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/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef GrGLSL_impl_DEFINED
#define GrGLSL_impl_DEFINED
#include "SkString.h"
namespace {
template<int N>
GrSLConstantVec return_const_vecf(GrSLConstantVec constVec, SkString* outAppend, bool omitAppend) {
SkASSERT(kNone_GrSLConstantVec != constVec);
if (!omitAppend) {
if (kZeros_GrSLConstantVec == constVec) {
outAppend->append(GrGLSLZerosVecf(N));
} else {
outAppend->append(GrGLSLOnesVecf(N));
}
}
return constVec;
}
}
template <int N>
GrSLConstantVec GrGLSLModulatef(SkString* outAppend,
const char* in0,
const char* in1,
GrSLConstantVec default0,
GrSLConstantVec default1,
bool omitIfConstVec) {
SkASSERT(N > 0 && N <= 4);
SkASSERT(NULL != outAppend);
bool has0 = NULL != in0 && '\0' != *in0;
bool has1 = NULL != in1 && '\0' != *in1;
SkASSERT(has0 || kNone_GrSLConstantVec != default0);
SkASSERT(has1 || kNone_GrSLConstantVec != default1);
if (!has0 && !has1) {
SkASSERT(kZeros_GrSLConstantVec == default0 || kOnes_GrSLConstantVec == default0);
SkASSERT(kZeros_GrSLConstantVec == default1 || kOnes_GrSLConstantVec == default1);
if (kZeros_GrSLConstantVec == default0 || kZeros_GrSLConstantVec == default1) {
return return_const_vecf<N>(kZeros_GrSLConstantVec, outAppend, omitIfConstVec);
} else {
// both inputs are ones vectors
return return_const_vecf<N>(kOnes_GrSLConstantVec, outAppend, omitIfConstVec);
}
} else if (!has0) {
SkASSERT(kZeros_GrSLConstantVec == default0 || kOnes_GrSLConstantVec == default0);
if (kZeros_GrSLConstantVec == default0) {
return return_const_vecf<N>(kZeros_GrSLConstantVec, outAppend, omitIfConstVec);
} else {
outAppend->appendf("%s(%s)", GrGLSLFloatVectorTypeString(N), in1);
return kNone_GrSLConstantVec;
}
} else if (!has1) {
SkASSERT(kZeros_GrSLConstantVec == default1 || kOnes_GrSLConstantVec == default1);
if (kZeros_GrSLConstantVec == default1) {
return return_const_vecf<N>(kZeros_GrSLConstantVec, outAppend, omitIfConstVec);
} else {
outAppend->appendf("%s(%s)", GrGLSLFloatVectorTypeString(N), in0);
return kNone_GrSLConstantVec;
}
} else {
outAppend->appendf("%s((%s) * (%s))", GrGLSLFloatVectorTypeString(N), in0, in1);
return kNone_GrSLConstantVec;
}
}
template <int N>
GrSLConstantVec GrGLSLAddf(SkString* outAppend,
const char* in0,
const char* in1,
GrSLConstantVec default0,
GrSLConstantVec default1,
bool omitIfConstVec) {
SkASSERT(N > 0 && N <= 4);
SkASSERT(NULL != outAppend);
bool has0 = NULL != in0 && '\0' != *in0;
bool has1 = NULL != in1 && '\0' != *in1;
if (!has0 && !has1) {
SkASSERT(kNone_GrSLConstantVec != default0);
SkASSERT(kNone_GrSLConstantVec != default1);
int sum = (kOnes_GrSLConstantVec == default0) + (kOnes_GrSLConstantVec == default1);
if (0 == sum) {
return return_const_vecf<N>(kZeros_GrSLConstantVec, outAppend, omitIfConstVec);
} else if (1 == sum) {
outAppend->append(GrGLSLOnesVecf(N));
return return_const_vecf<N>(kOnes_GrSLConstantVec, outAppend, omitIfConstVec);
} else {
SkASSERT(2 == sum);
outAppend->appendf("%s(2)", GrGLSLFloatVectorTypeString(N));
return kNone_GrSLConstantVec;
}
} else if (!has0) {
SkASSERT(kNone_GrSLConstantVec != default0);
if (kZeros_GrSLConstantVec == default0) {
outAppend->appendf("%s(%s)", GrGLSLFloatVectorTypeString(N), in1);
} else {
outAppend->appendf("%s(%s) + %s",
GrGLSLFloatVectorTypeString(N),
in1,
GrGLSLOnesVecf(N));
}
return kNone_GrSLConstantVec;
} else if (!has1) {
SkASSERT(kNone_GrSLConstantVec != default1);
if (kZeros_GrSLConstantVec == default1) {
outAppend->appendf("%s(%s)", GrGLSLFloatVectorTypeString(N), in0);
} else {
outAppend->appendf("%s(%s) + %s",
GrGLSLFloatVectorTypeString(N),
in0,
GrGLSLOnesVecf(N));
}
return kNone_GrSLConstantVec;
} else {
outAppend->appendf("(%s(%s) + %s(%s))",
GrGLSLFloatVectorTypeString(N),
in0,
GrGLSLFloatVectorTypeString(N),
in1);
return kNone_GrSLConstantVec;
}
}
template <int N>
GrSLConstantVec GrGLSLSubtractf(SkString* outAppend,
const char* in0,
const char* in1,
GrSLConstantVec default0,
GrSLConstantVec default1,
bool omitIfConstVec) {
SkASSERT(N > 0 && N <= 4);
SkASSERT(NULL != outAppend);
bool has0 = NULL != in0 && '\0' != *in0;
bool has1 = NULL != in1 && '\0' != *in1;
if (!has0 && !has1) {
SkASSERT(kNone_GrSLConstantVec != default0);
SkASSERT(kNone_GrSLConstantVec != default1);
int diff = (kOnes_GrSLConstantVec == default0) - (kOnes_GrSLConstantVec == default1);
if (-1 == diff) {
outAppend->appendf("%s(-1)", GrGLSLFloatVectorTypeString(N));
return kNone_GrSLConstantVec;
} else if (0 == diff) {
return return_const_vecf<N>(kZeros_GrSLConstantVec, outAppend, omitIfConstVec);
} else {
SkASSERT(1 == diff);
return return_const_vecf<N>(kOnes_GrSLConstantVec, outAppend, omitIfConstVec);
}
} else if (!has0) {
SkASSERT(kNone_GrSLConstantVec != default0);
if (kZeros_GrSLConstantVec == default0) {
outAppend->appendf("-%s(%s)", GrGLSLFloatVectorTypeString(N), in1);
} else {
outAppend->appendf("%s - %s(%s)",
GrGLSLOnesVecf(N),
GrGLSLFloatVectorTypeString(N),
in1);
}
return kNone_GrSLConstantVec;
} else if (!has1) {
SkASSERT(kNone_GrSLConstantVec != default1);
if (kZeros_GrSLConstantVec == default1) {
outAppend->appendf("%s(%s)", GrGLSLFloatVectorTypeString(N), in0);
} else {
outAppend->appendf("%s(%s) - %s",
GrGLSLFloatVectorTypeString(N),
in0,
GrGLSLOnesVecf(N));
}
return kNone_GrSLConstantVec;
} else {
outAppend->appendf("(%s(%s) - %s(%s))",
GrGLSLFloatVectorTypeString(N),
in0,
GrGLSLFloatVectorTypeString(N),
in1);
return kNone_GrSLConstantVec;
}
}
#endif
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