diff options
author | Brian Salomon <bsalomon@google.com> | 2017-07-18 20:45:21 +0000 |
---|---|---|
committer | Skia Commit-Bot <skia-commit-bot@chromium.org> | 2017-07-18 20:45:35 +0000 |
commit | 0f01b2e8b5e3119e91886a2f7ec772a915d97a8c (patch) | |
tree | 2630a44a3f483cd1bb4333a65e1ebe7c005cb8c5 | |
parent | 312f4b24f96ff8c3f2bdb040b8167c09765992e4 (diff) |
Revert "Revert "Improvements to GPU dither.""
This reverts commit 38fb308f3156aab1e42a61d77d08906a06263879.
Reason for revert: Reland with SkSL caps fix for vulkan
Original change's description:
> Revert "Improvements to GPU dither."
>
> This reverts commit 1806e33e6a09b1361de4925d32389a01e0e2c7e7.
>
> Reason for revert: <INSERT REASONING HERE>
>
> Original change's description:
> > Improvements to GPU dither.
> >
> > 1) Makes the range of the offset dependent on the config.
> >
> > 2) Uses an ordered dither on GPUs that support integers in shaders.
> >
> > 3) Enables dithering for all paints with dither flag when the color type of the dst is 4444
> >
> > 4) Dithers r,g,b and clamps to 0,a rather than dithering all four channels (same as CPU backend).
> >
> > Bug: skia:
> > Change-Id: Ie22c3adc38c6d1dbbcd97e4b7d16fc843e392c2e
> > Reviewed-on: https://skia-review.googlesource.com/23485
> > Commit-Queue: Brian Salomon <bsalomon@google.com>
> > Reviewed-by: Robert Phillips <robertphillips@google.com>
>
> TBR=bsalomon@google.com,robertphillips@google.com
>
> Change-Id: Ie82e88bd9032bf8eee745d32d9b57c335a8997c9
> No-Presubmit: true
> No-Tree-Checks: true
> No-Try: true
> Bug: skia:
> Reviewed-on: https://skia-review.googlesource.com/24325
> Reviewed-by: Brian Salomon <bsalomon@google.com>
> Commit-Queue: Brian Salomon <bsalomon@google.com>
TBR=bsalomon@google.com,robertphillips@google.com
Change-Id: Ic38ac276c8b88b8d993a29d1fcbfe37e84becd2a
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:
Reviewed-on: https://skia-review.googlesource.com/24282
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
-rw-r--r-- | src/core/SkPaintPriv.cpp | 4 | ||||
-rw-r--r-- | src/gpu/SkGr.cpp | 5 | ||||
-rw-r--r-- | src/gpu/effects/GrDitherEffect.cpp | 7 | ||||
-rw-r--r-- | src/gpu/effects/GrDitherEffect.fp | 83 | ||||
-rw-r--r-- | src/gpu/effects/GrDitherEffect.h | 36 |
5 files changed, 113 insertions, 22 deletions
diff --git a/src/core/SkPaintPriv.cpp b/src/core/SkPaintPriv.cpp index dcd8dd6a5a..7d771f88a6 100644 --- a/src/core/SkPaintPriv.cpp +++ b/src/core/SkPaintPriv.cpp @@ -75,8 +75,8 @@ bool SkPaintPriv::ShouldDither(const SkPaint& p, SkColorType dstCT) { return false; } - // We always dither 565 when requested. - if (dstCT == SkColorType::kRGB_565_SkColorType) { + // We always dither 565 or 4444 when requested. + if (dstCT == kRGB_565_SkColorType || dstCT == kARGB_4444_SkColorType) { return true; } diff --git a/src/gpu/SkGr.cpp b/src/gpu/SkGr.cpp index b37a607052..6d8e46ddca 100644 --- a/src/gpu/SkGr.cpp +++ b/src/gpu/SkGr.cpp @@ -535,7 +535,10 @@ static inline bool skpaint_to_grpaint_impl(GrContext* context, GrPixelConfigToColorType(rtc->config(), &ct); if (SkPaintPriv::ShouldDither(skPaint, ct) && grPaint->numColorFragmentProcessors() > 0 && !rtc->isGammaCorrect()) { - grPaint->addColorFragmentProcessor(GrDitherEffect::Make()); + auto ditherFP = GrDitherEffect::Make(rtc->config()); + if (ditherFP) { + grPaint->addColorFragmentProcessor(std::move(ditherFP)); + } } #endif return true; diff --git a/src/gpu/effects/GrDitherEffect.cpp b/src/gpu/effects/GrDitherEffect.cpp index 052ed4e36d..753bbce185 100644 --- a/src/gpu/effects/GrDitherEffect.cpp +++ b/src/gpu/effects/GrDitherEffect.cpp @@ -23,7 +23,7 @@ public: GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder; const GrDitherEffect& _outer = args.fFp.cast<GrDitherEffect>(); (void) _outer; - fragBuilder->codeAppendf("float r = fract(sin(dot(sk_FragCoord.xy, vec2(12.989800000000001, 78.233000000000004))) * 43758.545299999998) - 0.5;\n%s = clamp(0.0039215686274509803 * vec4(r) + %s, 0.0, 1.0);\n", args.fOutputColor, args.fInputColor ? args.fInputColor : "vec4(1)"); + fragBuilder->codeAppendf("float value;\nfloat range;\n@switch (%d) {\n case 0:\n range = 0.0039215686274509803;\n break;\n case 1:\n range = 0.015873015873015872;\n break;\n default:\n range = 0.0083333333333333332;\n break;\n}\n@if (sk_Caps.integerSupport) {\n int x = int(sk_FragCoord.x);\n int y = int(sk_FragCoord.y);\n uint m = uint((((((y & 1) << 5 | (x & 1) << 4) | (y & 2) << 2) | (x & 2) << 1) | (y & 4) >> 1) | (x & 4) >> 2);\n value = float(m) / 64.0 - 0.4921875;\n} else {\n value = fract(sin(dot(sk_FragCoord.xy, vec2(12.989800000000001, 78.233000000000004))) * 43758.545299999998) - 0.5;\n}\n%s = vec4(clamp(%s.xyz + value * range, 0.0, %s.w), %s.w);\n", _outer.rangeType(), args.fOutputColor, args.fInputColor ? args.fInputColor : "vec4(1)", args.fInputColor ? args.fInputColor : "vec4(1)", args.fInputColor ? args.fInputColor : "vec4(1)"); } private: void onSetData(const GrGLSLProgramDataManager& pdman, const GrFragmentProcessor& _proc) override { @@ -33,17 +33,20 @@ GrGLSLFragmentProcessor* GrDitherEffect::onCreateGLSLInstance() const { return new GrGLSLDitherEffect(); } void GrDitherEffect::onGetGLSLProcessorKey(const GrShaderCaps& caps, GrProcessorKeyBuilder* b) const { + b->add32(fRangeType); } bool GrDitherEffect::onIsEqual(const GrFragmentProcessor& other) const { const GrDitherEffect& that = other.cast<GrDitherEffect>(); (void) that; + if (fRangeType != that.fRangeType) return false; return true; } GR_DEFINE_FRAGMENT_PROCESSOR_TEST(GrDitherEffect); #if GR_TEST_UTILS sk_sp<GrFragmentProcessor> GrDitherEffect::TestCreate(GrProcessorTestData* testData) { - return GrDitherEffect::Make(); + float range = testData->fRandom->nextRangeF(0.001f, 0.05f); + return sk_sp<GrFragmentProcessor>(new GrDitherEffect(range)); } #endif #endif diff --git a/src/gpu/effects/GrDitherEffect.fp b/src/gpu/effects/GrDitherEffect.fp index 1c35b38cd2..937efae264 100644 --- a/src/gpu/effects/GrDitherEffect.fp +++ b/src/gpu/effects/GrDitherEffect.fp @@ -1,17 +1,74 @@ -void main() { - // Generate a random number based on the fragment position. For this - // random number generator, we use the "GLSL rand" function - // that seems to be floating around on the internet. It works under - // the assumption that sin(<big number>) oscillates with high frequency - // and sampling it will generate "randomness". Since we're using this - // for rendering and not cryptography it should be OK. +// This controls the range of values added to color channels +layout(key) in int rangeType; - // For each channel c, add the random offset to the pixel to either bump - // it up or let it remain constant during quantization. - float r = fract(sin(dot(sk_FragCoord.xy, vec2(12.9898, 78.233))) * 43758.5453) - .5; - sk_OutColor = clamp(1 / 255.0 * vec4(r) + sk_InColor, 0, 1); +@make { + static sk_sp<GrFragmentProcessor> Make(GrPixelConfig dstConfig) { + int rangeType; + switch (dstConfig) { + case kGray_8_GrPixelConfig: + case kRGBA_8888_GrPixelConfig: + case kBGRA_8888_GrPixelConfig: + case kSRGBA_8888_GrPixelConfig: + case kSBGRA_8888_GrPixelConfig: + rangeType = 0; + break; + case kRGB_565_GrPixelConfig: + rangeType = 1; + break; + case kRGBA_4444_GrPixelConfig: + rangeType = 2; + break; + case kUnknown_GrPixelConfig: + case kAlpha_half_GrPixelConfig: + case kRGBA_8888_sint_GrPixelConfig: + case kRGBA_float_GrPixelConfig: + case kRG_float_GrPixelConfig: + case kRGBA_half_GrPixelConfig: + case kAlpha_8_GrPixelConfig: + return nullptr; + } + return sk_sp<GrFragmentProcessor>(new GrDitherEffect(rangeType)); + } +} + +void main() { + float value; + float range; + @switch (rangeType) { + case 0: + range = 1.0 / 255.0; + break; + case 1: + range = 1.0 / 63.0; + break; + default: + // Experimentally this looks better than the expected value of 1/15. + range = 0.125 / 15.0; + break; + } + @if (sk_Caps.integerSupport) { + // This ordered-dither code is lifted from the cpu backend. + int x = int(sk_FragCoord.x); + int y = int(sk_FragCoord.y); + uint m = (y & 1) << 5 | (x & 1) << 4 | + (y & 2) << 2 | (x & 2) << 1 | + (y & 4) >> 1 | (x & 4) >> 2; + value = float(m) * 1.0 / 64.0 - 63.0 / 128.0; + } else { + // Generate a random number based on the fragment position. For this + // random number generator, we use the "GLSL rand" function + // that seems to be floating around on the internet. It works under + // the assumption that sin(<big number>) oscillates with high frequency + // and sampling it will generate "randomness". Since we're using this + // for rendering and not cryptography it should be OK. + value = fract(sin(dot(sk_FragCoord.xy, vec2(12.9898, 78.233))) * 43758.5453) - .5; + } + // For each color channel, add the random offset to the channel value and then clamp + // between 0 and alpha to keep the color premultiplied. + sk_OutColor = vec4(clamp(sk_InColor.rgb + value * range, 0, sk_InColor.a), sk_InColor.a); } @test(testData) { - return GrDitherEffect::Make(); -}
\ No newline at end of file + float range = testData->fRandom->nextRangeF(0.001f, 0.05f); + return sk_sp<GrFragmentProcessor>(new GrDitherEffect(range)); +} diff --git a/src/gpu/effects/GrDitherEffect.h b/src/gpu/effects/GrDitherEffect.h index a996ad94c2..63c0df7eb2 100644 --- a/src/gpu/effects/GrDitherEffect.h +++ b/src/gpu/effects/GrDitherEffect.h @@ -18,19 +18,47 @@ #include "effects/GrProxyMove.h" class GrDitherEffect : public GrFragmentProcessor { public: - static sk_sp<GrFragmentProcessor> Make() { - return sk_sp<GrFragmentProcessor>(new GrDitherEffect()); + int rangeType() const { return fRangeType; } + + static sk_sp<GrFragmentProcessor> Make(GrPixelConfig dstConfig) { + int rangeType; + switch (dstConfig) { + case kGray_8_GrPixelConfig: + case kRGBA_8888_GrPixelConfig: + case kBGRA_8888_GrPixelConfig: + case kSRGBA_8888_GrPixelConfig: + case kSBGRA_8888_GrPixelConfig: + rangeType = 0; + break; + case kRGB_565_GrPixelConfig: + rangeType = 1; + break; + case kRGBA_4444_GrPixelConfig: + rangeType = 2; + break; + case kUnknown_GrPixelConfig: + case kAlpha_half_GrPixelConfig: + case kRGBA_8888_sint_GrPixelConfig: + case kRGBA_float_GrPixelConfig: + case kRG_float_GrPixelConfig: + case kRGBA_half_GrPixelConfig: + case kAlpha_8_GrPixelConfig: + return nullptr; + } + return sk_sp<GrFragmentProcessor>(new GrDitherEffect(rangeType)); } const char* name() const override { return "DitherEffect"; } private: - GrDitherEffect() - : INHERITED(kNone_OptimizationFlags) { + GrDitherEffect(int rangeType) + : INHERITED(kNone_OptimizationFlags) + , fRangeType(rangeType) { this->initClassID<GrDitherEffect>(); } GrGLSLFragmentProcessor* onCreateGLSLInstance() const override; void onGetGLSLProcessorKey(const GrShaderCaps&,GrProcessorKeyBuilder*) const override; bool onIsEqual(const GrFragmentProcessor&) const override; GR_DECLARE_FRAGMENT_PROCESSOR_TEST + int fRangeType; typedef GrFragmentProcessor INHERITED; }; #endif |