aboutsummaryrefslogtreecommitdiffhomepage
path: root/src/gpu/GrXferProcessor.cpp
blob: b07b9720df69e6677fad14b27286bab90fc419b3 (plain)
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
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
/*
 * Copyright 2015 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#include "GrXferProcessor.h"
#include "GrPipeline.h"
#include "GrPipelineBuilder.h"
#include "GrProcOptInfo.h"
#include "gl/GrGLCaps.h"

GrXferProcessor::GrXferProcessor()
    : fWillReadDstColor(false)
    , fDstReadUsesMixedSamples(false)
    , fDstTextureOffset() {
}

GrXferProcessor::GrXferProcessor(const DstTexture* dstTexture,
                                 bool willReadDstColor,
                                 bool hasMixedSamples)
    : fWillReadDstColor(willReadDstColor)
    , fDstReadUsesMixedSamples(willReadDstColor && hasMixedSamples)
    , fDstTextureOffset() {
    if (dstTexture && dstTexture->texture()) {
        SkASSERT(willReadDstColor);
        fDstTexture.reset(dstTexture->texture());
        fDstTextureOffset = dstTexture->offset();
        this->addTextureAccess(&fDstTexture);
        this->setWillReadFragmentPosition();
    }
}

GrXferProcessor::OptFlags GrXferProcessor::getOptimizations(
                                                       const GrPipelineOptimizations& optimizations,
                                                       bool doesStencilWrite,
                                                       GrColor* overrideColor,
                                                       const GrCaps& caps) const {
    GrXferProcessor::OptFlags flags = this->onGetOptimizations(optimizations,
                                                               doesStencilWrite,
                                                               overrideColor,
                                                               caps);

    if (this->willReadDstColor()) {
        // When performing a dst read we handle coverage in the base class.
        SkASSERT(!(flags & GrXferProcessor::kIgnoreCoverage_OptFlag));
        if (optimizations.fCoveragePOI.isSolidWhite()) {
            flags |= GrXferProcessor::kIgnoreCoverage_OptFlag;
        }
    }
    return flags;
}

bool GrXferProcessor::hasSecondaryOutput() const {
    if (!this->willReadDstColor()) {
        return this->onHasSecondaryOutput();
    }
    return this->dstReadUsesMixedSamples();
}

void GrXferProcessor::getBlendInfo(BlendInfo* blendInfo) const {
    blendInfo->reset();
    if (!this->willReadDstColor()) {
        this->onGetBlendInfo(blendInfo);
    } else if (this->dstReadUsesMixedSamples()) {
        blendInfo->fDstBlend = kIS2A_GrBlendCoeff;
    }
}

void GrXferProcessor::getGLSLProcessorKey(const GrGLSLCaps& caps, GrProcessorKeyBuilder* b) const {
    uint32_t key = this->willReadDstColor() ? 0x1 : 0x0;
    if (key) {
        if (const GrTexture* dstTexture = this->getDstTexture()) {
            key |= 0x2;
            if (kTopLeft_GrSurfaceOrigin == dstTexture->origin()) {
                key |= 0x4;
            }
        }
        if (this->dstReadUsesMixedSamples()) {
            key |= 0x8;
        }
    }
    b->add32(key);
    this->onGetGLSLProcessorKey(caps, b);
}

GrXferBarrierType GrXferProcessor::xferBarrierType(const GrRenderTarget* rt,
                                                   const GrCaps& caps) const {
    SkASSERT(rt);
    if (static_cast<const GrSurface*>(rt) == this->getDstTexture()) {
        // Texture barriers are required when a shader reads and renders to the same texture.
        SkASSERT(caps.textureBarrierSupport());
        return kTexture_GrXferBarrierType;
    }
    return this->onXferBarrier(rt, caps);
}

#ifdef SK_DEBUG
static const char* equation_string(GrBlendEquation eq) {
    switch (eq) {
        case kAdd_GrBlendEquation:
            return "add";
        case kSubtract_GrBlendEquation:
            return "subtract";
        case kReverseSubtract_GrBlendEquation:
            return "reverse_subtract";
        case kScreen_GrBlendEquation:
            return "screen";
        case kOverlay_GrBlendEquation:
            return "overlay";
        case kDarken_GrBlendEquation:
            return "darken";
        case kLighten_GrBlendEquation:
            return "lighten";
        case kColorDodge_GrBlendEquation:
            return "color_dodge";
        case kColorBurn_GrBlendEquation:
            return "color_burn";
        case kHardLight_GrBlendEquation:
            return "hard_light";
        case kSoftLight_GrBlendEquation:
            return "soft_light";
        case kDifference_GrBlendEquation:
            return "difference";
        case kExclusion_GrBlendEquation:
            return "exclusion";
        case kMultiply_GrBlendEquation:
            return "multiply";
        case kHSLHue_GrBlendEquation:
            return "hsl_hue";
        case kHSLSaturation_GrBlendEquation:
            return "hsl_saturation";
        case kHSLColor_GrBlendEquation:
            return "hsl_color";
        case kHSLLuminosity_GrBlendEquation:
            return "hsl_luminosity";
    };
    return "";
}

static const char* coeff_string(GrBlendCoeff coeff) {
    switch (coeff) {
        case kZero_GrBlendCoeff:
            return "zero";
        case kOne_GrBlendCoeff:
            return "one";
        case kSC_GrBlendCoeff:
            return "src_color";
        case kISC_GrBlendCoeff:
            return "inv_src_color";
        case kDC_GrBlendCoeff:
            return "dst_color";
        case kIDC_GrBlendCoeff:
            return "inv_dst_color";
        case kSA_GrBlendCoeff:
            return "src_alpha";
        case kISA_GrBlendCoeff:
            return "inv_src_alpha";
        case kDA_GrBlendCoeff:
            return "dst_alpha";
        case kIDA_GrBlendCoeff:
            return "inv_dst_alpha";
        case kConstC_GrBlendCoeff:
            return "const_color";
        case kIConstC_GrBlendCoeff:
            return "inv_const_color";
        case kConstA_GrBlendCoeff:
            return "const_alpha";
        case kIConstA_GrBlendCoeff:
            return "inv_const_alpha";
        case kS2C_GrBlendCoeff:
            return "src2_color";
        case kIS2C_GrBlendCoeff:
            return "inv_src2_color";
        case kS2A_GrBlendCoeff:
            return "src2_alpha";
        case kIS2A_GrBlendCoeff:
            return "inv_src2_alpha";
    }
    return "";
}

SkString GrXferProcessor::BlendInfo::dump() const {
    SkString out;
    out.printf("write_color(%d) equation(%s) src_coeff(%s) dst_coeff:(%s) const(0x%08x)",
               fWriteColor, equation_string(fEquation), coeff_string(fSrcBlend),
               coeff_string(fDstBlend), fBlendConstant);
    return out;
}
#endif

///////////////////////////////////////////////////////////////////////////////

GrXferProcessor* GrXPFactory::createXferProcessor(const GrPipelineOptimizations& optimizations,
                                                  bool hasMixedSamples,
                                                  const DstTexture* dstTexture,
                                                  const GrCaps& caps) const {
#ifdef SK_DEBUG
    if (this->willReadDstColor(caps, optimizations, hasMixedSamples)) {
        if (!caps.shaderCaps()->dstReadInShaderSupport()) {
            SkASSERT(dstTexture && dstTexture->texture());
        } else {
            SkASSERT(!dstTexture || !dstTexture->texture()); 
        }
    } else {
        SkASSERT(!dstTexture || !dstTexture->texture()); 
    }
    SkASSERT(!hasMixedSamples || caps.shaderCaps()->dualSourceBlendingSupport());
#endif
    return this->onCreateXferProcessor(caps, optimizations, hasMixedSamples, dstTexture);
}

bool GrXPFactory::willNeedDstTexture(const GrCaps& caps,
                                     const GrPipelineOptimizations& optimizations,
                                     bool hasMixedSamples) const {
    return (this->willReadDstColor(caps, optimizations, hasMixedSamples) &&
            !caps.shaderCaps()->dstReadInShaderSupport());
}