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
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
|
/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef GrGLSLFragmentProcessor_DEFINED
#define GrGLSLFragmentProcessor_DEFINED
#include "glsl/GrGLSLProcessorTypes.h"
#include "glsl/GrGLSLProgramDataManager.h"
#include "glsl/GrGLSLTextureSampler.h"
class GrProcessor;
class GrProcessorKeyBuilder;
class GrGLSLCaps;
class GrGLSLFPBuilder;
class GrGLSLFPFragmentBuilder;
class GrGLSLUniformHandler;
class GrGLSLFragmentProcessor {
public:
GrGLSLFragmentProcessor() {}
virtual ~GrGLSLFragmentProcessor() {
for (int i = 0; i < fChildProcessors.count(); ++i) {
delete fChildProcessors[i];
}
}
typedef GrGLSLProgramDataManager::UniformHandle UniformHandle;
typedef GrGLSLTextureSampler::TextureSamplerArray TextureSamplerArray;
/** Called when the program stage should insert its code into the shaders. The code in each
shader will be in its own block ({}) and so locally scoped names will not collide across
stages.
@param builder Interface used to emit code in the shaders.
@param processor The processor that generated this program stage.
@param key The key that was computed by GenKey() from the generating GrProcessor.
@param outputColor A predefined vec4 in the FS in which the stage should place its output
color (or coverage).
@param inputColor A vec4 that holds the input color to the stage in the FS. This may be
nullptr in which case the implied input is solid white (all ones).
TODO: Better system for communicating optimization info (e.g. input
color is solid white, trans black, known to be opaque, etc.) that allows
the processor to communicate back similar known info about its output.
@param samplers Contains one entry for each GrTextureAccess of the GrProcessor. These
can be passed to the builder to emit texture reads in the generated
code.
*/
struct EmitArgs {
EmitArgs(GrGLSLFPFragmentBuilder* fragBuilder,
GrGLSLUniformHandler* uniformHandler,
const GrGLSLCaps* caps,
const GrFragmentProcessor& fp,
const char* outputColor,
const char* inputColor,
const GrGLSLTransformedCoordsArray& coords,
const TextureSamplerArray& samplers)
: fFragBuilder(fragBuilder)
, fUniformHandler(uniformHandler)
, fGLSLCaps(caps)
, fFp(fp)
, fOutputColor(outputColor)
, fInputColor(inputColor)
, fCoords(coords)
, fSamplers(samplers) {}
GrGLSLFPFragmentBuilder* fFragBuilder;
GrGLSLUniformHandler* fUniformHandler;
const GrGLSLCaps* fGLSLCaps;
const GrFragmentProcessor& fFp;
const char* fOutputColor;
const char* fInputColor;
const GrGLSLTransformedCoordsArray& fCoords;
const TextureSamplerArray& fSamplers;
};
virtual void emitCode(EmitArgs&) = 0;
void setData(const GrGLSLProgramDataManager& pdman, const GrFragmentProcessor& processor);
static void GenKey(const GrProcessor&, const GrGLSLCaps&, GrProcessorKeyBuilder*) {}
int numChildProcessors() const { return fChildProcessors.count(); }
GrGLSLFragmentProcessor* childProcessor(int index) const {
return fChildProcessors[index];
}
/** Will emit the code of a child proc in its own scope. Pass in the parent's EmitArgs and
* emitChild will automatically extract the coords and samplers of that child and pass them
* on to the child's emitCode(). Also, any uniforms or functions emitted by the child will
* have their names mangled to prevent redefinitions. The output color name is also mangled
* therefore in an in/out param. It will be declared in mangled form by emitChild(). It is
* legal to pass nullptr as inputColor, since all fragment processors are required to work
* without an input color.
*/
void emitChild(int childIndex, const char* inputColor, SkString* outputColor,
EmitArgs& parentArgs);
/** Variation that uses the parent's output color variable to hold the child's output.*/
void emitChild(int childIndex, const char* inputColor, EmitArgs& parentArgs);
protected:
/** A GrGLSLFragmentProcessor instance can be reused with any GrFragmentProcessor that produces
the same stage key; this function reads data from a GrFragmentProcessor and uploads any
uniform variables required by the shaders created in emitCode(). The GrFragmentProcessor
parameter is guaranteed to be of the same type that created this GrGLSLFragmentProcessor and
to have an identical processor key as the one that created this GrGLSLFragmentProcessor. */
// TODO update this to pass in GrFragmentProcessor
virtual void onSetData(const GrGLSLProgramDataManager&, const GrProcessor&) {}
private:
void internalEmitChild(int, const char*, const char*, EmitArgs&);
SkTArray<GrGLSLFragmentProcessor*, true> fChildProcessors;
friend class GrFragmentProcessor;
};
#endif
|
