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- /*
- * 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/gm.h"
- #include "include/core/SkBitmap.h"
- #include "include/core/SkCanvas.h"
- #include "include/core/SkColor.h"
- #include "include/core/SkFont.h"
- #include "include/core/SkFontStyle.h"
- #include "include/core/SkMatrix.h"
- #include "include/core/SkPaint.h"
- #include "include/core/SkPoint3.h"
- #include "include/core/SkRect.h"
- #include "include/core/SkRefCnt.h"
- #include "include/core/SkScalar.h"
- #include "include/core/SkShader.h"
- #include "include/core/SkSize.h"
- #include "include/core/SkString.h"
- #include "include/core/SkTypeface.h"
- #include "src/core/SkNormalSource.h"
- #include "src/shaders/SkLightingShader.h"
- #include "src/shaders/SkLights.h"
- #include "tools/ToolUtils.h"
- #include <initializer_list>
- #include <utility>
- // Create a truncated pyramid normal map
- static SkBitmap make_frustum_normalmap(int texSize) {
- SkBitmap frustum;
- frustum.allocN32Pixels(texSize, texSize);
- ToolUtils::create_frustum_normal_map(&frustum, SkIRect::MakeWH(texSize, texSize));
- return frustum;
- }
- namespace skiagm {
- // This GM exercises lighting shaders. Specifically, nullptr arguments, scaling when using
- // normal maps, paint transparency, zero directional lights, multiple directional lights.
- class LightingShader2GM : public GM {
- public:
- LightingShader2GM() : fRect(SkRect::MakeIWH(kTexSize, kTexSize)) {
- this->setBGColor(ToolUtils::color_to_565(0xFF0000CC));
- }
- protected:
- SkString onShortName() override {
- return SkString("lightingshader2");
- }
- SkISize onISize() override {
- return SkISize::Make(600, 740);
- }
- void onOnceBeforeDraw() override {
- // The light direction is towards the light with +Z coming out of the screen
- const SkVector3 kLightFromUpperRight = SkVector3::Make(0.788f, 0.394f, 0.473f);
- const SkVector3 kLightFromUpperLeft = SkVector3::Make(-0.788f, 0.394f, 0.473f);
- // Standard set of lights
- {
- SkLights::Builder builder;
- 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();
- }
- // No directional lights
- {
- SkLights::Builder builder;
- builder.setAmbientLightColor(SkColor3f::Make(0.2f, 0.2f, 0.2f));
- fLightsNoDir = builder.finish();
- }
- // Two directional lights
- {
- SkLights::Builder builder;
- builder.add(SkLights::Light::MakeDirectional(SkColor3f::Make(1.0f, 0.0f, 0.0f),
- kLightFromUpperRight));
- builder.add(SkLights::Light::MakeDirectional(SkColor3f::Make(0.0f, 1.0f, 0.0f),
- kLightFromUpperLeft));
- builder.setAmbientLightColor(SkColor3f::Make(0.2f, 0.2f, 0.2f));
- fLightsTwoDir = builder.finish();
- }
- SkMatrix matrix;
- SkRect bitmapBounds = SkRect::MakeIWH(kTexSize, kTexSize);
- matrix.setRectToRect(bitmapBounds, fRect, SkMatrix::kFill_ScaleToFit);
- SkBitmap opaqueDiffuseMap = ToolUtils::create_checkerboard_bitmap(
- kTexSize, kTexSize, SK_ColorBLACK, 0xFF808080, 8);
- fOpaqueDiffuse = opaqueDiffuseMap.makeShader(&matrix);
- SkBitmap translucentDiffuseMap =
- ToolUtils::create_checkerboard_bitmap(kTexSize,
- kTexSize,
- SkColorSetARGB(0x55, 0x00, 0x00, 0x00),
- SkColorSetARGB(0x55, 0x80, 0x80, 0x80),
- 8);
- fTranslucentDiffuse = translucentDiffuseMap.makeShader(&matrix);
- SkBitmap normalMap = make_frustum_normalmap(kTexSize);
- fNormalMapShader = normalMap.makeShader(&matrix);
- }
- // 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);
- }
- void drawRect(SkCanvas* canvas, SkScalar scaleX, SkScalar scaleY,
- SkScalar rotate, bool useNormalSource, bool useDiffuseShader,
- bool useTranslucentPaint, bool useTranslucentShader, sk_sp<SkLights> lights) {
- canvas->save();
- this->positionCTM(canvas, scaleX, scaleY, rotate);
- const SkMatrix& ctm = canvas->getTotalMatrix();
- SkPaint paint;
- sk_sp<SkNormalSource> normalSource = nullptr;
- sk_sp<SkShader> diffuseShader = nullptr;
- if (useNormalSource) {
- normalSource = SkNormalSource::MakeFromNormalMap(fNormalMapShader, ctm);
- }
- if (useDiffuseShader) {
- diffuseShader = (useTranslucentShader) ? fTranslucentDiffuse : fOpaqueDiffuse;
- } else {
- paint.setColor(SK_ColorGREEN);
- }
- if (useTranslucentPaint) {
- paint.setAlpha(0x99);
- }
- paint.setShader(SkLightingShader::Make(std::move(diffuseShader), std::move(normalSource),
- std::move(lights)));
- canvas->drawRect(fRect, paint);
- canvas->restore();
- }
- void onDraw(SkCanvas* canvas) override {
- SkPaint labelPaint;
- SkFont font(ToolUtils::create_portable_typeface("sans-serif", SkFontStyle()), kLabelSize);
- int gridNum = 0;
- // Running through all possible bool parameter combinations
- for (bool useNormalSource : {true, false}) {
- for (bool useDiffuseShader : {true, false}) {
- for (bool useTranslucentPaint : {true, false}) {
- for (bool useTranslucentShader : {true, false}) {
- // Determining position
- SkScalar xPos = (gridNum % kGridColumnNum) * kGridCellWidth;
- SkScalar yPos = (gridNum / kGridColumnNum) * kGridCellWidth;
- canvas->save();
- canvas->translate(xPos, yPos);
- this->drawRect(canvas, 1.0f, 1.0f, 0.f, useNormalSource, useDiffuseShader,
- useTranslucentPaint, useTranslucentShader, fLights);
- // Drawing labels
- canvas->translate(0.0f, SkIntToScalar(kTexSize));
- {
- canvas->translate(0.0f, kLabelSize);
- SkString label;
- label.appendf("useNormalSource: %d", useNormalSource);
- canvas->drawString(label, 0.0f, 0.0f, font, labelPaint);
- }
- {
- canvas->translate(0.0f, kLabelSize);
- SkString label;
- label.appendf("useDiffuseShader: %d", useDiffuseShader);
- canvas->drawString(label, 0.0f, 0.0f, font, labelPaint);
- }
- {
- canvas->translate(0.0f, kLabelSize);
- SkString label;
- label.appendf("useTranslucentPaint: %d", useTranslucentPaint);
- canvas->drawString(label, 0.0f, 0.0f, font, labelPaint);
- }
- {
- canvas->translate(0.0f, kLabelSize);
- SkString label;
- label.appendf("useTranslucentShader: %d", useTranslucentShader);
- canvas->drawString(label, 0.0f, 0.0f, font, labelPaint);
- }
- canvas->restore();
- gridNum++;
- }
- }
- }
- }
- // Rotation/scale test
- {
- SkScalar xPos = (gridNum % kGridColumnNum) * kGridCellWidth;
- SkScalar yPos = (gridNum / kGridColumnNum) * kGridCellWidth;
- canvas->save();
- canvas->translate(xPos, yPos);
- this->drawRect(canvas, 0.6f, 0.6f, 45.0f, true, true, true, true, fLights);
- canvas->restore();
- gridNum++;
- }
- // Anisotropic scale test
- {
- SkScalar xPos = (gridNum % kGridColumnNum) * kGridCellWidth;
- SkScalar yPos = (gridNum / kGridColumnNum) * kGridCellWidth;
- canvas->save();
- canvas->translate(xPos, yPos);
- this->drawRect(canvas, 0.6f, 0.4f, 30.0f, true, true, true, true, fLights);
- canvas->restore();
- gridNum++;
- }
- // No directional lights test
- {
- SkScalar xPos = (gridNum % kGridColumnNum) * kGridCellWidth;
- SkScalar yPos = (gridNum / kGridColumnNum) * kGridCellWidth;
- canvas->save();
- canvas->translate(xPos, yPos);
- this->drawRect(canvas, 1.0f, 1.0f, 0.0f, true, true, false, false, fLightsNoDir);
- canvas->restore();
- gridNum++;
- }
- // Two directional lights test
- {
- SkScalar xPos = (gridNum % kGridColumnNum) * kGridCellWidth;
- SkScalar yPos = (gridNum / kGridColumnNum) * kGridCellWidth;
- canvas->save();
- canvas->translate(xPos, yPos);
- this->drawRect(canvas, 1.0f, 1.0f, 0.0f, true, true, false, false, fLightsTwoDir);
- canvas->restore();
- gridNum++;
- }
- }
- private:
- static constexpr int kTexSize = 96;
- static constexpr int kNumBooleanParams = 4;
- static constexpr SkScalar kLabelSize = 10.0f;
- static constexpr int kGridColumnNum = 4;
- static constexpr SkScalar kGridCellWidth = kTexSize + 20.0f + kNumBooleanParams * kLabelSize;
- sk_sp<SkShader> fOpaqueDiffuse;
- sk_sp<SkShader> fTranslucentDiffuse;
- sk_sp<SkShader> fNormalMapShader;
- const SkRect fRect;
- sk_sp<SkLights> fLights;
- sk_sp<SkLights> fLightsNoDir;
- sk_sp<SkLights> fLightsTwoDir;
- typedef GM INHERITED;
- };
- //////////////////////////////////////////////////////////////////////////////
- DEF_GM(return new LightingShader2GM;)
- }
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