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Add material shadows sample.

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Duplicates one of their elevation references.

Bug: skia:10781
Change-Id: I89b64807baed6742d3c4b0a5712078e01b44e0d8
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/345421
Commit-Queue: Jim Van Verth <jvanverth@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
This commit is contained in:
Jim Van Verth 2020-12-17 16:23:45 -05:00 committed by Skia Commit-Bot
parent 172ba9e276
commit c819bb16ee
2 changed files with 148 additions and 0 deletions
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1
gn/samples.gni
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@ -58,6 +58,7 @@ samples_sources = [
"$_samplecode/SampleLayerMask.cpp",
"$_samplecode/SampleLayers.cpp",
"$_samplecode/SampleManyRects.cpp",
"$_samplecode/SampleMaterialShadows.cpp",
"$_samplecode/SampleMegaStroke.cpp",
"$_samplecode/SampleMixer.cpp",
"$_samplecode/SamplePatch.cpp",

147
samplecode/SampleMaterialShadows.cpp Normal file
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@ -0,0 +1,147 @@
/*
* Copyright 2020 Google LLC
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "include/core/SkCanvas.h"
#include "include/core/SkColorFilter.h"
#include "include/core/SkPath.h"
#include "include/core/SkPoint3.h"
#include "include/pathops/SkPathOps.h"
#include "include/utils/SkCamera.h"
#include "include/utils/SkShadowUtils.h"
#include "samplecode/Sample.h"
#include "src/core/SkBlurMask.h"
#include "src/utils/SkUTF.h"
#include "tools/ToolUtils.h"
#include "tools/timer/TimeUtils.h"
////////////////////////////////////////////////////////////////////////////
class MaterialShadowsView : public Sample {
SkPath fCirclePath;
SkPath fCapsulePath;
SkPath fLargeRRPath;
SkPath fSmallRRPath;
SkPoint3 fLightPos;
void onOnceBeforeDraw() override {
fCirclePath.addCircle(0, 0, 56/2);
fCapsulePath.addRRect(SkRRect::MakeRectXY(SkRect::MakeXYWH(-64, -24, 128, 48), 24, 24));
fLargeRRPath.addRRect(SkRRect::MakeRectXY(SkRect::MakeXYWH(-64, -64, 128, 128), 4, 4));
fSmallRRPath.addRRect(SkRRect::MakeRectXY(SkRect::MakeXYWH(-40, -40, 80, 80), 4, 4));
fLightPos = SkPoint3::Make(0, -700, 600);
}
SkString name() override { return SkString("MaterialShadows"); }
void drawShadowedPath(SkCanvas* canvas, const SkPath& path,
const SkPoint3& zPlaneParams,
const SkPaint& paint, SkScalar ambientAlpha,
const SkPoint3& lightPos, SkScalar lightRadius, SkScalar spotAlpha) {
uint32_t flags = 0;
flags |= SkShadowFlags::kDirectionalLight_ShadowFlag;
SkColor ambientColor = SkColorSetARGB(ambientAlpha * 255, 0, 0, 0);
SkColor spotColor = SkColorSetARGB(spotAlpha * 255, 0, 0, 0);
SkShadowUtils::DrawShadow(canvas, path, zPlaneParams, lightPos, lightRadius,
ambientColor, spotColor, flags);
canvas->drawPath(path, paint);
}
void onDrawContent(SkCanvas* canvas) override {
canvas->drawColor(0xFFFFFFFF);
const SkScalar kLightRadius = 1.1f;
const SkScalar kAmbientAlpha = 0.05f;
const SkScalar kSpotAlpha = 0.35f;
const SkScalar elevations[] = { 1, 3, 6, 8, 12, 24 };
SkPaint paint;
paint.setAntiAlias(true);
SkPoint3 lightPos = fLightPos;
SkPoint3 zPlaneParams = SkPoint3::Make(0, 0, 0);
paint.setColor(SK_ColorWHITE);
canvas->save();
canvas->translate(80, 80);
for (unsigned int i = 0; i < SK_ARRAY_COUNT(elevations); ++i) {
zPlaneParams.fZ = elevations[i];
this->drawShadowedPath(canvas, fCirclePath, zPlaneParams, paint, kAmbientAlpha,
lightPos, kLightRadius, kSpotAlpha);
canvas->translate(80, 0);
}
canvas->restore();
canvas->save();
canvas->translate(120, 175);
for (unsigned int i = 0; i < SK_ARRAY_COUNT(elevations); ++i) {
zPlaneParams.fZ = elevations[i];
this->drawShadowedPath(canvas, fCapsulePath, zPlaneParams, paint, kAmbientAlpha,
lightPos, kLightRadius, kSpotAlpha);
canvas->translate(160, 0);
}
canvas->restore();
canvas->save();
canvas->translate(120, 320);
for (unsigned int i = 0; i < SK_ARRAY_COUNT(elevations); ++i) {
zPlaneParams.fZ = elevations[i];
this->drawShadowedPath(canvas, fLargeRRPath, zPlaneParams, paint, kAmbientAlpha,
lightPos, kLightRadius, kSpotAlpha);
canvas->translate(160, 0);
}
canvas->restore();
canvas->save();
canvas->translate(100, 475);
for (unsigned int i = 0; i < SK_ARRAY_COUNT(elevations); ++i) {
zPlaneParams.fZ = elevations[i];
this->drawShadowedPath(canvas, fSmallRRPath, zPlaneParams, paint, kAmbientAlpha,
lightPos, kLightRadius, kSpotAlpha);
canvas->translate(160, 0);
}
canvas->restore();
canvas->save();
canvas->translate(100, 600);
for (unsigned int i = 0; i < SK_ARRAY_COUNT(elevations); ++i) {
canvas->save();
zPlaneParams.fZ = elevations[i];
canvas->rotate(10);
this->drawShadowedPath(canvas, fSmallRRPath, zPlaneParams, paint, kAmbientAlpha,
lightPos, kLightRadius, kSpotAlpha);
canvas->restore();
canvas->translate(160, 0);
}
canvas->restore();
canvas->save();
canvas->translate(100, 725);
for (unsigned int i = 0; i < SK_ARRAY_COUNT(elevations); ++i) {
canvas->save();
zPlaneParams.fZ = elevations[i];
canvas->rotate(45);
this->drawShadowedPath(canvas, fSmallRRPath, zPlaneParams, paint, kAmbientAlpha,
lightPos, kLightRadius, kSpotAlpha);
canvas->restore();
canvas->translate(160, 0);
}
canvas->restore();
}
private:
using INHERITED = Sample;
};
//////////////////////////////////////////////////////////////////////////////
DEF_SAMPLE( return new MaterialShadowsView(); )