Add material shadows sample.
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>
diff --git a/samplecode/SampleMaterialShadows.cpp b/samplecode/SampleMaterialShadows.cpp
new file mode 100644
index 0000000..e84c5cf
--- /dev/null
+++ b/samplecode/SampleMaterialShadows.cpp
@@ -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(); )