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/*
* 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 "GrStencil.h"
const GrStencilSettings GrStencilSettings::gDisabled = {
kKeep_StencilOp, kKeep_StencilOp,
kKeep_StencilOp, kKeep_StencilOp,
kAlways_StencilFunc, kAlways_StencilFunc,
0x0, 0x0,
0x0, 0x0,
0x0, 0x0
};
GR_STATIC_ASSERT(0 == kKeep_StencilOp);
GR_STATIC_ASSERT(0 == kAlways_StencilFunc);
////////////////////////////////////////////////////////////////////////////////
// Stencil Rules for Merging user stencil space into clip
// We can't include the clip bit in the ref or mask values because the division
// between user and clip bits in the stencil depends on the number of stencil
// bits in the runtime. Comments below indicate what the code should do to
// incorporate the clip bit into these settings.
///////
// Replace
// set the ref to be the clip bit, but mask it out for the test
static const GrStencilSettings gUserToClipReplace = {
kReplace_StencilOp, kReplace_StencilOp,
kZero_StencilOp, kZero_StencilOp,
kLess_StencilFunc, kLess_StencilFunc,
0xffffffff, 0xffffffff, // unset clip bit
0x0, 0x0, // set clip bit
0xffffffff, 0xffffffff
};
static const GrStencilSettings gInvUserToClipReplace = {
kReplace_StencilOp, kReplace_StencilOp,
kZero_StencilOp, kZero_StencilOp,
kEqual_StencilFunc, kEqual_StencilFunc,
0xffffffff, 0xffffffff, // unset clip bit
0x0, 0x0, // set clip bit
0xffffffff, 0xffffffff
};
///////
// Intersect
static const GrStencilSettings gUserToClipIsect = {
kReplace_StencilOp, kReplace_StencilOp,
kZero_StencilOp, kZero_StencilOp,
kLess_StencilFunc, kLess_StencilFunc,
0xffffffff, 0xffffffff,
0x0, 0x0, // set clip bit
0xffffffff, 0xffffffff
};
static const GrStencilSettings gInvUserToClipIsect = {
kReplace_StencilOp, kReplace_StencilOp,
kZero_StencilOp, kZero_StencilOp,
kEqual_StencilFunc, kEqual_StencilFunc,
0xffffffff, 0xffffffff,
0x0, 0x0, // set clip bit
0xffffffff, 0xffffffff
};
///////
// Difference
static const GrStencilSettings gUserToClipDiff = {
kReplace_StencilOp, kReplace_StencilOp,
kZero_StencilOp, kZero_StencilOp,
kEqual_StencilFunc, kEqual_StencilFunc,
0xffffffff, 0xffffffff,
0x0, 0x0, // set clip bit
0xffffffff, 0xffffffff
};
static const GrStencilSettings gInvUserToClipDiff = {
kReplace_StencilOp, kReplace_StencilOp,
kZero_StencilOp, kZero_StencilOp,
kLess_StencilFunc, kLess_StencilFunc,
0xffffffff, 0xffffffff,
0x0, 0x0, // set clip bit
0xffffffff, 0xffffffff
};
///////
// Union
// first pass makes all the passing cases >= just clip bit set.
static const GrStencilSettings gUserToClipUnionPass0 = {
kReplace_StencilOp, kReplace_StencilOp,
kKeep_StencilOp, kKeep_StencilOp,
kLEqual_StencilFunc, kLEqual_StencilFunc,
0xffffffff, 0xffffffff, // unset clip bit
0x00000001, 0x00000001, // set clip bit
0xffffffff, 0xffffffff
};
// second pass allows anything greater than just clip bit set to pass
static const GrStencilSettings gUserToClipUnionPass1 = {
kReplace_StencilOp, kReplace_StencilOp,
kZero_StencilOp, kZero_StencilOp,
kLEqual_StencilFunc, kLEqual_StencilFunc,
0xffffffff, 0xffffffff,
0x00000000, 0x00000000, // set clip bit
0xffffffff, 0xffffffff
};
// for inverse first pass finds non-zerp user with clip bit set
// and converts it to just clip bit set
static const GrStencilSettings gInvUserToClipUnionPass0 = {
kReplace_StencilOp, kReplace_StencilOp,
kKeep_StencilOp, kKeep_StencilOp,
kLess_StencilFunc, kLess_StencilFunc,
0xffffffff, 0xffffffff,
0x00000000, 0x00000000, // set clip bit
0xffffffff, 0xffffffff
};
// second pass lets anything through with a nonzero user portion
// and writes a ref value with just the clip bit set to it.
static const GrStencilSettings gInvUserToClipUnionPass1 = {
kReplace_StencilOp, kReplace_StencilOp,
kZero_StencilOp, kZero_StencilOp,
kLess_StencilFunc, kLess_StencilFunc,
0xffffffff, 0xffffffff, // unset clip bit
0x00000000, 0x00000000, // set clip bit
0xffffffff, 0xffffffff
};
///////
// Xor
static const GrStencilSettings gUserToClipXorPass0 = {
kInvert_StencilOp, kInvert_StencilOp,
kKeep_StencilOp, kKeep_StencilOp,
kEqual_StencilFunc, kEqual_StencilFunc,
0xffffffff, 0xffffffff, // unset clip bit
0x00000000, 0x00000000,
0xffffffff, 0xffffffff
};
static const GrStencilSettings gUserToClipXorPass1 = {
kReplace_StencilOp, kReplace_StencilOp,
kZero_StencilOp, kZero_StencilOp,
kGreater_StencilFunc, kGreater_StencilFunc,
0xffffffff, 0xffffffff,
0x00000000, 0x00000000, // set clip bit
0xffffffff, 0xffffffff
};
static const GrStencilSettings gInvUserToClipXorPass0 = {
kInvert_StencilOp, kInvert_StencilOp,
kKeep_StencilOp, kKeep_StencilOp,
kEqual_StencilFunc, kEqual_StencilFunc,
0xffffffff, 0xffffffff, // unset clip bit
0x00000000, 0x00000000,
0xffffffff, 0xffffffff
};
static const GrStencilSettings gInvUserToClipXorPass1 = {
kReplace_StencilOp, kReplace_StencilOp,
kZero_StencilOp, kZero_StencilOp,
kLess_StencilFunc, kLess_StencilFunc,
0xffffffff, 0xffffffff,
0x00000000, 0x00000000, // set clip bit
0xffffffff, 0xffffffff
};
///////
// Reverse Diff
static const GrStencilSettings gUserToClipRDiffPass0 = {
kInvert_StencilOp, kInvert_StencilOp,
kZero_StencilOp, kZero_StencilOp,
kLess_StencilFunc, kLess_StencilFunc,
0xffffffff, 0xffffffff, // unset clip bit
0x00000000, 0x00000000, // set clip bit
0xffffffff, 0xffffffff
};
static const GrStencilSettings gUserToClipRDiffPass1 = {
kReplace_StencilOp, kReplace_StencilOp,
kZero_StencilOp, kZero_StencilOp,
kEqual_StencilFunc, kEqual_StencilFunc,
0x00000000, 0x00000000, // set clip bit
0x00000000, 0x00000000, // set clip bit
0xffffffff, 0xffffffff
};
static const GrStencilSettings gInvUserToClipRDiff = {
kInvert_StencilOp, kInvert_StencilOp,
kZero_StencilOp, kZero_StencilOp,
kEqual_StencilFunc, kEqual_StencilFunc,
0xffffffff, 0xffffffff,
0x00000000, 0x00000000,
0x00000000, 0x00000000 // set clip bit
};
///////
// Direct to Stencil
// We can render a clip element directly without first writing to the client
// portion of the clip when the fill is not inverse and the set operation will
// only modify the in/out status of samples covered by the clip element.
// this one only works if used right after stencil clip was cleared.
// Our GrClip doesn't allow midstream replace ops.
static const GrStencilSettings gReplaceClip = {
kReplace_StencilOp, kReplace_StencilOp,
kReplace_StencilOp, kReplace_StencilOp,
kAlways_StencilFunc, kAlways_StencilFunc,
0xffffffff, 0xffffffff,
0x00000000, 0x00000000, // set clip bit
0x00000000, 0x00000000 // set clipBit
};
static const GrStencilSettings gUnionClip = {
kReplace_StencilOp, kReplace_StencilOp,
kReplace_StencilOp, kReplace_StencilOp,
kAlways_StencilFunc, kAlways_StencilFunc,
0xffffffff, 0xffffffff,
0x00000000, 0x00000000, // set clip bit
0x00000000, 0x00000000 // set clip bit
};
static const GrStencilSettings gXorClip = {
kInvert_StencilOp, kInvert_StencilOp,
kInvert_StencilOp, kInvert_StencilOp,
kAlways_StencilFunc, kAlways_StencilFunc,
0xffffffff, 0xffffffff,
0x00000000, 0x00000000,
0x00000000, 0x00000000 // set clip bit
};
static const GrStencilSettings gDiffClip = {
kZero_StencilOp, kZero_StencilOp,
kZero_StencilOp, kZero_StencilOp,
kAlways_StencilFunc, kAlways_StencilFunc,
0xffffffff, 0xffffffff,
0x00000000, 0x00000000,
0x00000000, 0x00000000 // set clip bit
};
bool GrStencilSettings::GetClipPasses(GrSetOp op,
bool canBeDirect,
unsigned int stencilClipMask,
bool invertedFill,
int* numPasses,
GrStencilSettings settings[kMaxStencilClipPasses]) {
if (canBeDirect && !invertedFill) {
*numPasses = 0;
switch (op) {
case kReplace_SetOp:
*numPasses = 1;
settings[0] = gReplaceClip;
break;
case kUnion_SetOp:
*numPasses = 1;
settings[0] = gUnionClip;
break;
case kXor_SetOp:
*numPasses = 1;
settings[0] = gXorClip;
break;
case kDifference_SetOp:
*numPasses = 1;
settings[0] = gDiffClip;
break;
default: // suppress warning
break;
}
if (1 == *numPasses) {
settings[0].fFrontFuncRef |= stencilClipMask;
settings[0].fFrontWriteMask |= stencilClipMask;
settings[0].fBackFuncRef = settings[0].fFrontFuncRef;
settings[0].fBackWriteMask = settings[0].fFrontWriteMask;
return true;
}
}
switch (op) {
// if we make the path renderer go to stencil we always give it a
// non-inverted fill and we use the stencil rules on the client->clipbit
// pass to select either the zeros or nonzeros.
case kReplace_SetOp:
*numPasses= 1;
settings[0] = invertedFill ? gInvUserToClipReplace : gUserToClipReplace;
settings[0].fFrontFuncMask &= ~stencilClipMask;
settings[0].fFrontFuncRef |= stencilClipMask;
settings[0].fBackFuncMask = settings[0].fFrontFuncMask;
settings[0].fBackFuncRef = settings[0].fFrontFuncRef;
break;
case kIntersect_SetOp:
*numPasses = 1;
settings[0] = invertedFill ? gInvUserToClipIsect : gUserToClipIsect;
settings[0].fFrontFuncRef = stencilClipMask;
settings[0].fBackFuncRef = settings[0].fFrontFuncRef;
break;
case kUnion_SetOp:
*numPasses = 2;
if (invertedFill) {
settings[0] = gInvUserToClipUnionPass0;
settings[0].fFrontFuncRef |= stencilClipMask;
settings[0].fBackFuncRef = settings[0].fFrontFuncMask;
settings[1] = gInvUserToClipUnionPass1;
settings[1].fFrontFuncMask &= ~stencilClipMask;
settings[1].fFrontFuncRef |= stencilClipMask;
settings[1].fBackFuncMask = settings[1].fFrontFuncMask;
settings[1].fBackFuncRef = settings[1].fFrontFuncRef;
} else {
settings[0] = gUserToClipUnionPass0;
settings[0].fFrontFuncMask &= ~stencilClipMask;
settings[0].fFrontFuncRef |= stencilClipMask;
settings[0].fBackFuncMask = settings[0].fFrontFuncMask;
settings[0].fBackFuncRef = settings[0].fFrontFuncRef;
settings[1] = gUserToClipUnionPass1;
settings[1].fFrontFuncRef |= stencilClipMask;
settings[1].fBackFuncRef = settings[1].fFrontFuncRef;
}
break;
case kXor_SetOp:
*numPasses = 2;
if (invertedFill) {
settings[0] = gInvUserToClipXorPass0;
settings[0].fFrontFuncMask &= ~stencilClipMask;
settings[0].fBackFuncMask = settings[0].fFrontFuncMask;
settings[1] = gInvUserToClipXorPass1;
settings[1].fFrontFuncRef |= stencilClipMask;
settings[1].fBackFuncRef = settings[1].fFrontFuncRef;
} else {
settings[0] = gUserToClipXorPass0;
settings[0].fFrontFuncMask &= ~stencilClipMask;
settings[0].fBackFuncMask = settings[0].fFrontFuncMask;
settings[1] = gUserToClipXorPass1;
settings[1].fFrontFuncRef |= stencilClipMask;
settings[1].fBackFuncRef = settings[1].fFrontFuncRef;
}
break;
case kDifference_SetOp:
*numPasses = 1;
settings[0] = invertedFill ? gInvUserToClipDiff : gUserToClipDiff;
settings[0].fFrontFuncRef |= stencilClipMask;
settings[0].fBackFuncRef = settings[0].fFrontFuncRef;
break;
case kReverseDifference_SetOp:
if (invertedFill) {
*numPasses = 1;
settings[0] = gInvUserToClipRDiff;
settings[0].fFrontWriteMask |= stencilClipMask;
settings[0].fBackWriteMask = settings[0].fFrontWriteMask;
} else {
*numPasses = 2;
settings[0] = gUserToClipRDiffPass0;
settings[0].fFrontFuncMask &= ~stencilClipMask;
settings[0].fBackFuncMask = settings[0].fFrontFuncMask;
settings[0].fFrontFuncRef |= stencilClipMask;
settings[0].fBackFuncRef = settings[0].fFrontFuncRef;
settings[1] = gUserToClipRDiffPass1;
settings[1].fFrontFuncMask |= stencilClipMask;
settings[1].fFrontFuncRef |= stencilClipMask;
settings[1].fBackFuncMask = settings[1].fFrontFuncMask;
settings[1].fBackFuncRef = settings[1].fFrontFuncRef;
}
break;
default:
GrCrash("Unknown set op");
}
return false;
}
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