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/*
* 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 GrPathStencilSettings_DEFINED
#define GrPathStencilSettings_DEFINED
#include "GrUserStencilSettings.h"
////////////////////////////////////////////////////////////////////////////////
// Stencil rules for paths
////// Even/Odd
static constexpr GrUserStencilSettings gEOStencilPass(
GrUserStencilSettings::StaticInit<
0xffff,
GrUserStencilTest::kAlwaysIfInClip,
0xffff,
GrUserStencilOp::kInvert,
GrUserStencilOp::kKeep,
0xffff>()
);
// ok not to check clip b/c stencil pass only wrote inside clip
static constexpr GrUserStencilSettings gEOColorPass(
GrUserStencilSettings::StaticInit<
0x0000,
GrUserStencilTest::kNotEqual,
0xffff,
GrUserStencilOp::kZero,
GrUserStencilOp::kZero,
0xffff>()
);
// have to check clip b/c outside clip will always be zero.
static constexpr GrUserStencilSettings gInvEOColorPass(
GrUserStencilSettings::StaticInit<
0x0000,
GrUserStencilTest::kEqualIfInClip,
0xffff,
GrUserStencilOp::kZero,
GrUserStencilOp::kZero,
0xffff>()
);
////// Winding
// when we have separate stencil we increment front faces / decrement back faces
// when we don't have wrap incr and decr we use the stencil test to simulate
// them.
static constexpr GrUserStencilSettings gWindStencilSeparateWithWrap(
GrUserStencilSettings::StaticInitSeparate<
0xffff, 0xffff,
GrUserStencilTest::kAlwaysIfInClip, GrUserStencilTest::kAlwaysIfInClip,
0xffff, 0xffff,
GrUserStencilOp::kIncWrap, GrUserStencilOp::kDecWrap,
GrUserStencilOp::kKeep, GrUserStencilOp::kKeep,
0xffff, 0xffff>()
);
// if inc'ing the max value, invert to make 0
// if dec'ing zero invert to make all ones.
// we can't avoid touching the stencil on both passing and
// failing, so we can't resctrict ourselves to the clip.
static constexpr GrUserStencilSettings gWindStencilSeparateNoWrap(
GrUserStencilSettings::StaticInitSeparate<
0xffff, 0x0000,
GrUserStencilTest::kEqual, GrUserStencilTest::kEqual,
0xffff, 0xffff,
GrUserStencilOp::kInvert, GrUserStencilOp::kInvert,
GrUserStencilOp::kIncMaybeClamp, GrUserStencilOp::kDecMaybeClamp,
0xffff, 0xffff>()
);
// When there are no separate faces we do two passes to setup the winding rule
// stencil. First we draw the front faces and inc, then we draw the back faces
// and dec. These are same as the above two split into the incrementing and
// decrementing passes.
static constexpr GrUserStencilSettings gWindSingleStencilWithWrapInc(
GrUserStencilSettings::StaticInit<
0xffff,
GrUserStencilTest::kAlwaysIfInClip,
0xffff,
GrUserStencilOp::kIncWrap,
GrUserStencilOp::kKeep,
0xffff>()
);
static constexpr GrUserStencilSettings gWindSingleStencilWithWrapDec(
GrUserStencilSettings::StaticInit<
0xffff,
GrUserStencilTest::kAlwaysIfInClip,
0xffff,
GrUserStencilOp::kDecWrap,
GrUserStencilOp::kKeep,
0xffff>()
);
static constexpr GrUserStencilSettings gWindSingleStencilNoWrapInc(
GrUserStencilSettings::StaticInit<
0xffff,
GrUserStencilTest::kEqual,
0xffff,
GrUserStencilOp::kInvert,
GrUserStencilOp::kIncMaybeClamp,
0xffff>()
);
static constexpr GrUserStencilSettings gWindSingleStencilNoWrapDec(
GrUserStencilSettings::StaticInit<
0x0000,
GrUserStencilTest::kEqual,
0xffff,
GrUserStencilOp::kInvert,
GrUserStencilOp::kDecMaybeClamp,
0xffff>()
);
// Color passes are the same whether we use the two-sided stencil or two passes
static constexpr GrUserStencilSettings gWindColorPass(
GrUserStencilSettings::StaticInit<
0x0000,
GrUserStencilTest::kLessIfInClip, // "0 < stencil" is equivalent to "0 != stencil".
0xffff,
GrUserStencilOp::kZero,
GrUserStencilOp::kZero,
0xffff>()
);
static constexpr GrUserStencilSettings gInvWindColorPass(
GrUserStencilSettings::StaticInit<
0x0000,
GrUserStencilTest::kEqualIfInClip,
0xffff,
GrUserStencilOp::kZero,
GrUserStencilOp::kZero,
0xffff>()
);
////// Normal render to stencil
// Sometimes the default path renderer can draw a path directly to the stencil
// buffer without having to first resolve the interior / exterior.
static constexpr GrUserStencilSettings gDirectToStencil(
GrUserStencilSettings::StaticInit<
0x0000,
GrUserStencilTest::kAlwaysIfInClip,
0xffff,
GrUserStencilOp::kZero,
GrUserStencilOp::kIncMaybeClamp,
0xffff>()
);
#endif
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