, int j);
86    static void quicksortCirc(Vector2* points, int low, int high, const Vector2& center);
87    static void quicksortX(Vector2* points, int low, int high);
88
89    static bool testPointInsidePolygon(const Vector2 testPoint, const Vector2* poly, int len);
90    static void makeClockwise(Vector2* polygon, int len);
91    static void reverse(Vector2* polygon, int len);
92
93    static void generateTriangleStrip(bool isCasterOpaque, float shadowStrengthScale,
94            Vector2* penumbra, int penumbraLength, Vector2* umbra, int umbraLength,
95            const Vector3* poly, int polyLength, VertexBuffer& retstrips, const Vector2& centroid);
96
97#if DEBUG_SHADOW
98    static bool testConvex(const Vector2* polygon, int polygonLength,
99            const char* name);
100    static void testIntersection(const Vector2* poly1, int poly1Length,
101        const Vector2* poly2, int poly2Length,
102        const Vector2* intersection, int intersectionLength);
103    static void updateBound(const Vector2 inVector, Vector2& lowerBound, Vector2& upperBound );
104    static void dumpPolygon(const Vector2* poly, int polyLength, const char* polyName);
105    static void dumpPolygon(const Vector3* poly, int polyLength, const char* polyName);
106#endif
107
108}; // SpotShadow
109
110}; // namespace uirenderer
111}; // namespace android
112
113#endif // ANDROID_HWUI_SPOT_SHADOW_H
114