68 lines
2.0 KiB
C++
68 lines
2.0 KiB
C++
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/*
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* Copyright 2014 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "GrPrimitiveProcessor.h"
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#include "GrCoordTransform.h"
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/**
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* The key for an individual coord transform is made up of a matrix type, a precision, and a bit
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* that indicates the source of the input coords.
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*/
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enum {
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kMatrixTypeKeyBits = 1,
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kMatrixTypeKeyMask = (1 << kMatrixTypeKeyBits) - 1,
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kPrecisionBits = 2,
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kPrecisionShift = kMatrixTypeKeyBits,
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kPositionCoords_Flag = (1 << (kPrecisionShift + kPrecisionBits)),
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kDeviceCoords_Flag = kPositionCoords_Flag + kPositionCoords_Flag,
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kTransformKeyBits = kMatrixTypeKeyBits + kPrecisionBits + 2,
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};
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GR_STATIC_ASSERT(kHigh_GrSLPrecision < (1 << kPrecisionBits));
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/**
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* We specialize the vertex code for each of these matrix types.
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*/
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enum MatrixType {
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kNoPersp_MatrixType = 0,
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kGeneral_MatrixType = 1,
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};
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uint32_t
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GrPrimitiveProcessor::getTransformKey(const SkTArray<const GrCoordTransform*, true>& coords) const {
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uint32_t totalKey = 0;
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for (int t = 0; t < coords.count(); ++t) {
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uint32_t key = 0;
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const GrCoordTransform* coordTransform = coords[t];
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if (coordTransform->getMatrix().hasPerspective()) {
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key |= kGeneral_MatrixType;
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} else {
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key |= kNoPersp_MatrixType;
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}
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if (kLocal_GrCoordSet == coordTransform->sourceCoords() &&
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!this->hasExplicitLocalCoords()) {
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key |= kPositionCoords_Flag;
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} else if (kDevice_GrCoordSet == coordTransform->sourceCoords()) {
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key |= kDeviceCoords_Flag;
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}
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GR_STATIC_ASSERT(kGrSLPrecisionCount <= (1 << kPrecisionBits));
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key |= (coordTransform->precision() << kPrecisionShift);
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key <<= kTransformKeyBits * t;
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SkASSERT(0 == (totalKey & key)); // keys for each transform ought not to overlap
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totalKey |= key;
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}
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return totalKey;
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}
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