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 precision, 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*, true>& 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 } 68
