93966d88ef
The SkLights class is intended to be passed to the drawLitAtlas call (and then on to SkLightingShader). This CL is calved off of https://codereview.chromium.org/1261433009/ (Add SkCanvas::drawLitAtlas call). GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1255133004 Review-Url: https://codereview.chromium.org/1255133004
87 lines
2.0 KiB
C++
87 lines
2.0 KiB
C++
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/*
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* Copyright 2015 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef SkLights_DEFINED
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#define SkLights_DEFINED
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#include "SkPoint3.h"
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#include "SkRefCnt.h"
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#include "../private/SkTDArray.h"
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class SK_API SkLights : public SkRefCnt {
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public:
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class Light {
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public:
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enum LightType {
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kAmbient_LightType, // only 'fColor' is used
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kDirectional_LightType
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};
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Light(const SkColor3f& color)
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: fType(kAmbient_LightType)
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, fColor(color) {
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fDirection.set(0.0f, 0.0f, 1.0f);
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}
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Light(const SkColor3f& color, const SkVector3& dir)
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: fType(kDirectional_LightType)
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, fColor(color)
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, fDirection(dir) {
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if (!fDirection.normalize()) {
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fDirection.set(0.0f, 0.0f, 1.0f);
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}
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}
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LightType type() const { return fType; }
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const SkColor3f& color() const { return fColor; }
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const SkVector3& dir() const {
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SkASSERT(kAmbient_LightType != fType);
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return fDirection;
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}
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private:
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LightType fType;
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SkColor3f fColor; // linear (unpremul) color. Range is 0..1 in each channel.
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SkVector3 fDirection; // direction towards the light (+Z is out of the screen).
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// If degenerate, it will be replaced with (0, 0, 1).
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};
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class Builder {
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public:
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Builder() : fLights(new SkLights) { }
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void add(const Light& light) {
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if (fLights) {
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*fLights->fLights.push() = light;
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}
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}
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const sk_sp<SkLights> finish() {
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return fLights;
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}
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private:
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sk_sp<SkLights> fLights;
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};
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int numLights() const {
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return fLights.count();
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}
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const Light& light(int index) const {
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return fLights[index];
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}
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private:
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SkLights() {}
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SkTDArray<Light> fLights;
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};
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#endif
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