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/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkLightingShader_DEFINED
#define SkLightingShader_DEFINED
#include "SkFlattenablePriv.h"
#include "SkLights.h"
#include "SkShader.h"
class SkBitmap;
class SkMatrix;
class SkNormalSource;
class SK_API SkLightingShader {
public:
/** Returns a shader that lights the shape, colored by the diffuseShader, using the
normals from normalSource, with the set of lights provided.
@param diffuseShader the shader that provides the colors. If nullptr, uses the paint's
color.
@param normalSource the source for the shape's normals. If nullptr, assumes straight
up normals (<0,0,1>).
@param lights the lights applied to the normals
The lighting equation is currently:
result = (LightColor * dot(Normal, LightDir) + AmbientColor) * DiffuseColor
*/
static sk_sp<SkShader> Make(sk_sp<SkShader> diffuseShader, sk_sp<SkNormalSource> normalSource,
sk_sp<SkLights> lights);
SK_DECLARE_FLATTENABLE_REGISTRAR_GROUP()
};
#endif
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