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Unified Diff: gm/lightingshaderbevel.cpp

Issue 2080993002: Added API for Bevel NormalSource. (Closed) Base URL: https://skia.googlesource.com/skia@dvonbeck-diffuse-api-change
Patch Set: fixed unused field Created 4 years, 5 months ago
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Index: gm/lightingshaderbevel.cpp
diff --git a/gm/lightingshaderbevel.cpp b/gm/lightingshaderbevel.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..d119a27cbd1cca7d440d92278483a0769c6a3a82
--- /dev/null
+++ b/gm/lightingshaderbevel.cpp
@@ -0,0 +1,269 @@
+/*
+ * Copyright 2016 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "gm.h"
+
+#include "SkBitmapProcShader.h"
+#include "SkLightingShader.h"
+#include "SkNormalSource.h"
+#include "SkPath.h"
+#include "SkPoint3.h"
+#include "SkShader.h"
+
+
+namespace skiagm {
+
+// This GM exercises lighting shaders when used with bevel SkNormalSource objects.
+class LightingShaderBevelGM : public GM {
+public:
+ LightingShaderBevelGM() {
+ this->setBGColor(sk_tool_utils::color_to_565(0xFFCCCCCC));
+ }
+
+protected:
+ SkString onShortName() override {
+ return SkString("lightingshaderbevel");
+ }
+
+ SkISize onISize() override {
+ return SkISize::Make(SkScalarCeilToInt(GRID_NUM_COLUMNS * GRID_CELL_WIDTH),
+ SkScalarCeilToInt(GRID_NUM_ROWS * GRID_CELL_WIDTH));
+ }
+
+ void onOnceBeforeDraw() override {
+ SkLights::Builder builder;
+ const SkVector3 kLightFromUpperRight = SkVector3::Make(0.788f, 0.394f, 0.473f);
+
+ builder.add(SkLights::Light(SkColor3f::Make(1.0f, 1.0f, 1.0f),
+ kLightFromUpperRight));
+ builder.add(SkLights::Light(SkColor3f::Make(0.2f, 0.2f, 0.2f)));
+ fLights = builder.finish();
+
+ // fRect is assumed to be square throughout this file
+ fRect = SkRect::MakeIWH(kTexSize, kTexSize);
+ SkMatrix matrix;
+ SkRect bitmapBounds = SkRect::MakeIWH(kTexSize, kTexSize);
+ matrix.setRectToRect(bitmapBounds, fRect, SkMatrix::kFill_ScaleToFit);
+
+ SkBitmap diffuseMap = sk_tool_utils::create_checkerboard_bitmap(
+ kTexSize, kTexSize,
+ sk_tool_utils::color_to_565(0x0),
+ sk_tool_utils::color_to_565(0xFF804020),
+ 8);
+ fDiffuse = SkMakeBitmapShader(diffuseMap, SkShader::kClamp_TileMode,
+ SkShader::kClamp_TileMode, &matrix, nullptr);
+
+ fConvexPath.moveTo(fRect.width() / 2.0f, 0.0f);
+ fConvexPath.lineTo(0.0f, fRect.height());
+ fConvexPath.lineTo(fRect.width(), fRect.height());
+ fConvexPath.close();
+
+ // Creating concave path
+ {
+ SkScalar x = 0.0f;
+ SkScalar y = fRect.height() / 2.0f;
+
+ const int NUM_SPIKES = 8;
+
+ const SkScalar x0 = x;
+ const SkScalar dx = fRect.width() / (NUM_SPIKES * 2);
+ const SkScalar dy = SK_Scalar1 * 10;
+
+
+ fConcavePath.moveTo(x, y + dy);
+ for (int i = 0; i < NUM_SPIKES; i++) {
+ x += dx;
+ fConcavePath.lineTo(x, y - dy);
+ x += dx;
+ fConcavePath.lineTo(x, y + dy);
+ }
+ fConcavePath.lineTo(x, y + (2 * dy));
+ fConcavePath.lineTo(x0, y + (2 * dy));
+ fConcavePath.close();
+ }
+ }
+
+ // Scales shape around origin, rotates shape around origin, then translates shape to origin
+ void positionCTM(SkCanvas *canvas, SkScalar scaleX, SkScalar scaleY, SkScalar rotate) const {
+ canvas->translate(kTexSize/2.0f, kTexSize/2.0f);
+ canvas->scale(scaleX, scaleY);
+ canvas->rotate(rotate);
+ canvas->translate(-kTexSize/2.0f, -kTexSize/2.0f);
+ }
+
+ enum Shape {
+ kCircle_Shape,
+ kRect_Shape,
+ kRRect_Shape,
+ kConvexPath_Shape,
+ kConcavePath_Shape,
+
+ kLast_Shape = kConcavePath_Shape
+ };
+ void drawShape(enum Shape shape, SkCanvas* canvas, SkScalar scaleX, SkScalar scaleY,
+ SkScalar rotate, SkNormalSource::BevelType bevelType, SkScalar bevelHeight) {
+ canvas->save();
+
+ this->positionCTM(canvas, scaleX, scaleY, rotate);
+
+ SkPaint paint;
+
+ SkScalar bevelWidth = 10.0f;
+ sk_sp<SkNormalSource> normalSource = SkNormalSource::MakeBevel(bevelType, bevelWidth,
+ bevelHeight);
+
+ paint.setShader(SkLightingShader::Make(fDiffuse, std::move(normalSource), fLights));
+ paint.setAntiAlias(true);
+ switch(shape) {
+ case kCircle_Shape:
+ canvas->drawCircle(fRect.centerX(), fRect.centerY(), fRect.width()/2.0f, paint);
+ break;
+ case kRect_Shape:
+ canvas->drawRect(fRect, paint);
+ break;
+ case kRRect_Shape:
+ canvas->drawRoundRect(fRect, 5.0f, 5.0f, paint);
+ break;
+ case kConvexPath_Shape:
+ canvas->drawPath(fConvexPath, paint);
+ break;
+ case kConcavePath_Shape:
+ canvas->drawPath(fConcavePath, paint);
+ break;
+ default:
+ SkDEBUGFAIL("Invalid shape enum for drawShape");
+ }
+
+ canvas->restore();
+ }
+
+ void onDraw(SkCanvas* canvas) override {
+ SkPaint labelPaint;
+ labelPaint.setTypeface(sk_tool_utils::create_portable_typeface("sans-serif",
+ SkFontStyle()));
+ labelPaint.setAntiAlias(true);
+ labelPaint.setTextSize(LABEL_SIZE);
+
+ int gridNum = 0;
+
+ // Running through all possible parameter combinations
+ for (auto bevelType : {SkNormalSource::BevelType::kLinear,
+ SkNormalSource::BevelType::kRoundedIn,
+ SkNormalSource::BevelType::kRoundedOut}) {
+ for (SkScalar bevelHeight: {-7.0f, 7.0f}) {
+ for (int shapeInt = 0; shapeInt < NUM_SHAPES; shapeInt++) {
+ Shape shape = (Shape)shapeInt;
+
+ // Determining position
+ SkScalar xPos = (gridNum / GRID_NUM_ROWS) * GRID_CELL_WIDTH;
+ SkScalar yPos = (gridNum % GRID_NUM_ROWS) * GRID_CELL_WIDTH;
+
+ canvas->save();
+
+ canvas->translate(xPos, yPos);
+ this->drawShape(shape, canvas, 1.0f, 1.0f, 0.f, bevelType, bevelHeight);
+ // Drawing labels
+ canvas->translate(0.0f, SkIntToScalar(kTexSize));
+ {
+ canvas->translate(0.0f, LABEL_SIZE);
+ SkString label;
+ label.append("bevelType: ");
+ switch (bevelType) {
+ case SkNormalSource::BevelType::kLinear:
+ label.append("linear");
+ break;
+ case SkNormalSource::BevelType::kRoundedIn:
+ label.append("roundedIn");
+ break;
+ case SkNormalSource::BevelType::kRoundedOut:
+ label.append("roundedOut");
+ break;
+ }
+ canvas->drawText(label.c_str(), label.size(), 0.0f, 0.0f, labelPaint);
+ }
+ {
+ canvas->translate(0.0f, LABEL_SIZE);
+ SkString label;
+ label.appendf("bevelHeight: %.1f", bevelHeight);
+ canvas->drawText(label.c_str(), label.size(), 0.0f, 0.0f, labelPaint);
+ }
+
+ canvas->restore();
+
+ gridNum++;
+ }
+ }
+ }
+
+ // Testing rotation
+ for (int shapeInt = 0; shapeInt < NUM_SHAPES; shapeInt++) {
+ Shape shape = (Shape)shapeInt;
+
+ // Determining position
+ SkScalar xPos = (gridNum / GRID_NUM_ROWS) * GRID_CELL_WIDTH;
+ SkScalar yPos = (gridNum % GRID_NUM_ROWS) * GRID_CELL_WIDTH;
+
+ canvas->save();
+
+ canvas->translate(xPos, yPos);
+ this->drawShape(shape, canvas, SK_ScalarRoot2Over2, SK_ScalarRoot2Over2, 45.0f,
+ SkNormalSource::BevelType::kLinear, 7.0f);
+
+ // Drawing labels
+ canvas->translate(0.0f, SkIntToScalar(kTexSize));
+ {
+ canvas->translate(0.0f, LABEL_SIZE);
+ SkString label;
+ label.appendf("bevelType: linear");
+ canvas->drawText(label.c_str(), label.size(), 0.0f, 0.0f, labelPaint);
+ }
+ {
+ canvas->translate(0.0f, LABEL_SIZE);
+ SkString label;
+ label.appendf("bevelHeight: %.1f", 7.0f);
+ canvas->drawText(label.c_str(), label.size(), 0.0f, 0.0f, labelPaint);
+ }
+ {
+ canvas->translate(0.0f, LABEL_SIZE);
+ SkString label;
+ label.appendf("rotated");
+ canvas->drawText(label.c_str(), label.size(), 0.0f, 0.0f, labelPaint);
+ }
+
+ canvas->restore();
+
+ gridNum++;
+ }
+
+ // Making sure NUM_COMBINATIONS_PER_SHAPE is set correctly
+ SkASSERT(gridNum == (NUM_COMBINATIONS_PER_SHAPE*NUM_SHAPES));
+ }
+
+private:
+ static constexpr int kTexSize = 96;
+ static constexpr int NUM_SHAPES = kLast_Shape + 1;
+ static constexpr int NUM_COMBINATIONS_PER_SHAPE = 7;
+ static constexpr int GRID_NUM_ROWS = NUM_SHAPES;
+ static constexpr int GRID_NUM_COLUMNS = NUM_COMBINATIONS_PER_SHAPE;
+ static constexpr SkScalar LABEL_SIZE = 10.0f;
+ static constexpr int NUM_LABELS_PER_CELL = 3;
+ static constexpr SkScalar GRID_CELL_WIDTH = kTexSize + 10.0f + NUM_LABELS_PER_CELL * LABEL_SIZE;
+
+ sk_sp<SkShader> fDiffuse;
+
+ SkRect fRect;
+ SkPath fConvexPath;
+ SkPath fConcavePath;
+ sk_sp<SkLights> fLights;
+
+ typedef GM INHERITED;
+};
+
+//////////////////////////////////////////////////////////////////////////////
+
+DEF_GM(return new LightingShaderBevelGM;)
+}
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