| /* |
| * Copyright 2016 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| |
| #ifndef GrStencilSettings_DEFINED |
| #define GrStencilSettings_DEFINED |
| |
| #include "include/core/SkRegion.h" |
| #include "src/gpu/GrUserStencilSettings.h" |
| |
| class GrProcessorKeyBuilder; |
| |
| enum class GrStencilTest : uint16_t { |
| kAlways, |
| kNever, |
| kGreater, |
| kGEqual, |
| kLess, |
| kLEqual, |
| kEqual, |
| kNotEqual |
| }; |
| static constexpr int kGrStencilTestCount = 1 + (int)GrStencilTest::kNotEqual; |
| |
| enum class GrStencilOp : uint8_t { |
| kKeep, |
| kZero, |
| kReplace, // Replace stencil value with fRef (only the bits enabled in fWriteMask). |
| kInvert, |
| kIncWrap, |
| kDecWrap, |
| // NOTE: clamping occurs before the write mask. So if the MSB is zero and masked out, stencil |
| // values will still wrap when using clamping ops. |
| kIncClamp, |
| kDecClamp |
| }; |
| static constexpr int kGrStencilOpCount = 1 + (int)GrStencilOp::kDecClamp; |
| |
| /** |
| * This class defines concrete stencil settings that map directly to the underlying hardware. It |
| * is deduced from user stencil settings, stencil clip status, and the number of bits in the |
| * target stencil buffer. |
| */ |
| class GrStencilSettings { |
| public: |
| GrStencilSettings() { this->setDisabled(); } |
| GrStencilSettings(const GrUserStencilSettings& user, bool hasStencilClip, int numStencilBits) { |
| this->reset(user, hasStencilClip, numStencilBits); |
| } |
| GrStencilSettings(const GrStencilSettings& that) { this->reset(that); } |
| GrStencilSettings& operator=(const GrStencilSettings& that) { this->reset(that); return *this; } |
| |
| void invalidate() { fFlags |= kInvalid_PrivateFlag; } |
| void setDisabled() { fFlags = kAll_StencilFlags; } |
| void reset(const GrUserStencilSettings&, bool hasStencilClip, int numStencilBits); |
| void reset(const GrStencilSettings&); |
| |
| bool isValid() const { return !(fFlags & kInvalid_PrivateFlag); } |
| bool isDisabled() const { SkASSERT(this->isValid()); return fFlags & kDisabled_StencilFlag; } |
| bool doesWrite() const { SkASSERT(this->isValid()); |
| return !(fFlags & kNoModifyStencil_StencilFlag); } |
| bool isTwoSided() const { SkASSERT(this->isValid()); |
| return !(fFlags & kSingleSided_StencilFlag); } |
| bool usesWrapOp() const { SkASSERT(this->isValid()); |
| return !(fFlags & kNoWrapOps_StencilFlag); } |
| |
| void genKey(GrProcessorKeyBuilder* b, bool includeRefsAndMasks) const; |
| |
| bool operator!=(const GrStencilSettings& that) const { return !(*this == that); } |
| bool operator==(const GrStencilSettings&) const; |
| |
| struct Face : public GrTStencilFaceSettings<GrStencilTest, GrStencilOp> { |
| void reset(const GrUserStencilSettings::Face&, bool useStencilClip, int numStencilBits); |
| void setDisabled(); |
| }; |
| |
| const Face& singleSidedFace() const { |
| SkASSERT(!this->isDisabled()); |
| SkASSERT(!this->isTwoSided()); |
| return fCWFace; |
| } |
| // Returns the stencil settings for triangles that wind clockwise in "post-origin" space. |
| // (i.e., the space that results after a potential y-axis flip on device space for bottom-left |
| // origins.) |
| const Face& postOriginCWFace(GrSurfaceOrigin origin) const { |
| SkASSERT(this->isTwoSided()); |
| return (kTopLeft_GrSurfaceOrigin == origin) ? fCWFace : fCCWFace; |
| } |
| // Returns the stencil settings for triangles that wind counter-clockwise in "post-origin" |
| // space. (i.e., the space that results after a potential y-axis flip on device space for |
| // bottom-left origins.) |
| const Face& postOriginCCWFace(GrSurfaceOrigin origin) const { |
| SkASSERT(this->isTwoSided()); |
| return (kTopLeft_GrSurfaceOrigin == origin) ? fCCWFace : fCWFace; |
| } |
| |
| /** Gets the user stencil settings to directly set the clip bit. */ |
| static const GrUserStencilSettings* SetClipBitSettings(bool setToInside); |
| |
| private: |
| // Internal flag for backends to optionally mark their tracked stencil state as invalid. |
| // NOTE: This value is outside the declared range of GrStencilFlags, but since that type is |
| // explicitly backed by 'int', it can still represent this constant. clang 11 complains about |
| // mixing enum types in bit operations, so this works around that. |
| static constexpr GrStencilFlags kInvalid_PrivateFlag = |
| static_cast<GrStencilFlags>(kLast_StencilFlag << 1); |
| |
| uint32_t fFlags; |
| Face fCWFace; |
| Face fCCWFace; |
| }; |
| |
| #endif |