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      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 
     24 namespace android {
     25 namespace uirenderer {
     26 
     27 class SpotShadow {
     28 public:
     29     static void createSpotShadow(bool isCasterOpaque, const Vector3& lightCenter,
     30             float lightSize, const Vector3* poly, int polyLength,
     31             const Vector3& polyCentroid, VertexBuffer& retstrips);
     32 
     33 private:
     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