| /* |
| * 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/SkBitmap.h" |
| #include "include/core/SkColorFilter.h" |
| #include "include/core/SkShader.h" |
| #include "include/core/SkString.h" |
| #include "include/core/SkUnPreMultiply.h" |
| #include "include/private/SkTPin.h" |
| #include "src/core/SkArenaAlloc.h" |
| #include "src/core/SkMatrixProvider.h" |
| #include "src/core/SkReadBuffer.h" |
| #include "src/core/SkWriteBuffer.h" |
| |
| #if SK_SUPPORT_GPU |
| #include "include/gpu/GrRecordingContext.h" |
| #include "src/gpu/GrRecordingContextPriv.h" |
| #include "src/gpu/SkGr.h" |
| #include "src/gpu/effects/GrMatrixEffect.h" |
| #include "src/gpu/effects/GrTextureEffect.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(std::min(SkScalarRoundToInt(w), SK_MaxS32 - kPerlinNoise)) |
| , fWrapX(kPerlinNoise + fWidth) |
| , fHeight(std::min(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); |
| fPermutationsBitmap.installPixels(info, fLatticeSelector, info.minRowBytes()); |
| fPermutationsBitmap.setImmutable(); |
| |
| info = SkImageInfo::Make(kBlockSize, 4, kRGBA_8888_SkColorType, kPremul_SkAlphaType); |
| fNoiseBitmap.installPixels(info, fNoise[0][0], info.minRowBytes()); |
| fNoiseBitmap.setImmutable(); |
| |
| info = SkImageInfo::MakeA8(256, 1); |
| fImprovedPermutationsBitmap.installPixels(info, improved_noise_permutations, |
| info.minRowBytes()); |
| fImprovedPermutationsBitmap.setImmutable(); |
| |
| 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::Make(16, 1, kBGRA_8888_SkColorType, kPremul_SkAlphaType); |
| fGradientBitmap.installPixels(info, gradients, info.minRowBytes()); |
| fGradientBitmap.setImmutable(); |
| #endif |
| } |
| |
| #if SK_SUPPORT_GPU |
| PaintingData(const PaintingData& that) |
| : fSeed(that.fSeed) |
| , fTileSize(that.fTileSize) |
| , fBaseFrequency(that.fBaseFrequency) |
| , fStitchDataInit(that.fStitchDataInit) |
| , fPermutationsBitmap(that.fPermutationsBitmap) |
| , fNoiseBitmap(that.fNoiseBitmap) |
| , fImprovedPermutationsBitmap(that.fImprovedPermutationsBitmap) |
| , fGradientBitmap(that.fGradientBitmap) { |
| 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 |
| SkBitmap fPermutationsBitmap; |
| SkBitmap fNoiseBitmap; |
| SkBitmap fImprovedPermutationsBitmap; |
| SkBitmap fGradientBitmap; |
| #endif |
| |
| inline int random() { |
| // See https://www.w3.org/TR/SVG11/filters.html#feTurbulenceElement |
| // m = kRandMaximum, 2**31 - 1 (2147483647) |
| static constexpr int kRandAmplitude = 16807; // 7**5; primitive root of m |
| static constexpr int kRandQ = 127773; // m / a |
| static constexpr int kRandR = 2836; // m % a |
| |
| int result = kRandAmplitude * (fSeed % kRandQ) - kRandR * (fSeed / kRandQ); |
| if (result <= 0) { |
| result += kRandMaximum; |
| } |
| fSeed = result; |
| return result; |
| } |
| |
| // Only called once. Could be part of the constructor. |
| void init(SkScalar seed) |
| { |
| // 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 constexpr SkScalar kHalfMax16bits = 32767.5f; |
| |
| // Compute gradients from permutated noise data |
| static constexpr SkScalar kInvBlockSizef = 1.0 / SkIntToScalar(kBlockSize); |
| for (int channel = 0; channel < 4; ++channel) { |
| for (int i = 0; i < kBlockSize; ++i) { |
| fGradient[channel][i] = SkPoint::Make( |
| (fNoise[channel][i][0] - kBlockSize) * kInvBlockSizef, |
| (fNoise[channel][i][1] - kBlockSize) * kInvBlockSizef); |
| fGradient[channel][i].normalize(); |
| // Put the normalized gradient back into the noise data |
| fNoise[channel][i][0] = |
| SkScalarRoundToInt((fGradient[channel][i].fX + 1) * kHalfMax16bits); |
| fNoise[channel][i][1] = |
| SkScalarRoundToInt((fGradient[channel][i].fY + 1) * kHalfMax16bits); |
| } |
| } |
| } |
| |
| // 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 SkBitmap& getPermutationsBitmap() const { return fPermutationsBitmap; } |
| |
| const SkBitmap& getNoiseBitmap() const { return fNoiseBitmap; } |
| |
| const SkBitmap& getImprovedPermutationsBitmap() const { |
| return fImprovedPermutationsBitmap; |
| } |
| |
| const SkBitmap& getGradientBitmap() const { return fGradientBitmap; } |
| #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; |
| |
| using INHERITED = Context; |
| }; |
| |
| #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; |
| |
| using INHERITED = SkShaderBase; |
| }; |
| |
| 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 SkTPin(turbulenceFunctionResult, 0.0f, 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 = SkTPin((result + 1.0f) / 2.0f, 0.0f, 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; |
| |
| using INHERITED = GrGLSLFragmentProcessor; |
| }; |
| |
| ///////////////////////////////////////////////////////////////////// |
| |
| class GrPerlinNoise2Effect : public GrFragmentProcessor { |
| public: |
| static std::unique_ptr<GrFragmentProcessor> Make( |
| SkPerlinNoiseShaderImpl::Type type, |
| int numOctaves, |
| bool stitchTiles, |
| std::unique_ptr<SkPerlinNoiseShaderImpl::PaintingData> paintingData, |
| GrSurfaceProxyView permutationsView, |
| GrSurfaceProxyView noiseView, |
| const SkMatrix& matrix, |
| const GrCaps& caps) { |
| static constexpr GrSamplerState kRepeatXSampler = {GrSamplerState::WrapMode::kRepeat, |
| GrSamplerState::WrapMode::kClamp, |
| GrSamplerState::Filter::kNearest}; |
| auto permutationsFP = |
| GrTextureEffect::Make(std::move(permutationsView), kPremul_SkAlphaType, |
| SkMatrix::I(), kRepeatXSampler, caps); |
| auto noiseFP = GrTextureEffect::Make(std::move(noiseView), kPremul_SkAlphaType, |
| SkMatrix::I(), kRepeatXSampler, caps); |
| |
| return GrMatrixEffect::Make(matrix, std::unique_ptr<GrFragmentProcessor>( |
| new GrPerlinNoise2Effect(type, numOctaves, stitchTiles, std::move(paintingData), |
| std::move(permutationsFP), std::move(noiseFP)))); |
| } |
| |
| 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; } |
| |
| private: |
| GrGLSLFragmentProcessor* onCreateGLSLInstance() const override { |
| return new GrGLPerlinNoise; |
| } |
| |
| 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, |
| std::unique_ptr<GrFragmentProcessor> permutationsFP, |
| std::unique_ptr<GrFragmentProcessor> noiseFP) |
| : INHERITED(kGrPerlinNoise2Effect_ClassID, kNone_OptimizationFlags) |
| , fType(type) |
| , fNumOctaves(numOctaves) |
| , fStitchTiles(stitchTiles) |
| , fPaintingData(std::move(paintingData)) { |
| this->registerChild(std::move(permutationsFP), SkSL::SampleUsage::Explicit()); |
| this->registerChild(std::move(noiseFP), SkSL::SampleUsage::Explicit()); |
| this->setUsesSampleCoordsDirectly(); |
| } |
| |
| GrPerlinNoise2Effect(const GrPerlinNoise2Effect& that) |
| : INHERITED(kGrPerlinNoise2Effect_ClassID, kNone_OptimizationFlags) |
| , fType(that.fType) |
| , fNumOctaves(that.fNumOctaves) |
| , fStitchTiles(that.fStitchTiles) |
| , fPaintingData(new SkPerlinNoiseShaderImpl::PaintingData(*that.fPaintingData)) { |
| this->cloneAndRegisterAllChildProcessors(that); |
| this->setUsesSampleCoordsDirectly(); |
| } |
| |
| |
| GR_DECLARE_FRAGMENT_PROCESSOR_TEST |
| |
| SkPerlinNoiseShaderImpl::Type fType; |
| int fNumOctaves; |
| bool fStitchTiles; |
| |
| std::unique_ptr<SkPerlinNoiseShaderImpl::PaintingData> fPaintingData; |
| |
| using INHERITED = GrFragmentProcessor; |
| }; |
| |
| ///////////////////////////////////////////////////////////////////// |
| 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>(); |
| |
| GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder; |
| GrGLSLUniformHandler* uniformHandler = args.fUniformHandler; |
| |
| fBaseFrequencyUni = uniformHandler->addUniform(&pne, kFragment_GrShaderFlag, kHalf2_GrSLType, |
| "baseFrequency"); |
| const char* baseFrequencyUni = uniformHandler->getUniformCStr(fBaseFrequencyUni); |
| |
| const char* stitchDataUni = nullptr; |
| if (pne.stitchTiles()) { |
| fStitchDataUni = uniformHandler->addUniform(&pne, kFragment_GrShaderFlag, kHalf2_GrSLType, |
| "stitchData"); |
| stitchDataUni = uniformHandler->getUniformCStr(fStitchDataUni); |
| } |
| |
| // Add noise function |
| const GrShaderVar gPerlinNoiseArgs[] = {{"chanCoord", kHalf_GrSLType }, |
| {"noiseVec ", kHalf2_GrSLType}}; |
| |
| const GrShaderVar gPerlinNoiseStitchArgs[] = {{"chanCoord" , kHalf_GrSLType }, |
| {"noiseVec" , kHalf2_GrSLType}, |
| {"stitchData", kHalf2_GrSLType}}; |
| |
| SkString noiseCode; |
| |
| noiseCode.append( |
| R"(half4 floorVal; |
| floorVal.xy = floor(noiseVec); |
| floorVal.zw = floorVal.xy + half2(1); |
| half2 fractVal = fract(noiseVec); |
| // smooth curve : t^2*(3 - 2*t) |
| half2 noiseSmooth = fractVal*fractVal*(half2(3) - 2*fractVal);)"); |
| |
| // Adjust frequencies if we're stitching tiles |
| if (pne.stitchTiles()) { |
| noiseCode.append( |
| R"(if (floorVal.x >= stitchData.x) { floorVal.x -= stitchData.x; }; |
| if (floorVal.y >= stitchData.y) { floorVal.y -= stitchData.y; }; |
| if (floorVal.z >= stitchData.x) { floorVal.z -= stitchData.x; }; |
| if (floorVal.w >= stitchData.y) { floorVal.w -= stitchData.y; };)"); |
| } |
| |
| // NOTE: We need to explicitly pass half4(1) as input color here, because the helper function |
| // can't see fInputColor (which is "_input" in the FP's outer function). skbug.com/10506 |
| SkString sampleX = this->invokeChild(0, "half4(1)", args, "half2(floorVal.x, 0.5)"); |
| SkString sampleY = this->invokeChild(0, "half4(1)", args, "half2(floorVal.z, 0.5)"); |
| noiseCode.appendf("half2 latticeIdx = half2(%s.a, %s.a);", sampleX.c_str(), sampleY.c_str()); |
| |
| #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.append( |
| "latticeIdx = floor(latticeIdx * half2(255.0) + half2(0.5)) * half2(0.003921569);"); |
| #endif |
| |
| // Get (x,y) coordinates with the permutated x |
| noiseCode.append("half4 bcoords = 256*latticeIdx.xyxy + floorVal.yyww;"); |
| |
| noiseCode.append("half2 uv;"); |
| |
| // 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. |
| // Save it as a string because we will repeat it 4x. |
| static constexpr const char* inc8bit = "0.00390625"; // 1.0 / 256.0 |
| SkString dotLattice = |
| SkStringPrintf("dot((lattice.ga + lattice.rb*%s)*2 - half2(1), fractVal)", inc8bit); |
| |
| SkString sampleA = this->invokeChild(1, "half4(1)", args, "half2(bcoords.x, chanCoord)"); |
| SkString sampleB = this->invokeChild(1, "half4(1)", args, "half2(bcoords.y, chanCoord)"); |
| SkString sampleC = this->invokeChild(1, "half4(1)", args, "half2(bcoords.w, chanCoord)"); |
| SkString sampleD = this->invokeChild(1, "half4(1)", args, "half2(bcoords.z, chanCoord)"); |
| |
| // Compute u, at offset (0,0) |
| noiseCode.appendf("half4 lattice = %s;", sampleA.c_str()); |
| noiseCode.appendf("uv.x = %s;", dotLattice.c_str()); |
| |
| // Compute v, at offset (-1,0) |
| noiseCode.append("fractVal.x -= 1.0;"); |
| noiseCode.appendf("lattice = %s;", sampleB.c_str()); |
| noiseCode.appendf("uv.y = %s;", dotLattice.c_str()); |
| |
| // Compute 'a' as a linear interpolation of 'u' and 'v' |
| noiseCode.append("half2 ab;"); |
| noiseCode.append("ab.x = mix(uv.x, uv.y, noiseSmooth.x);"); |
| |
| // Compute v, at offset (-1,-1) |
| noiseCode.append("fractVal.y -= 1.0;"); |
| noiseCode.appendf("lattice = %s;", sampleC.c_str()); |
| noiseCode.appendf("uv.y = %s;", dotLattice.c_str()); |
| |
| // Compute u, at offset (0,-1) |
| noiseCode.append("fractVal.x += 1.0;"); |
| noiseCode.appendf("lattice = %s;", sampleD.c_str()); |
| noiseCode.appendf("uv.x = %s;", dotLattice.c_str()); |
| |
| // Compute 'b' as a linear interpolation of 'u' and 'v' |
| noiseCode.append("ab.y = mix(uv.x, uv.y, noiseSmooth.x);"); |
| // Compute the noise as a linear interpolation of 'a' and 'b' |
| noiseCode.append("return mix(ab.x, ab.y, noiseSmooth.y);"); |
| |
| SkString noiseFuncName = fragBuilder->getMangledFunctionName("noiseFuncName"); |
| if (pne.stitchTiles()) { |
| fragBuilder->emitFunction(kHalf_GrSLType, noiseFuncName.c_str(), |
| {gPerlinNoiseStitchArgs, SK_ARRAY_COUNT(gPerlinNoiseStitchArgs)}, |
| noiseCode.c_str()); |
| } else { |
| fragBuilder->emitFunction(kHalf_GrSLType, noiseFuncName.c_str(), |
| {gPerlinNoiseArgs, SK_ARRAY_COUNT(gPerlinNoiseArgs)}, |
| noiseCode.c_str()); |
| } |
| |
| // There are rounding errors if the floor operation is not performed here |
| fragBuilder->codeAppendf("half2 noiseVec = half2(floor(%s.xy) * %s);", |
| args.fSampleCoord, baseFrequencyUni); |
| |
| // Clear the color accumulator |
| fragBuilder->codeAppendf("half4 color = half4(0);"); |
| |
| if (pne.stitchTiles()) { |
| // Set up TurbulenceInitial stitch values. |
| fragBuilder->codeAppendf("half2 stitchData = %s;", stitchDataUni); |
| } |
| |
| fragBuilder->codeAppendf("half ratio = 1.0;"); |
| |
| // Loop over all octaves |
| fragBuilder->codeAppendf("for (int octave = 0; octave < %d; ++octave) {", pne.numOctaves()); |
| fragBuilder->codeAppendf(" color += "); |
| if (pne.type() != SkPerlinNoiseShaderImpl::kFractalNoise_Type) { |
| fragBuilder->codeAppend("abs("); |
| } |
| |
| // There are 4 lines, put y coords at center of each. |
| static constexpr const char* chanCoordR = "0.5"; |
| static constexpr const char* chanCoordG = "1.5"; |
| static constexpr const char* chanCoordB = "2.5"; |
| static constexpr const char* chanCoordA = "3.5"; |
| if (pne.stitchTiles()) { |
| fragBuilder->codeAppendf(R"( |
| half4(%s(%s, noiseVec, stitchData), %s(%s, noiseVec, stitchData)," |
| %s(%s, noiseVec, stitchData), %s(%s, noiseVec, stitchData)))", |
| noiseFuncName.c_str(), chanCoordR, |
| noiseFuncName.c_str(), chanCoordG, |
| noiseFuncName.c_str(), chanCoordB, |
| noiseFuncName.c_str(), chanCoordA); |
| } else { |
| fragBuilder->codeAppendf(R"( |
| half4(%s(%s, noiseVec), %s(%s, noiseVec), |
| %s(%s, noiseVec), %s(%s, noiseVec)))", |
| noiseFuncName.c_str(), chanCoordR, |
| noiseFuncName.c_str(), chanCoordG, |
| noiseFuncName.c_str(), chanCoordB, |
| noiseFuncName.c_str(), chanCoordA); |
| } |
| if (pne.type() != SkPerlinNoiseShaderImpl::kFractalNoise_Type) { |
| fragBuilder->codeAppend(")"); // end of "abs(" |
| } |
| fragBuilder->codeAppend(" * ratio;"); |
| |
| fragBuilder->codeAppend(R"(noiseVec *= half2(2.0); |
| ratio *= 0.5;)"); |
| |
| if (pne.stitchTiles()) { |
| fragBuilder->codeAppend("stitchData *= half2(2.0);"); |
| } |
| fragBuilder->codeAppend("}"); // 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("color = color * half4(0.5) + half4(0.5);"); |
| } |
| |
| // Clamp values |
| fragBuilder->codeAppendf("color = saturate(color);"); |
| |
| // Pre-multiply the result |
| fragBuilder->codeAppendf("return half4(color.rgb * color.aaa, color.a);"); |
| } |
| |
| 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; |
| |
| using INHERITED = GrGLSLFragmentProcessor; |
| }; |
| |
| ///////////////////////////////////////////////////////////////////// |
| |
| class GrImprovedPerlinNoiseEffect : public GrFragmentProcessor { |
| public: |
| static std::unique_ptr<GrFragmentProcessor> Make( |
| int octaves, |
| SkScalar z, |
| std::unique_ptr<SkPerlinNoiseShaderImpl::PaintingData> paintingData, |
| GrSurfaceProxyView permutationsView, |
| GrSurfaceProxyView gradientView, |
| const SkMatrix& matrix, |
| const GrCaps& caps) { |
| static constexpr GrSamplerState kRepeatXSampler = {GrSamplerState::WrapMode::kRepeat, |
| GrSamplerState::WrapMode::kClamp, |
| GrSamplerState::Filter::kNearest}; |
| auto permutationsFP = |
| GrTextureEffect::Make(std::move(permutationsView), kPremul_SkAlphaType, |
| SkMatrix::I(), kRepeatXSampler, caps); |
| auto gradientFP = GrTextureEffect::Make(std::move(gradientView), kPremul_SkAlphaType, |
| SkMatrix::I(), kRepeatXSampler, caps); |
| return GrMatrixEffect::Make(matrix, std::unique_ptr<GrFragmentProcessor>( |
| new GrImprovedPerlinNoiseEffect(octaves, z, std::move(paintingData), |
| std::move(permutationsFP), |
| std::move(gradientFP)))); |
| } |
| |
| 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; } |
| |
| 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& that = sBase.cast<GrImprovedPerlinNoiseEffect>(); |
| return this->z() == that.z() && |
| this->octaves() == that.octaves() && |
| this->baseFrequency() == that.baseFrequency(); |
| } |
| |
| GrImprovedPerlinNoiseEffect(int octaves, |
| SkScalar z, |
| std::unique_ptr<SkPerlinNoiseShaderImpl::PaintingData> paintingData, |
| std::unique_ptr<GrFragmentProcessor> permutationsFP, |
| std::unique_ptr<GrFragmentProcessor> gradientFP) |
| : INHERITED(kGrImprovedPerlinNoiseEffect_ClassID, kNone_OptimizationFlags) |
| , fOctaves(octaves) |
| , fZ(z) |
| , fPaintingData(std::move(paintingData)) { |
| this->registerChild(std::move(permutationsFP), SkSL::SampleUsage::Explicit()); |
| this->registerChild(std::move(gradientFP), SkSL::SampleUsage::Explicit()); |
| this->setUsesSampleCoordsDirectly(); |
| } |
| |
| GrImprovedPerlinNoiseEffect(const GrImprovedPerlinNoiseEffect& that) |
| : INHERITED(kGrImprovedPerlinNoiseEffect_ClassID, kNone_OptimizationFlags) |
| , fOctaves(that.fOctaves) |
| , fZ(that.fZ) |
| , fPaintingData(std::make_unique<SkPerlinNoiseShaderImpl::PaintingData>( |
| *that.fPaintingData)) { |
| this->cloneAndRegisterAllChildProcessors(that); |
| this->setUsesSampleCoordsDirectly(); |
| } |
| |
| GR_DECLARE_FRAGMENT_PROCESSOR_TEST |
| |
| int fOctaves; |
| SkScalar fZ; |
| |
| std::unique_ptr<SkPerlinNoiseShaderImpl::PaintingData> fPaintingData; |
| |
| using INHERITED = GrFragmentProcessor; |
| }; |
| |
| ///////////////////////////////////////////////////////////////////// |
| 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>(); |
| GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder; |
| GrGLSLUniformHandler* uniformHandler = args.fUniformHandler; |
| |
| fBaseFrequencyUni = uniformHandler->addUniform(&pne, kFragment_GrShaderFlag, kHalf2_GrSLType, |
| "baseFrequency"); |
| const char* baseFrequencyUni = uniformHandler->getUniformCStr(fBaseFrequencyUni); |
| |
| fZUni = uniformHandler->addUniform(&pne, kFragment_GrShaderFlag, kHalf_GrSLType, "z"); |
| const char* zUni = uniformHandler->getUniformCStr(fZUni); |
| |
| // fade function |
| const GrShaderVar fadeArgs[] = { |
| GrShaderVar("t", kHalf3_GrSLType) |
| }; |
| SkString fadeFuncName = fragBuilder->getMangledFunctionName("fade"); |
| fragBuilder->emitFunction(kHalf3_GrSLType, fadeFuncName.c_str(), |
| {fadeArgs, SK_ARRAY_COUNT(fadeArgs)}, |
| "return t * t * t * (t * (t * 6.0 - 15.0) + 10.0);"); |
| |
| // perm function |
| const GrShaderVar permArgs[] = { |
| {"x", kHalf_GrSLType} |
| }; |
| SkString samplePerm = this->invokeChild(0, "half4(1)", args, "float2(x, 0.5)"); |
| SkString permFuncName = fragBuilder->getMangledFunctionName("perm"); |
| SkString permCode = SkStringPrintf("return %s.r * 255;", samplePerm.c_str()); |
| fragBuilder->emitFunction(kHalf_GrSLType, permFuncName.c_str(), |
| {permArgs, SK_ARRAY_COUNT(permArgs)}, permCode.c_str()); |
| |
| // grad function |
| const GrShaderVar gradArgs[] = { |
| {"x", kHalf_GrSLType}, |
| {"p", kHalf3_GrSLType} |
| }; |
| SkString sampleGrad = this->invokeChild(1, "half4(1)", args, "float2(x, 0.5)"); |
| SkString gradFuncName = fragBuilder->getMangledFunctionName("grad"); |
| SkString gradCode = SkStringPrintf("return half(dot(%s.rgb * 255.0 - float3(1.0), p));", |
| sampleGrad.c_str()); |
| fragBuilder->emitFunction(kHalf_GrSLType, gradFuncName.c_str(), |
| {gradArgs, SK_ARRAY_COUNT(gradArgs)}, gradCode.c_str()); |
| |
| // lerp function |
| const GrShaderVar lerpArgs[] = { |
| {"a", kHalf_GrSLType}, |
| {"b", kHalf_GrSLType}, |
| {"w", kHalf_GrSLType} |
| }; |
| SkString lerpFuncName = fragBuilder->getMangledFunctionName("lerp"); |
| fragBuilder->emitFunction(kHalf_GrSLType, lerpFuncName.c_str(), |
| {lerpArgs, SK_ARRAY_COUNT(lerpArgs)}, "return a + w * (b - a);"); |
| |
| // noise function |
| const GrShaderVar noiseArgs[] = { |
| {"p", kHalf3_GrSLType}, |
| }; |
| SkString noiseFuncName = fragBuilder->getMangledFunctionName("noise"); |
| 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, noiseFuncName.c_str(), |
| {noiseArgs, SK_ARRAY_COUNT(noiseArgs)}, noiseCode.c_str()); |
| |
| // noiseOctaves function |
| const GrShaderVar noiseOctavesArgs[] = { |
| {"p", kHalf3_GrSLType} |
| }; |
| SkString noiseOctavesFuncName = fragBuilder->getMangledFunctionName("noiseOctaves"); |
| 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, noiseOctavesFuncName.c_str(), |
| {noiseOctavesArgs, SK_ARRAY_COUNT(noiseOctavesArgs)}, |
| noiseOctavesCode.c_str()); |
| |
| fragBuilder->codeAppendf("half2 coords = half2(%s * %s);", args.fSampleCoord, 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); |
| |
| // Clamp values |
| fragBuilder->codeAppendf("half4 color = saturate(half4(r, g, b, a));"); |
| |
| // Pre-multiply the result |
| fragBuilder->codeAppendf("return half4(color.rgb * color.aaa, color.a);"); |
| } |
| |
| 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); |
| const auto paintMatrix = SkMatrix::Concat(args.fMatrixProvider.localToDevice(), *localMatrix); |
| |
| // Either we don't stitch tiles, either we have a valid tile size |
| SkASSERT(!fStitchTiles || !fTileSize.isEmpty()); |
| |
| std::unique_ptr<SkPerlinNoiseShaderImpl::PaintingData> paintingData = |
| std::make_unique<SkPerlinNoiseShaderImpl::PaintingData>(fTileSize, |
| fSeed, |
| fBaseFrequencyX, |
| fBaseFrequencyY, |
| paintMatrix); |
| |
| SkMatrix m = args.fMatrixProvider.localToDevice(); |
| m.setTranslateX(-localMatrix->getTranslateX() + SK_Scalar1); |
| m.setTranslateY(-localMatrix->getTranslateY() + SK_Scalar1); |
| |
| auto context = args.fContext; |
| 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 SkBitmap& permutationsBitmap = paintingData->getImprovedPermutationsBitmap(); |
| SkASSERT(SkIsPow2(permutationsBitmap.width()) && SkIsPow2(permutationsBitmap.height())); |
| auto permutationsView = GrMakeCachedBitmapProxyView(context, permutationsBitmap); |
| |
| const SkBitmap& gradientBitmap = paintingData->getGradientBitmap(); |
| SkASSERT(SkIsPow2(gradientBitmap.width()) && SkIsPow2(gradientBitmap.height())); |
| auto gradientView = GrMakeCachedBitmapProxyView(context, gradientBitmap); |
| return GrImprovedPerlinNoiseEffect::Make(fNumOctaves, |
| fSeed, |
| std::move(paintingData), |
| std::move(permutationsView), |
| std::move(gradientView), |
| m, |
| *context->priv().caps()); |
| } |
| |
| 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 = GrFragmentProcessor::ModulateRGBA( |
| /*child=*/nullptr, SkPMColor4f::FromBytes_RGBA(0x80404040)); |
| return GrFragmentProcessor::MulChildByInputAlpha(std::move(inner)); |
| } |
| // Emit zero. |
| return GrConstColorProcessor::Make(SK_PMColor4fTRANSPARENT); |
| } |
| |
| // 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 SkBitmap& permutationsBitmap = paintingData->getPermutationsBitmap(); |
| SkASSERT(SkIsPow2(permutationsBitmap.width()) && SkIsPow2(permutationsBitmap.height())); |
| auto permutationsView = GrMakeCachedBitmapProxyView(context, permutationsBitmap); |
| |
| const SkBitmap& noiseBitmap = paintingData->getNoiseBitmap(); |
| SkASSERT(SkIsPow2(noiseBitmap.width()) && SkIsPow2(noiseBitmap.height())); |
| auto noiseView = GrMakeCachedBitmapProxyView(context, noiseBitmap); |
| |
| if (permutationsView.proxy() && noiseView.proxy()) { |
| auto inner = GrPerlinNoise2Effect::Make(fType, |
| fNumOctaves, |
| fStitchTiles, |
| std::move(paintingData), |
| std::move(permutationsView), |
| std::move(noiseView), |
| m, |
| *context->priv().caps()); |
| 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); |
| } |