blob: 6790f8fe33d1e4206a61e11da6400e95efd3994d [file] [log] [blame]
/*
* 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"
namespace skgpu {
class KeyBuilder;
}
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(skgpu::KeyBuilder* 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.
inline static constexpr GrStencilFlags kInvalid_PrivateFlag =
static_cast<GrStencilFlags>(kLast_StencilFlag << 1);
uint32_t fFlags;
Face fCWFace;
Face fCCWFace;
};
#endif