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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 #ifndef GrProcOptInfo_DEFINED |
| 9 #define GrProcOptInfo_DEFINED |
| 10 |
| 11 #include "GrColor.h" |
| 12 #include "GrInvariantOutput.h" |
| 13 |
| 14 class GrFragmentStage; |
| 15 class GrGeometryProcessor; |
| 16 |
| 17 /** |
| 18 * GrProcOptInfo gathers invariant data from a set of processor stages.It is use
d to recognize |
| 19 * optimizations related to eliminating stages and vertex attributes that aren't
necessary for a |
| 20 * draw. |
| 21 */ |
| 22 class GrProcOptInfo { |
| 23 public: |
| 24 GrProcOptInfo() |
| 25 : fInOut(0, static_cast<GrColorComponentFlags>(0), false) |
| 26 , fFirstEffectStageIndex(0) |
| 27 , fInputColorIsUsed(true) |
| 28 , fInputColor(0) |
| 29 , fRemoveVertexAttrib(false) |
| 30 , fReadsDst(false) {} |
| 31 |
| 32 void calcWithInitialValues(const GrFragmentStage*, int stageCount, GrColor s
tartColor, |
| 33 GrColorComponentFlags flags, bool areCoverageStag
es, |
| 34 const GrGeometryProcessor* gp = NULL); |
| 35 |
| 36 bool isSolidWhite() const { return fInOut.isSolidWhite(); } |
| 37 bool isOpaque() const { return fInOut.isOpaque(); } |
| 38 |
| 39 GrColor color() const { return fInOut.color(); } |
| 40 uint8_t validFlags() const { return fInOut.validFlags(); } |
| 41 |
| 42 /** |
| 43 * Returns the index of the first effective color stage. If an intermediate
stage doesn't read |
| 44 * its input or has a known output, then we can ignore all earlier stages si
nce they will not |
| 45 * affect the final output. Thus the first effective stage index is the inde
x to the first stage |
| 46 * that will have an effect on the final output. |
| 47 * |
| 48 * If stages before the firstEffectiveStageIndex are removed, corresponding
values from |
| 49 * inputColorIsUsed(), inputColorToEffectiveStage(), removeVertexAttribs(),
and readsDst() must |
| 50 * be used when setting up the draw to ensure correct drawing. |
| 51 */ |
| 52 int firstEffectiveStageIndex() const { return fFirstEffectStageIndex; } |
| 53 |
| 54 /** |
| 55 * True if the first effective stage reads its input, false otherwise. |
| 56 */ |
| 57 bool inputColorIsUsed() const { return fInputColorIsUsed; } |
| 58 |
| 59 /** |
| 60 * If input color is used and per-vertex colors are not used, this is the in
put color to the |
| 61 * first effective stage. |
| 62 */ |
| 63 GrColor inputColorToEffectiveStage() const { return fInputColor; } |
| 64 |
| 65 /** |
| 66 * Given the set of optimizations determined by GrProcOptInfo, should the ca
ller remove the |
| 67 * color/coverage vertex attribute that was input to the first stage. |
| 68 */ |
| 69 bool removeVertexAttrib() const { return fRemoveVertexAttrib; } |
| 70 |
| 71 /** |
| 72 * Returns true if any of the stages preserved by GrProcOptInfo read the dst
color. |
| 73 */ |
| 74 bool readsDst() const { return fReadsDst; } |
| 75 |
| 76 private: |
| 77 GrInvariantOutput fInOut; |
| 78 int fFirstEffectStageIndex; |
| 79 bool fInputColorIsUsed; |
| 80 GrColor fInputColor; |
| 81 bool fRemoveVertexAttrib; |
| 82 bool fReadsDst; |
| 83 }; |
| 84 |
| 85 #endif |
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