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/*
* Copyright 2016 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkNormalSource_DEFINED
#define SkNormalSource_DEFINED
#include "SkFlattenable.h"
/** Abstract class that generates or reads in normals for use by SkLightingShader. Not to be
used as part of the API yet. Used internally by SkLightingShader.
*/
class SK_API SkNormalSource : public SkFlattenable {
public:
virtual ~SkNormalSource() override;
#if SK_SUPPORT_GPU
/** Returns a fragment processor that takes no input and outputs a normal (already rotated)
as its output color. To be used as a child fragment processor.
*/
virtual sk_sp<GrFragmentProcessor> asFragmentProcessor(
GrContext* context,
const SkMatrix& viewM,
const SkMatrix* localMatrix,
SkFilterQuality filterQuality,
SkSourceGammaTreatment gammaTreatment) const = 0;
#endif
class Provider {
public:
virtual ~Provider() {};
/** Called for each span of the object being drawn on the CPU. Your subclass should set
the appropriate normals that correspond to the specified device coordinates.
*/
virtual void fillScanLine(int x, int y, SkPoint3 output[], int count) const = 0;
};
/** Returns an instance of 'Provider' that provides normals for the CPU pipeline. The
necessary data will be initialized in place at 'storage'.
*/
virtual Provider* asProvider(const SkShader::ContextRec&, void* storage) const = 0;
/** Amount of memory needed to store a provider object and its dependencies.
*/
virtual size_t providerSize(const SkShader::ContextRec&) const = 0;
/** Returns a normal source that provides normals sourced from the the normal map argument.
Not to be used as part of the API yet. Used internally by SkLightingShader.
@param map a shader that outputs the normal map
@param normRotation rotation applied to the normal map's normals, in the
[cos a, sin a] form.
nullptr will be returned if 'map' is null
The normal map is currently assumed to be an 8888 image where the normal at a texel
is retrieved by:
N.x = R-127;
N.y = G-127;
N.z = B-127;
N.normalize();
The +Z axis is thus encoded in RGB as (127, 127, 255) while the -Z axis is
(127, 127, 0).
*/
static sk_sp<SkNormalSource> MakeFromNormalMap(sk_sp<SkShader> map,
const SkVector& normRotation);
SK_DEFINE_FLATTENABLE_TYPE(SkNormalSource)
SK_DECLARE_FLATTENABLE_REGISTRAR_GROUP()
};
#endif
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