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- /*
- * Copyright 2013 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
- #include "include/effects/SkPerlinNoiseShader.h"
- #include "include/core/SkColorFilter.h"
- #include "include/core/SkShader.h"
- #include "include/core/SkString.h"
- #include "include/core/SkUnPreMultiply.h"
- #include "src/core/SkArenaAlloc.h"
- #include "src/core/SkMakeUnique.h"
- #include "src/core/SkReadBuffer.h"
- #include "src/core/SkWriteBuffer.h"
- #if SK_SUPPORT_GPU
- #include "include/private/GrRecordingContext.h"
- #include "src/gpu/GrCoordTransform.h"
- #include "src/gpu/GrRecordingContextPriv.h"
- #include "src/gpu/SkGr.h"
- #include "src/gpu/effects/generated/GrConstColorProcessor.h"
- #include "src/gpu/glsl/GrGLSLFragmentProcessor.h"
- #include "src/gpu/glsl/GrGLSLFragmentShaderBuilder.h"
- #include "src/gpu/glsl/GrGLSLProgramDataManager.h"
- #include "src/gpu/glsl/GrGLSLUniformHandler.h"
- #endif
- static const int kBlockSize = 256;
- static const int kBlockMask = kBlockSize - 1;
- static const int kPerlinNoise = 4096;
- static const int kRandMaximum = SK_MaxS32; // 2**31 - 1
- static uint8_t improved_noise_permutations[] = {
- 151, 160, 137, 91, 90, 15, 131, 13, 201, 95, 96, 53, 194, 233, 7, 225, 140, 36, 103,
- 30, 69, 142, 8, 99, 37, 240, 21, 10, 23, 190, 6, 148, 247, 120, 234, 75, 0, 26,
- 197, 62, 94, 252, 219, 203, 117, 35, 11, 32, 57, 177, 33, 88, 237, 149, 56, 87, 174,
- 20, 125, 136, 171, 168, 68, 175, 74, 165, 71, 134, 139, 48, 27, 166, 77, 146, 158, 231,
- 83, 111, 229, 122, 60, 211, 133, 230, 220, 105, 92, 41, 55, 46, 245, 40, 244, 102, 143,
- 54, 65, 25, 63, 161, 1, 216, 80, 73, 209, 76, 132, 187, 208, 89, 18, 169, 200, 196,
- 135, 130, 116, 188, 159, 86, 164, 100, 109, 198, 173, 186, 3, 64, 52, 217, 226, 250, 124,
- 123, 5, 202, 38, 147, 118, 126, 255, 82, 85, 212, 207, 206, 59, 227, 47, 16, 58, 17,
- 182, 189, 28, 42, 223, 183, 170, 213, 119, 248, 152, 2, 44, 154, 163, 70, 221, 153, 101,
- 155, 167, 43, 172, 9, 129, 22, 39, 253, 19, 98, 108, 110, 79, 113, 224, 232, 178, 185,
- 112, 104, 218, 246, 97, 228, 251, 34, 242, 193, 238, 210, 144, 12, 191, 179, 162, 241, 81,
- 51, 145, 235, 249, 14, 239, 107, 49, 192, 214, 31, 181, 199, 106, 157, 184, 84, 204, 176,
- 115, 121, 50, 45, 127, 4, 150, 254, 138, 236, 205, 93, 222, 114, 67, 29, 24, 72, 243,
- 141, 128, 195, 78, 66, 215, 61, 156, 180,
- 151, 160, 137, 91, 90, 15, 131, 13, 201, 95, 96, 53, 194, 233, 7, 225, 140, 36, 103,
- 30, 69, 142, 8, 99, 37, 240, 21, 10, 23, 190, 6, 148, 247, 120, 234, 75, 0, 26,
- 197, 62, 94, 252, 219, 203, 117, 35, 11, 32, 57, 177, 33, 88, 237, 149, 56, 87, 174,
- 20, 125, 136, 171, 168, 68, 175, 74, 165, 71, 134, 139, 48, 27, 166, 77, 146, 158, 231,
- 83, 111, 229, 122, 60, 211, 133, 230, 220, 105, 92, 41, 55, 46, 245, 40, 244, 102, 143,
- 54, 65, 25, 63, 161, 1, 216, 80, 73, 209, 76, 132, 187, 208, 89, 18, 169, 200, 196,
- 135, 130, 116, 188, 159, 86, 164, 100, 109, 198, 173, 186, 3, 64, 52, 217, 226, 250, 124,
- 123, 5, 202, 38, 147, 118, 126, 255, 82, 85, 212, 207, 206, 59, 227, 47, 16, 58, 17,
- 182, 189, 28, 42, 223, 183, 170, 213, 119, 248, 152, 2, 44, 154, 163, 70, 221, 153, 101,
- 155, 167, 43, 172, 9, 129, 22, 39, 253, 19, 98, 108, 110, 79, 113, 224, 232, 178, 185,
- 112, 104, 218, 246, 97, 228, 251, 34, 242, 193, 238, 210, 144, 12, 191, 179, 162, 241, 81,
- 51, 145, 235, 249, 14, 239, 107, 49, 192, 214, 31, 181, 199, 106, 157, 184, 84, 204, 176,
- 115, 121, 50, 45, 127, 4, 150, 254, 138, 236, 205, 93, 222, 114, 67, 29, 24, 72, 243,
- 141, 128, 195, 78, 66, 215, 61, 156, 180
- };
- class SkPerlinNoiseShaderImpl : public SkShaderBase {
- public:
- struct StitchData {
- StitchData()
- : fWidth(0)
- , fWrapX(0)
- , fHeight(0)
- , fWrapY(0)
- {}
- StitchData(SkScalar w, SkScalar h)
- : fWidth(SkTMin(SkScalarRoundToInt(w), SK_MaxS32 - kPerlinNoise))
- , fWrapX(kPerlinNoise + fWidth)
- , fHeight(SkTMin(SkScalarRoundToInt(h), SK_MaxS32 - kPerlinNoise))
- , fWrapY(kPerlinNoise + fHeight) {}
- bool operator==(const StitchData& other) const {
- return fWidth == other.fWidth &&
- fWrapX == other.fWrapX &&
- fHeight == other.fHeight &&
- fWrapY == other.fWrapY;
- }
- int fWidth; // How much to subtract to wrap for stitching.
- int fWrapX; // Minimum value to wrap.
- int fHeight;
- int fWrapY;
- };
- struct PaintingData {
- PaintingData(const SkISize& tileSize, SkScalar seed,
- SkScalar baseFrequencyX, SkScalar baseFrequencyY,
- const SkMatrix& matrix)
- {
- SkVector tileVec;
- matrix.mapVector(SkIntToScalar(tileSize.fWidth), SkIntToScalar(tileSize.fHeight),
- &tileVec);
- SkSize scale;
- if (!matrix.decomposeScale(&scale, nullptr)) {
- scale.set(SK_ScalarNearlyZero, SK_ScalarNearlyZero);
- }
- fBaseFrequency.set(baseFrequencyX * SkScalarInvert(scale.width()),
- baseFrequencyY * SkScalarInvert(scale.height()));
- fTileSize.set(SkScalarRoundToInt(tileVec.fX), SkScalarRoundToInt(tileVec.fY));
- this->init(seed);
- if (!fTileSize.isEmpty()) {
- this->stitch();
- }
- #if SK_SUPPORT_GPU
- SkImageInfo info = SkImageInfo::MakeA8(kBlockSize, 1);
- SkPixmap permutationsPixmap(info, fLatticeSelector, info.minRowBytes());
- fPermutationsImage = SkImage::MakeFromRaster(permutationsPixmap, nullptr, nullptr);
- info = SkImageInfo::MakeN32Premul(kBlockSize, 4);
- SkPixmap noisePixmap(info, fNoise[0][0], info.minRowBytes());
- fNoiseImage = SkImage::MakeFromRaster(noisePixmap, nullptr, nullptr);
- info = SkImageInfo::MakeA8(256, 1);
- SkPixmap impPermutationsPixmap(info, improved_noise_permutations, info.minRowBytes());
- fImprovedPermutationsImage = SkImage::MakeFromRaster(impPermutationsPixmap, nullptr,
- nullptr);
- static uint8_t gradients[] = { 2, 2, 1, 0,
- 0, 2, 1, 0,
- 2, 0, 1, 0,
- 0, 0, 1, 0,
- 2, 1, 2, 0,
- 0, 1, 2, 0,
- 2, 1, 0, 0,
- 0, 1, 0, 0,
- 1, 2, 2, 0,
- 1, 0, 2, 0,
- 1, 2, 0, 0,
- 1, 0, 0, 0,
- 2, 2, 1, 0,
- 1, 0, 2, 0,
- 0, 2, 1, 0,
- 1, 0, 0, 0 };
- info = SkImageInfo::MakeN32Premul(16, 1);
- SkPixmap gradPixmap(info, gradients, info.minRowBytes());
- fGradientImage = SkImage::MakeFromRaster(gradPixmap, nullptr, nullptr);
- #endif
- }
- #if SK_SUPPORT_GPU
- PaintingData(const PaintingData& that)
- : fSeed(that.fSeed)
- , fTileSize(that.fTileSize)
- , fBaseFrequency(that.fBaseFrequency)
- , fStitchDataInit(that.fStitchDataInit)
- , fPermutationsImage(that.fPermutationsImage)
- , fNoiseImage(that.fNoiseImage)
- , fImprovedPermutationsImage(that.fImprovedPermutationsImage)
- , fGradientImage(that.fGradientImage) {
- memcpy(fLatticeSelector, that.fLatticeSelector, sizeof(fLatticeSelector));
- memcpy(fNoise, that.fNoise, sizeof(fNoise));
- memcpy(fGradient, that.fGradient, sizeof(fGradient));
- }
- #endif
- int fSeed;
- uint8_t fLatticeSelector[kBlockSize];
- uint16_t fNoise[4][kBlockSize][2];
- SkPoint fGradient[4][kBlockSize];
- SkISize fTileSize;
- SkVector fBaseFrequency;
- StitchData fStitchDataInit;
- private:
- #if SK_SUPPORT_GPU
- sk_sp<SkImage> fPermutationsImage;
- sk_sp<SkImage> fNoiseImage;
- sk_sp<SkImage> fImprovedPermutationsImage;
- sk_sp<SkImage> fGradientImage;
- #endif
- inline int random() {
- static const int gRandAmplitude = 16807; // 7**5; primitive root of m
- static const int gRandQ = 127773; // m / a
- static const int gRandR = 2836; // m % a
- int result = gRandAmplitude * (fSeed % gRandQ) - gRandR * (fSeed / gRandQ);
- if (result <= 0)
- result += kRandMaximum;
- fSeed = result;
- return result;
- }
- // Only called once. Could be part of the constructor.
- void init(SkScalar seed)
- {
- static const SkScalar gInvBlockSizef = SkScalarInvert(SkIntToScalar(kBlockSize));
- // According to the SVG spec, we must truncate (not round) the seed value.
- fSeed = SkScalarTruncToInt(seed);
- // The seed value clamp to the range [1, kRandMaximum - 1].
- if (fSeed <= 0) {
- fSeed = -(fSeed % (kRandMaximum - 1)) + 1;
- }
- if (fSeed > kRandMaximum - 1) {
- fSeed = kRandMaximum - 1;
- }
- for (int channel = 0; channel < 4; ++channel) {
- for (int i = 0; i < kBlockSize; ++i) {
- fLatticeSelector[i] = i;
- fNoise[channel][i][0] = (random() % (2 * kBlockSize));
- fNoise[channel][i][1] = (random() % (2 * kBlockSize));
- }
- }
- for (int i = kBlockSize - 1; i > 0; --i) {
- int k = fLatticeSelector[i];
- int j = random() % kBlockSize;
- SkASSERT(j >= 0);
- SkASSERT(j < kBlockSize);
- fLatticeSelector[i] = fLatticeSelector[j];
- fLatticeSelector[j] = k;
- }
- // Perform the permutations now
- {
- // Copy noise data
- uint16_t noise[4][kBlockSize][2];
- for (int i = 0; i < kBlockSize; ++i) {
- for (int channel = 0; channel < 4; ++channel) {
- for (int j = 0; j < 2; ++j) {
- noise[channel][i][j] = fNoise[channel][i][j];
- }
- }
- }
- // Do permutations on noise data
- for (int i = 0; i < kBlockSize; ++i) {
- for (int channel = 0; channel < 4; ++channel) {
- for (int j = 0; j < 2; ++j) {
- fNoise[channel][i][j] = noise[channel][fLatticeSelector[i]][j];
- }
- }
- }
- }
- // Half of the largest possible value for 16 bit unsigned int
- static const SkScalar gHalfMax16bits = 32767.5f;
- // Compute gradients from permutated noise data
- for (int channel = 0; channel < 4; ++channel) {
- for (int i = 0; i < kBlockSize; ++i) {
- fGradient[channel][i] = SkPoint::Make(
- (fNoise[channel][i][0] - kBlockSize) * gInvBlockSizef,
- (fNoise[channel][i][1] - kBlockSize) * gInvBlockSizef);
- fGradient[channel][i].normalize();
- // Put the normalized gradient back into the noise data
- fNoise[channel][i][0] = SkScalarRoundToInt(
- (fGradient[channel][i].fX + 1) * gHalfMax16bits);
- fNoise[channel][i][1] = SkScalarRoundToInt(
- (fGradient[channel][i].fY + 1) * gHalfMax16bits);
- }
- }
- }
- // Only called once. Could be part of the constructor.
- void stitch() {
- SkScalar tileWidth = SkIntToScalar(fTileSize.width());
- SkScalar tileHeight = SkIntToScalar(fTileSize.height());
- SkASSERT(tileWidth > 0 && tileHeight > 0);
- // When stitching tiled turbulence, the frequencies must be adjusted
- // so that the tile borders will be continuous.
- if (fBaseFrequency.fX) {
- SkScalar lowFrequencx =
- SkScalarFloorToScalar(tileWidth * fBaseFrequency.fX) / tileWidth;
- SkScalar highFrequencx =
- SkScalarCeilToScalar(tileWidth * fBaseFrequency.fX) / tileWidth;
- // BaseFrequency should be non-negative according to the standard.
- // lowFrequencx can be 0 if fBaseFrequency.fX is very small.
- if (sk_ieee_float_divide(fBaseFrequency.fX, lowFrequencx) < highFrequencx / fBaseFrequency.fX) {
- fBaseFrequency.fX = lowFrequencx;
- } else {
- fBaseFrequency.fX = highFrequencx;
- }
- }
- if (fBaseFrequency.fY) {
- SkScalar lowFrequency =
- SkScalarFloorToScalar(tileHeight * fBaseFrequency.fY) / tileHeight;
- SkScalar highFrequency =
- SkScalarCeilToScalar(tileHeight * fBaseFrequency.fY) / tileHeight;
- // lowFrequency can be 0 if fBaseFrequency.fY is very small.
- if (sk_ieee_float_divide(fBaseFrequency.fY, lowFrequency) < highFrequency / fBaseFrequency.fY) {
- fBaseFrequency.fY = lowFrequency;
- } else {
- fBaseFrequency.fY = highFrequency;
- }
- }
- // Set up TurbulenceInitial stitch values.
- fStitchDataInit = StitchData(tileWidth * fBaseFrequency.fX,
- tileHeight * fBaseFrequency.fY);
- }
- public:
- #if SK_SUPPORT_GPU
- const sk_sp<SkImage> getPermutationsImage() const { return fPermutationsImage; }
- const sk_sp<SkImage> getNoiseImage() const { return fNoiseImage; }
- const sk_sp<SkImage> getImprovedPermutationsImage() const {
- return fImprovedPermutationsImage;
- }
- const sk_sp<SkImage> getGradientImage() const { return fGradientImage; }
- #endif
- };
- /**
- * About the noise types : the difference between the first 2 is just minor tweaks to the
- * algorithm, they're not 2 entirely different noises. The output looks different, but once the
- * noise is generated in the [1, -1] range, the output is brought back in the [0, 1] range by
- * doing :
- * kFractalNoise_Type : noise * 0.5 + 0.5
- * kTurbulence_Type : abs(noise)
- * Very little differences between the 2 types, although you can tell the difference visually.
- * "Improved" is based on the Improved Perlin Noise algorithm described at
- * http://mrl.nyu.edu/~perlin/noise/. It is quite distinct from the other two, and the noise is
- * a 2D slice of a 3D noise texture. Minor changes to the Z coordinate will result in minor
- * changes to the noise, making it suitable for animated noise.
- */
- enum Type {
- kFractalNoise_Type,
- kTurbulence_Type,
- kImprovedNoise_Type,
- kLast_Type = kImprovedNoise_Type
- };
- static const int kMaxOctaves = 255; // numOctaves must be <= 0 and <= kMaxOctaves
- SkPerlinNoiseShaderImpl(SkPerlinNoiseShaderImpl::Type type, SkScalar baseFrequencyX,
- SkScalar baseFrequencyY, int numOctaves, SkScalar seed,
- const SkISize* tileSize);
- class PerlinNoiseShaderContext : public Context {
- public:
- PerlinNoiseShaderContext(const SkPerlinNoiseShaderImpl& shader, const ContextRec&);
- void shadeSpan(int x, int y, SkPMColor[], int count) override;
- private:
- SkPMColor shade(const SkPoint& point, StitchData& stitchData) const;
- SkScalar calculateTurbulenceValueForPoint(
- int channel,
- StitchData& stitchData, const SkPoint& point) const;
- SkScalar calculateImprovedNoiseValueForPoint(int channel, const SkPoint& point) const;
- SkScalar noise2D(int channel,
- const StitchData& stitchData, const SkPoint& noiseVector) const;
- SkMatrix fMatrix;
- PaintingData fPaintingData;
- typedef Context INHERITED;
- };
- #if SK_SUPPORT_GPU
- std::unique_ptr<GrFragmentProcessor> asFragmentProcessor(const GrFPArgs&) const override;
- #endif
- protected:
- void flatten(SkWriteBuffer&) const override;
- #ifdef SK_ENABLE_LEGACY_SHADERCONTEXT
- Context* onMakeContext(const ContextRec&, SkArenaAlloc*) const override;
- #endif
- private:
- SK_FLATTENABLE_HOOKS(SkPerlinNoiseShaderImpl)
- const SkPerlinNoiseShaderImpl::Type fType;
- const SkScalar fBaseFrequencyX;
- const SkScalar fBaseFrequencyY;
- const int fNumOctaves;
- const SkScalar fSeed;
- const SkISize fTileSize;
- const bool fStitchTiles;
- friend class ::SkPerlinNoiseShader;
- typedef SkShaderBase INHERITED;
- };
- namespace {
- // noiseValue is the color component's value (or color)
- // limitValue is the maximum perlin noise array index value allowed
- // newValue is the current noise dimension (either width or height)
- inline int checkNoise(int noiseValue, int limitValue, int newValue) {
- // If the noise value would bring us out of bounds of the current noise array while we are
- // stiching noise tiles together, wrap the noise around the current dimension of the noise to
- // stay within the array bounds in a continuous fashion (so that tiling lines are not visible)
- if (noiseValue >= limitValue) {
- noiseValue -= newValue;
- }
- return noiseValue;
- }
- inline SkScalar smoothCurve(SkScalar t) {
- return t * t * (3 - 2 * t);
- }
- } // end namespace
- SkPerlinNoiseShaderImpl::SkPerlinNoiseShaderImpl(SkPerlinNoiseShaderImpl::Type type,
- SkScalar baseFrequencyX,
- SkScalar baseFrequencyY,
- int numOctaves,
- SkScalar seed,
- const SkISize* tileSize)
- : fType(type)
- , fBaseFrequencyX(baseFrequencyX)
- , fBaseFrequencyY(baseFrequencyY)
- , fNumOctaves(numOctaves > kMaxOctaves ? kMaxOctaves : numOctaves/*[0,255] octaves allowed*/)
- , fSeed(seed)
- , fTileSize(nullptr == tileSize ? SkISize::Make(0, 0) : *tileSize)
- , fStitchTiles(!fTileSize.isEmpty())
- {
- SkASSERT(numOctaves >= 0 && numOctaves <= kMaxOctaves);
- SkASSERT(fBaseFrequencyX >= 0);
- SkASSERT(fBaseFrequencyY >= 0);
- }
- sk_sp<SkFlattenable> SkPerlinNoiseShaderImpl::CreateProc(SkReadBuffer& buffer) {
- Type type = buffer.read32LE(kLast_Type);
- SkScalar freqX = buffer.readScalar();
- SkScalar freqY = buffer.readScalar();
- int octaves = buffer.read32LE<int>(kMaxOctaves);
- SkScalar seed = buffer.readScalar();
- SkISize tileSize;
- tileSize.fWidth = buffer.readInt();
- tileSize.fHeight = buffer.readInt();
- switch (type) {
- case kFractalNoise_Type:
- return SkPerlinNoiseShader::MakeFractalNoise(freqX, freqY, octaves, seed, &tileSize);
- case kTurbulence_Type:
- return SkPerlinNoiseShader::MakeTurbulence(freqX, freqY, octaves, seed, &tileSize);
- case kImprovedNoise_Type:
- return SkPerlinNoiseShader::MakeImprovedNoise(freqX, freqY, octaves, seed);
- default:
- // Really shouldn't get here b.c. of earlier check on type
- buffer.validate(false);
- return nullptr;
- }
- }
- void SkPerlinNoiseShaderImpl::flatten(SkWriteBuffer& buffer) const {
- buffer.writeInt((int) fType);
- buffer.writeScalar(fBaseFrequencyX);
- buffer.writeScalar(fBaseFrequencyY);
- buffer.writeInt(fNumOctaves);
- buffer.writeScalar(fSeed);
- buffer.writeInt(fTileSize.fWidth);
- buffer.writeInt(fTileSize.fHeight);
- }
- SkScalar SkPerlinNoiseShaderImpl::PerlinNoiseShaderContext::noise2D(
- int channel, const StitchData& stitchData, const SkPoint& noiseVector) const {
- struct Noise {
- int noisePositionIntegerValue;
- int nextNoisePositionIntegerValue;
- SkScalar noisePositionFractionValue;
- Noise(SkScalar component)
- {
- SkScalar position = component + kPerlinNoise;
- noisePositionIntegerValue = SkScalarFloorToInt(position);
- noisePositionFractionValue = position - SkIntToScalar(noisePositionIntegerValue);
- nextNoisePositionIntegerValue = noisePositionIntegerValue + 1;
- }
- };
- Noise noiseX(noiseVector.x());
- Noise noiseY(noiseVector.y());
- SkScalar u, v;
- const SkPerlinNoiseShaderImpl& perlinNoiseShader = static_cast<const SkPerlinNoiseShaderImpl&>(fShader);
- // If stitching, adjust lattice points accordingly.
- if (perlinNoiseShader.fStitchTiles) {
- noiseX.noisePositionIntegerValue =
- checkNoise(noiseX.noisePositionIntegerValue, stitchData.fWrapX, stitchData.fWidth);
- noiseY.noisePositionIntegerValue =
- checkNoise(noiseY.noisePositionIntegerValue, stitchData.fWrapY, stitchData.fHeight);
- noiseX.nextNoisePositionIntegerValue =
- checkNoise(noiseX.nextNoisePositionIntegerValue, stitchData.fWrapX, stitchData.fWidth);
- noiseY.nextNoisePositionIntegerValue =
- checkNoise(noiseY.nextNoisePositionIntegerValue, stitchData.fWrapY, stitchData.fHeight);
- }
- noiseX.noisePositionIntegerValue &= kBlockMask;
- noiseY.noisePositionIntegerValue &= kBlockMask;
- noiseX.nextNoisePositionIntegerValue &= kBlockMask;
- noiseY.nextNoisePositionIntegerValue &= kBlockMask;
- int i = fPaintingData.fLatticeSelector[noiseX.noisePositionIntegerValue];
- int j = fPaintingData.fLatticeSelector[noiseX.nextNoisePositionIntegerValue];
- int b00 = (i + noiseY.noisePositionIntegerValue) & kBlockMask;
- int b10 = (j + noiseY.noisePositionIntegerValue) & kBlockMask;
- int b01 = (i + noiseY.nextNoisePositionIntegerValue) & kBlockMask;
- int b11 = (j + noiseY.nextNoisePositionIntegerValue) & kBlockMask;
- SkScalar sx = smoothCurve(noiseX.noisePositionFractionValue);
- SkScalar sy = smoothCurve(noiseY.noisePositionFractionValue);
- if (sx < 0 || sy < 0 || sx > 1 || sy > 1) {
- return 0; // Check for pathological inputs.
- }
- // This is taken 1:1 from SVG spec: http://www.w3.org/TR/SVG11/filters.html#feTurbulenceElement
- SkPoint fractionValue = SkPoint::Make(noiseX.noisePositionFractionValue,
- noiseY.noisePositionFractionValue); // Offset (0,0)
- u = fPaintingData.fGradient[channel][b00].dot(fractionValue);
- fractionValue.fX -= SK_Scalar1; // Offset (-1,0)
- v = fPaintingData.fGradient[channel][b10].dot(fractionValue);
- SkScalar a = SkScalarInterp(u, v, sx);
- fractionValue.fY -= SK_Scalar1; // Offset (-1,-1)
- v = fPaintingData.fGradient[channel][b11].dot(fractionValue);
- fractionValue.fX = noiseX.noisePositionFractionValue; // Offset (0,-1)
- u = fPaintingData.fGradient[channel][b01].dot(fractionValue);
- SkScalar b = SkScalarInterp(u, v, sx);
- return SkScalarInterp(a, b, sy);
- }
- SkScalar SkPerlinNoiseShaderImpl::PerlinNoiseShaderContext::calculateTurbulenceValueForPoint(
- int channel, StitchData& stitchData, const SkPoint& point) const {
- const SkPerlinNoiseShaderImpl& perlinNoiseShader = static_cast<const SkPerlinNoiseShaderImpl&>(fShader);
- if (perlinNoiseShader.fStitchTiles) {
- // Set up TurbulenceInitial stitch values.
- stitchData = fPaintingData.fStitchDataInit;
- }
- SkScalar turbulenceFunctionResult = 0;
- SkPoint noiseVector(SkPoint::Make(point.x() * fPaintingData.fBaseFrequency.fX,
- point.y() * fPaintingData.fBaseFrequency.fY));
- SkScalar ratio = SK_Scalar1;
- for (int octave = 0; octave < perlinNoiseShader.fNumOctaves; ++octave) {
- SkScalar noise = noise2D(channel, stitchData, noiseVector);
- SkScalar numer = (perlinNoiseShader.fType == kFractalNoise_Type) ?
- noise : SkScalarAbs(noise);
- turbulenceFunctionResult += numer / ratio;
- noiseVector.fX *= 2;
- noiseVector.fY *= 2;
- ratio *= 2;
- if (perlinNoiseShader.fStitchTiles) {
- // Update stitch values
- stitchData = StitchData(SkIntToScalar(stitchData.fWidth) * 2,
- SkIntToScalar(stitchData.fHeight) * 2);
- }
- }
- // The value of turbulenceFunctionResult comes from ((turbulenceFunctionResult) + 1) / 2
- // by fractalNoise and (turbulenceFunctionResult) by turbulence.
- if (perlinNoiseShader.fType == kFractalNoise_Type) {
- turbulenceFunctionResult = SkScalarHalf(turbulenceFunctionResult + 1);
- }
- if (channel == 3) { // Scale alpha by paint value
- turbulenceFunctionResult *= SkIntToScalar(getPaintAlpha()) / 255;
- }
- // Clamp result
- return SkScalarPin(turbulenceFunctionResult, 0, SK_Scalar1);
- }
- ////////////////////////////////////////////////////////////////////////////////////////////////////
- // Improved Perlin Noise based on Java implementation found at http://mrl.nyu.edu/~perlin/noise/
- static SkScalar fade(SkScalar t) {
- return t * t * t * (t * (t * 6 - 15) + 10);
- }
- static SkScalar lerp(SkScalar t, SkScalar a, SkScalar b) {
- return a + t * (b - a);
- }
- static SkScalar grad(int hash, SkScalar x, SkScalar y, SkScalar z) {
- int h = hash & 15;
- SkScalar u = h < 8 ? x : y;
- SkScalar v = h < 4 ? y : h == 12 || h == 14 ? x : z;
- return ((h & 1) == 0 ? u : -u) + ((h & 2) == 0 ? v : -v);
- }
- SkScalar SkPerlinNoiseShaderImpl::PerlinNoiseShaderContext::calculateImprovedNoiseValueForPoint(
- int channel, const SkPoint& point) const {
- const SkPerlinNoiseShaderImpl& perlinNoiseShader = static_cast<const SkPerlinNoiseShaderImpl&>(fShader);
- SkScalar x = point.fX * perlinNoiseShader.fBaseFrequencyX;
- SkScalar y = point.fY * perlinNoiseShader.fBaseFrequencyY;
- // z offset between different channels, chosen arbitrarily
- static const SkScalar CHANNEL_DELTA = 1000.0f;
- SkScalar z = channel * CHANNEL_DELTA + perlinNoiseShader.fSeed;
- SkScalar result = 0;
- SkScalar ratio = SK_Scalar1;
- for (int i = 0; i < perlinNoiseShader.fNumOctaves; i++) {
- int X = SkScalarFloorToInt(x) & 255;
- int Y = SkScalarFloorToInt(y) & 255;
- int Z = SkScalarFloorToInt(z) & 255;
- SkScalar px = x - SkScalarFloorToScalar(x);
- SkScalar py = y - SkScalarFloorToScalar(y);
- SkScalar pz = z - SkScalarFloorToScalar(z);
- SkScalar u = fade(px);
- SkScalar v = fade(py);
- SkScalar w = fade(pz);
- uint8_t* permutations = improved_noise_permutations;
- int A = permutations[X] + Y;
- int AA = permutations[A] + Z;
- int AB = permutations[A + 1] + Z;
- int B = permutations[X + 1] + Y;
- int BA = permutations[B] + Z;
- int BB = permutations[B + 1] + Z;
- result += lerp(w, lerp(v, lerp(u, grad(permutations[AA ], px , py , pz ),
- grad(permutations[BA ], px - 1, py , pz )),
- lerp(u, grad(permutations[AB ], px , py - 1, pz ),
- grad(permutations[BB ], px - 1, py - 1, pz ))),
- lerp(v, lerp(u, grad(permutations[AA + 1], px , py , pz - 1),
- grad(permutations[BA + 1], px - 1, py , pz - 1)),
- lerp(u, grad(permutations[AB + 1], px , py - 1, pz - 1),
- grad(permutations[BB + 1], px - 1, py - 1, pz - 1)))) /
- ratio;
- x *= 2;
- y *= 2;
- ratio *= 2;
- }
- result = SkScalarClampMax((result + 1.0f) / 2.0f, 1.0f);
- return result;
- }
- ////////////////////////////////////////////////////////////////////////////////////////////////////
- SkPMColor SkPerlinNoiseShaderImpl::PerlinNoiseShaderContext::shade(
- const SkPoint& point, StitchData& stitchData) const {
- const SkPerlinNoiseShaderImpl& perlinNoiseShader = static_cast<const SkPerlinNoiseShaderImpl&>(fShader);
- SkPoint newPoint;
- fMatrix.mapPoints(&newPoint, &point, 1);
- newPoint.fX = SkScalarRoundToScalar(newPoint.fX);
- newPoint.fY = SkScalarRoundToScalar(newPoint.fY);
- U8CPU rgba[4];
- for (int channel = 3; channel >= 0; --channel) {
- SkScalar value;
- if (perlinNoiseShader.fType == kImprovedNoise_Type) {
- value = calculateImprovedNoiseValueForPoint(channel, newPoint);
- }
- else {
- value = calculateTurbulenceValueForPoint(channel, stitchData, newPoint);
- }
- rgba[channel] = SkScalarFloorToInt(255 * value);
- }
- return SkPreMultiplyARGB(rgba[3], rgba[0], rgba[1], rgba[2]);
- }
- #ifdef SK_ENABLE_LEGACY_SHADERCONTEXT
- SkShaderBase::Context* SkPerlinNoiseShaderImpl::onMakeContext(const ContextRec& rec,
- SkArenaAlloc* alloc) const {
- // should we pay attention to rec's device-colorspace?
- return alloc->make<PerlinNoiseShaderContext>(*this, rec);
- }
- #endif
- static inline SkMatrix total_matrix(const SkShaderBase::ContextRec& rec,
- const SkShaderBase& shader) {
- SkMatrix matrix = SkMatrix::Concat(*rec.fMatrix, shader.getLocalMatrix());
- if (rec.fLocalMatrix) {
- matrix.preConcat(*rec.fLocalMatrix);
- }
- return matrix;
- }
- SkPerlinNoiseShaderImpl::PerlinNoiseShaderContext::PerlinNoiseShaderContext(
- const SkPerlinNoiseShaderImpl& shader, const ContextRec& rec)
- : INHERITED(shader, rec)
- , fMatrix(total_matrix(rec, shader)) // used for temp storage, adjusted below
- , fPaintingData(shader.fTileSize, shader.fSeed, shader.fBaseFrequencyX,
- shader.fBaseFrequencyY, fMatrix)
- {
- // This (1,1) translation is due to WebKit's 1 based coordinates for the noise
- // (as opposed to 0 based, usually). The same adjustment is in the setData() function.
- fMatrix.setTranslate(-fMatrix.getTranslateX() + SK_Scalar1,
- -fMatrix.getTranslateY() + SK_Scalar1);
- }
- void SkPerlinNoiseShaderImpl::PerlinNoiseShaderContext::shadeSpan(
- int x, int y, SkPMColor result[], int count) {
- SkPoint point = SkPoint::Make(SkIntToScalar(x), SkIntToScalar(y));
- StitchData stitchData;
- for (int i = 0; i < count; ++i) {
- result[i] = shade(point, stitchData);
- point.fX += SK_Scalar1;
- }
- }
- /////////////////////////////////////////////////////////////////////
- #if SK_SUPPORT_GPU
- class GrGLPerlinNoise : public GrGLSLFragmentProcessor {
- public:
- void emitCode(EmitArgs&) override;
- static inline void GenKey(const GrProcessor&, const GrShaderCaps&, GrProcessorKeyBuilder* b);
- protected:
- void onSetData(const GrGLSLProgramDataManager&, const GrFragmentProcessor&) override;
- private:
- GrGLSLProgramDataManager::UniformHandle fStitchDataUni;
- GrGLSLProgramDataManager::UniformHandle fBaseFrequencyUni;
- typedef GrGLSLFragmentProcessor INHERITED;
- };
- /////////////////////////////////////////////////////////////////////
- class GrPerlinNoise2Effect : public GrFragmentProcessor {
- public:
- static std::unique_ptr<GrFragmentProcessor> Make(
- SkPerlinNoiseShaderImpl::Type type, int numOctaves, bool stitchTiles,
- std::unique_ptr<SkPerlinNoiseShaderImpl::PaintingData> paintingData,
- sk_sp<GrTextureProxy> permutationsProxy, sk_sp<GrTextureProxy> noiseProxy,
- const SkMatrix& matrix) {
- return std::unique_ptr<GrFragmentProcessor>(new GrPerlinNoise2Effect(
- type, numOctaves, stitchTiles, std::move(paintingData),
- std::move(permutationsProxy), std::move(noiseProxy), matrix));
- }
- const char* name() const override { return "PerlinNoise"; }
- std::unique_ptr<GrFragmentProcessor> clone() const override {
- return std::unique_ptr<GrFragmentProcessor>(new GrPerlinNoise2Effect(*this));
- }
- const SkPerlinNoiseShaderImpl::StitchData& stitchData() const { return fPaintingData->fStitchDataInit; }
- SkPerlinNoiseShaderImpl::Type type() const { return fType; }
- bool stitchTiles() const { return fStitchTiles; }
- const SkVector& baseFrequency() const { return fPaintingData->fBaseFrequency; }
- int numOctaves() const { return fNumOctaves; }
- const SkMatrix& matrix() const { return fCoordTransform.getMatrix(); }
- private:
- GrGLSLFragmentProcessor* onCreateGLSLInstance() const override {
- return new GrGLPerlinNoise;
- }
- virtual void onGetGLSLProcessorKey(const GrShaderCaps& caps,
- GrProcessorKeyBuilder* b) const override {
- GrGLPerlinNoise::GenKey(*this, caps, b);
- }
- bool onIsEqual(const GrFragmentProcessor& sBase) const override {
- const GrPerlinNoise2Effect& s = sBase.cast<GrPerlinNoise2Effect>();
- return fType == s.fType &&
- fPaintingData->fBaseFrequency == s.fPaintingData->fBaseFrequency &&
- fNumOctaves == s.fNumOctaves &&
- fStitchTiles == s.fStitchTiles &&
- fPaintingData->fStitchDataInit == s.fPaintingData->fStitchDataInit;
- }
- GrPerlinNoise2Effect(SkPerlinNoiseShaderImpl::Type type, int numOctaves, bool stitchTiles,
- std::unique_ptr<SkPerlinNoiseShaderImpl::PaintingData> paintingData,
- sk_sp<GrTextureProxy> permutationsProxy,
- sk_sp<GrTextureProxy> noiseProxy,
- const SkMatrix& matrix)
- : INHERITED(kGrPerlinNoise2Effect_ClassID, kNone_OptimizationFlags)
- , fType(type)
- , fNumOctaves(numOctaves)
- , fStitchTiles(stitchTiles)
- , fPermutationsSampler(std::move(permutationsProxy))
- , fNoiseSampler(std::move(noiseProxy))
- , fPaintingData(std::move(paintingData)) {
- this->setTextureSamplerCnt(2);
- fCoordTransform = GrCoordTransform(matrix);
- this->addCoordTransform(&fCoordTransform);
- }
- GrPerlinNoise2Effect(const GrPerlinNoise2Effect& that)
- : INHERITED(kGrPerlinNoise2Effect_ClassID, kNone_OptimizationFlags)
- , fType(that.fType)
- , fCoordTransform(that.fCoordTransform)
- , fNumOctaves(that.fNumOctaves)
- , fStitchTiles(that.fStitchTiles)
- , fPermutationsSampler(that.fPermutationsSampler)
- , fNoiseSampler(that.fNoiseSampler)
- , fPaintingData(new SkPerlinNoiseShaderImpl::PaintingData(*that.fPaintingData)) {
- this->setTextureSamplerCnt(2);
- this->addCoordTransform(&fCoordTransform);
- }
- const TextureSampler& onTextureSampler(int i) const override {
- return IthTextureSampler(i, fPermutationsSampler, fNoiseSampler);
- }
- GR_DECLARE_FRAGMENT_PROCESSOR_TEST
- SkPerlinNoiseShaderImpl::Type fType;
- GrCoordTransform fCoordTransform;
- int fNumOctaves;
- bool fStitchTiles;
- TextureSampler fPermutationsSampler;
- TextureSampler fNoiseSampler;
- std::unique_ptr<SkPerlinNoiseShaderImpl::PaintingData> fPaintingData;
- typedef GrFragmentProcessor INHERITED;
- };
- /////////////////////////////////////////////////////////////////////
- GR_DEFINE_FRAGMENT_PROCESSOR_TEST(GrPerlinNoise2Effect);
- #if GR_TEST_UTILS
- std::unique_ptr<GrFragmentProcessor> GrPerlinNoise2Effect::TestCreate(GrProcessorTestData* d) {
- int numOctaves = d->fRandom->nextRangeU(2, 10);
- bool stitchTiles = d->fRandom->nextBool();
- SkScalar seed = SkIntToScalar(d->fRandom->nextU());
- SkISize tileSize = SkISize::Make(d->fRandom->nextRangeU(4, 4096),
- d->fRandom->nextRangeU(4, 4096));
- SkScalar baseFrequencyX = d->fRandom->nextRangeScalar(0.01f,
- 0.99f);
- SkScalar baseFrequencyY = d->fRandom->nextRangeScalar(0.01f,
- 0.99f);
- sk_sp<SkShader> shader(d->fRandom->nextBool() ?
- SkPerlinNoiseShader::MakeFractalNoise(baseFrequencyX, baseFrequencyY, numOctaves, seed,
- stitchTiles ? &tileSize : nullptr) :
- SkPerlinNoiseShader::MakeTurbulence(baseFrequencyX, baseFrequencyY, numOctaves, seed,
- stitchTiles ? &tileSize : nullptr));
- GrTest::TestAsFPArgs asFPArgs(d);
- return as_SB(shader)->asFragmentProcessor(asFPArgs.args());
- }
- #endif
- void GrGLPerlinNoise::emitCode(EmitArgs& args) {
- const GrPerlinNoise2Effect& pne = args.fFp.cast<GrPerlinNoise2Effect>();
- GrGLSLFragmentBuilder* fragBuilder = args.fFragBuilder;
- GrGLSLUniformHandler* uniformHandler = args.fUniformHandler;
- SkString vCoords = fragBuilder->ensureCoords2D(args.fTransformedCoords[0]);
- fBaseFrequencyUni = uniformHandler->addUniform(kFragment_GrShaderFlag, kHalf2_GrSLType,
- "baseFrequency");
- const char* baseFrequencyUni = uniformHandler->getUniformCStr(fBaseFrequencyUni);
- const char* stitchDataUni = nullptr;
- if (pne.stitchTiles()) {
- fStitchDataUni = uniformHandler->addUniform(kFragment_GrShaderFlag, kHalf2_GrSLType,
- "stitchData");
- stitchDataUni = uniformHandler->getUniformCStr(fStitchDataUni);
- }
- // There are 4 lines, so the center of each line is 1/8, 3/8, 5/8 and 7/8
- const char* chanCoordR = "0.125";
- const char* chanCoordG = "0.375";
- const char* chanCoordB = "0.625";
- const char* chanCoordA = "0.875";
- const char* chanCoord = "chanCoord";
- const char* stitchData = "stitchData";
- const char* ratio = "ratio";
- const char* noiseVec = "noiseVec";
- const char* noiseSmooth = "noiseSmooth";
- const char* floorVal = "floorVal";
- const char* fractVal = "fractVal";
- const char* uv = "uv";
- const char* ab = "ab";
- const char* latticeIdx = "latticeIdx";
- const char* bcoords = "bcoords";
- const char* lattice = "lattice";
- const char* inc8bit = "0.00390625"; // 1.0 / 256.0
- // This is the math to convert the two 16bit integer packed into rgba 8 bit input into a
- // [-1,1] vector and perform a dot product between that vector and the provided vector.
- const char* dotLattice = "dot(((%s.ga + %s.rb * half2(%s)) * half2(2.0) - half2(1.0)), %s);";
- // Add noise function
- const GrShaderVar gPerlinNoiseArgs[] = {
- GrShaderVar(chanCoord, kHalf_GrSLType),
- GrShaderVar(noiseVec, kHalf2_GrSLType)
- };
- const GrShaderVar gPerlinNoiseStitchArgs[] = {
- GrShaderVar(chanCoord, kHalf_GrSLType),
- GrShaderVar(noiseVec, kHalf2_GrSLType),
- GrShaderVar(stitchData, kHalf2_GrSLType)
- };
- SkString noiseCode;
- noiseCode.appendf("\thalf4 %s;\n", floorVal);
- noiseCode.appendf("\t%s.xy = floor(%s);\n", floorVal, noiseVec);
- noiseCode.appendf("\t%s.zw = %s.xy + half2(1.0);\n", floorVal, floorVal);
- noiseCode.appendf("\thalf2 %s = fract(%s);\n", fractVal, noiseVec);
- // smooth curve : t * t * (3 - 2 * t)
- noiseCode.appendf("\n\thalf2 %s = %s * %s * (half2(3.0) - half2(2.0) * %s);",
- noiseSmooth, fractVal, fractVal, fractVal);
- // Adjust frequencies if we're stitching tiles
- if (pne.stitchTiles()) {
- noiseCode.appendf("\n\tif(%s.x >= %s.x) { %s.x -= %s.x; }",
- floorVal, stitchData, floorVal, stitchData);
- noiseCode.appendf("\n\tif(%s.y >= %s.y) { %s.y -= %s.y; }",
- floorVal, stitchData, floorVal, stitchData);
- noiseCode.appendf("\n\tif(%s.z >= %s.x) { %s.z -= %s.x; }",
- floorVal, stitchData, floorVal, stitchData);
- noiseCode.appendf("\n\tif(%s.w >= %s.y) { %s.w -= %s.y; }",
- floorVal, stitchData, floorVal, stitchData);
- }
- // Get texture coordinates and normalize
- noiseCode.appendf("\n\t%s = fract(floor(mod(%s, 256.0)) / half4(256.0));\n",
- floorVal, floorVal);
- // Get permutation for x
- {
- SkString xCoords("");
- xCoords.appendf("half2(%s.x, 0.5)", floorVal);
- noiseCode.appendf("\n\thalf2 %s;\n\t%s.x = ", latticeIdx, latticeIdx);
- fragBuilder->appendTextureLookup(&noiseCode, args.fTexSamplers[0], xCoords.c_str(),
- kHalf2_GrSLType);
- noiseCode.append(".r;");
- }
- // Get permutation for x + 1
- {
- SkString xCoords("");
- xCoords.appendf("half2(%s.z, 0.5)", floorVal);
- noiseCode.appendf("\n\t%s.y = ", latticeIdx);
- fragBuilder->appendTextureLookup(&noiseCode, args.fTexSamplers[0], xCoords.c_str(),
- kHalf2_GrSLType);
- noiseCode.append(".r;");
- }
- #if defined(SK_BUILD_FOR_ANDROID)
- // Android rounding for Tegra devices, like, for example: Xoom (Tegra 2), Nexus 7 (Tegra 3).
- // The issue is that colors aren't accurate enough on Tegra devices. For example, if an 8 bit
- // value of 124 (or 0.486275 here) is entered, we can get a texture value of 123.513725
- // (or 0.484368 here). The following rounding operation prevents these precision issues from
- // affecting the result of the noise by making sure that we only have multiples of 1/255.
- // (Note that 1/255 is about 0.003921569, which is the value used here).
- noiseCode.appendf("\n\t%s = floor(%s * half2(255.0) + half2(0.5)) * half2(0.003921569);",
- latticeIdx, latticeIdx);
- #endif
- // Get (x,y) coordinates with the permutated x
- noiseCode.appendf("\n\thalf4 %s = fract(%s.xyxy + %s.yyww);", bcoords, latticeIdx, floorVal);
- noiseCode.appendf("\n\n\thalf2 %s;", uv);
- // Compute u, at offset (0,0)
- {
- SkString latticeCoords("");
- latticeCoords.appendf("half2(%s.x, %s)", bcoords, chanCoord);
- noiseCode.appendf("\n\thalf4 %s = ", lattice);
- fragBuilder->appendTextureLookup(&noiseCode, args.fTexSamplers[1], latticeCoords.c_str(),
- kHalf2_GrSLType);
- noiseCode.appendf(".bgra;\n\t%s.x = ", uv);
- noiseCode.appendf(dotLattice, lattice, lattice, inc8bit, fractVal);
- }
- noiseCode.appendf("\n\t%s.x -= 1.0;", fractVal);
- // Compute v, at offset (-1,0)
- {
- SkString latticeCoords("");
- latticeCoords.appendf("half2(%s.y, %s)", bcoords, chanCoord);
- noiseCode.append("\n\tlattice = ");
- fragBuilder->appendTextureLookup(&noiseCode, args.fTexSamplers[1], latticeCoords.c_str(),
- kHalf2_GrSLType);
- noiseCode.appendf(".bgra;\n\t%s.y = ", uv);
- noiseCode.appendf(dotLattice, lattice, lattice, inc8bit, fractVal);
- }
- // Compute 'a' as a linear interpolation of 'u' and 'v'
- noiseCode.appendf("\n\thalf2 %s;", ab);
- noiseCode.appendf("\n\t%s.x = mix(%s.x, %s.y, %s.x);", ab, uv, uv, noiseSmooth);
- noiseCode.appendf("\n\t%s.y -= 1.0;", fractVal);
- // Compute v, at offset (-1,-1)
- {
- SkString latticeCoords("");
- latticeCoords.appendf("half2(%s.w, %s)", bcoords, chanCoord);
- noiseCode.append("\n\tlattice = ");
- fragBuilder->appendTextureLookup(&noiseCode, args.fTexSamplers[1], latticeCoords.c_str(),
- kHalf2_GrSLType);
- noiseCode.appendf(".bgra;\n\t%s.y = ", uv);
- noiseCode.appendf(dotLattice, lattice, lattice, inc8bit, fractVal);
- }
- noiseCode.appendf("\n\t%s.x += 1.0;", fractVal);
- // Compute u, at offset (0,-1)
- {
- SkString latticeCoords("");
- latticeCoords.appendf("half2(%s.z, %s)", bcoords, chanCoord);
- noiseCode.append("\n\tlattice = ");
- fragBuilder->appendTextureLookup(&noiseCode, args.fTexSamplers[1], latticeCoords.c_str(),
- kHalf2_GrSLType);
- noiseCode.appendf(".bgra;\n\t%s.x = ", uv);
- noiseCode.appendf(dotLattice, lattice, lattice, inc8bit, fractVal);
- }
- // Compute 'b' as a linear interpolation of 'u' and 'v'
- noiseCode.appendf("\n\t%s.y = mix(%s.x, %s.y, %s.x);", ab, uv, uv, noiseSmooth);
- // Compute the noise as a linear interpolation of 'a' and 'b'
- noiseCode.appendf("\n\treturn mix(%s.x, %s.y, %s.y);\n", ab, ab, noiseSmooth);
- SkString noiseFuncName;
- if (pne.stitchTiles()) {
- fragBuilder->emitFunction(kHalf_GrSLType,
- "perlinnoise", SK_ARRAY_COUNT(gPerlinNoiseStitchArgs),
- gPerlinNoiseStitchArgs, noiseCode.c_str(), &noiseFuncName);
- } else {
- fragBuilder->emitFunction(kHalf_GrSLType,
- "perlinnoise", SK_ARRAY_COUNT(gPerlinNoiseArgs),
- gPerlinNoiseArgs, noiseCode.c_str(), &noiseFuncName);
- }
- // There are rounding errors if the floor operation is not performed here
- fragBuilder->codeAppendf("\n\t\thalf2 %s = half2(floor(%s.xy) * %s);",
- noiseVec, vCoords.c_str(), baseFrequencyUni);
- // Clear the color accumulator
- fragBuilder->codeAppendf("\n\t\t%s = half4(0.0);", args.fOutputColor);
- if (pne.stitchTiles()) {
- // Set up TurbulenceInitial stitch values.
- fragBuilder->codeAppendf("\n\t\thalf2 %s = %s;", stitchData, stitchDataUni);
- }
- fragBuilder->codeAppendf("\n\t\thalf %s = 1.0;", ratio);
- // Loop over all octaves
- fragBuilder->codeAppendf("for (int octave = 0; octave < %d; ++octave) {", pne.numOctaves());
- fragBuilder->codeAppendf("\n\t\t\t%s += ", args.fOutputColor);
- if (pne.type() != SkPerlinNoiseShaderImpl::kFractalNoise_Type) {
- fragBuilder->codeAppend("abs(");
- }
- if (pne.stitchTiles()) {
- fragBuilder->codeAppendf(
- "half4(\n\t\t\t\t%s(%s, %s, %s),\n\t\t\t\t%s(%s, %s, %s),"
- "\n\t\t\t\t%s(%s, %s, %s),\n\t\t\t\t%s(%s, %s, %s))",
- noiseFuncName.c_str(), chanCoordR, noiseVec, stitchData,
- noiseFuncName.c_str(), chanCoordG, noiseVec, stitchData,
- noiseFuncName.c_str(), chanCoordB, noiseVec, stitchData,
- noiseFuncName.c_str(), chanCoordA, noiseVec, stitchData);
- } else {
- fragBuilder->codeAppendf(
- "half4(\n\t\t\t\t%s(%s, %s),\n\t\t\t\t%s(%s, %s),"
- "\n\t\t\t\t%s(%s, %s),\n\t\t\t\t%s(%s, %s))",
- noiseFuncName.c_str(), chanCoordR, noiseVec,
- noiseFuncName.c_str(), chanCoordG, noiseVec,
- noiseFuncName.c_str(), chanCoordB, noiseVec,
- noiseFuncName.c_str(), chanCoordA, noiseVec);
- }
- if (pne.type() != SkPerlinNoiseShaderImpl::kFractalNoise_Type) {
- fragBuilder->codeAppendf(")"); // end of "abs("
- }
- fragBuilder->codeAppendf(" * %s;", ratio);
- fragBuilder->codeAppendf("\n\t\t\t%s *= half2(2.0);", noiseVec);
- fragBuilder->codeAppendf("\n\t\t\t%s *= 0.5;", ratio);
- if (pne.stitchTiles()) {
- fragBuilder->codeAppendf("\n\t\t\t%s *= half2(2.0);", stitchData);
- }
- fragBuilder->codeAppend("\n\t\t}"); // end of the for loop on octaves
- if (pne.type() == SkPerlinNoiseShaderImpl::kFractalNoise_Type) {
- // The value of turbulenceFunctionResult comes from ((turbulenceFunctionResult) + 1) / 2
- // by fractalNoise and (turbulenceFunctionResult) by turbulence.
- fragBuilder->codeAppendf("\n\t\t%s = %s * half4(0.5) + half4(0.5);",
- args.fOutputColor,args.fOutputColor);
- }
- // Clamp values
- fragBuilder->codeAppendf("\n\t\t%s = saturate(%s);", args.fOutputColor, args.fOutputColor);
- // Pre-multiply the result
- fragBuilder->codeAppendf("\n\t\t%s = half4(%s.rgb * %s.aaa, %s.a);\n",
- args.fOutputColor, args.fOutputColor,
- args.fOutputColor, args.fOutputColor);
- }
- void GrGLPerlinNoise::GenKey(const GrProcessor& processor, const GrShaderCaps&,
- GrProcessorKeyBuilder* b) {
- const GrPerlinNoise2Effect& turbulence = processor.cast<GrPerlinNoise2Effect>();
- uint32_t key = turbulence.numOctaves();
- key = key << 3; // Make room for next 3 bits
- switch (turbulence.type()) {
- case SkPerlinNoiseShaderImpl::kFractalNoise_Type:
- key |= 0x1;
- break;
- case SkPerlinNoiseShaderImpl::kTurbulence_Type:
- key |= 0x2;
- break;
- default:
- // leave key at 0
- break;
- }
- if (turbulence.stitchTiles()) {
- key |= 0x4; // Flip the 3rd bit if tile stitching is on
- }
- b->add32(key);
- }
- void GrGLPerlinNoise::onSetData(const GrGLSLProgramDataManager& pdman,
- const GrFragmentProcessor& processor) {
- INHERITED::onSetData(pdman, processor);
- const GrPerlinNoise2Effect& turbulence = processor.cast<GrPerlinNoise2Effect>();
- const SkVector& baseFrequency = turbulence.baseFrequency();
- pdman.set2f(fBaseFrequencyUni, baseFrequency.fX, baseFrequency.fY);
- if (turbulence.stitchTiles()) {
- const SkPerlinNoiseShaderImpl::StitchData& stitchData = turbulence.stitchData();
- pdman.set2f(fStitchDataUni, SkIntToScalar(stitchData.fWidth),
- SkIntToScalar(stitchData.fHeight));
- }
- }
- /////////////////////////////////////////////////////////////////////
- class GrGLImprovedPerlinNoise : public GrGLSLFragmentProcessor {
- public:
- void emitCode(EmitArgs&) override;
- static inline void GenKey(const GrProcessor&, const GrShaderCaps&, GrProcessorKeyBuilder*);
- protected:
- void onSetData(const GrGLSLProgramDataManager&, const GrFragmentProcessor&) override;
- private:
- GrGLSLProgramDataManager::UniformHandle fZUni;
- GrGLSLProgramDataManager::UniformHandle fBaseFrequencyUni;
- typedef GrGLSLFragmentProcessor INHERITED;
- };
- /////////////////////////////////////////////////////////////////////
- class GrImprovedPerlinNoiseEffect : public GrFragmentProcessor {
- public:
- static std::unique_ptr<GrFragmentProcessor> Make(
- int octaves, SkScalar z,
- std::unique_ptr<SkPerlinNoiseShaderImpl::PaintingData> paintingData,
- sk_sp<GrTextureProxy> permutationsProxy, sk_sp<GrTextureProxy> gradientProxy,
- const SkMatrix& matrix) {
- return std::unique_ptr<GrFragmentProcessor>(new GrImprovedPerlinNoiseEffect(
- octaves, z, std::move(paintingData), std::move(permutationsProxy),
- std::move(gradientProxy), matrix));
- }
- const char* name() const override { return "ImprovedPerlinNoise"; }
- std::unique_ptr<GrFragmentProcessor> clone() const override {
- return std::unique_ptr<GrFragmentProcessor>(new GrImprovedPerlinNoiseEffect(*this));
- }
- const SkVector& baseFrequency() const { return fPaintingData->fBaseFrequency; }
- SkScalar z() const { return fZ; }
- int octaves() const { return fOctaves; }
- const SkMatrix& matrix() const { return fCoordTransform.getMatrix(); }
- private:
- GrGLSLFragmentProcessor* onCreateGLSLInstance() const override {
- return new GrGLImprovedPerlinNoise;
- }
- void onGetGLSLProcessorKey(const GrShaderCaps& caps, GrProcessorKeyBuilder* b) const override {
- GrGLImprovedPerlinNoise::GenKey(*this, caps, b);
- }
- bool onIsEqual(const GrFragmentProcessor& sBase) const override {
- const GrImprovedPerlinNoiseEffect& s = sBase.cast<GrImprovedPerlinNoiseEffect>();
- return fZ == fZ &&
- fPaintingData->fBaseFrequency == s.fPaintingData->fBaseFrequency;
- }
- GrImprovedPerlinNoiseEffect(int octaves, SkScalar z,
- std::unique_ptr<SkPerlinNoiseShaderImpl::PaintingData> paintingData,
- sk_sp<GrTextureProxy> permutationsProxy,
- sk_sp<GrTextureProxy> gradientProxy,
- const SkMatrix& matrix)
- : INHERITED(kGrImprovedPerlinNoiseEffect_ClassID, kNone_OptimizationFlags)
- , fOctaves(octaves)
- , fZ(z)
- , fPermutationsSampler(std::move(permutationsProxy))
- , fGradientSampler(std::move(gradientProxy))
- , fPaintingData(std::move(paintingData)) {
- this->setTextureSamplerCnt(2);
- fCoordTransform = GrCoordTransform(matrix);
- this->addCoordTransform(&fCoordTransform);
- }
- GrImprovedPerlinNoiseEffect(const GrImprovedPerlinNoiseEffect& that)
- : INHERITED(kGrImprovedPerlinNoiseEffect_ClassID, kNone_OptimizationFlags)
- , fCoordTransform(that.fCoordTransform)
- , fOctaves(that.fOctaves)
- , fZ(that.fZ)
- , fPermutationsSampler(that.fPermutationsSampler)
- , fGradientSampler(that.fGradientSampler)
- , fPaintingData(new SkPerlinNoiseShaderImpl::PaintingData(*that.fPaintingData)) {
- this->setTextureSamplerCnt(2);
- this->addCoordTransform(&fCoordTransform);
- }
- const TextureSampler& onTextureSampler(int i) const override {
- return IthTextureSampler(i, fPermutationsSampler, fGradientSampler);
- }
- GR_DECLARE_FRAGMENT_PROCESSOR_TEST
- GrCoordTransform fCoordTransform;
- int fOctaves;
- SkScalar fZ;
- TextureSampler fPermutationsSampler;
- TextureSampler fGradientSampler;
- std::unique_ptr<SkPerlinNoiseShaderImpl::PaintingData> fPaintingData;
- typedef GrFragmentProcessor INHERITED;
- };
- /////////////////////////////////////////////////////////////////////
- GR_DEFINE_FRAGMENT_PROCESSOR_TEST(GrImprovedPerlinNoiseEffect);
- #if GR_TEST_UTILS
- std::unique_ptr<GrFragmentProcessor> GrImprovedPerlinNoiseEffect::TestCreate(
- GrProcessorTestData* d) {
- SkScalar baseFrequencyX = d->fRandom->nextRangeScalar(0.01f,
- 0.99f);
- SkScalar baseFrequencyY = d->fRandom->nextRangeScalar(0.01f,
- 0.99f);
- int numOctaves = d->fRandom->nextRangeU(2, 10);
- SkScalar z = SkIntToScalar(d->fRandom->nextU());
- sk_sp<SkShader> shader(SkPerlinNoiseShader::MakeImprovedNoise(baseFrequencyX,
- baseFrequencyY,
- numOctaves,
- z));
- GrTest::TestAsFPArgs asFPArgs(d);
- return as_SB(shader)->asFragmentProcessor(asFPArgs.args());
- }
- #endif
- void GrGLImprovedPerlinNoise::emitCode(EmitArgs& args) {
- const GrImprovedPerlinNoiseEffect& pne = args.fFp.cast<GrImprovedPerlinNoiseEffect>();
- GrGLSLFragmentBuilder* fragBuilder = args.fFragBuilder;
- GrGLSLUniformHandler* uniformHandler = args.fUniformHandler;
- SkString vCoords = fragBuilder->ensureCoords2D(args.fTransformedCoords[0]);
- fBaseFrequencyUni = uniformHandler->addUniform(kFragment_GrShaderFlag, kHalf2_GrSLType,
- "baseFrequency");
- const char* baseFrequencyUni = uniformHandler->getUniformCStr(fBaseFrequencyUni);
- fZUni = uniformHandler->addUniform(kFragment_GrShaderFlag, kHalf_GrSLType, "z");
- const char* zUni = uniformHandler->getUniformCStr(fZUni);
- // fade function
- const GrShaderVar fadeArgs[] = {
- GrShaderVar("t", kHalf3_GrSLType)
- };
- SkString fadeFuncName;
- fragBuilder->emitFunction(kHalf3_GrSLType, "fade", SK_ARRAY_COUNT(fadeArgs),
- fadeArgs,
- "return t * t * t * (t * (t * 6.0 - 15.0) + 10.0);",
- &fadeFuncName);
- // perm function
- const GrShaderVar permArgs[] = {
- GrShaderVar("x", kHalf_GrSLType)
- };
- SkString permFuncName;
- SkString permCode("return ");
- // FIXME even though I'm creating these textures with kRepeat_TileMode, they're clamped. Not
- // sure why. Using fract() (here and the next texture lookup) as a workaround.
- fragBuilder->appendTextureLookup(&permCode, args.fTexSamplers[0], "float2(fract(x / 256.0), 0.0)",
- kHalf2_GrSLType);
- permCode.append(".r * 255.0;");
- fragBuilder->emitFunction(kHalf_GrSLType, "perm", SK_ARRAY_COUNT(permArgs), permArgs,
- permCode.c_str(), &permFuncName);
- // grad function
- const GrShaderVar gradArgs[] = {
- GrShaderVar("x", kHalf_GrSLType),
- GrShaderVar("p", kHalf3_GrSLType)
- };
- SkString gradFuncName;
- SkString gradCode("return half(dot(");
- fragBuilder->appendTextureLookup(&gradCode, args.fTexSamplers[1], "float2(fract(x / 16.0), 0.0)",
- kHalf2_GrSLType);
- gradCode.append(".rgb * 255.0 - float3(1.0), p));");
- fragBuilder->emitFunction(kHalf_GrSLType, "grad", SK_ARRAY_COUNT(gradArgs), gradArgs,
- gradCode.c_str(), &gradFuncName);
- // lerp function
- const GrShaderVar lerpArgs[] = {
- GrShaderVar("a", kHalf_GrSLType),
- GrShaderVar("b", kHalf_GrSLType),
- GrShaderVar("w", kHalf_GrSLType)
- };
- SkString lerpFuncName;
- fragBuilder->emitFunction(kHalf_GrSLType, "lerp", SK_ARRAY_COUNT(lerpArgs), lerpArgs,
- "return a + w * (b - a);", &lerpFuncName);
- // noise function
- const GrShaderVar noiseArgs[] = {
- GrShaderVar("p", kHalf3_GrSLType),
- };
- SkString noiseFuncName;
- SkString noiseCode;
- noiseCode.append("half3 P = mod(floor(p), 256.0);");
- noiseCode.append("p -= floor(p);");
- noiseCode.appendf("half3 f = %s(p);", fadeFuncName.c_str());
- noiseCode.appendf("half A = %s(P.x) + P.y;", permFuncName.c_str());
- noiseCode.appendf("half AA = %s(A) + P.z;", permFuncName.c_str());
- noiseCode.appendf("half AB = %s(A + 1.0) + P.z;", permFuncName.c_str());
- noiseCode.appendf("half B = %s(P.x + 1.0) + P.y;", permFuncName.c_str());
- noiseCode.appendf("half BA = %s(B) + P.z;", permFuncName.c_str());
- noiseCode.appendf("half BB = %s(B + 1.0) + P.z;", permFuncName.c_str());
- noiseCode.appendf("half result = %s(", lerpFuncName.c_str());
- noiseCode.appendf("%s(%s(%s(%s(AA), p),", lerpFuncName.c_str(), lerpFuncName.c_str(),
- gradFuncName.c_str(), permFuncName.c_str());
- noiseCode.appendf("%s(%s(BA), p + half3(-1.0, 0.0, 0.0)), f.x),", gradFuncName.c_str(),
- permFuncName.c_str());
- noiseCode.appendf("%s(%s(%s(AB), p + half3(0.0, -1.0, 0.0)),", lerpFuncName.c_str(),
- gradFuncName.c_str(), permFuncName.c_str());
- noiseCode.appendf("%s(%s(BB), p + half3(-1.0, -1.0, 0.0)), f.x), f.y),",
- gradFuncName.c_str(), permFuncName.c_str());
- noiseCode.appendf("%s(%s(%s(%s(AA + 1.0), p + half3(0.0, 0.0, -1.0)),",
- lerpFuncName.c_str(), lerpFuncName.c_str(), gradFuncName.c_str(),
- permFuncName.c_str());
- noiseCode.appendf("%s(%s(BA + 1.0), p + half3(-1.0, 0.0, -1.0)), f.x),",
- gradFuncName.c_str(), permFuncName.c_str());
- noiseCode.appendf("%s(%s(%s(AB + 1.0), p + half3(0.0, -1.0, -1.0)),",
- lerpFuncName.c_str(), gradFuncName.c_str(), permFuncName.c_str());
- noiseCode.appendf("%s(%s(BB + 1.0), p + half3(-1.0, -1.0, -1.0)), f.x), f.y), f.z);",
- gradFuncName.c_str(), permFuncName.c_str());
- noiseCode.append("return result;");
- fragBuilder->emitFunction(kHalf_GrSLType, "noise", SK_ARRAY_COUNT(noiseArgs), noiseArgs,
- noiseCode.c_str(), &noiseFuncName);
- // noiseOctaves function
- const GrShaderVar noiseOctavesArgs[] = {
- GrShaderVar("p", kHalf3_GrSLType)
- };
- SkString noiseOctavesFuncName;
- SkString noiseOctavesCode;
- noiseOctavesCode.append("half result = 0.0;");
- noiseOctavesCode.append("half ratio = 1.0;");
- noiseOctavesCode.appendf("for (half i = 0.0; i < %d; i++) {", pne.octaves());
- noiseOctavesCode.appendf("result += %s(p) / ratio;", noiseFuncName.c_str());
- noiseOctavesCode.append("p *= 2.0;");
- noiseOctavesCode.append("ratio *= 2.0;");
- noiseOctavesCode.append("}");
- noiseOctavesCode.append("return (result + 1.0) / 2.0;");
- fragBuilder->emitFunction(kHalf_GrSLType, "noiseOctaves", SK_ARRAY_COUNT(noiseOctavesArgs),
- noiseOctavesArgs, noiseOctavesCode.c_str(), &noiseOctavesFuncName);
- fragBuilder->codeAppendf("half2 coords = half2(%s * %s);", vCoords.c_str(), baseFrequencyUni);
- fragBuilder->codeAppendf("half r = %s(half3(coords, %s));", noiseOctavesFuncName.c_str(),
- zUni);
- fragBuilder->codeAppendf("half g = %s(half3(coords, %s + 0000.0));",
- noiseOctavesFuncName.c_str(), zUni);
- fragBuilder->codeAppendf("half b = %s(half3(coords, %s + 0000.0));",
- noiseOctavesFuncName.c_str(), zUni);
- fragBuilder->codeAppendf("half a = %s(half3(coords, %s + 0000.0));",
- noiseOctavesFuncName.c_str(), zUni);
- fragBuilder->codeAppendf("%s = half4(r, g, b, a);", args.fOutputColor);
- // Clamp values
- fragBuilder->codeAppendf("%s = saturate(%s);", args.fOutputColor, args.fOutputColor);
- // Pre-multiply the result
- fragBuilder->codeAppendf("\n\t\t%s = half4(%s.rgb * %s.aaa, %s.a);\n",
- args.fOutputColor, args.fOutputColor,
- args.fOutputColor, args.fOutputColor);
- }
- void GrGLImprovedPerlinNoise::GenKey(const GrProcessor& processor, const GrShaderCaps&,
- GrProcessorKeyBuilder* b) {
- const GrImprovedPerlinNoiseEffect& pne = processor.cast<GrImprovedPerlinNoiseEffect>();
- b->add32(pne.octaves());
- }
- void GrGLImprovedPerlinNoise::onSetData(const GrGLSLProgramDataManager& pdman,
- const GrFragmentProcessor& processor) {
- INHERITED::onSetData(pdman, processor);
- const GrImprovedPerlinNoiseEffect& noise = processor.cast<GrImprovedPerlinNoiseEffect>();
- const SkVector& baseFrequency = noise.baseFrequency();
- pdman.set2f(fBaseFrequencyUni, baseFrequency.fX, baseFrequency.fY);
- pdman.set1f(fZUni, noise.z());
- }
- /////////////////////////////////////////////////////////////////////
- std::unique_ptr<GrFragmentProcessor> SkPerlinNoiseShaderImpl::asFragmentProcessor(
- const GrFPArgs& args) const {
- SkASSERT(args.fContext);
- const auto localMatrix = this->totalLocalMatrix(args.fPreLocalMatrix, args.fPostLocalMatrix);
- const auto paintMatrix = SkMatrix::Concat(*args.fViewMatrix, *localMatrix);
- // Either we don't stitch tiles, either we have a valid tile size
- SkASSERT(!fStitchTiles || !fTileSize.isEmpty());
- std::unique_ptr<SkPerlinNoiseShaderImpl::PaintingData> paintingData =
- skstd::make_unique<SkPerlinNoiseShaderImpl::PaintingData>(fTileSize,
- fSeed,
- fBaseFrequencyX,
- fBaseFrequencyY,
- paintMatrix);
- SkMatrix m = *args.fViewMatrix;
- m.setTranslateX(-localMatrix->getTranslateX() + SK_Scalar1);
- m.setTranslateY(-localMatrix->getTranslateY() + SK_Scalar1);
- auto proxyProvider = args.fContext->priv().proxyProvider();
- if (fType == kImprovedNoise_Type) {
- // Need to assert that the textures we'll create are power of 2 so a copy isn't needed.
- // We also know that we will not be using mipmaps. If things things weren't true we should
- // go through GrBitmapTextureMaker to handle needed copies.
- const sk_sp<SkImage> permutationsImage = paintingData->getImprovedPermutationsImage();
- SkASSERT(SkIsPow2(permutationsImage->width()) && SkIsPow2(permutationsImage->height()));
- sk_sp<GrTextureProxy> permutationsTexture(
- GrMakeCachedImageProxy(proxyProvider, std::move(permutationsImage)));
- const sk_sp<SkImage> gradientImage = paintingData->getGradientImage();
- SkASSERT(SkIsPow2(gradientImage->width()) && SkIsPow2(gradientImage->height()));
- sk_sp<GrTextureProxy> gradientTexture(
- GrMakeCachedImageProxy(proxyProvider, std::move(gradientImage)));
- return GrImprovedPerlinNoiseEffect::Make(fNumOctaves, fSeed, std::move(paintingData),
- std::move(permutationsTexture),
- std::move(gradientTexture), m);
- }
- if (0 == fNumOctaves) {
- if (kFractalNoise_Type == fType) {
- // Extract the incoming alpha and emit rgba = (a/4, a/4, a/4, a/2)
- // TODO: Either treat the output of this shader as sRGB or allow client to specify a
- // color space of the noise. Either way, this case (and the GLSL) need to convert to
- // the destination.
- auto inner =
- GrConstColorProcessor::Make(SkPMColor4f::FromBytes_RGBA(0x80404040),
- GrConstColorProcessor::InputMode::kModulateRGBA);
- return GrFragmentProcessor::MulChildByInputAlpha(std::move(inner));
- }
- // Emit zero.
- return GrConstColorProcessor::Make(SK_PMColor4fTRANSPARENT,
- GrConstColorProcessor::InputMode::kIgnore);
- }
- // Need to assert that the textures we'll create are power of 2 so that now copy is needed. We
- // also know that we will not be using mipmaps. If things things weren't true we should go
- // through GrBitmapTextureMaker to handle needed copies.
- const sk_sp<SkImage> permutationsImage = paintingData->getPermutationsImage();
- SkASSERT(SkIsPow2(permutationsImage->width()) && SkIsPow2(permutationsImage->height()));
- sk_sp<GrTextureProxy> permutationsProxy = GrMakeCachedImageProxy(proxyProvider,
- std::move(permutationsImage));
- const sk_sp<SkImage> noiseImage = paintingData->getNoiseImage();
- SkASSERT(SkIsPow2(noiseImage->width()) && SkIsPow2(noiseImage->height()));
- sk_sp<GrTextureProxy> noiseProxy = GrMakeCachedImageProxy(proxyProvider,
- std::move(noiseImage));
- if (permutationsProxy && noiseProxy) {
- auto inner = GrPerlinNoise2Effect::Make(fType,
- fNumOctaves,
- fStitchTiles,
- std::move(paintingData),
- std::move(permutationsProxy),
- std::move(noiseProxy),
- m);
- return GrFragmentProcessor::MulChildByInputAlpha(std::move(inner));
- }
- return nullptr;
- }
- #endif
- ///////////////////////////////////////////////////////////////////////////////////////////////////
- static bool valid_input(SkScalar baseX, SkScalar baseY, int numOctaves, const SkISize* tileSize,
- SkScalar seed) {
- if (!(baseX >= 0 && baseY >= 0)) {
- return false;
- }
- if (!(numOctaves >= 0 && numOctaves <= SkPerlinNoiseShaderImpl::kMaxOctaves)) {
- return false;
- }
- if (tileSize && !(tileSize->width() >= 0 && tileSize->height() >= 0)) {
- return false;
- }
- if (!SkScalarIsFinite(seed)) {
- return false;
- }
- return true;
- }
- sk_sp<SkShader> SkPerlinNoiseShader::MakeFractalNoise(SkScalar baseFrequencyX,
- SkScalar baseFrequencyY,
- int numOctaves, SkScalar seed,
- const SkISize* tileSize) {
- if (!valid_input(baseFrequencyX, baseFrequencyY, numOctaves, tileSize, seed)) {
- return nullptr;
- }
- return sk_sp<SkShader>(new SkPerlinNoiseShaderImpl(SkPerlinNoiseShaderImpl::kFractalNoise_Type,
- baseFrequencyX, baseFrequencyY, numOctaves, seed,
- tileSize));
- }
- sk_sp<SkShader> SkPerlinNoiseShader::MakeTurbulence(SkScalar baseFrequencyX,
- SkScalar baseFrequencyY,
- int numOctaves, SkScalar seed,
- const SkISize* tileSize) {
- if (!valid_input(baseFrequencyX, baseFrequencyY, numOctaves, tileSize, seed)) {
- return nullptr;
- }
- return sk_sp<SkShader>(new SkPerlinNoiseShaderImpl(SkPerlinNoiseShaderImpl::kTurbulence_Type,
- baseFrequencyX, baseFrequencyY, numOctaves, seed,
- tileSize));
- }
- sk_sp<SkShader> SkPerlinNoiseShader::MakeImprovedNoise(SkScalar baseFrequencyX,
- SkScalar baseFrequencyY,
- int numOctaves, SkScalar z) {
- if (!valid_input(baseFrequencyX, baseFrequencyY, numOctaves, nullptr, z)) {
- return nullptr;
- }
- return sk_sp<SkShader>(new SkPerlinNoiseShaderImpl(SkPerlinNoiseShaderImpl::kImprovedNoise_Type,
- baseFrequencyX, baseFrequencyY, numOctaves, z,
- nullptr));
- }
- void SkPerlinNoiseShader::RegisterFlattenables() {
- SK_REGISTER_FLATTENABLE(SkPerlinNoiseShaderImpl);
- }
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