aboutsummaryrefslogtreecommitdiffhomepage
path: root/src/gpu/GrBatchAtlas.cpp
blob: ebd0907841ce3bb1f17694b5315f30aace5ad420 (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
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
/*
 * 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 "GrBatchAtlas.h"
#include "GrBatchFlushState.h"
#include "GrRectanizer.h"
#include "GrTracing.h"
#include "GrVertexBuffer.h"

static inline void adjust_for_offset(SkIPoint16* loc, const SkIPoint16& offset) {
    loc->fX += offset.fX;
    loc->fY += offset.fY;
}

static GrBatchAtlas::AtlasID create_id(uint32_t index, uint64_t generation) {
    SkASSERT(index < (1 << 16));
    SkASSERT(generation < ((uint64_t)1 << 48));
    return generation << 16 | index;
}

// The backing GrTexture for a GrBatchAtlas is broken into a spatial grid of GrBatchPlots.
// The GrBatchPlots keep track of subimage placement via their GrRectanizer. In turn, a GrBatchPlot
// manages the lifetime of its data using two tokens, a last ref toke and a last upload token.
// Once a GrBatchPlot is "full" (i.e. there is no room for the new subimage according to the
// GrRectanizer), it can no longer be used unless the last ref on the GrPlot has already been
// flushed through to the gpu.

class BatchPlot : public SkRefCnt {
public:
    SK_DECLARE_INTERNAL_LLIST_INTERFACE(BatchPlot);

    // index() refers to the index of the plot in the owning GrAtlas's plot array.  genID() is a
    // monotonically incrementing number which is bumped every time the cpu backing store is
    // wiped, or when the plot itself is evicted from the atlas(ie, there is continuity in genID()
    // across atlas spills)
    uint32_t index() const { return fIndex; }
    uint64_t genID() const { return fGenID; }
    GrBatchAtlas::AtlasID id() {
        SkASSERT(GrBatchAtlas::kInvalidAtlasID != fID);
        return fID;
    }

    GrTexture* texture() const { return fTexture; }

    bool addSubImage(int width, int height, const void* image, SkIPoint16* loc, size_t rowBytes)  {
        if (!fRects->addRect(width, height, loc)) {
            return false;
        }

        if (!fData) {
            fData = reinterpret_cast<unsigned char*>(sk_calloc_throw(fBytesPerPixel * fWidth *
                                                                     fHeight));
        }
        const unsigned char* imagePtr = (const unsigned char*)image;
        // point ourselves at the right starting spot
        unsigned char* dataPtr = fData;
        dataPtr += fBytesPerPixel * fWidth * loc->fY;
        dataPtr += fBytesPerPixel * loc->fX;
        // copy into the data buffer
        for (int i = 0; i < height; ++i) {
            memcpy(dataPtr, imagePtr, rowBytes);
            dataPtr += fBytesPerPixel * fWidth;
            imagePtr += rowBytes;
        }

        fDirtyRect.join(loc->fX, loc->fY, loc->fX + width, loc->fY + height);
        adjust_for_offset(loc, fOffset);
        SkDEBUGCODE(fDirty = true;)

        return true;
    }

    // to manage the lifetime of a plot, we use two tokens.  We use last upload token to know when
    // we can 'piggy back' uploads, ie if the last upload hasn't been flushed to gpu, we don't need
    // to issue a new upload even if we update the cpu backing store.  We use lastref to determine
    // when we can evict a plot from the cache, ie if the last ref has already flushed through
    // the gpu then we can reuse the plot
    GrBatchToken lastUploadToken() const { return fLastUpload; }
    GrBatchToken lastUseToken() const { return fLastUse; }
    void setLastUploadToken(GrBatchToken batchToken) {
        SkASSERT(batchToken >= fLastUpload);
        fLastUpload = batchToken;
    }
    void setLastUseToken(GrBatchToken batchToken) {
        SkASSERT(batchToken >= fLastUse);
        fLastUse = batchToken;
    }

    void uploadToTexture(GrBatchUploader::TextureUploader* uploader)  {
        // We should only be issuing uploads if we are in fact dirty
        SkASSERT(fDirty && fData && fTexture);
        TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("skia.gpu"), "GrBatchPlot::uploadToTexture");
        size_t rowBytes = fBytesPerPixel * fRects->width();
        const unsigned char* dataPtr = fData;
        dataPtr += rowBytes * fDirtyRect.fTop;
        dataPtr += fBytesPerPixel * fDirtyRect.fLeft;
        uploader->writeTexturePixels(fTexture,
                                     fOffset.fX + fDirtyRect.fLeft, fOffset.fY + fDirtyRect.fTop,
                                     fDirtyRect.width(), fDirtyRect.height(),
                                     fTexture->config(), dataPtr, rowBytes);
        fDirtyRect.setEmpty();
        SkDEBUGCODE(fDirty = false;)
    }

    void resetRects() {
        SkASSERT(fRects);
        fRects->reset();
        fGenID++;
        fID = create_id(fIndex, fGenID);

        // zero out the plot
        if (fData) {
            sk_bzero(fData, fBytesPerPixel * fWidth * fHeight);
        }

        fDirtyRect.setEmpty();
        SkDEBUGCODE(fDirty = false;)
    }

    uint32_t x() const { return fX; }
    uint32_t y() const { return fY; }

private:
    BatchPlot()
        : fLastUpload(0)
        , fLastUse(0)
        , fIndex(-1)
        , fGenID(-1)
        , fID(0)
        , fData(nullptr)
        , fWidth(0)
        , fHeight(0)
        , fX(0)
        , fY(0)
        , fTexture(nullptr)
        , fRects(nullptr)
        , fAtlas(nullptr)
        , fBytesPerPixel(1)
    #ifdef SK_DEBUG
        , fDirty(false)
    #endif
    {
        fOffset.set(0, 0);
    }

    ~BatchPlot() {
        sk_free(fData);
        fData = nullptr;
        delete fRects;
    }

    void init(GrBatchAtlas* atlas, GrTexture* texture, int index, uint64_t generation,
              int offX, int offY, int width, int height, size_t bpp) {
        fIndex = index;
        fGenID = generation;
        fID = create_id(index, generation);
        fWidth = width;
        fHeight = height;
        fX = offX;
        fY = offY;
        fRects = GrRectanizer::Factory(width, height);
        fAtlas = atlas;
        fOffset.set(offX * width, offY * height);
        fBytesPerPixel = bpp;
        fData = nullptr;
        fDirtyRect.setEmpty();
        SkDEBUGCODE(fDirty = false;)
        fTexture = texture;
    }

    GrBatchToken fLastUpload;
    GrBatchToken fLastUse;

    uint32_t fIndex;
    uint64_t fGenID;
    GrBatchAtlas::AtlasID fID;
    unsigned char* fData;
    uint32_t fWidth;
    uint32_t fHeight;
    uint32_t fX;
    uint32_t fY;
    GrTexture* fTexture;
    GrRectanizer* fRects;
    GrBatchAtlas* fAtlas;
    SkIPoint16 fOffset;        // the offset of the plot in the backing texture
    size_t fBytesPerPixel;
    SkIRect fDirtyRect;
    SkDEBUGCODE(bool fDirty;)

    friend class GrBatchAtlas;

    typedef SkRefCnt INHERITED;
};

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

class GrPlotUploader : public GrBatchUploader {
public:
    GrPlotUploader(BatchPlot* plot)
        : INHERITED(plot->lastUploadToken())
        , fPlot(SkRef(plot)) {
        SkASSERT(plot);
    }

    void upload(TextureUploader* uploader) override {
        fPlot->uploadToTexture(uploader);
    }

private:
    SkAutoTUnref<BatchPlot> fPlot;

    typedef GrBatchUploader INHERITED;
};

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

GrBatchAtlas::GrBatchAtlas(GrTexture* texture, int numPlotsX, int numPlotsY)
    : fTexture(texture)
    , fNumPlotsX(numPlotsX)
    , fNumPlotsY(numPlotsY)
    , fPlotWidth(texture->width() / numPlotsX)
    , fPlotHeight(texture->height() / numPlotsY)
    , fAtlasGeneration(kInvalidAtlasGeneration + 1) {
    SkASSERT(fNumPlotsX * fNumPlotsY <= BulkUseTokenUpdater::kMaxPlots);
    SkASSERT(fPlotWidth * fNumPlotsX == static_cast<uint32_t>(texture->width()));
    SkASSERT(fPlotHeight * fNumPlotsY == static_cast<uint32_t>(texture->height()));

    // We currently do not support compressed atlases...
    SkASSERT(!GrPixelConfigIsCompressed(texture->desc().fConfig));

    // set up allocated plots
    fBPP = GrBytesPerPixel(texture->desc().fConfig);
    fPlotArray = new SkAutoTUnref<BatchPlot>[(fNumPlotsX * fNumPlotsY)];

    SkAutoTUnref<BatchPlot>* currPlot = fPlotArray;
    for (int y = fNumPlotsY - 1, r = 0; y >= 0; --y, ++r) {
        for (int x = fNumPlotsX - 1, c = 0; x >= 0; --x, ++c) {
            uint32_t id = r * fNumPlotsX + c;
            currPlot->reset(new BatchPlot);
            (*currPlot)->init(this, texture, id, 1, x, y, fPlotWidth, fPlotHeight, fBPP);

            // build LRU list
            fPlotList.addToHead(currPlot->get());
            ++currPlot;
        }
    }
}

GrBatchAtlas::~GrBatchAtlas() {
    SkSafeUnref(fTexture);
    delete[] fPlotArray;
}

void GrBatchAtlas::processEviction(AtlasID id) {
    for (int i = 0; i < fEvictionCallbacks.count(); i++) {
        (*fEvictionCallbacks[i].fFunc)(id, fEvictionCallbacks[i].fData);
    }
}

void GrBatchAtlas::makeMRU(BatchPlot* plot) {
    if (fPlotList.head() == plot) {
        return;
    }

    fPlotList.remove(plot);
    fPlotList.addToHead(plot);
}

inline void GrBatchAtlas::updatePlot(GrDrawBatch::Target* target, AtlasID* id, BatchPlot* plot) {
    this->makeMRU(plot);

    // If our most recent upload has already occurred then we have to insert a new
    // upload. Otherwise, we already have a scheduled upload that hasn't yet ocurred.
    // This new update will piggy back on that previously scheduled update.
    if (target->hasTokenBeenFlushed(plot->lastUploadToken())) {
        plot->setLastUploadToken(target->asapToken());
        SkAutoTUnref<GrPlotUploader> uploader(new GrPlotUploader(plot));
        target->upload(uploader);
    }
    *id = plot->id();
}

bool GrBatchAtlas::addToAtlas(AtlasID* id, GrDrawBatch::Target* batchTarget,
                              int width, int height, const void* image, SkIPoint16* loc) {
    // We should already have a texture, TODO clean this up
    SkASSERT(fTexture &&
             static_cast<uint32_t>(width) <= fPlotWidth &&
             static_cast<uint32_t>(height) <= fPlotHeight);

    // now look through all allocated plots for one we can share, in Most Recently Refed order
    GrBatchPlotList::Iter plotIter;
    plotIter.init(fPlotList, GrBatchPlotList::Iter::kHead_IterStart);
    BatchPlot* plot;
    while ((plot = plotIter.get())) {
        if (plot->addSubImage(width, height, image, loc, fBPP * width)) {
            this->updatePlot(batchTarget, id, plot);
            return true;
        }
        plotIter.next();
    }

    // If the above fails, then see if the least recently refed plot has already been flushed to the
    // gpu
    plotIter.init(fPlotList, GrBatchPlotList::Iter::kTail_IterStart);
    plot = plotIter.get();
    SkASSERT(plot);
    if (batchTarget->hasTokenBeenFlushed(plot->lastUseToken())) {
        this->processEviction(plot->id());
        plot->resetRects();
        SkDEBUGCODE(bool verify = )plot->addSubImage(width, height, image, loc, fBPP * width);
        SkASSERT(verify);
        this->updatePlot(batchTarget, id, plot);
        fAtlasGeneration++;
        return true;
    }

    // The least recently refed plot hasn't been flushed to the gpu yet, however, if we have flushed
    // it to the batch target than we can reuse it.  Our last ref token is guaranteed to be less
    // than or equal to the current token.  If its 'less than' the current token, than we can spin
    // off the plot(ie let the batch target manage it) and create a new plot in its place in our
    // array.  If it is equal to the currentToken, then the caller has to flush draws to the batch
    // target so we can spin off the plot
    if (plot->lastUseToken() == batchTarget->currentToken()) {
        return false;
    }

    // We take an extra ref here so our plot isn't deleted when we reset its index in the array.
    plot->ref();
    int index = plot->index();
    int x = plot->x();
    int y = plot->y();
    uint64_t generation = plot->genID();

    this->processEviction(plot->id());
    fPlotList.remove(plot);
    SkAutoTUnref<BatchPlot>& newPlot = fPlotArray[plot->index()];
    newPlot.reset(new BatchPlot);
    newPlot->init(this, fTexture, index, ++generation, x, y, fPlotWidth, fPlotHeight, fBPP);

    fPlotList.addToHead(newPlot.get());
    SkDEBUGCODE(bool verify = )newPlot->addSubImage(width, height, image, loc, fBPP * width);
    SkASSERT(verify);
    newPlot->setLastUploadToken(batchTarget->currentToken());
    SkAutoTUnref<GrPlotUploader> uploader(new GrPlotUploader(newPlot));
    batchTarget->upload(uploader);
    *id = newPlot->id();
    plot->unref();
    fAtlasGeneration++;
    return true;
}

bool GrBatchAtlas::hasID(AtlasID id) {
    uint32_t index = GetIndexFromID(id);
    SkASSERT(index < fNumPlotsX * fNumPlotsY);
    return fPlotArray[index]->genID() == GetGenerationFromID(id);
}

void GrBatchAtlas::setLastUseToken(AtlasID id, GrBatchToken batchToken) {
    SkASSERT(this->hasID(id));
    uint32_t index = GetIndexFromID(id);
    SkASSERT(index < fNumPlotsX * fNumPlotsY);
    this->makeMRU(fPlotArray[index]);
    fPlotArray[index]->setLastUseToken(batchToken);
}

void GrBatchAtlas::setLastUseTokenBulk(const BulkUseTokenUpdater& updater,
                                       GrBatchToken batchToken) {
    int count = updater.fPlotsToUpdate.count();
    for (int i = 0; i < count; i++) {
        BatchPlot* plot = fPlotArray[updater.fPlotsToUpdate[i]];
        this->makeMRU(plot);
        plot->setLastUseToken(batchToken);
    }
}