1 /* 2 * Copyright 2015 Google Inc. 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8 #ifndef SkLightingShader_DEFINED 9 #define SkLightingShader_DEFINED 10 11 #include "SkLights.h" 12 #include "SkShader.h" 13 14 class SkBitmap; 15 class SkMatrix; 16 class SkNormalSource; 17 18 class SK_API SkLightingShader { 19 public: 20 /** Returns a shader that lights the shape, colored by the diffuseShader, using the 21 normals from normalSource, with the set of lights provided. 22 23 @param diffuseShader the shader that provides the colors. If nullptr, uses the paint's 24 color. 25 @param normalSource the source for the shape's normals. If nullptr, assumes straight 26 up normals (<0,0,1>). 27 @param lights the lights applied to the normals 28 29 The lighting equation is currently: 30 result = (LightColor * dot(Normal, LightDir) + AmbientColor) * DiffuseColor 31 32 */ 33 static sk_sp<SkShader> Make(sk_sp<SkShader> diffuseShader, sk_sp<SkNormalSource> normalSource, 34 sk_sp<SkLights> lights); 35 36 SK_DECLARE_FLATTENABLE_REGISTRAR_GROUP() 37 }; 38 39 #endif 40
