diff options
Diffstat (limited to 'src/gpu/effects/GrDitherEffect.fp')
-rw-r--r-- | src/gpu/effects/GrDitherEffect.fp | 85 |
1 files changed, 0 insertions, 85 deletions
diff --git a/src/gpu/effects/GrDitherEffect.fp b/src/gpu/effects/GrDitherEffect.fp deleted file mode 100644 index ed6c0e6b70..0000000000 --- a/src/gpu/effects/GrDitherEffect.fp +++ /dev/null @@ -1,85 +0,0 @@ -/* - * Copyright 2018 Google Inc. - * - * Use of this source code is governed by a BSD-style license that can be - * found in the LICENSE file. - */ - -// This controls the range of values added to color channels -layout(key) in int rangeType; - -@make { - static std::unique_ptr<GrFragmentProcessor> Make(GrPixelConfig dstConfig) { - int rangeType; - switch (dstConfig) { - case kGray_8_GrPixelConfig: - case kGray_8_as_Lum_GrPixelConfig: - case kGray_8_as_Red_GrPixelConfig: - case kRGBA_8888_GrPixelConfig: - case kRGB_888_GrPixelConfig: - case kBGRA_8888_GrPixelConfig: - rangeType = 0; - break; - case kRGB_565_GrPixelConfig: - rangeType = 1; - break; - case kRGBA_4444_GrPixelConfig: - rangeType = 2; - break; - case kUnknown_GrPixelConfig: - case kSRGBA_8888_GrPixelConfig: - case kSBGRA_8888_GrPixelConfig: - case kRGBA_1010102_GrPixelConfig: - case kAlpha_half_GrPixelConfig: - case kAlpha_half_as_Red_GrPixelConfig: - case kRGBA_float_GrPixelConfig: - case kRG_float_GrPixelConfig: - case kRGBA_half_GrPixelConfig: - case kAlpha_8_GrPixelConfig: - case kAlpha_8_as_Alpha_GrPixelConfig: - case kAlpha_8_as_Red_GrPixelConfig: - return nullptr; - } - return std::unique_ptr<GrFragmentProcessor>(new GrDitherEffect(rangeType)); - } -} - -void main() { - half value; - half 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 = 1.0 / 15.0; - break; - } - @if (sk_Caps.integerSupport) { - // This ordered-dither code is lifted from the cpu backend. - uint x = uint(sk_FragCoord.x); - uint y = uint(sk_FragCoord.y); - uint m = (y & 1) << 5 | (x & 1) << 4 | - (y & 2) << 2 | (x & 2) << 1 | - (y & 4) >> 1 | (x & 4) >> 2; - value = half(m) * 1.0 / 64.0 - 63.0 / 128.0; - } else { - // Simulate the integer effect used above using step/mod. For speed, simulates a 4x4 - // dither pattern rather than an 8x8 one. - half4 modValues = mod(sk_FragCoord.xyxy, half4(2.0, 2.0, 4.0, 4.0)); - half4 stepValues = step(modValues, half4(1.0, 1.0, 2.0, 2.0)); - value = dot(stepValues, half4(8.0 / 16.0, 4.0 / 16.0, 2.0 / 16.0, 1.0 / 16.0)) - 15.0 / 32.0; - } - // 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 = half4(clamp(sk_InColor.rgb + value * range, 0, sk_InColor.a), sk_InColor.a); -} - -@test(testData) { - float range = testData->fRandom->nextRangeF(0.001f, 0.05f); - return std::unique_ptr<GrFragmentProcessor>(new GrDitherEffect(range)); -} |