1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
|
/*
* Copyright 2014 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef GrOptDrawState_DEFINED
#define GrOptDrawState_DEFINED
#include "GrDrawState.h"
#include "GrRODrawState.h"
/**
* Subclass of GrRODrawState that holds an optimized version of a GrDrawState. Like it's parent
* it is meant to be an immutable class, and simply adds a few helpful data members not in the
* base class.
*/
class GrOptDrawState : public GrRODrawState {
public:
bool operator== (const GrOptDrawState& that) const;
bool inputColorIsUsed() const { return fInputColorIsUsed; }
bool inputCoverageIsUsed() const { return fInputCoverageIsUsed; }
private:
/**
* Constructs and optimized drawState out of a GrRODrawState.
*/
GrOptDrawState(const GrDrawState& drawState, BlendOptFlags blendOptFlags,
GrBlendCoeff optSrcCoeff, GrBlendCoeff optDstCoeff);
/**
* Loops through all the color stage effects to check if the stage will ignore color input or
* always output a constant color. In the ignore color input case we can ignore all previous
* stages. In the constant color case, we can ignore all previous stages and
* the current one and set the state color to the constant color. Once we determine the so
* called first effective stage, we copy all the effective stages into our optimized
* state.
*/
void copyEffectiveColorStages(const GrDrawState& ds);
/**
* Loops through all the coverage stage effects to check if the stage will ignore color input.
* If a coverage stage will ignore input, then we can ignore all coverage stages before it. We
* loop to determine the first effective coverage stage, and then copy all of our effective
* coverage stages into our optimized state.
*/
void copyEffectiveCoverageStages(const GrDrawState& ds);
/**
* This function takes in a flag and removes the corresponding fixed function vertex attributes.
* The flags are in the same order as GrVertexAttribBinding array. If bit i of removeVAFlags is
* set, then vertex attributes with binding (GrVertexAttribute)i will be removed.
*/
void removeFixedFunctionVertexAttribs(uint8_t removeVAFlags);
/**
* Alter the OptDrawState (adjusting stages, vertex attribs, flags, etc.) based on the
* BlendOptFlags.
*/
void adjustFromBlendOpts();
// These flags are needed to protect the code from creating an unused uniform color/coverage
// which will cause shader compiler errors.
bool fInputColorIsUsed;
bool fInputCoverageIsUsed;
SkAutoSTArray<4, GrVertexAttrib> fOptVA;
BlendOptFlags fBlendOptFlags;
friend GrOptDrawState* GrDrawState::createOptState() const;
typedef GrRODrawState INHERITED;
};
#endif
|
