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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 
     23 namespace android {
     24 namespace uirenderer {
     25 
     26 class VertexBuffer;
     27 
     28 class SpotShadow {
     29 public:
     30     static void createSpotShadow(bool isCasterOpaque, const Vector3& lightCenter, float lightSize,
     31                                  const Vector3* poly, int polyLength, const Vector3& polyCentroid,
     32                                  VertexBuffer& retstrips);
     33 
     34 private:
     35     struct VertexAngleData;
     36 
     37     static float projectCasterToOutline(Vector2& outline, const Vector3& lightCenter,
     38                                         const Vector3& polyVertex);
     39 
     40     static void computeLightPolygon(int points, const Vector3& lightCenter, float size,
     41                                     Vector3* ret);
     42 
     43     static void smoothPolygon(int level, int rays, float* rayDist);
     44     static float rayIntersectPoly(const Vector2* poly, int polyLength, const Vector2& point,
     45                                   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 reverse(Vector2* polygon, int len);
     58 
     59     static void generateTriangleStrip(bool isCasterOpaque, float shadowStrengthScale,
     60                                       Vector2* penumbra, int penumbraLength, Vector2* umbra,
     61                                       int umbraLength, const Vector3* poly, int polyLength,
     62                                       VertexBuffer& retstrips, const Vector2& centroid);
     63 
     64 #if DEBUG_SHADOW
     65     static bool testConvex(const Vector2* polygon, int polygonLength, const char* name);
     66     static void testIntersection(const Vector2* poly1, int poly1Length, const Vector2* poly2,
     67                                  int poly2Length, const Vector2* intersection,
     68                                  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