/*
* 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 "sk_tool_utils.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::MakeDirectional(SkColor3f::Make(1.0f, 1.0f, 1.0f),
kLightFromUpperRight));
builder.setAmbientLightColor(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 = SkShader::MakeBitmapShader(diffuseMap, SkShader::kClamp_TileMode,
SkShader::kClamp_TileMode, &matrix);
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;)
}