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, 31 float lightSize, const Vector3* poly, int polyLength, 32 const Vector3& polyCentroid, VertexBuffer& retstrips); 33 34 private: 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 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