| /* |
| * Copyright 2011 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| #include "src/gpu/ganesh/GrStencilSettings.h" |
| |
| #include "include/private/base/SkDebug.h" |
| #include "src/gpu/KeyBuilder.h" |
| |
| #include <algorithm> |
| #include <cstddef> |
| #include <cstring> |
| |
| constexpr const GrUserStencilSettings gUnused( |
| GrUserStencilSettings::StaticInit< |
| 0x0000, |
| GrUserStencilTest::kAlwaysIfInClip, |
| 0xffff, |
| GrUserStencilOp::kKeep, |
| GrUserStencilOp::kKeep, |
| 0x0000>() |
| ); |
| |
| static_assert(kAll_StencilFlags == (gUnused.fCWFlags[0] & gUnused.fCCWFlags[0])); |
| |
| const GrUserStencilSettings& GrUserStencilSettings::kUnused = gUnused; |
| |
| void GrStencilSettings::reset(const GrUserStencilSettings& user, bool hasStencilClip, |
| int numStencilBits) { |
| uint16_t cwFlags = user.fCWFlags[hasStencilClip]; |
| if (cwFlags & kSingleSided_StencilFlag) { |
| SkASSERT(cwFlags == user.fCCWFlags[hasStencilClip]); |
| fFlags = cwFlags; |
| if (!this->isDisabled()) { |
| fCWFace.reset(user.fCWFace, hasStencilClip, numStencilBits); |
| } |
| return; |
| } |
| |
| uint16_t ccwFlags = user.fCCWFlags[hasStencilClip]; |
| fFlags = cwFlags & ccwFlags; |
| if (this->isDisabled()) { |
| return; |
| } |
| if (!(cwFlags & kDisabled_StencilFlag)) { |
| fCWFace.reset(user.fCWFace, hasStencilClip, numStencilBits); |
| } else { |
| fCWFace.setDisabled(); |
| } |
| if (!(ccwFlags & kDisabled_StencilFlag)) { |
| fCCWFace.reset(user.fCCWFace, hasStencilClip, numStencilBits); |
| } else { |
| fCCWFace.setDisabled(); |
| } |
| } |
| |
| void GrStencilSettings::reset(const GrStencilSettings& that) { |
| fFlags = that.fFlags; |
| if ((kInvalid_PrivateFlag | kDisabled_StencilFlag) & fFlags) { |
| return; |
| } |
| if (!this->isTwoSided()) { |
| memcpy(&fCWFace, &that.fCWFace, sizeof(Face)); |
| } else { |
| memcpy(&fCWFace, &that.fCWFace, 2 * sizeof(Face)); |
| static_assert(sizeof(Face) == |
| offsetof(GrStencilSettings, fCCWFace) - offsetof(GrStencilSettings, fCWFace)); |
| } |
| } |
| |
| bool GrStencilSettings::operator==(const GrStencilSettings& that) const { |
| if ((kInvalid_PrivateFlag | kDisabled_StencilFlag) & (fFlags | that.fFlags)) { |
| // At least one is invalid and/or disabled. |
| if (kInvalid_PrivateFlag & (fFlags | that.fFlags)) { |
| return false; // We never allow invalid stencils to be equal. |
| } |
| // They're only equal if both are disabled. |
| return kDisabled_StencilFlag & (fFlags & that.fFlags); |
| } |
| if (kSingleSided_StencilFlag & (fFlags & that.fFlags)) { |
| return 0 == memcmp(&fCWFace, &that.fCWFace, sizeof(Face)); // Both are single sided. |
| } else if (kSingleSided_StencilFlag & (fFlags | that.fFlags)) { |
| return false; |
| } else { |
| return 0 == memcmp(&fCWFace, &that.fCWFace, 2 * sizeof(Face)); |
| static_assert(sizeof(Face) == |
| offsetof(GrStencilSettings, fCCWFace) - offsetof(GrStencilSettings, fCWFace)); |
| } |
| // memcmp relies on GrStencilSettings::Face being tightly packed. |
| static_assert(0 == offsetof(Face, fRef)); |
| static_assert(2 == sizeof(Face::fRef)); |
| static_assert(2 == offsetof(Face, fTest)); |
| static_assert(2 == sizeof(Face::fTest)); |
| static_assert(4 == offsetof(Face, fTestMask)); |
| static_assert(2 == sizeof(Face::fTestMask)); |
| static_assert(6 == offsetof(Face, fPassOp)); |
| static_assert(1 == sizeof(Face::fPassOp)); |
| static_assert(7 == offsetof(Face, fFailOp)); |
| static_assert(1 == sizeof(Face::fFailOp)); |
| static_assert(8 == offsetof(Face, fWriteMask)); |
| static_assert(2 == sizeof(Face::fWriteMask)); |
| static_assert(10 == sizeof(Face)); |
| } |
| |
| static constexpr GrStencilTest gUserStencilTestToRaw[kGrUserStencilTestCount] = { |
| // Tests that respect the clip. |
| GrStencilTest::kAlways, // kAlwaysIfInClip (This is only for when there is not a stencil clip). |
| GrStencilTest::kEqual, // kEqualIfInClip. |
| GrStencilTest::kLess, // kLessIfInClip. |
| GrStencilTest::kLEqual, // kLEqualIfInClip. |
| |
| // Tests that ignore the clip. |
| GrStencilTest::kAlways, |
| GrStencilTest::kNever, |
| GrStencilTest::kGreater, |
| GrStencilTest::kGEqual, |
| GrStencilTest::kLess, |
| GrStencilTest::kLEqual, |
| GrStencilTest::kEqual, |
| GrStencilTest::kNotEqual |
| }; |
| |
| static_assert(0 == (int)GrUserStencilTest::kAlwaysIfInClip); |
| static_assert(1 == (int)GrUserStencilTest::kEqualIfInClip); |
| static_assert(2 == (int)GrUserStencilTest::kLessIfInClip); |
| static_assert(3 == (int)GrUserStencilTest::kLEqualIfInClip); |
| static_assert(4 == (int)GrUserStencilTest::kAlways); |
| static_assert(5 == (int)GrUserStencilTest::kNever); |
| static_assert(6 == (int)GrUserStencilTest::kGreater); |
| static_assert(7 == (int)GrUserStencilTest::kGEqual); |
| static_assert(8 == (int)GrUserStencilTest::kLess); |
| static_assert(9 == (int)GrUserStencilTest::kLEqual); |
| static_assert(10 == (int)GrUserStencilTest::kEqual); |
| static_assert(11 == (int)GrUserStencilTest::kNotEqual); |
| |
| static constexpr GrStencilOp gUserStencilOpToRaw[kGrUserStencilOpCount] = { |
| GrStencilOp::kKeep, |
| |
| // Ops that only modify user bits. |
| GrStencilOp::kZero, |
| GrStencilOp::kReplace, |
| GrStencilOp::kInvert, |
| GrStencilOp::kIncWrap, |
| GrStencilOp::kDecWrap, |
| GrStencilOp::kIncClamp, // kIncMaybeClamp. |
| GrStencilOp::kDecClamp, // kDecMaybeClamp. |
| |
| // Ops that only modify the clip bit. |
| GrStencilOp::kZero, // kZeroClipBit. |
| GrStencilOp::kReplace, // kSetClipBit. |
| GrStencilOp::kInvert, // kInvertClipBit. |
| |
| // Ops that modify clip and user bits. |
| GrStencilOp::kReplace, // kSetClipAndReplaceUserBits. |
| GrStencilOp::kZero // kZeroClipAndUserBits. |
| }; |
| |
| static_assert(0 == (int)GrUserStencilOp::kKeep); |
| static_assert(1 == (int)GrUserStencilOp::kZero); |
| static_assert(2 == (int)GrUserStencilOp::kReplace); |
| static_assert(3 == (int)GrUserStencilOp::kInvert); |
| static_assert(4 == (int)GrUserStencilOp::kIncWrap); |
| static_assert(5 == (int)GrUserStencilOp::kDecWrap); |
| static_assert(6 == (int)GrUserStencilOp::kIncMaybeClamp); |
| static_assert(7 == (int)GrUserStencilOp::kDecMaybeClamp); |
| static_assert(8 == (int)GrUserStencilOp::kZeroClipBit); |
| static_assert(9 == (int)GrUserStencilOp::kSetClipBit); |
| static_assert(10 == (int)GrUserStencilOp::kInvertClipBit); |
| static_assert(11 == (int)GrUserStencilOp::kSetClipAndReplaceUserBits); |
| static_assert(12 == (int)GrUserStencilOp::kZeroClipAndUserBits); |
| |
| void GrStencilSettings::Face::reset(const GrUserStencilSettings::Face& user, bool hasStencilClip, |
| int numStencilBits) { |
| SkASSERT(user.fTest < (GrUserStencilTest)kGrUserStencilTestCount); |
| SkASSERT(user.fPassOp < (GrUserStencilOp)kGrUserStencilOpCount); |
| SkASSERT(user.fFailOp < (GrUserStencilOp)kGrUserStencilOpCount); |
| SkASSERT(numStencilBits > 0 && numStencilBits <= 16); |
| int clipBit = 1 << (numStencilBits - 1); |
| int userMask = clipBit - 1; |
| |
| GrUserStencilOp maxOp = std::max(user.fPassOp, user.fFailOp); |
| SkDEBUGCODE(GrUserStencilOp otherOp = std::min(user.fPassOp, user.fFailOp);) |
| if (maxOp <= kLastUserOnlyStencilOp) { |
| // Ops that only modify user bits. |
| fWriteMask = user.fWriteMask & userMask; |
| SkASSERT(otherOp <= kLastUserOnlyStencilOp); |
| } else if (maxOp <= kLastClipOnlyStencilOp) { |
| // Ops that only modify the clip bit. |
| fWriteMask = clipBit; |
| SkASSERT(GrUserStencilOp::kKeep == otherOp || |
| (otherOp > kLastUserOnlyStencilOp && otherOp <= kLastClipOnlyStencilOp)); |
| } else { |
| // Ops that modify both clip and user bits. |
| fWriteMask = clipBit | (user.fWriteMask & userMask); |
| SkASSERT(GrUserStencilOp::kKeep == otherOp || otherOp > kLastClipOnlyStencilOp); |
| } |
| |
| fFailOp = gUserStencilOpToRaw[(int)user.fFailOp]; |
| fPassOp = gUserStencilOpToRaw[(int)user.fPassOp]; |
| |
| if (!hasStencilClip || user.fTest > kLastClippedStencilTest) { |
| // Ignore the clip. |
| fTestMask = user.fTestMask & userMask; |
| fTest = gUserStencilTestToRaw[(int)user.fTest]; |
| } else if (GrUserStencilTest::kAlwaysIfInClip != user.fTest) { |
| // Respect the clip. |
| fTestMask = clipBit | (user.fTestMask & userMask); |
| fTest = gUserStencilTestToRaw[(int)user.fTest]; |
| } else { |
| // Test only for clip. |
| fTestMask = clipBit; |
| fTest = GrStencilTest::kEqual; |
| } |
| |
| fRef = (clipBit | user.fRef) & (fTestMask | fWriteMask); |
| } |
| |
| void GrStencilSettings::Face::setDisabled() { |
| memset(this, 0, sizeof(*this)); |
| static_assert(0 == (int)GrStencilTest::kAlways); |
| static_assert(0 == (int)GrStencilOp::kKeep); |
| } |
| |
| static constexpr GrUserStencilSettings gZeroStencilClipBit( |
| GrUserStencilSettings::StaticInit< |
| 0x0000, |
| GrUserStencilTest::kAlways, |
| 0xffff, |
| GrUserStencilOp::kZeroClipBit, |
| GrUserStencilOp::kZeroClipBit, |
| 0x0000>() |
| ); |
| static constexpr GrUserStencilSettings gSetStencilClipBit( |
| GrUserStencilSettings::StaticInit< |
| 0x0000, |
| GrUserStencilTest::kAlways, |
| 0xffff, |
| GrUserStencilOp::kSetClipBit, |
| GrUserStencilOp::kSetClipBit, |
| 0x0000>() |
| ); |
| |
| const GrUserStencilSettings* GrStencilSettings::SetClipBitSettings(bool setToInside) { |
| return setToInside ? &gSetStencilClipBit : &gZeroStencilClipBit; |
| } |
| |
| void GrStencilSettings::genKey(skgpu::KeyBuilder* b, bool includeRefs) const { |
| b->addBits(6, fFlags, "stencilFlags"); |
| if (this->isDisabled()) { |
| return; |
| } |
| if (!this->isTwoSided()) { |
| if (includeRefs) { |
| b->addBytes(sizeof(Face), &fCWFace, "stencilCWFace"); |
| } else { |
| Face tempFace = fCWFace; |
| tempFace.fRef = 0; |
| b->addBytes(sizeof(Face), &tempFace, "stencilCWFace"); |
| } |
| } else { |
| if (includeRefs) { |
| b->addBytes(sizeof(Face), &fCWFace, "stencilCWFace"); |
| b->addBytes(sizeof(Face), &fCCWFace, "stencilCCWFace"); |
| } else { |
| Face tempFaces[2]; |
| tempFaces[0] = fCWFace; |
| tempFaces[0].fRef = 0; |
| tempFaces[1] = fCCWFace; |
| tempFaces[1].fRef = 0; |
| b->addBytes(sizeof(Face), &tempFaces[0], "stencilCWFace"); |
| b->addBytes(sizeof(Face), &tempFaces[1], "stencilCCWFace"); |
| } |
| } |
| // We rely on GrStencilSettings::Face being tightly packed for the key to be reliable. |
| static_assert(0 == offsetof(Face, fRef)); |
| static_assert(2 == sizeof(Face::fRef)); |
| static_assert(2 == offsetof(Face, fTest)); |
| static_assert(2 == sizeof(Face::fTest)); |
| static_assert(4 == offsetof(Face, fTestMask)); |
| static_assert(2 == sizeof(Face::fTestMask)); |
| static_assert(6 == offsetof(Face, fPassOp)); |
| static_assert(1 == sizeof(Face::fPassOp)); |
| static_assert(7 == offsetof(Face, fFailOp)); |
| static_assert(1 == sizeof(Face::fFailOp)); |
| static_assert(8 == offsetof(Face, fWriteMask)); |
| static_assert(2 == sizeof(Face::fWriteMask)); |
| static_assert(10 == sizeof(Face)); |
| } |
