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, and a bit that indicates
14 * the source of the input coords.
15 */
16 enum {
17 kMatrixTypeKeyBits = 1,
18 kPositionCoords_Flag = 1 << kMatrixTypeKeyBits,
19 kTransformKeyBits = kMatrixTypeKeyBits + 1,
20 };
21
22 /**
23 * We specialize the vertex code for each of these matrix types.
24 */
25 enum MatrixType {
26 kNoPersp_MatrixType = 0,
27 kGeneral_MatrixType = 1,
28 };
29
30 uint32_t
getTransformKey(const SkTArray<const GrCoordTransform *,true> & coords,int numCoords) const31 GrPrimitiveProcessor::getTransformKey(const SkTArray<const GrCoordTransform*, true>& coords,
32 int numCoords) const {
33 uint32_t totalKey = 0;
34 for (int t = 0; t < numCoords; ++t) {
35 uint32_t key = 0;
36 const GrCoordTransform* coordTransform = coords[t];
37 if (coordTransform->getMatrix().hasPerspective()) {
38 key |= kGeneral_MatrixType;
39 } else {
40 key |= kNoPersp_MatrixType;
41 }
42
43 if (!this->hasExplicitLocalCoords()) {
44 key |= kPositionCoords_Flag;
45 }
46
47 key <<= kTransformKeyBits * t;
48
49 SkASSERT(0 == (totalKey & key)); // keys for each transform ought not to overlap
50 totalKey |= key;
51 }
52 return totalKey;
53 }
54