GrDrawTarget.cpp revision 2a05de0c049a8648942a55016126a1f92e1c14d6 
1
2/*
3 * Copyright 2010 Google Inc.
4 *
5 * Use of this source code is governed by a BSD-style license that can be
6 * found in the LICENSE file.
7 */
8
9
10
11#include "GrDrawTarget.h"
12#include "GrContext.h"
13#include "GrDrawTargetCaps.h"
14#include "GrPath.h"
15#include "GrRenderTarget.h"
16#include "GrTexture.h"
17#include "GrVertexBuffer.h"
18
19#include "SkStrokeRec.h"
20
21////////////////////////////////////////////////////////////////////////////////
22
23GrDrawTarget::DrawInfo& GrDrawTarget::DrawInfo::operator =(const DrawInfo& di) {
24    fPrimitiveType  = di.fPrimitiveType;
25    fStartVertex    = di.fStartVertex;
26    fStartIndex     = di.fStartIndex;
27    fVertexCount    = di.fVertexCount;
28    fIndexCount     = di.fIndexCount;
29
30    fInstanceCount          = di.fInstanceCount;
31    fVerticesPerInstance    = di.fVerticesPerInstance;
32    fIndicesPerInstance     = di.fIndicesPerInstance;
33
34    if (NULL != di.fDevBounds) {
35        SkASSERT(di.fDevBounds == &di.fDevBoundsStorage);
36        fDevBoundsStorage = di.fDevBoundsStorage;
37        fDevBounds = &fDevBoundsStorage;
38    } else {
39        fDevBounds = NULL;
40    }
41
42    fDstCopy = di.fDstCopy;
43
44    return *this;
45}
46
47#ifdef SK_DEBUG
48bool GrDrawTarget::DrawInfo::isInstanced() const {
49    if (fInstanceCount > 0) {
50        SkASSERT(0 == fIndexCount % fIndicesPerInstance);
51        SkASSERT(0 == fVertexCount % fVerticesPerInstance);
52        SkASSERT(fIndexCount / fIndicesPerInstance == fInstanceCount);
53        SkASSERT(fVertexCount / fVerticesPerInstance == fInstanceCount);
54        // there is no way to specify a non-zero start index to drawIndexedInstances().
55        SkASSERT(0 == fStartIndex);
56        return true;
57    } else {
58        SkASSERT(!fVerticesPerInstance);
59        SkASSERT(!fIndicesPerInstance);
60        return false;
61    }
62}
63#endif
64
65void GrDrawTarget::DrawInfo::adjustInstanceCount(int instanceOffset) {
66    SkASSERT(this->isInstanced());
67    SkASSERT(instanceOffset + fInstanceCount >= 0);
68    fInstanceCount += instanceOffset;
69    fVertexCount = fVerticesPerInstance * fInstanceCount;
70    fIndexCount = fIndicesPerInstance * fInstanceCount;
71}
72
73void GrDrawTarget::DrawInfo::adjustStartVertex(int vertexOffset) {
74    fStartVertex += vertexOffset;
75    SkASSERT(fStartVertex >= 0);
76}
77
78void GrDrawTarget::DrawInfo::adjustStartIndex(int indexOffset) {
79    SkASSERT(this->isIndexed());
80    fStartIndex += indexOffset;
81    SkASSERT(fStartIndex >= 0);
82}
83
84////////////////////////////////////////////////////////////////////////////////
85
86#define DEBUG_INVAL_BUFFER 0xdeadcafe
87#define DEBUG_INVAL_START_IDX -1
88
89GrDrawTarget::GrDrawTarget(GrContext* context)
90    : fClip(NULL)
91    , fContext(context)
92    , fGpuTraceMarkerCount(0) {
93    SkASSERT(NULL != context);
94
95    fDrawState = &fDefaultDrawState;
96    // We assume that fDrawState always owns a ref to the object it points at.
97    fDefaultDrawState.ref();
98    GeometrySrcState& geoSrc = fGeoSrcStateStack.push_back();
99#ifdef SK_DEBUG
100    geoSrc.fVertexCount = DEBUG_INVAL_START_IDX;
101    geoSrc.fVertexBuffer = (GrVertexBuffer*)DEBUG_INVAL_BUFFER;
102    geoSrc.fIndexCount = DEBUG_INVAL_START_IDX;
103    geoSrc.fIndexBuffer = (GrIndexBuffer*)DEBUG_INVAL_BUFFER;
104#endif
105    geoSrc.fVertexSrc = kNone_GeometrySrcType;
106    geoSrc.fIndexSrc  = kNone_GeometrySrcType;
107}
108
109GrDrawTarget::~GrDrawTarget() {
110    SkASSERT(1 == fGeoSrcStateStack.count());
111    SkDEBUGCODE(GeometrySrcState& geoSrc = fGeoSrcStateStack.back());
112    SkASSERT(kNone_GeometrySrcType == geoSrc.fIndexSrc);
113    SkASSERT(kNone_GeometrySrcType == geoSrc.fVertexSrc);
114    fDrawState->unref();
115}
116
117void GrDrawTarget::releaseGeometry() {
118    int popCnt = fGeoSrcStateStack.count() - 1;
119    while (popCnt) {
120        this->popGeometrySource();
121        --popCnt;
122    }
123    this->resetVertexSource();
124    this->resetIndexSource();
125}
126
127void GrDrawTarget::setClip(const GrClipData* clip) {
128    clipWillBeSet(clip);
129    fClip = clip;
130}
131
132const GrClipData* GrDrawTarget::getClip() const {
133    return fClip;
134}
135
136void GrDrawTarget::setDrawState(GrDrawState*  drawState) {
137    SkASSERT(NULL != fDrawState);
138    if (NULL == drawState) {
139        drawState = &fDefaultDrawState;
140    }
141    if (fDrawState != drawState) {
142        fDrawState->unref();
143        drawState->ref();
144        fDrawState = drawState;
145    }
146}
147
148bool GrDrawTarget::reserveVertexSpace(size_t vertexSize,
149                                      int vertexCount,
150                                      void** vertices) {
151    GeometrySrcState& geoSrc = fGeoSrcStateStack.back();
152    bool acquired = false;
153    if (vertexCount > 0) {
154        SkASSERT(NULL != vertices);
155        this->releasePreviousVertexSource();
156        geoSrc.fVertexSrc = kNone_GeometrySrcType;
157
158        acquired = this->onReserveVertexSpace(vertexSize,
159                                              vertexCount,
160                                              vertices);
161    }
162    if (acquired) {
163        geoSrc.fVertexSrc = kReserved_GeometrySrcType;
164        geoSrc.fVertexCount = vertexCount;
165        geoSrc.fVertexSize = vertexSize;
166    } else if (NULL != vertices) {
167        *vertices = NULL;
168    }
169    return acquired;
170}
171
172bool GrDrawTarget::reserveIndexSpace(int indexCount,
173                                     void** indices) {
174    GeometrySrcState& geoSrc = fGeoSrcStateStack.back();
175    bool acquired = false;
176    if (indexCount > 0) {
177        SkASSERT(NULL != indices);
178        this->releasePreviousIndexSource();
179        geoSrc.fIndexSrc = kNone_GeometrySrcType;
180
181        acquired = this->onReserveIndexSpace(indexCount, indices);
182    }
183    if (acquired) {
184        geoSrc.fIndexSrc = kReserved_GeometrySrcType;
185        geoSrc.fIndexCount = indexCount;
186    } else if (NULL != indices) {
187        *indices = NULL;
188    }
189    return acquired;
190
191}
192
193bool GrDrawTarget::reserveVertexAndIndexSpace(int vertexCount,
194                                              int indexCount,
195                                              void** vertices,
196                                              void** indices) {
197    size_t vertexSize = this->drawState()->getVertexSize();
198    this->willReserveVertexAndIndexSpace(vertexCount, indexCount);
199    if (vertexCount) {
200        if (!this->reserveVertexSpace(vertexSize, vertexCount, vertices)) {
201            if (indexCount) {
202                this->resetIndexSource();
203            }
204            return false;
205        }
206    }
207    if (indexCount) {
208        if (!this->reserveIndexSpace(indexCount, indices)) {
209            if (vertexCount) {
210                this->resetVertexSource();
211            }
212            return false;
213        }
214    }
215    return true;
216}
217
218bool GrDrawTarget::geometryHints(int32_t* vertexCount,
219                                 int32_t* indexCount) const {
220    if (NULL != vertexCount) {
221        *vertexCount = -1;
222    }
223    if (NULL != indexCount) {
224        *indexCount = -1;
225    }
226    return false;
227}
228
229void GrDrawTarget::releasePreviousVertexSource() {
230    GeometrySrcState& geoSrc = fGeoSrcStateStack.back();
231    switch (geoSrc.fVertexSrc) {
232        case kNone_GeometrySrcType:
233            break;
234        case kArray_GeometrySrcType:
235            this->releaseVertexArray();
236            break;
237        case kReserved_GeometrySrcType:
238            this->releaseReservedVertexSpace();
239            break;
240        case kBuffer_GeometrySrcType:
241            geoSrc.fVertexBuffer->unref();
242#ifdef SK_DEBUG
243            geoSrc.fVertexBuffer = (GrVertexBuffer*)DEBUG_INVAL_BUFFER;
244#endif
245            break;
246        default:
247            GrCrash("Unknown Vertex Source Type.");
248            break;
249    }
250}
251
252void GrDrawTarget::releasePreviousIndexSource() {
253    GeometrySrcState& geoSrc = fGeoSrcStateStack.back();
254    switch (geoSrc.fIndexSrc) {
255        case kNone_GeometrySrcType:   // these two don't require
256            break;
257        case kArray_GeometrySrcType:
258            this->releaseIndexArray();
259            break;
260        case kReserved_GeometrySrcType:
261            this->releaseReservedIndexSpace();
262            break;
263        case kBuffer_GeometrySrcType:
264            geoSrc.fIndexBuffer->unref();
265#ifdef SK_DEBUG
266            geoSrc.fIndexBuffer = (GrIndexBuffer*)DEBUG_INVAL_BUFFER;
267#endif
268            break;
269        default:
270            GrCrash("Unknown Index Source Type.");
271            break;
272    }
273}
274
275void GrDrawTarget::setVertexSourceToArray(const void* vertexArray,
276                                          int vertexCount) {
277    this->releasePreviousVertexSource();
278    GeometrySrcState& geoSrc = fGeoSrcStateStack.back();
279    geoSrc.fVertexSrc = kArray_GeometrySrcType;
280    geoSrc.fVertexSize = this->drawState()->getVertexSize();
281    geoSrc.fVertexCount = vertexCount;
282    this->onSetVertexSourceToArray(vertexArray, vertexCount);
283}
284
285void GrDrawTarget::setIndexSourceToArray(const void* indexArray,
286                                         int indexCount) {
287    this->releasePreviousIndexSource();
288    GeometrySrcState& geoSrc = fGeoSrcStateStack.back();
289    geoSrc.fIndexSrc = kArray_GeometrySrcType;
290    geoSrc.fIndexCount = indexCount;
291    this->onSetIndexSourceToArray(indexArray, indexCount);
292}
293
294void GrDrawTarget::setVertexSourceToBuffer(const GrVertexBuffer* buffer) {
295    this->releasePreviousVertexSource();
296    GeometrySrcState& geoSrc = fGeoSrcStateStack.back();
297    geoSrc.fVertexSrc    = kBuffer_GeometrySrcType;
298    geoSrc.fVertexBuffer = buffer;
299    buffer->ref();
300    geoSrc.fVertexSize = this->drawState()->getVertexSize();
301}
302
303void GrDrawTarget::setIndexSourceToBuffer(const GrIndexBuffer* buffer) {
304    this->releasePreviousIndexSource();
305    GeometrySrcState& geoSrc = fGeoSrcStateStack.back();
306    geoSrc.fIndexSrc     = kBuffer_GeometrySrcType;
307    geoSrc.fIndexBuffer  = buffer;
308    buffer->ref();
309}
310
311void GrDrawTarget::resetVertexSource() {
312    this->releasePreviousVertexSource();
313    GeometrySrcState& geoSrc = fGeoSrcStateStack.back();
314    geoSrc.fVertexSrc = kNone_GeometrySrcType;
315}
316
317void GrDrawTarget::resetIndexSource() {
318    this->releasePreviousIndexSource();
319    GeometrySrcState& geoSrc = fGeoSrcStateStack.back();
320    geoSrc.fIndexSrc = kNone_GeometrySrcType;
321}
322
323void GrDrawTarget::pushGeometrySource() {
324    this->geometrySourceWillPush();
325    GeometrySrcState& newState = fGeoSrcStateStack.push_back();
326    newState.fIndexSrc = kNone_GeometrySrcType;
327    newState.fVertexSrc = kNone_GeometrySrcType;
328#ifdef SK_DEBUG
329    newState.fVertexCount  = ~0;
330    newState.fVertexBuffer = (GrVertexBuffer*)~0;
331    newState.fIndexCount   = ~0;
332    newState.fIndexBuffer = (GrIndexBuffer*)~0;
333#endif
334}
335
336void GrDrawTarget::popGeometrySource() {
337    // if popping last element then pops are unbalanced with pushes
338    SkASSERT(fGeoSrcStateStack.count() > 1);
339
340    this->geometrySourceWillPop(fGeoSrcStateStack.fromBack(1));
341    this->releasePreviousVertexSource();
342    this->releasePreviousIndexSource();
343    fGeoSrcStateStack.pop_back();
344}
345
346////////////////////////////////////////////////////////////////////////////////
347
348bool GrDrawTarget::checkDraw(GrPrimitiveType type, int startVertex,
349                             int startIndex, int vertexCount,
350                             int indexCount) const {
351    const GrDrawState& drawState = this->getDrawState();
352#ifdef SK_DEBUG
353    const GeometrySrcState& geoSrc = fGeoSrcStateStack.back();
354    int maxVertex = startVertex + vertexCount;
355    int maxValidVertex;
356    switch (geoSrc.fVertexSrc) {
357        case kNone_GeometrySrcType:
358            GrCrash("Attempting to draw without vertex src.");
359        case kReserved_GeometrySrcType: // fallthrough
360        case kArray_GeometrySrcType:
361            maxValidVertex = geoSrc.fVertexCount;
362            break;
363        case kBuffer_GeometrySrcType:
364            maxValidVertex = static_cast<int>(geoSrc.fVertexBuffer->sizeInBytes() / geoSrc.fVertexSize);
365            break;
366    }
367    if (maxVertex > maxValidVertex) {
368        GrCrash("Drawing outside valid vertex range.");
369    }
370    if (indexCount > 0) {
371        int maxIndex = startIndex + indexCount;
372        int maxValidIndex;
373        switch (geoSrc.fIndexSrc) {
374            case kNone_GeometrySrcType:
375                GrCrash("Attempting to draw indexed geom without index src.");
376            case kReserved_GeometrySrcType: // fallthrough
377            case kArray_GeometrySrcType:
378                maxValidIndex = geoSrc.fIndexCount;
379                break;
380            case kBuffer_GeometrySrcType:
381                maxValidIndex = static_cast<int>(geoSrc.fIndexBuffer->sizeInBytes() / sizeof(uint16_t));
382                break;
383        }
384        if (maxIndex > maxValidIndex) {
385            GrCrash("Index reads outside valid index range.");
386        }
387    }
388
389    SkASSERT(NULL != drawState.getRenderTarget());
390
391    for (int s = 0; s < drawState.numColorStages(); ++s) {
392        const GrEffectRef& effect = *drawState.getColorStage(s).getEffect();
393        int numTextures = effect->numTextures();
394        for (int t = 0; t < numTextures; ++t) {
395            GrTexture* texture = effect->texture(t);
396            SkASSERT(texture->asRenderTarget() != drawState.getRenderTarget());
397        }
398    }
399    for (int s = 0; s < drawState.numCoverageStages(); ++s) {
400        const GrEffectRef& effect = *drawState.getCoverageStage(s).getEffect();
401        int numTextures = effect->numTextures();
402        for (int t = 0; t < numTextures; ++t) {
403            GrTexture* texture = effect->texture(t);
404            SkASSERT(texture->asRenderTarget() != drawState.getRenderTarget());
405        }
406    }
407
408    SkASSERT(drawState.validateVertexAttribs());
409#endif
410    if (NULL == drawState.getRenderTarget()) {
411        return false;
412    }
413    return true;
414}
415
416bool GrDrawTarget::setupDstReadIfNecessary(GrDeviceCoordTexture* dstCopy, const SkRect* drawBounds) {
417    if (this->caps()->dstReadInShaderSupport() || !this->getDrawState().willEffectReadDstColor()) {
418        return true;
419    }
420    GrRenderTarget* rt = this->drawState()->getRenderTarget();
421    SkIRect copyRect;
422    const GrClipData* clip = this->getClip();
423    clip->getConservativeBounds(rt, &copyRect);
424
425    if (NULL != drawBounds) {
426        SkIRect drawIBounds;
427        drawBounds->roundOut(&drawIBounds);
428        if (!copyRect.intersect(drawIBounds)) {
429#ifdef SK_DEBUG
430            GrPrintf("Missed an early reject. Bailing on draw from setupDstReadIfNecessary.\n");
431#endif
432            return false;
433        }
434    } else {
435#ifdef SK_DEBUG
436        //GrPrintf("No dev bounds when dst copy is made.\n");
437#endif
438    }
439
440    // MSAA consideration: When there is support for reading MSAA samples in the shader we could
441    // have per-sample dst values by making the copy multisampled.
442    GrTextureDesc desc;
443    this->initCopySurfaceDstDesc(rt, &desc);
444    desc.fWidth = copyRect.width();
445    desc.fHeight = copyRect.height();
446
447    GrAutoScratchTexture ast(fContext, desc, GrContext::kApprox_ScratchTexMatch);
448
449    if (NULL == ast.texture()) {
450        GrPrintf("Failed to create temporary copy of destination texture.\n");
451        return false;
452    }
453    SkIPoint dstPoint = {0, 0};
454    if (this->copySurface(ast.texture(), rt, copyRect, dstPoint)) {
455        dstCopy->setTexture(ast.texture());
456        dstCopy->setOffset(copyRect.fLeft, copyRect.fTop);
457        return true;
458    } else {
459        return false;
460    }
461}
462
463void GrDrawTarget::drawIndexed(GrPrimitiveType type,
464                               int startVertex,
465                               int startIndex,
466                               int vertexCount,
467                               int indexCount,
468                               const SkRect* devBounds) {
469    if (indexCount > 0 && this->checkDraw(type, startVertex, startIndex, vertexCount, indexCount)) {
470        DrawInfo info;
471        info.fPrimitiveType = type;
472        info.fStartVertex   = startVertex;
473        info.fStartIndex    = startIndex;
474        info.fVertexCount   = vertexCount;
475        info.fIndexCount    = indexCount;
476
477        info.fInstanceCount         = 0;
478        info.fVerticesPerInstance   = 0;
479        info.fIndicesPerInstance    = 0;
480
481        if (NULL != devBounds) {
482            info.setDevBounds(*devBounds);
483        }
484        // TODO: We should continue with incorrect blending.
485        if (!this->setupDstReadIfNecessary(&info)) {
486            return;
487        }
488        this->onDraw(info);
489    }
490}
491
492void GrDrawTarget::drawNonIndexed(GrPrimitiveType type,
493                                  int startVertex,
494                                  int vertexCount,
495                                  const SkRect* devBounds) {
496    if (vertexCount > 0 && this->checkDraw(type, startVertex, -1, vertexCount, -1)) {
497        DrawInfo info;
498        info.fPrimitiveType = type;
499        info.fStartVertex   = startVertex;
500        info.fStartIndex    = 0;
501        info.fVertexCount   = vertexCount;
502        info.fIndexCount    = 0;
503
504        info.fInstanceCount         = 0;
505        info.fVerticesPerInstance   = 0;
506        info.fIndicesPerInstance    = 0;
507
508        if (NULL != devBounds) {
509            info.setDevBounds(*devBounds);
510        }
511        // TODO: We should continue with incorrect blending.
512        if (!this->setupDstReadIfNecessary(&info)) {
513            return;
514        }
515        this->onDraw(info);
516    }
517}
518
519void GrDrawTarget::stencilPath(const GrPath* path, SkPath::FillType fill) {
520    // TODO: extract portions of checkDraw that are relevant to path stenciling.
521    SkASSERT(NULL != path);
522    SkASSERT(this->caps()->pathRenderingSupport());
523    SkASSERT(!SkPath::IsInverseFillType(fill));
524    this->onStencilPath(path, fill);
525}
526
527void GrDrawTarget::drawPath(const GrPath* path, SkPath::FillType fill) {
528    // TODO: extract portions of checkDraw that are relevant to path rendering.
529    SkASSERT(NULL != path);
530    SkASSERT(this->caps()->pathRenderingSupport());
531    const GrDrawState* drawState = &getDrawState();
532
533    SkRect devBounds;
534    if (SkPath::IsInverseFillType(fill)) {
535        devBounds = SkRect::MakeWH(SkIntToScalar(drawState->getRenderTarget()->width()),
536                                   SkIntToScalar(drawState->getRenderTarget()->height()));
537    } else {
538        devBounds = path->getBounds();
539    }
540    SkMatrix viewM = drawState->getViewMatrix();
541    viewM.mapRect(&devBounds);
542
543    GrDeviceCoordTexture dstCopy;
544    if (!this->setupDstReadIfNecessary(&dstCopy, &devBounds)) {
545        return;
546    }
547
548    this->onDrawPath(path, fill, dstCopy.texture() ? &dstCopy : NULL);
549}
550
551void GrDrawTarget::drawPaths(size_t pathCount, const GrPath** paths,
552                             const SkMatrix* transforms,
553                             SkPath::FillType fill, SkStrokeRec::Style stroke) {
554    SkASSERT(pathCount > 0);
555    SkASSERT(NULL != paths);
556    SkASSERT(NULL != paths[0]);
557    SkASSERT(this->caps()->pathRenderingSupport());
558    SkASSERT(!SkPath::IsInverseFillType(fill));
559
560    const GrDrawState* drawState = &getDrawState();
561
562    SkRect devBounds;
563    for (size_t i = 0; i < pathCount; ++i) {
564        SkRect mappedPathBounds;
565        transforms[i].mapRect(&mappedPathBounds, paths[i]->getBounds());
566        devBounds.join(mappedPathBounds);
567    }
568
569    SkMatrix viewM = drawState->getViewMatrix();
570    viewM.mapRect(&devBounds);
571
572    GrDeviceCoordTexture dstCopy;
573    if (!this->setupDstReadIfNecessary(&dstCopy, &devBounds)) {
574        return;
575    }
576
577    this->onDrawPaths(pathCount, paths, transforms, fill, stroke,
578                      dstCopy.texture() ? &dstCopy : NULL);
579}
580
581void GrDrawTarget::addGpuTraceMarker(GrGpuTraceMarker* marker) {
582    if (this->caps()->gpuTracingSupport()) {
583        SkASSERT(fGpuTraceMarkerCount >= 0);
584        this->fActiveTraceMarkers.add(*marker);
585        this->didAddGpuTraceMarker();
586        ++fGpuTraceMarkerCount;
587    }
588}
589
590void GrDrawTarget::removeGpuTraceMarker(GrGpuTraceMarker* marker) {
591    if (this->caps()->gpuTracingSupport()) {
592        SkASSERT(fGpuTraceMarkerCount >= 1);
593        this->fActiveTraceMarkers.remove(*marker);
594        this->didRemoveGpuTraceMarker();
595        --fGpuTraceMarkerCount;
596    }
597}
598
599////////////////////////////////////////////////////////////////////////////////
600
601bool GrDrawTarget::willUseHWAALines() const {
602    // There is a conflict between using smooth lines and our use of premultiplied alpha. Smooth
603    // lines tweak the incoming alpha value but not in a premul-alpha way. So we only use them when
604    // our alpha is 0xff and tweaking the color for partial coverage is OK
605    if (!this->caps()->hwAALineSupport() ||
606        !this->getDrawState().isHWAntialiasState()) {
607        return false;
608    }
609    GrDrawState::BlendOptFlags opts = this->getDrawState().getBlendOpts();
610    return (GrDrawState::kDisableBlend_BlendOptFlag & opts) &&
611           (GrDrawState::kCoverageAsAlpha_BlendOptFlag & opts);
612}
613
614bool GrDrawTarget::canApplyCoverage() const {
615    // we can correctly apply coverage if a) we have dual source blending
616    // or b) one of our blend optimizations applies.
617    return this->caps()->dualSourceBlendingSupport() ||
618           GrDrawState::kNone_BlendOpt != this->getDrawState().getBlendOpts(true);
619}
620
621////////////////////////////////////////////////////////////////////////////////
622
623void GrDrawTarget::drawIndexedInstances(GrPrimitiveType type,
624                                        int instanceCount,
625                                        int verticesPerInstance,
626                                        int indicesPerInstance,
627                                        const SkRect* devBounds) {
628    if (!verticesPerInstance || !indicesPerInstance) {
629        return;
630    }
631
632    int maxInstancesPerDraw = this->indexCountInCurrentSource() / indicesPerInstance;
633    if (!maxInstancesPerDraw) {
634        return;
635    }
636
637    DrawInfo info;
638    info.fPrimitiveType = type;
639    info.fStartIndex = 0;
640    info.fStartVertex = 0;
641    info.fIndicesPerInstance = indicesPerInstance;
642    info.fVerticesPerInstance = verticesPerInstance;
643
644    // Set the same bounds for all the draws.
645    if (NULL != devBounds) {
646        info.setDevBounds(*devBounds);
647    }
648    // TODO: We should continue with incorrect blending.
649    if (!this->setupDstReadIfNecessary(&info)) {
650        return;
651    }
652
653    while (instanceCount) {
654        info.fInstanceCount = GrMin(instanceCount, maxInstancesPerDraw);
655        info.fVertexCount = info.fInstanceCount * verticesPerInstance;
656        info.fIndexCount = info.fInstanceCount * indicesPerInstance;
657
658        if (this->checkDraw(type,
659                            info.fStartVertex,
660                            info.fStartIndex,
661                            info.fVertexCount,
662                            info.fIndexCount)) {
663            this->onDraw(info);
664        }
665        info.fStartVertex += info.fVertexCount;
666        instanceCount -= info.fInstanceCount;
667    }
668}
669
670////////////////////////////////////////////////////////////////////////////////
671
672namespace {
673
674// position + (optional) texture coord
675extern const GrVertexAttrib gBWRectPosUVAttribs[] = {
676    {kVec2f_GrVertexAttribType, 0,               kPosition_GrVertexAttribBinding},
677    {kVec2f_GrVertexAttribType, sizeof(GrPoint), kLocalCoord_GrVertexAttribBinding}
678};
679
680void set_vertex_attributes(GrDrawState* drawState, bool hasUVs) {
681    if (hasUVs) {
682        drawState->setVertexAttribs<gBWRectPosUVAttribs>(2);
683    } else {
684        drawState->setVertexAttribs<gBWRectPosUVAttribs>(1);
685    }
686}
687
688};
689
690void GrDrawTarget::onDrawRect(const SkRect& rect,
691                              const SkMatrix* matrix,
692                              const SkRect* localRect,
693                              const SkMatrix* localMatrix) {
694
695    GrDrawState::AutoViewMatrixRestore avmr;
696    if (NULL != matrix) {
697        avmr.set(this->drawState(), *matrix);
698    }
699
700    set_vertex_attributes(this->drawState(), NULL != localRect);
701
702    AutoReleaseGeometry geo(this, 4, 0);
703    if (!geo.succeeded()) {
704        GrPrintf("Failed to get space for vertices!\n");
705        return;
706    }
707
708    size_t vsize = this->drawState()->getVertexSize();
709    geo.positions()->setRectFan(rect.fLeft, rect.fTop, rect.fRight, rect.fBottom, vsize);
710    if (NULL != localRect) {
711        GrPoint* coords = GrTCast<GrPoint*>(GrTCast<intptr_t>(geo.vertices()) +
712                                            sizeof(GrPoint));
713        coords->setRectFan(localRect->fLeft, localRect->fTop,
714                           localRect->fRight, localRect->fBottom,
715                           vsize);
716        if (NULL != localMatrix) {
717            localMatrix->mapPointsWithStride(coords, vsize, 4);
718        }
719    }
720    SkRect bounds;
721    this->getDrawState().getViewMatrix().mapRect(&bounds, rect);
722
723    this->drawNonIndexed(kTriangleFan_GrPrimitiveType, 0, 4, &bounds);
724}
725
726void GrDrawTarget::clipWillBeSet(const GrClipData* clipData) {
727}
728
729////////////////////////////////////////////////////////////////////////////////
730
731GrDrawTarget::AutoStateRestore::AutoStateRestore() {
732    fDrawTarget = NULL;
733}
734
735GrDrawTarget::AutoStateRestore::AutoStateRestore(GrDrawTarget* target,
736                                                 ASRInit init,
737                                                 const SkMatrix* vm) {
738    fDrawTarget = NULL;
739    this->set(target, init, vm);
740}
741
742GrDrawTarget::AutoStateRestore::~AutoStateRestore() {
743    if (NULL != fDrawTarget) {
744        fDrawTarget->setDrawState(fSavedState);
745        fSavedState->unref();
746    }
747}
748
749void GrDrawTarget::AutoStateRestore::set(GrDrawTarget* target, ASRInit init, const SkMatrix* vm) {
750    SkASSERT(NULL == fDrawTarget);
751    fDrawTarget = target;
752    fSavedState = target->drawState();
753    SkASSERT(fSavedState);
754    fSavedState->ref();
755    if (kReset_ASRInit == init) {
756        if (NULL == vm) {
757            // calls the default cons
758            fTempState.init();
759        } else {
760            SkNEW_IN_TLAZY(&fTempState, GrDrawState, (*vm));
761        }
762    } else {
763        SkASSERT(kPreserve_ASRInit == init);
764        if (NULL == vm) {
765            fTempState.set(*fSavedState);
766        } else {
767            SkNEW_IN_TLAZY(&fTempState, GrDrawState, (*fSavedState, *vm));
768        }
769    }
770    target->setDrawState(fTempState.get());
771}
772
773bool GrDrawTarget::AutoStateRestore::setIdentity(GrDrawTarget* target, ASRInit init) {
774    SkASSERT(NULL == fDrawTarget);
775    fDrawTarget = target;
776    fSavedState = target->drawState();
777    SkASSERT(fSavedState);
778    fSavedState->ref();
779    if (kReset_ASRInit == init) {
780        // calls the default cons
781        fTempState.init();
782    } else {
783        SkASSERT(kPreserve_ASRInit == init);
784        // calls the copy cons
785        fTempState.set(*fSavedState);
786        if (!fTempState.get()->setIdentityViewMatrix()) {
787            // let go of any resources held by the temp
788            fTempState.get()->reset();
789            fDrawTarget = NULL;
790            fSavedState->unref();
791            fSavedState = NULL;
792            return false;
793        }
794    }
795    target->setDrawState(fTempState.get());
796    return true;
797}
798
799////////////////////////////////////////////////////////////////////////////////
800
801GrDrawTarget::AutoReleaseGeometry::AutoReleaseGeometry(
802                                         GrDrawTarget*  target,
803                                         int vertexCount,
804                                         int indexCount) {
805    fTarget = NULL;
806    this->set(target, vertexCount, indexCount);
807}
808
809GrDrawTarget::AutoReleaseGeometry::AutoReleaseGeometry() {
810    fTarget = NULL;
811}
812
813GrDrawTarget::AutoReleaseGeometry::~AutoReleaseGeometry() {
814    this->reset();
815}
816
817bool GrDrawTarget::AutoReleaseGeometry::set(GrDrawTarget*  target,
818                                            int vertexCount,
819                                            int indexCount) {
820    this->reset();
821    fTarget = target;
822    bool success = true;
823    if (NULL != fTarget) {
824        fTarget = target;
825        success = target->reserveVertexAndIndexSpace(vertexCount,
826                                                     indexCount,
827                                                     &fVertices,
828                                                     &fIndices);
829        if (!success) {
830            fTarget = NULL;
831            this->reset();
832        }
833    }
834    SkASSERT(success == (NULL != fTarget));
835    return success;
836}
837
838void GrDrawTarget::AutoReleaseGeometry::reset() {
839    if (NULL != fTarget) {
840        if (NULL != fVertices) {
841            fTarget->resetVertexSource();
842        }
843        if (NULL != fIndices) {
844            fTarget->resetIndexSource();
845        }
846        fTarget = NULL;
847    }
848    fVertices = NULL;
849    fIndices = NULL;
850}
851
852GrDrawTarget::AutoClipRestore::AutoClipRestore(GrDrawTarget* target, const SkIRect& newClip) {
853    fTarget = target;
854    fClip = fTarget->getClip();
855    fStack.init();
856    fStack.get()->clipDevRect(newClip, SkRegion::kReplace_Op);
857    fReplacementClip.fClipStack = fStack.get();
858    target->setClip(&fReplacementClip);
859}
860
861namespace {
862// returns true if the read/written rect intersects the src/dst and false if not.
863bool clip_srcrect_and_dstpoint(const GrSurface* dst,
864                               const GrSurface* src,
865                               const SkIRect& srcRect,
866                               const SkIPoint& dstPoint,
867                               SkIRect* clippedSrcRect,
868                               SkIPoint* clippedDstPoint) {
869    *clippedSrcRect = srcRect;
870    *clippedDstPoint = dstPoint;
871
872    // clip the left edge to src and dst bounds, adjusting dstPoint if necessary
873    if (clippedSrcRect->fLeft < 0) {
874        clippedDstPoint->fX -= clippedSrcRect->fLeft;
875        clippedSrcRect->fLeft = 0;
876    }
877    if (clippedDstPoint->fX < 0) {
878        clippedSrcRect->fLeft -= clippedDstPoint->fX;
879        clippedDstPoint->fX = 0;
880    }
881
882    // clip the top edge to src and dst bounds, adjusting dstPoint if necessary
883    if (clippedSrcRect->fTop < 0) {
884        clippedDstPoint->fY -= clippedSrcRect->fTop;
885        clippedSrcRect->fTop = 0;
886    }
887    if (clippedDstPoint->fY < 0) {
888        clippedSrcRect->fTop -= clippedDstPoint->fY;
889        clippedDstPoint->fY = 0;
890    }
891
892    // clip the right edge to the src and dst bounds.
893    if (clippedSrcRect->fRight > src->width()) {
894        clippedSrcRect->fRight = src->width();
895    }
896    if (clippedDstPoint->fX + clippedSrcRect->width() > dst->width()) {
897        clippedSrcRect->fRight = clippedSrcRect->fLeft + dst->width() - clippedDstPoint->fX;
898    }
899
900    // clip the bottom edge to the src and dst bounds.
901    if (clippedSrcRect->fBottom > src->height()) {
902        clippedSrcRect->fBottom = src->height();
903    }
904    if (clippedDstPoint->fY + clippedSrcRect->height() > dst->height()) {
905        clippedSrcRect->fBottom = clippedSrcRect->fTop + dst->height() - clippedDstPoint->fY;
906    }
907
908    // The above clipping steps may have inverted the rect if it didn't intersect either the src or
909    // dst bounds.
910    return !clippedSrcRect->isEmpty();
911}
912}
913
914bool GrDrawTarget::copySurface(GrSurface* dst,
915                               GrSurface* src,
916                               const SkIRect& srcRect,
917                               const SkIPoint& dstPoint) {
918    SkASSERT(NULL != dst);
919    SkASSERT(NULL != src);
920
921    SkIRect clippedSrcRect;
922    SkIPoint clippedDstPoint;
923    // If the rect is outside the src or dst then we've already succeeded.
924    if (!clip_srcrect_and_dstpoint(dst,
925                                   src,
926                                   srcRect,
927                                   dstPoint,
928                                   &clippedSrcRect,
929                                   &clippedDstPoint)) {
930        SkASSERT(this->canCopySurface(dst, src, srcRect, dstPoint));
931        return true;
932    }
933
934    bool result = this->onCopySurface(dst, src, clippedSrcRect, clippedDstPoint);
935    SkASSERT(result == this->canCopySurface(dst, src, clippedSrcRect, clippedDstPoint));
936    return result;
937}
938
939bool GrDrawTarget::canCopySurface(GrSurface* dst,
940                                  GrSurface* src,
941                                  const SkIRect& srcRect,
942                                  const SkIPoint& dstPoint) {
943    SkASSERT(NULL != dst);
944    SkASSERT(NULL != src);
945
946    SkIRect clippedSrcRect;
947    SkIPoint clippedDstPoint;
948    // If the rect is outside the src or dst then we're guaranteed success
949    if (!clip_srcrect_and_dstpoint(dst,
950                                   src,
951                                   srcRect,
952                                   dstPoint,
953                                   &clippedSrcRect,
954                                   &clippedDstPoint)) {
955        return true;
956    }
957    return this->onCanCopySurface(dst, src, clippedSrcRect, clippedDstPoint);
958}
959
960bool GrDrawTarget::onCanCopySurface(GrSurface* dst,
961                                    GrSurface* src,
962                                    const SkIRect& srcRect,
963                                    const SkIPoint& dstPoint) {
964    // Check that the read/write rects are contained within the src/dst bounds.
965    SkASSERT(!srcRect.isEmpty());
966    SkASSERT(SkIRect::MakeWH(src->width(), src->height()).contains(srcRect));
967    SkASSERT(dstPoint.fX >= 0 && dstPoint.fY >= 0);
968    SkASSERT(dstPoint.fX + srcRect.width() <= dst->width() &&
969             dstPoint.fY + srcRect.height() <= dst->height());
970
971    return !dst->isSameAs(src) && NULL != dst->asRenderTarget() && NULL != src->asTexture();
972}
973
974bool GrDrawTarget::onCopySurface(GrSurface* dst,
975                                 GrSurface* src,
976                                 const SkIRect& srcRect,
977                                 const SkIPoint& dstPoint) {
978    if (!GrDrawTarget::onCanCopySurface(dst, src, srcRect, dstPoint)) {
979        return false;
980    }
981
982    GrRenderTarget* rt = dst->asRenderTarget();
983    GrTexture* tex = src->asTexture();
984
985    GrDrawTarget::AutoStateRestore asr(this, kReset_ASRInit);
986    this->drawState()->setRenderTarget(rt);
987    SkMatrix matrix;
988    matrix.setTranslate(SkIntToScalar(srcRect.fLeft - dstPoint.fX),
989                        SkIntToScalar(srcRect.fTop - dstPoint.fY));
990    matrix.postIDiv(tex->width(), tex->height());
991    this->drawState()->addColorTextureEffect(tex, matrix);
992    SkIRect dstRect = SkIRect::MakeXYWH(dstPoint.fX,
993                                        dstPoint.fY,
994                                        srcRect.width(),
995                                        srcRect.height());
996    this->drawSimpleRect(dstRect);
997    return true;
998}
999
1000void GrDrawTarget::initCopySurfaceDstDesc(const GrSurface* src, GrTextureDesc* desc) {
1001    // Make the dst of the copy be a render target because the default copySurface draws to the dst.
1002    desc->fOrigin = kDefault_GrSurfaceOrigin;
1003    desc->fFlags = kRenderTarget_GrTextureFlagBit | kNoStencil_GrTextureFlagBit;
1004    desc->fConfig = src->config();
1005}
1006
1007///////////////////////////////////////////////////////////////////////////////
1008
1009void GrDrawTargetCaps::reset() {
1010    f8BitPaletteSupport = false;
1011    fMipMapSupport = false;
1012    fNPOTTextureTileSupport = false;
1013    fTwoSidedStencilSupport = false;
1014    fStencilWrapOpsSupport = false;
1015    fHWAALineSupport = false;
1016    fShaderDerivativeSupport = false;
1017    fGeometryShaderSupport = false;
1018    fDualSourceBlendingSupport = false;
1019    fBufferLockSupport = false;
1020    fPathRenderingSupport = false;
1021    fDstReadInShaderSupport = false;
1022    fReuseScratchTextures = true;
1023    fGpuTracingSupport = false;
1024
1025    fMaxRenderTargetSize = 0;
1026    fMaxTextureSize = 0;
1027    fMaxSampleCount = 0;
1028
1029    memset(fConfigRenderSupport, 0, sizeof(fConfigRenderSupport));
1030}
1031
1032GrDrawTargetCaps& GrDrawTargetCaps::operator=(const GrDrawTargetCaps& other) {
1033    f8BitPaletteSupport = other.f8BitPaletteSupport;
1034    fMipMapSupport = other.fMipMapSupport;
1035    fNPOTTextureTileSupport = other.fNPOTTextureTileSupport;
1036    fTwoSidedStencilSupport = other.fTwoSidedStencilSupport;
1037    fStencilWrapOpsSupport = other.fStencilWrapOpsSupport;
1038    fHWAALineSupport = other.fHWAALineSupport;
1039    fShaderDerivativeSupport = other.fShaderDerivativeSupport;
1040    fGeometryShaderSupport = other.fGeometryShaderSupport;
1041    fDualSourceBlendingSupport = other.fDualSourceBlendingSupport;
1042    fBufferLockSupport = other.fBufferLockSupport;
1043    fPathRenderingSupport = other.fPathRenderingSupport;
1044    fDstReadInShaderSupport = other.fDstReadInShaderSupport;
1045    fReuseScratchTextures = other.fReuseScratchTextures;
1046    fGpuTracingSupport = other.fGpuTracingSupport;
1047
1048    fMaxRenderTargetSize = other.fMaxRenderTargetSize;
1049    fMaxTextureSize = other.fMaxTextureSize;
1050    fMaxSampleCount = other.fMaxSampleCount;
1051
1052    memcpy(fConfigRenderSupport, other.fConfigRenderSupport, sizeof(fConfigRenderSupport));
1053
1054    return *this;
1055}
1056
1057SkString GrDrawTargetCaps::dump() const {
1058    SkString r;
1059    static const char* gNY[] = {"NO", "YES"};
1060    r.appendf("8 Bit Palette Support       : %s\n", gNY[f8BitPaletteSupport]);
1061    r.appendf("MIP Map Support             : %s\n", gNY[fMipMapSupport]);
1062    r.appendf("NPOT Texture Tile Support   : %s\n", gNY[fNPOTTextureTileSupport]);
1063    r.appendf("Two Sided Stencil Support   : %s\n", gNY[fTwoSidedStencilSupport]);
1064    r.appendf("Stencil Wrap Ops  Support   : %s\n", gNY[fStencilWrapOpsSupport]);
1065    r.appendf("HW AA Lines Support         : %s\n", gNY[fHWAALineSupport]);
1066    r.appendf("Shader Derivative Support   : %s\n", gNY[fShaderDerivativeSupport]);
1067    r.appendf("Geometry Shader Support     : %s\n", gNY[fGeometryShaderSupport]);
1068    r.appendf("Dual Source Blending Support: %s\n", gNY[fDualSourceBlendingSupport]);
1069    r.appendf("Buffer Lock Support         : %s\n", gNY[fBufferLockSupport]);
1070    r.appendf("Path Rendering Support      : %s\n", gNY[fPathRenderingSupport]);
1071    r.appendf("Dst Read In Shader Support  : %s\n", gNY[fDstReadInShaderSupport]);
1072    r.appendf("Reuse Scratch Textures      : %s\n", gNY[fReuseScratchTextures]);
1073    r.appendf("Gpu Tracing Support         : %s\n", gNY[fGpuTracingSupport]);
1074    r.appendf("Max Texture Size            : %d\n", fMaxTextureSize);
1075    r.appendf("Max Render Target Size      : %d\n", fMaxRenderTargetSize);
1076    r.appendf("Max Sample Count            : %d\n", fMaxSampleCount);
1077
1078    static const char* kConfigNames[] = {
1079        "Unknown",  // kUnknown_GrPixelConfig
1080        "Alpha8",   // kAlpha_8_GrPixelConfig,
1081        "Index8",   // kIndex_8_GrPixelConfig,
1082        "RGB565",   // kRGB_565_GrPixelConfig,
1083        "RGBA444",  // kRGBA_4444_GrPixelConfig,
1084        "RGBA8888", // kRGBA_8888_GrPixelConfig,
1085        "BGRA8888", // kBGRA_8888_GrPixelConfig,
1086    };
1087    GR_STATIC_ASSERT(0 == kUnknown_GrPixelConfig);
1088    GR_STATIC_ASSERT(1 == kAlpha_8_GrPixelConfig);
1089    GR_STATIC_ASSERT(2 == kIndex_8_GrPixelConfig);
1090    GR_STATIC_ASSERT(3 == kRGB_565_GrPixelConfig);
1091    GR_STATIC_ASSERT(4 == kRGBA_4444_GrPixelConfig);
1092    GR_STATIC_ASSERT(5 == kRGBA_8888_GrPixelConfig);
1093    GR_STATIC_ASSERT(6 == kBGRA_8888_GrPixelConfig);
1094    GR_STATIC_ASSERT(SK_ARRAY_COUNT(kConfigNames) == kGrPixelConfigCnt);
1095
1096    SkASSERT(!fConfigRenderSupport[kUnknown_GrPixelConfig][0]);
1097    SkASSERT(!fConfigRenderSupport[kUnknown_GrPixelConfig][1]);
1098    for (size_t i = 0; i < SK_ARRAY_COUNT(kConfigNames); ++i)  {
1099        if (i != kUnknown_GrPixelConfig) {
1100            r.appendf("%s is renderable: %s, with MSAA: %s\n",
1101                     kConfigNames[i],
1102                     gNY[fConfigRenderSupport[i][0]],
1103                     gNY[fConfigRenderSupport[i][1]]);
1104        }
1105    }
1106    return r;
1107}
1108