GrDrawTarget.cpp revision a2c2323005fb22e564426f4ed86adaa6d213aba1 
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 "GrSurfacePriv.h"
17#include "GrTemplates.h"
18#include "GrTexture.h"
19#include "GrVertexBuffer.h"
20
21#include "SkStrokeRec.h"
22
23////////////////////////////////////////////////////////////////////////////////
24
25GrDrawTarget::DrawInfo& GrDrawTarget::DrawInfo::operator =(const DrawInfo& di) {
26    fPrimitiveType  = di.fPrimitiveType;
27    fStartVertex    = di.fStartVertex;
28    fStartIndex     = di.fStartIndex;
29    fVertexCount    = di.fVertexCount;
30    fIndexCount     = di.fIndexCount;
31
32    fInstanceCount          = di.fInstanceCount;
33    fVerticesPerInstance    = di.fVerticesPerInstance;
34    fIndicesPerInstance     = di.fIndicesPerInstance;
35
36    if (di.fDevBounds) {
37        SkASSERT(di.fDevBounds == &di.fDevBoundsStorage);
38        fDevBoundsStorage = di.fDevBoundsStorage;
39        fDevBounds = &fDevBoundsStorage;
40    } else {
41        fDevBounds = NULL;
42    }
43
44    this->setVertexBuffer(di.vertexBuffer());
45    this->setIndexBuffer(di.indexBuffer());
46
47    return *this;
48}
49
50#ifdef SK_DEBUG
51bool GrDrawTarget::DrawInfo::isInstanced() const {
52    if (fInstanceCount > 0) {
53        SkASSERT(0 == fIndexCount % fIndicesPerInstance);
54        SkASSERT(0 == fVertexCount % fVerticesPerInstance);
55        SkASSERT(fIndexCount / fIndicesPerInstance == fInstanceCount);
56        SkASSERT(fVertexCount / fVerticesPerInstance == fInstanceCount);
57        // there is no way to specify a non-zero start index to drawIndexedInstances().
58        SkASSERT(0 == fStartIndex);
59        return true;
60    } else {
61        SkASSERT(!fVerticesPerInstance);
62        SkASSERT(!fIndicesPerInstance);
63        return false;
64    }
65}
66#endif
67
68void GrDrawTarget::DrawInfo::adjustInstanceCount(int instanceOffset) {
69    SkASSERT(this->isInstanced());
70    SkASSERT(instanceOffset + fInstanceCount >= 0);
71    fInstanceCount += instanceOffset;
72    fVertexCount = fVerticesPerInstance * fInstanceCount;
73    fIndexCount = fIndicesPerInstance * fInstanceCount;
74}
75
76void GrDrawTarget::DrawInfo::adjustStartVertex(int vertexOffset) {
77    fStartVertex += vertexOffset;
78    SkASSERT(fStartVertex >= 0);
79}
80
81void GrDrawTarget::DrawInfo::adjustStartIndex(int indexOffset) {
82    SkASSERT(this->isIndexed());
83    fStartIndex += indexOffset;
84    SkASSERT(fStartIndex >= 0);
85}
86
87////////////////////////////////////////////////////////////////////////////////
88
89#define DEBUG_INVAL_BUFFER 0xdeadcafe
90#define DEBUG_INVAL_START_IDX -1
91
92GrDrawTarget::GrDrawTarget(GrContext* context)
93    : fClip(NULL)
94    , fContext(context)
95    , fGpuTraceMarkerCount(0) {
96    SkASSERT(context);
97    GeometrySrcState& geoSrc = fGeoSrcStateStack.push_back();
98#ifdef SK_DEBUG
99    geoSrc.fVertexCount = DEBUG_INVAL_START_IDX;
100    geoSrc.fVertexBuffer = (GrVertexBuffer*)DEBUG_INVAL_BUFFER;
101    geoSrc.fIndexCount = DEBUG_INVAL_START_IDX;
102    geoSrc.fIndexBuffer = (GrIndexBuffer*)DEBUG_INVAL_BUFFER;
103#endif
104    geoSrc.fVertexSrc = kNone_GeometrySrcType;
105    geoSrc.fIndexSrc  = kNone_GeometrySrcType;
106}
107
108GrDrawTarget::~GrDrawTarget() {
109    SkASSERT(1 == fGeoSrcStateStack.count());
110    SkDEBUGCODE(GeometrySrcState& geoSrc = fGeoSrcStateStack.back());
111    SkASSERT(kNone_GeometrySrcType == geoSrc.fIndexSrc);
112    SkASSERT(kNone_GeometrySrcType == geoSrc.fVertexSrc);
113}
114
115void GrDrawTarget::releaseGeometry() {
116    int popCnt = fGeoSrcStateStack.count() - 1;
117    while (popCnt) {
118        this->popGeometrySource();
119        --popCnt;
120    }
121    this->resetVertexSource();
122    this->resetIndexSource();
123}
124
125void GrDrawTarget::setClip(const GrClipData* clip) {
126    fClip = clip;
127}
128
129const GrClipData* GrDrawTarget::getClip() const {
130    return fClip;
131}
132
133bool GrDrawTarget::reserveVertexSpace(size_t vertexSize,
134                                      int vertexCount,
135                                      void** vertices) {
136    GeometrySrcState& geoSrc = fGeoSrcStateStack.back();
137    bool acquired = false;
138    if (vertexCount > 0) {
139        SkASSERT(vertices);
140        this->releasePreviousVertexSource();
141        geoSrc.fVertexSrc = kNone_GeometrySrcType;
142
143        acquired = this->onReserveVertexSpace(vertexSize,
144                                              vertexCount,
145                                              vertices);
146    }
147    if (acquired) {
148        geoSrc.fVertexSrc = kReserved_GeometrySrcType;
149        geoSrc.fVertexCount = vertexCount;
150        geoSrc.fVertexSize = vertexSize;
151    } else if (vertices) {
152        *vertices = NULL;
153    }
154    return acquired;
155}
156
157bool GrDrawTarget::reserveIndexSpace(int indexCount,
158                                     void** indices) {
159    GeometrySrcState& geoSrc = fGeoSrcStateStack.back();
160    bool acquired = false;
161    if (indexCount > 0) {
162        SkASSERT(indices);
163        this->releasePreviousIndexSource();
164        geoSrc.fIndexSrc = kNone_GeometrySrcType;
165
166        acquired = this->onReserveIndexSpace(indexCount, indices);
167    }
168    if (acquired) {
169        geoSrc.fIndexSrc = kReserved_GeometrySrcType;
170        geoSrc.fIndexCount = indexCount;
171    } else if (indices) {
172        *indices = NULL;
173    }
174    return acquired;
175
176}
177
178bool GrDrawTarget::reserveVertexAndIndexSpace(int vertexCount,
179                                              size_t vertexStride,
180                                              int indexCount,
181                                              void** vertices,
182                                              void** indices) {
183    this->willReserveVertexAndIndexSpace(vertexCount, vertexStride, indexCount);
184    if (vertexCount) {
185        if (!this->reserveVertexSpace(vertexStride, vertexCount, vertices)) {
186            if (indexCount) {
187                this->resetIndexSource();
188            }
189            return false;
190        }
191    }
192    if (indexCount) {
193        if (!this->reserveIndexSpace(indexCount, indices)) {
194            if (vertexCount) {
195                this->resetVertexSource();
196            }
197            return false;
198        }
199    }
200    return true;
201}
202
203bool GrDrawTarget::geometryHints(size_t vertexStride,
204                                 int32_t* vertexCount,
205                                 int32_t* indexCount) const {
206    if (vertexCount) {
207        *vertexCount = -1;
208    }
209    if (indexCount) {
210        *indexCount = -1;
211    }
212    return false;
213}
214
215void GrDrawTarget::releasePreviousVertexSource() {
216    GeometrySrcState& geoSrc = fGeoSrcStateStack.back();
217    switch (geoSrc.fVertexSrc) {
218        case kNone_GeometrySrcType:
219            break;
220        case kReserved_GeometrySrcType:
221            this->releaseReservedVertexSpace();
222            break;
223        case kBuffer_GeometrySrcType:
224            geoSrc.fVertexBuffer->unref();
225#ifdef SK_DEBUG
226            geoSrc.fVertexBuffer = (GrVertexBuffer*)DEBUG_INVAL_BUFFER;
227#endif
228            break;
229        default:
230            SkFAIL("Unknown Vertex Source Type.");
231            break;
232    }
233}
234
235void GrDrawTarget::releasePreviousIndexSource() {
236    GeometrySrcState& geoSrc = fGeoSrcStateStack.back();
237    switch (geoSrc.fIndexSrc) {
238        case kNone_GeometrySrcType:   // these two don't require
239            break;
240        case kReserved_GeometrySrcType:
241            this->releaseReservedIndexSpace();
242            break;
243        case kBuffer_GeometrySrcType:
244            geoSrc.fIndexBuffer->unref();
245#ifdef SK_DEBUG
246            geoSrc.fIndexBuffer = (GrIndexBuffer*)DEBUG_INVAL_BUFFER;
247#endif
248            break;
249        default:
250            SkFAIL("Unknown Index Source Type.");
251            break;
252    }
253}
254
255void GrDrawTarget::setVertexSourceToBuffer(const GrVertexBuffer* buffer, size_t vertexStride) {
256    this->releasePreviousVertexSource();
257    GeometrySrcState& geoSrc = fGeoSrcStateStack.back();
258    geoSrc.fVertexSrc    = kBuffer_GeometrySrcType;
259    geoSrc.fVertexBuffer = buffer;
260    buffer->ref();
261    geoSrc.fVertexSize = vertexStride;
262}
263
264void GrDrawTarget::setIndexSourceToBuffer(const GrIndexBuffer* buffer) {
265    this->releasePreviousIndexSource();
266    GeometrySrcState& geoSrc = fGeoSrcStateStack.back();
267    geoSrc.fIndexSrc     = kBuffer_GeometrySrcType;
268    geoSrc.fIndexBuffer  = buffer;
269    buffer->ref();
270}
271
272void GrDrawTarget::resetVertexSource() {
273    this->releasePreviousVertexSource();
274    GeometrySrcState& geoSrc = fGeoSrcStateStack.back();
275    geoSrc.fVertexSrc = kNone_GeometrySrcType;
276}
277
278void GrDrawTarget::resetIndexSource() {
279    this->releasePreviousIndexSource();
280    GeometrySrcState& geoSrc = fGeoSrcStateStack.back();
281    geoSrc.fIndexSrc = kNone_GeometrySrcType;
282}
283
284void GrDrawTarget::pushGeometrySource() {
285    this->geometrySourceWillPush();
286    GeometrySrcState& newState = fGeoSrcStateStack.push_back();
287    newState.fIndexSrc = kNone_GeometrySrcType;
288    newState.fVertexSrc = kNone_GeometrySrcType;
289#ifdef SK_DEBUG
290    newState.fVertexCount  = ~0;
291    newState.fVertexBuffer = (GrVertexBuffer*)~0;
292    newState.fIndexCount   = ~0;
293    newState.fIndexBuffer = (GrIndexBuffer*)~0;
294#endif
295}
296
297void GrDrawTarget::popGeometrySource() {
298    // if popping last element then pops are unbalanced with pushes
299    SkASSERT(fGeoSrcStateStack.count() > 1);
300
301    this->geometrySourceWillPop(fGeoSrcStateStack.fromBack(1));
302    this->releasePreviousVertexSource();
303    this->releasePreviousIndexSource();
304    fGeoSrcStateStack.pop_back();
305}
306
307////////////////////////////////////////////////////////////////////////////////
308
309bool GrDrawTarget::checkDraw(const GrDrawState& drawState,
310                             GrPrimitiveType type,
311                             int startVertex,
312                             int startIndex,
313                             int vertexCount,
314                             int indexCount) const {
315#ifdef SK_DEBUG
316    const GeometrySrcState& geoSrc = fGeoSrcStateStack.back();
317    int maxVertex = startVertex + vertexCount;
318    int maxValidVertex;
319    switch (geoSrc.fVertexSrc) {
320        case kNone_GeometrySrcType:
321            SkFAIL("Attempting to draw without vertex src.");
322        case kReserved_GeometrySrcType: // fallthrough
323            maxValidVertex = geoSrc.fVertexCount;
324            break;
325        case kBuffer_GeometrySrcType:
326            maxValidVertex = static_cast<int>(geoSrc.fVertexBuffer->gpuMemorySize() / geoSrc.fVertexSize);
327            break;
328    }
329    if (maxVertex > maxValidVertex) {
330        SkFAIL("Drawing outside valid vertex range.");
331    }
332    if (indexCount > 0) {
333        int maxIndex = startIndex + indexCount;
334        int maxValidIndex;
335        switch (geoSrc.fIndexSrc) {
336            case kNone_GeometrySrcType:
337                SkFAIL("Attempting to draw indexed geom without index src.");
338            case kReserved_GeometrySrcType: // fallthrough
339                maxValidIndex = geoSrc.fIndexCount;
340                break;
341            case kBuffer_GeometrySrcType:
342                maxValidIndex = static_cast<int>(geoSrc.fIndexBuffer->gpuMemorySize() / sizeof(uint16_t));
343                break;
344        }
345        if (maxIndex > maxValidIndex) {
346            SkFAIL("Index reads outside valid index range.");
347        }
348    }
349
350    SkASSERT(drawState.getRenderTarget());
351
352    if (drawState.hasGeometryProcessor()) {
353        const GrGeometryProcessor* gp = drawState.getGeometryProcessor();
354        int numTextures = gp->numTextures();
355        for (int t = 0; t < numTextures; ++t) {
356            GrTexture* texture = gp->texture(t);
357            SkASSERT(texture->asRenderTarget() != drawState.getRenderTarget());
358        }
359    }
360
361    for (int s = 0; s < drawState.numColorStages(); ++s) {
362        const GrProcessor* effect = drawState.getColorStage(s).getProcessor();
363        int numTextures = effect->numTextures();
364        for (int t = 0; t < numTextures; ++t) {
365            GrTexture* texture = effect->texture(t);
366            SkASSERT(texture->asRenderTarget() != drawState.getRenderTarget());
367        }
368    }
369    for (int s = 0; s < drawState.numCoverageStages(); ++s) {
370        const GrProcessor* effect = drawState.getCoverageStage(s).getProcessor();
371        int numTextures = effect->numTextures();
372        for (int t = 0; t < numTextures; ++t) {
373            GrTexture* texture = effect->texture(t);
374            SkASSERT(texture->asRenderTarget() != drawState.getRenderTarget());
375        }
376    }
377
378    SkASSERT(drawState.validateVertexAttribs());
379#endif
380    if (NULL == drawState.getRenderTarget()) {
381        return false;
382    }
383    return true;
384}
385
386bool GrDrawTarget::setupDstReadIfNecessary(GrDrawState* ds,
387                                           GrDeviceCoordTexture* dstCopy,
388                                           const SkRect* drawBounds) {
389    if (this->caps()->dstReadInShaderSupport() || !ds->willEffectReadDstColor()) {
390        return true;
391    }
392    SkIRect copyRect;
393    const GrClipData* clip = this->getClip();
394    GrRenderTarget* rt = ds->getRenderTarget();
395    clip->getConservativeBounds(rt, &copyRect);
396
397    if (drawBounds) {
398        SkIRect drawIBounds;
399        drawBounds->roundOut(&drawIBounds);
400        if (!copyRect.intersect(drawIBounds)) {
401#ifdef SK_DEBUG
402            SkDebugf("Missed an early reject. Bailing on draw from setupDstReadIfNecessary.\n");
403#endif
404            return false;
405        }
406    } else {
407#ifdef SK_DEBUG
408        //SkDebugf("No dev bounds when dst copy is made.\n");
409#endif
410    }
411
412    // MSAA consideration: When there is support for reading MSAA samples in the shader we could
413    // have per-sample dst values by making the copy multisampled.
414    GrSurfaceDesc desc;
415    this->initCopySurfaceDstDesc(rt, &desc);
416    desc.fWidth = copyRect.width();
417    desc.fHeight = copyRect.height();
418
419    SkAutoTUnref<GrTexture> copy(
420        fContext->refScratchTexture(desc, GrContext::kApprox_ScratchTexMatch));
421
422    if (!copy) {
423        SkDebugf("Failed to create temporary copy of destination texture.\n");
424        return false;
425    }
426    SkIPoint dstPoint = {0, 0};
427    if (this->copySurface(copy, rt, copyRect, dstPoint)) {
428        dstCopy->setTexture(copy);
429        dstCopy->setOffset(copyRect.fLeft, copyRect.fTop);
430        return true;
431    } else {
432        return false;
433    }
434}
435
436void GrDrawTarget::drawIndexed(GrDrawState* ds,
437                               GrPrimitiveType type,
438                               int startVertex,
439                               int startIndex,
440                               int vertexCount,
441                               int indexCount,
442                               const SkRect* devBounds) {
443    SkASSERT(ds);
444    if (indexCount > 0 &&
445        this->checkDraw(*ds, type, startVertex, startIndex, vertexCount, indexCount)) {
446
447        // Setup clip
448        GrClipMaskManager::ScissorState scissorState;
449        GrDrawState::AutoRestoreEffects are;
450        GrDrawState::AutoRestoreStencil ars;
451        if (!this->setupClip(devBounds, &are, &ars, ds, &scissorState)) {
452            return;
453        }
454
455        DrawInfo info;
456        info.fPrimitiveType = type;
457        info.fStartVertex   = startVertex;
458        info.fStartIndex    = startIndex;
459        info.fVertexCount   = vertexCount;
460        info.fIndexCount    = indexCount;
461
462        info.fInstanceCount         = 0;
463        info.fVerticesPerInstance   = 0;
464        info.fIndicesPerInstance    = 0;
465
466        if (devBounds) {
467            info.setDevBounds(*devBounds);
468        }
469
470        // TODO: We should continue with incorrect blending.
471        GrDeviceCoordTexture dstCopy;
472        if (!this->setupDstReadIfNecessary(ds, &dstCopy, devBounds)) {
473            return;
474        }
475        this->setDrawBuffers(&info);
476
477        this->onDraw(*ds, info, scissorState, dstCopy.texture() ? &dstCopy : NULL);
478    }
479}
480
481void GrDrawTarget::drawNonIndexed(GrDrawState* ds,
482                                  GrPrimitiveType type,
483                                  int startVertex,
484                                  int vertexCount,
485                                  const SkRect* devBounds) {
486    SkASSERT(ds);
487    if (vertexCount > 0 && this->checkDraw(*ds, type, startVertex, -1, vertexCount, -1)) {
488
489        // Setup clip
490        GrClipMaskManager::ScissorState scissorState;
491        GrDrawState::AutoRestoreEffects are;
492        GrDrawState::AutoRestoreStencil ars;
493        if (!this->setupClip(devBounds, &are, &ars, ds, &scissorState)) {
494            return;
495        }
496
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 (devBounds) {
509            info.setDevBounds(*devBounds);
510        }
511
512        // TODO: We should continue with incorrect blending.
513        GrDeviceCoordTexture dstCopy;
514        if (!this->setupDstReadIfNecessary(ds, &dstCopy, devBounds)) {
515            return;
516        }
517
518        this->setDrawBuffers(&info);
519
520        this->onDraw(*ds, info, scissorState, dstCopy.texture() ? &dstCopy : NULL);
521    }
522}
523
524static const GrStencilSettings& winding_path_stencil_settings() {
525    GR_STATIC_CONST_SAME_STENCIL_STRUCT(gSettings,
526        kIncClamp_StencilOp,
527        kIncClamp_StencilOp,
528        kAlwaysIfInClip_StencilFunc,
529        0xFFFF, 0xFFFF, 0xFFFF);
530    return *GR_CONST_STENCIL_SETTINGS_PTR_FROM_STRUCT_PTR(&gSettings);
531}
532
533static const GrStencilSettings& even_odd_path_stencil_settings() {
534    GR_STATIC_CONST_SAME_STENCIL_STRUCT(gSettings,
535        kInvert_StencilOp,
536        kInvert_StencilOp,
537        kAlwaysIfInClip_StencilFunc,
538        0xFFFF, 0xFFFF, 0xFFFF);
539    return *GR_CONST_STENCIL_SETTINGS_PTR_FROM_STRUCT_PTR(&gSettings);
540}
541
542void GrDrawTarget::getPathStencilSettingsForFilltype(GrPathRendering::FillType fill,
543                                                     const GrStencilBuffer* sb,
544                                                     GrStencilSettings* outStencilSettings) {
545
546    switch (fill) {
547        default:
548            SkFAIL("Unexpected path fill.");
549        case GrPathRendering::kWinding_FillType:
550            *outStencilSettings = winding_path_stencil_settings();
551            break;
552        case GrPathRendering::kEvenOdd_FillType:
553            *outStencilSettings = even_odd_path_stencil_settings();
554            break;
555    }
556    this->clipMaskManager()->adjustPathStencilParams(sb, outStencilSettings);
557}
558
559void GrDrawTarget::stencilPath(GrDrawState* ds,
560                               const GrPath* path,
561                               GrPathRendering::FillType fill) {
562    // TODO: extract portions of checkDraw that are relevant to path stenciling.
563    SkASSERT(path);
564    SkASSERT(this->caps()->pathRenderingSupport());
565    SkASSERT(ds);
566
567    // Setup clip
568    GrClipMaskManager::ScissorState scissorState;
569    GrDrawState::AutoRestoreEffects are;
570    GrDrawState::AutoRestoreStencil ars;
571    if (!this->setupClip(NULL, &are, &ars, ds, &scissorState)) {
572        return;
573    }
574
575    // set stencil settings for path
576    GrStencilSettings stencilSettings;
577    this->getPathStencilSettingsForFilltype(fill,
578                                            ds->getRenderTarget()->getStencilBuffer(),
579                                            &stencilSettings);
580
581    this->onStencilPath(*ds, path, scissorState, stencilSettings);
582}
583
584void GrDrawTarget::drawPath(GrDrawState* ds,
585                            const GrPath* path,
586                            GrPathRendering::FillType fill) {
587    // TODO: extract portions of checkDraw that are relevant to path rendering.
588    SkASSERT(path);
589    SkASSERT(this->caps()->pathRenderingSupport());
590    SkASSERT(ds);
591
592    SkRect devBounds = path->getBounds();
593    SkMatrix viewM = ds->getViewMatrix();
594    viewM.mapRect(&devBounds);
595
596    // Setup clip
597    GrClipMaskManager::ScissorState scissorState;
598    GrDrawState::AutoRestoreEffects are;
599    GrDrawState::AutoRestoreStencil ars;
600    if (!this->setupClip(&devBounds, &are, &ars, ds, &scissorState)) {
601       return;
602    }
603
604    // set stencil settings for path
605    GrStencilSettings stencilSettings;
606    this->getPathStencilSettingsForFilltype(fill,
607                                            ds->getRenderTarget()->getStencilBuffer(),
608                                            &stencilSettings);
609
610    GrDeviceCoordTexture dstCopy;
611    if (!this->setupDstReadIfNecessary(ds, &dstCopy, &devBounds)) {
612        return;
613    }
614
615    this->onDrawPath(*ds, path, scissorState, stencilSettings, dstCopy.texture() ? &dstCopy : NULL);
616}
617
618void GrDrawTarget::drawPaths(GrDrawState* ds,
619                             const GrPathRange* pathRange,
620                             const uint32_t indices[],
621                             int count,
622                             const float transforms[],
623                             PathTransformType transformsType,
624                             GrPathRendering::FillType fill) {
625    SkASSERT(this->caps()->pathRenderingSupport());
626    SkASSERT(pathRange);
627    SkASSERT(indices);
628    SkASSERT(transforms);
629    SkASSERT(ds);
630
631    // Setup clip
632    GrClipMaskManager::ScissorState scissorState;
633    GrDrawState::AutoRestoreEffects are;
634    GrDrawState::AutoRestoreStencil ars;
635
636    if (!this->setupClip(NULL, &are, &ars, ds, &scissorState)) {
637        return;
638    }
639
640    // set stencil settings for path
641    GrStencilSettings stencilSettings;
642    this->getPathStencilSettingsForFilltype(fill,
643                                            ds->getRenderTarget()->getStencilBuffer(),
644                                            &stencilSettings);
645
646    // Don't compute a bounding box for setupDstReadIfNecessary(), we'll opt
647    // instead for it to just copy the entire dst. Realistically this is a moot
648    // point, because any context that supports NV_path_rendering will also
649    // support NV_blend_equation_advanced.
650    GrDeviceCoordTexture dstCopy;
651    if (!this->setupDstReadIfNecessary(ds, &dstCopy, NULL)) {
652        return;
653    }
654
655    this->onDrawPaths(*ds, pathRange, indices, count, transforms, transformsType, scissorState,
656                      stencilSettings, dstCopy.texture() ? &dstCopy : NULL);
657}
658
659void GrDrawTarget::clear(const SkIRect* rect,
660                         GrColor color,
661                         bool canIgnoreRect,
662                         GrRenderTarget* renderTarget) {
663    if (fCaps->useDrawInsteadOfClear()) {
664        // This works around a driver bug with clear by drawing a rect instead.
665        // The driver will ignore a clear if it is the only thing rendered to a
666        // target before the target is read.
667        SkIRect rtRect = SkIRect::MakeWH(renderTarget->width(), renderTarget->height());
668        if (NULL == rect || canIgnoreRect || rect->contains(rtRect)) {
669            rect = &rtRect;
670            // We first issue a discard() since that may help tilers.
671            this->discard(renderTarget);
672        }
673
674        GrDrawState drawState;
675
676        drawState.setColor(color);
677        drawState.setRenderTarget(renderTarget);
678
679        this->drawSimpleRect(&drawState, *rect);
680    } else {
681        this->onClear(rect, color, canIgnoreRect, renderTarget);
682    }
683}
684
685typedef GrTraceMarkerSet::Iter TMIter;
686void GrDrawTarget::saveActiveTraceMarkers() {
687    if (this->caps()->gpuTracingSupport()) {
688        SkASSERT(0 == fStoredTraceMarkers.count());
689        fStoredTraceMarkers.addSet(fActiveTraceMarkers);
690        for (TMIter iter = fStoredTraceMarkers.begin(); iter != fStoredTraceMarkers.end(); ++iter) {
691            this->removeGpuTraceMarker(&(*iter));
692        }
693    }
694}
695
696void GrDrawTarget::restoreActiveTraceMarkers() {
697    if (this->caps()->gpuTracingSupport()) {
698        SkASSERT(0 == fActiveTraceMarkers.count());
699        for (TMIter iter = fStoredTraceMarkers.begin(); iter != fStoredTraceMarkers.end(); ++iter) {
700            this->addGpuTraceMarker(&(*iter));
701        }
702        for (TMIter iter = fActiveTraceMarkers.begin(); iter != fActiveTraceMarkers.end(); ++iter) {
703            this->fStoredTraceMarkers.remove(*iter);
704        }
705    }
706}
707
708void GrDrawTarget::addGpuTraceMarker(const GrGpuTraceMarker* marker) {
709    if (this->caps()->gpuTracingSupport()) {
710        SkASSERT(fGpuTraceMarkerCount >= 0);
711        this->fActiveTraceMarkers.add(*marker);
712        ++fGpuTraceMarkerCount;
713    }
714}
715
716void GrDrawTarget::removeGpuTraceMarker(const GrGpuTraceMarker* marker) {
717    if (this->caps()->gpuTracingSupport()) {
718        SkASSERT(fGpuTraceMarkerCount >= 1);
719        this->fActiveTraceMarkers.remove(*marker);
720        --fGpuTraceMarkerCount;
721    }
722}
723
724////////////////////////////////////////////////////////////////////////////////
725
726void GrDrawTarget::drawIndexedInstances(GrDrawState* ds,
727                                        GrPrimitiveType type,
728                                        int instanceCount,
729                                        int verticesPerInstance,
730                                        int indicesPerInstance,
731                                        const SkRect* devBounds) {
732    SkASSERT(ds);
733
734    if (!verticesPerInstance || !indicesPerInstance) {
735        return;
736    }
737
738    int maxInstancesPerDraw = this->indexCountInCurrentSource() / indicesPerInstance;
739    if (!maxInstancesPerDraw) {
740        return;
741    }
742
743    // Setup clip
744    GrClipMaskManager::ScissorState scissorState;
745    GrDrawState::AutoRestoreEffects are;
746    GrDrawState::AutoRestoreStencil ars;
747    if (!this->setupClip(devBounds, &are, &ars, ds, &scissorState)) {
748        return;
749    }
750
751    DrawInfo info;
752    info.fPrimitiveType = type;
753    info.fStartIndex = 0;
754    info.fStartVertex = 0;
755    info.fIndicesPerInstance = indicesPerInstance;
756    info.fVerticesPerInstance = verticesPerInstance;
757
758    // Set the same bounds for all the draws.
759    if (devBounds) {
760        info.setDevBounds(*devBounds);
761    }
762
763    // TODO: We should continue with incorrect blending.
764    GrDeviceCoordTexture dstCopy;
765    if (!this->setupDstReadIfNecessary(ds, &dstCopy, devBounds)) {
766        return;
767    }
768
769    while (instanceCount) {
770        info.fInstanceCount = SkTMin(instanceCount, maxInstancesPerDraw);
771        info.fVertexCount = info.fInstanceCount * verticesPerInstance;
772        info.fIndexCount = info.fInstanceCount * indicesPerInstance;
773
774        this->setDrawBuffers(&info);
775
776        if (this->checkDraw(*ds,
777                            type,
778                            info.fStartVertex,
779                            info.fStartIndex,
780                            info.fVertexCount,
781                            info.fIndexCount)) {
782            this->onDraw(*ds, info, scissorState, dstCopy.texture() ? &dstCopy : NULL);
783        }
784        info.fStartVertex += info.fVertexCount;
785        instanceCount -= info.fInstanceCount;
786    }
787}
788
789////////////////////////////////////////////////////////////////////////////////
790
791GrDrawTarget::AutoReleaseGeometry::AutoReleaseGeometry(
792                                         GrDrawTarget*  target,
793                                         int vertexCount,
794                                         size_t vertexStride,
795                                         int indexCount) {
796    fTarget = NULL;
797    this->set(target, vertexCount, vertexStride, indexCount);
798}
799
800GrDrawTarget::AutoReleaseGeometry::AutoReleaseGeometry() {
801    fTarget = NULL;
802}
803
804GrDrawTarget::AutoReleaseGeometry::~AutoReleaseGeometry() {
805    this->reset();
806}
807
808bool GrDrawTarget::AutoReleaseGeometry::set(GrDrawTarget*  target,
809                                            int vertexCount,
810                                            size_t vertexStride,
811                                            int indexCount) {
812    this->reset();
813    fTarget = target;
814    bool success = true;
815    if (fTarget) {
816        success = target->reserveVertexAndIndexSpace(vertexCount,
817                                                     vertexStride,
818                                                     indexCount,
819                                                     &fVertices,
820                                                     &fIndices);
821        if (!success) {
822            fTarget = NULL;
823            this->reset();
824        }
825    }
826    SkASSERT(success == SkToBool(fTarget));
827    return success;
828}
829
830void GrDrawTarget::AutoReleaseGeometry::reset() {
831    if (fTarget) {
832        if (fVertices) {
833            fTarget->resetVertexSource();
834        }
835        if (fIndices) {
836            fTarget->resetIndexSource();
837        }
838        fTarget = NULL;
839    }
840    fVertices = NULL;
841    fIndices = NULL;
842}
843
844GrDrawTarget::AutoClipRestore::AutoClipRestore(GrDrawTarget* target, const SkIRect& newClip) {
845    fTarget = target;
846    fClip = fTarget->getClip();
847    fStack.init();
848    fStack.get()->clipDevRect(newClip, SkRegion::kReplace_Op);
849    fReplacementClip.fClipStack = fStack.get();
850    target->setClip(&fReplacementClip);
851}
852
853namespace {
854// returns true if the read/written rect intersects the src/dst and false if not.
855bool clip_srcrect_and_dstpoint(const GrSurface* dst,
856                               const GrSurface* src,
857                               const SkIRect& srcRect,
858                               const SkIPoint& dstPoint,
859                               SkIRect* clippedSrcRect,
860                               SkIPoint* clippedDstPoint) {
861    *clippedSrcRect = srcRect;
862    *clippedDstPoint = dstPoint;
863
864    // clip the left edge to src and dst bounds, adjusting dstPoint if necessary
865    if (clippedSrcRect->fLeft < 0) {
866        clippedDstPoint->fX -= clippedSrcRect->fLeft;
867        clippedSrcRect->fLeft = 0;
868    }
869    if (clippedDstPoint->fX < 0) {
870        clippedSrcRect->fLeft -= clippedDstPoint->fX;
871        clippedDstPoint->fX = 0;
872    }
873
874    // clip the top edge to src and dst bounds, adjusting dstPoint if necessary
875    if (clippedSrcRect->fTop < 0) {
876        clippedDstPoint->fY -= clippedSrcRect->fTop;
877        clippedSrcRect->fTop = 0;
878    }
879    if (clippedDstPoint->fY < 0) {
880        clippedSrcRect->fTop -= clippedDstPoint->fY;
881        clippedDstPoint->fY = 0;
882    }
883
884    // clip the right edge to the src and dst bounds.
885    if (clippedSrcRect->fRight > src->width()) {
886        clippedSrcRect->fRight = src->width();
887    }
888    if (clippedDstPoint->fX + clippedSrcRect->width() > dst->width()) {
889        clippedSrcRect->fRight = clippedSrcRect->fLeft + dst->width() - clippedDstPoint->fX;
890    }
891
892    // clip the bottom edge to the src and dst bounds.
893    if (clippedSrcRect->fBottom > src->height()) {
894        clippedSrcRect->fBottom = src->height();
895    }
896    if (clippedDstPoint->fY + clippedSrcRect->height() > dst->height()) {
897        clippedSrcRect->fBottom = clippedSrcRect->fTop + dst->height() - clippedDstPoint->fY;
898    }
899
900    // The above clipping steps may have inverted the rect if it didn't intersect either the src or
901    // dst bounds.
902    return !clippedSrcRect->isEmpty();
903}
904}
905
906bool GrDrawTarget::copySurface(GrSurface* dst,
907                               GrSurface* src,
908                               const SkIRect& srcRect,
909                               const SkIPoint& dstPoint) {
910    SkASSERT(dst);
911    SkASSERT(src);
912
913    SkIRect clippedSrcRect;
914    SkIPoint clippedDstPoint;
915    // If the rect is outside the src or dst then we've already succeeded.
916    if (!clip_srcrect_and_dstpoint(dst,
917                                   src,
918                                   srcRect,
919                                   dstPoint,
920                                   &clippedSrcRect,
921                                   &clippedDstPoint)) {
922        SkASSERT(GrDrawTarget::canCopySurface(dst, src, srcRect, dstPoint));
923        return true;
924    }
925
926    if (!GrDrawTarget::canCopySurface(dst, src, clippedSrcRect, clippedDstPoint)) {
927        return false;
928    }
929
930    GrRenderTarget* rt = dst->asRenderTarget();
931    GrTexture* tex = src->asTexture();
932
933    GrDrawState drawState;
934    drawState.setRenderTarget(rt);
935    SkMatrix matrix;
936    matrix.setTranslate(SkIntToScalar(clippedSrcRect.fLeft - clippedDstPoint.fX),
937                        SkIntToScalar(clippedSrcRect.fTop - clippedDstPoint.fY));
938    matrix.postIDiv(tex->width(), tex->height());
939    drawState.addColorTextureProcessor(tex, matrix);
940    SkIRect dstRect = SkIRect::MakeXYWH(clippedDstPoint.fX,
941                                        clippedDstPoint.fY,
942                                        clippedSrcRect.width(),
943                                        clippedSrcRect.height());
944    this->drawSimpleRect(&drawState, dstRect);
945    return true;
946}
947
948bool GrDrawTarget::canCopySurface(const GrSurface* dst,
949                                  const GrSurface* src,
950                                  const SkIRect& srcRect,
951                                  const SkIPoint& dstPoint) {
952    SkASSERT(dst);
953    SkASSERT(src);
954
955    SkIRect clippedSrcRect;
956    SkIPoint clippedDstPoint;
957    // If the rect is outside the src or dst then we're guaranteed success
958    if (!clip_srcrect_and_dstpoint(dst,
959                                   src,
960                                   srcRect,
961                                   dstPoint,
962                                   &clippedSrcRect,
963                                   &clippedDstPoint)) {
964        return true;
965    }
966
967    // Check that the read/write rects are contained within the src/dst bounds.
968    SkASSERT(!clippedSrcRect.isEmpty());
969    SkASSERT(SkIRect::MakeWH(src->width(), src->height()).contains(clippedSrcRect));
970    SkASSERT(clippedDstPoint.fX >= 0 && clippedDstPoint.fY >= 0);
971    SkASSERT(clippedDstPoint.fX + clippedSrcRect.width() <= dst->width() &&
972             clippedDstPoint.fY + clippedSrcRect.height() <= dst->height());
973
974    return (dst != src) && dst->asRenderTarget() && src->asTexture();
975}
976
977void GrDrawTarget::initCopySurfaceDstDesc(const GrSurface* src, GrSurfaceDesc* desc) {
978    // Make the dst of the copy be a render target because the default copySurface draws to the dst.
979    desc->fOrigin = kDefault_GrSurfaceOrigin;
980    desc->fFlags = kRenderTarget_GrSurfaceFlag | kNoStencil_GrSurfaceFlag;
981    desc->fConfig = src->config();
982}
983
984///////////////////////////////////////////////////////////////////////////////
985
986void GrDrawTargetCaps::reset() {
987    fMipMapSupport = false;
988    fNPOTTextureTileSupport = false;
989    fTwoSidedStencilSupport = false;
990    fStencilWrapOpsSupport = false;
991    fHWAALineSupport = false;
992    fShaderDerivativeSupport = false;
993    fGeometryShaderSupport = false;
994    fDualSourceBlendingSupport = false;
995    fPathRenderingSupport = false;
996    fDstReadInShaderSupport = false;
997    fDiscardRenderTargetSupport = false;
998    fReuseScratchTextures = true;
999    fGpuTracingSupport = false;
1000    fCompressedTexSubImageSupport = false;
1001
1002    fUseDrawInsteadOfClear = false;
1003
1004    fMapBufferFlags = kNone_MapFlags;
1005
1006    fMaxRenderTargetSize = 0;
1007    fMaxTextureSize = 0;
1008    fMaxSampleCount = 0;
1009
1010    memset(fConfigRenderSupport, 0, sizeof(fConfigRenderSupport));
1011    memset(fConfigTextureSupport, 0, sizeof(fConfigTextureSupport));
1012}
1013
1014GrDrawTargetCaps& GrDrawTargetCaps::operator=(const GrDrawTargetCaps& other) {
1015    fMipMapSupport = other.fMipMapSupport;
1016    fNPOTTextureTileSupport = other.fNPOTTextureTileSupport;
1017    fTwoSidedStencilSupport = other.fTwoSidedStencilSupport;
1018    fStencilWrapOpsSupport = other.fStencilWrapOpsSupport;
1019    fHWAALineSupport = other.fHWAALineSupport;
1020    fShaderDerivativeSupport = other.fShaderDerivativeSupport;
1021    fGeometryShaderSupport = other.fGeometryShaderSupport;
1022    fDualSourceBlendingSupport = other.fDualSourceBlendingSupport;
1023    fPathRenderingSupport = other.fPathRenderingSupport;
1024    fDstReadInShaderSupport = other.fDstReadInShaderSupport;
1025    fDiscardRenderTargetSupport = other.fDiscardRenderTargetSupport;
1026    fReuseScratchTextures = other.fReuseScratchTextures;
1027    fGpuTracingSupport = other.fGpuTracingSupport;
1028    fCompressedTexSubImageSupport = other.fCompressedTexSubImageSupport;
1029
1030    fUseDrawInsteadOfClear = other.fUseDrawInsteadOfClear;
1031
1032    fMapBufferFlags = other.fMapBufferFlags;
1033
1034    fMaxRenderTargetSize = other.fMaxRenderTargetSize;
1035    fMaxTextureSize = other.fMaxTextureSize;
1036    fMaxSampleCount = other.fMaxSampleCount;
1037
1038    memcpy(fConfigRenderSupport, other.fConfigRenderSupport, sizeof(fConfigRenderSupport));
1039    memcpy(fConfigTextureSupport, other.fConfigTextureSupport, sizeof(fConfigTextureSupport));
1040
1041    return *this;
1042}
1043
1044static SkString map_flags_to_string(uint32_t flags) {
1045    SkString str;
1046    if (GrDrawTargetCaps::kNone_MapFlags == flags) {
1047        str = "none";
1048    } else {
1049        SkASSERT(GrDrawTargetCaps::kCanMap_MapFlag & flags);
1050        SkDEBUGCODE(flags &= ~GrDrawTargetCaps::kCanMap_MapFlag);
1051        str = "can_map";
1052
1053        if (GrDrawTargetCaps::kSubset_MapFlag & flags) {
1054            str.append(" partial");
1055        } else {
1056            str.append(" full");
1057        }
1058        SkDEBUGCODE(flags &= ~GrDrawTargetCaps::kSubset_MapFlag);
1059    }
1060    SkASSERT(0 == flags); // Make sure we handled all the flags.
1061    return str;
1062}
1063
1064SkString GrDrawTargetCaps::dump() const {
1065    SkString r;
1066    static const char* gNY[] = {"NO", "YES"};
1067    r.appendf("MIP Map Support                    : %s\n", gNY[fMipMapSupport]);
1068    r.appendf("NPOT Texture Tile Support          : %s\n", gNY[fNPOTTextureTileSupport]);
1069    r.appendf("Two Sided Stencil Support          : %s\n", gNY[fTwoSidedStencilSupport]);
1070    r.appendf("Stencil Wrap Ops  Support          : %s\n", gNY[fStencilWrapOpsSupport]);
1071    r.appendf("HW AA Lines Support                : %s\n", gNY[fHWAALineSupport]);
1072    r.appendf("Shader Derivative Support          : %s\n", gNY[fShaderDerivativeSupport]);
1073    r.appendf("Geometry Shader Support            : %s\n", gNY[fGeometryShaderSupport]);
1074    r.appendf("Dual Source Blending Support       : %s\n", gNY[fDualSourceBlendingSupport]);
1075    r.appendf("Path Rendering Support             : %s\n", gNY[fPathRenderingSupport]);
1076    r.appendf("Dst Read In Shader Support         : %s\n", gNY[fDstReadInShaderSupport]);
1077    r.appendf("Discard Render Target Support      : %s\n", gNY[fDiscardRenderTargetSupport]);
1078    r.appendf("Reuse Scratch Textures             : %s\n", gNY[fReuseScratchTextures]);
1079    r.appendf("Gpu Tracing Support                : %s\n", gNY[fGpuTracingSupport]);
1080    r.appendf("Compressed Update Support          : %s\n", gNY[fCompressedTexSubImageSupport]);
1081
1082    r.appendf("Draw Instead of Clear [workaround] : %s\n", gNY[fUseDrawInsteadOfClear]);
1083
1084    r.appendf("Max Texture Size                   : %d\n", fMaxTextureSize);
1085    r.appendf("Max Render Target Size             : %d\n", fMaxRenderTargetSize);
1086    r.appendf("Max Sample Count                   : %d\n", fMaxSampleCount);
1087
1088    r.appendf("Map Buffer Support                 : %s\n",
1089              map_flags_to_string(fMapBufferFlags).c_str());
1090
1091    static const char* kConfigNames[] = {
1092        "Unknown",  // kUnknown_GrPixelConfig
1093        "Alpha8",   // kAlpha_8_GrPixelConfig,
1094        "Index8",   // kIndex_8_GrPixelConfig,
1095        "RGB565",   // kRGB_565_GrPixelConfig,
1096        "RGBA444",  // kRGBA_4444_GrPixelConfig,
1097        "RGBA8888", // kRGBA_8888_GrPixelConfig,
1098        "BGRA8888", // kBGRA_8888_GrPixelConfig,
1099        "ETC1",     // kETC1_GrPixelConfig,
1100        "LATC",     // kLATC_GrPixelConfig,
1101        "R11EAC",   // kR11_EAC_GrPixelConfig,
1102        "ASTC12x12",// kASTC_12x12_GrPixelConfig,
1103        "RGBAFloat",  // kRGBA_float_GrPixelConfig
1104    };
1105    GR_STATIC_ASSERT(0  == kUnknown_GrPixelConfig);
1106    GR_STATIC_ASSERT(1  == kAlpha_8_GrPixelConfig);
1107    GR_STATIC_ASSERT(2  == kIndex_8_GrPixelConfig);
1108    GR_STATIC_ASSERT(3  == kRGB_565_GrPixelConfig);
1109    GR_STATIC_ASSERT(4  == kRGBA_4444_GrPixelConfig);
1110    GR_STATIC_ASSERT(5  == kRGBA_8888_GrPixelConfig);
1111    GR_STATIC_ASSERT(6  == kBGRA_8888_GrPixelConfig);
1112    GR_STATIC_ASSERT(7  == kETC1_GrPixelConfig);
1113    GR_STATIC_ASSERT(8  == kLATC_GrPixelConfig);
1114    GR_STATIC_ASSERT(9  == kR11_EAC_GrPixelConfig);
1115    GR_STATIC_ASSERT(10 == kASTC_12x12_GrPixelConfig);
1116    GR_STATIC_ASSERT(11 == kRGBA_float_GrPixelConfig);
1117    GR_STATIC_ASSERT(SK_ARRAY_COUNT(kConfigNames) == kGrPixelConfigCnt);
1118
1119    SkASSERT(!fConfigRenderSupport[kUnknown_GrPixelConfig][0]);
1120    SkASSERT(!fConfigRenderSupport[kUnknown_GrPixelConfig][1]);
1121
1122    for (size_t i = 1; i < SK_ARRAY_COUNT(kConfigNames); ++i)  {
1123        r.appendf("%s is renderable: %s, with MSAA: %s\n",
1124                  kConfigNames[i],
1125                  gNY[fConfigRenderSupport[i][0]],
1126                  gNY[fConfigRenderSupport[i][1]]);
1127    }
1128
1129    SkASSERT(!fConfigTextureSupport[kUnknown_GrPixelConfig]);
1130
1131    for (size_t i = 1; i < SK_ARRAY_COUNT(kConfigNames); ++i)  {
1132        r.appendf("%s is uploadable to a texture: %s\n",
1133                  kConfigNames[i],
1134                  gNY[fConfigTextureSupport[i]]);
1135    }
1136
1137    return r;
1138}
1139
1140uint32_t GrDrawTargetCaps::CreateUniqueID() {
1141    static int32_t gUniqueID = SK_InvalidUniqueID;
1142    uint32_t id;
1143    do {
1144        id = static_cast<uint32_t>(sk_atomic_inc(&gUniqueID) + 1);
1145    } while (id == SK_InvalidUniqueID);
1146    return id;
1147}
1148
1149///////////////////////////////////////////////////////////////////////////////////////////////////
1150
1151bool GrClipTarget::setupClip(const SkRect* devBounds,
1152                             GrDrawState::AutoRestoreEffects* are,
1153                             GrDrawState::AutoRestoreStencil* ars,
1154                             GrDrawState* ds,
1155                             GrClipMaskManager::ScissorState* scissorState) {
1156    return fClipMaskManager.setupClipping(ds,
1157                                          are,
1158                                          ars,
1159                                          scissorState,
1160                                          this->getClip(),
1161                                          devBounds);
1162}
1163