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| 1 /* |
| 2 * Copyright 2014 Google Inc. |
| 3 * |
| 4 * Use of this source code is governed by a BSD-style license that can be |
| 5 * found in the LICENSE file. |
| 6 */ |
| 7 |
| 8 #include "GrPrimitiveProcessor.h" |
| 9 |
| 10 #include "GrCoordTransform.h" |
| 11 |
| 12 /** |
| 13 * The key for an individual coord transform is made up of a matrix type, a prec
ision, and a bit |
| 14 * that indicates the source of the input coords. |
| 15 */ |
| 16 enum { |
| 17 kMatrixTypeKeyBits = 1, |
| 18 kMatrixTypeKeyMask = (1 << kMatrixTypeKeyBits) - 1, |
| 19 |
| 20 kPrecisionBits = 2, |
| 21 kPrecisionShift = kMatrixTypeKeyBits, |
| 22 |
| 23 kPositionCoords_Flag = (1 << (kPrecisionShift + kPrecisionBits)), |
| 24 kDeviceCoords_Flag = kPositionCoords_Flag + kPositionCoords_Flag, |
| 25 |
| 26 kTransformKeyBits = kMatrixTypeKeyBits + kPrecisionBits + 2, |
| 27 }; |
| 28 |
| 29 GR_STATIC_ASSERT(kHigh_GrSLPrecision < (1 << kPrecisionBits)); |
| 30 |
| 31 /** |
| 32 * We specialize the vertex code for each of these matrix types. |
| 33 */ |
| 34 enum MatrixType { |
| 35 kNoPersp_MatrixType = 0, |
| 36 kGeneral_MatrixType = 1, |
| 37 }; |
| 38 |
| 39 uint32_t |
| 40 GrPrimitiveProcessor::getTransformKey(const SkTArray<const GrCoordTransform*, tr
ue>& coords) const { |
| 41 uint32_t totalKey = 0; |
| 42 for (int t = 0; t < coords.count(); ++t) { |
| 43 uint32_t key = 0; |
| 44 const GrCoordTransform* coordTransform = coords[t]; |
| 45 if (coordTransform->getMatrix().hasPerspective()) { |
| 46 key |= kGeneral_MatrixType; |
| 47 } else { |
| 48 key |= kNoPersp_MatrixType; |
| 49 } |
| 50 |
| 51 if (kLocal_GrCoordSet == coordTransform->sourceCoords() && |
| 52 !this->hasExplicitLocalCoords()) { |
| 53 key |= kPositionCoords_Flag; |
| 54 } else if (kDevice_GrCoordSet == coordTransform->sourceCoords()) { |
| 55 key |= kDeviceCoords_Flag; |
| 56 } |
| 57 |
| 58 GR_STATIC_ASSERT(kGrSLPrecisionCount <= (1 << kPrecisionBits)); |
| 59 key |= (coordTransform->precision() << kPrecisionShift); |
| 60 |
| 61 key <<= kTransformKeyBits * t; |
| 62 |
| 63 SkASSERT(0 == (totalKey & key)); // keys for each transform ought not to
overlap |
| 64 totalKey |= key; |
| 65 } |
| 66 return totalKey; |
| 67 } |
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