GrDrawTarget.cpp revision e3d7095c2374a423815e662020459832f389a40f 
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 "GrGpuVertex.h"
13#include "GrIndexBuffer.h"
14#include "GrRenderTarget.h"
15#include "GrTexture.h"
16#include "GrVertexBuffer.h"
17
18namespace {
19
20/**
21 * This function generates some masks that we like to have known at compile
22 * time. When the number of stages or tex coords is bumped or the way bits
23 * are defined in GrDrawTarget.h changes this funcion should be rerun to
24 * generate the new masks. (We attempted to force the compiler to generate the
25 * masks using recursive templates but always wound up with static initializers
26 * under gcc, even if they were just a series of immediate->memory moves.)
27 *
28 */
29void gen_mask_arrays(GrVertexLayout* stageTexCoordMasks,
30                     GrVertexLayout* stageMasks,
31                     GrVertexLayout* texCoordMasks) {
32    for (int s = 0; s < GrDrawState::kNumStages; ++s) {
33        stageTexCoordMasks[s] = 0;
34        for (int t = 0; t < GrDrawState::kMaxTexCoords; ++t) {
35            stageTexCoordMasks[s] |= GrDrawTarget::StageTexCoordVertexLayoutBit(s, t);
36        }
37        stageMasks[s] = stageTexCoordMasks[s] | GrDrawTarget::StagePosAsTexCoordVertexLayoutBit(s);
38    }
39    for (int t = 0; t < GrDrawState::kMaxTexCoords; ++t) {
40        texCoordMasks[t] = 0;
41        for (int s = 0; s < GrDrawState::kNumStages; ++s) {
42            texCoordMasks[t] |= GrDrawTarget::StageTexCoordVertexLayoutBit(s, t);
43        }
44    }
45}
46
47/**
48 * Run this function to generate the code that declares the global masks.
49 */
50void gen_globals() {
51    GrVertexLayout stageTexCoordMasks[GrDrawState::kNumStages];
52    GrVertexLayout stageMasks[GrDrawState::kNumStages];
53    GrVertexLayout texCoordMasks[GrDrawState::kMaxTexCoords];
54    gen_mask_arrays(stageTexCoordMasks, stageMasks, texCoordMasks);
55
56    GrPrintf("const GrVertexLayout gStageTexCoordMasks[] = {\n");
57    for (int s = 0; s < GrDrawState::kNumStages; ++s) {
58        GrPrintf("    0x%x,\n", stageTexCoordMasks[s]);
59    }
60    GrPrintf("};\n");
61    GrPrintf("GR_STATIC_ASSERT(GrDrawState::kNumStages == GR_ARRAY_COUNT(gStageTexCoordMasks));\n\n");
62    GrPrintf("const GrVertexLayout gStageMasks[] = {\n");
63    for (int s = 0; s < GrDrawState::kNumStages; ++s) {
64        GrPrintf("    0x%x,\n", stageMasks[s]);
65    }
66    GrPrintf("};\n");
67    GrPrintf("GR_STATIC_ASSERT(GrDrawState::kNumStages == GR_ARRAY_COUNT(gStageMasks));\n\n");
68    GrPrintf("const GrVertexLayout gTexCoordMasks[] = {\n");
69    for (int t = 0; t < GrDrawState::kMaxTexCoords; ++t) {
70        GrPrintf("    0x%x,\n", texCoordMasks[t]);
71    }
72    GrPrintf("};\n");
73    GrPrintf("GR_STATIC_ASSERT(GrDrawState::kMaxTexCoords == GR_ARRAY_COUNT(gTexCoordMasks));\n");
74}
75
76/* These values were generated by the above function */
77const GrVertexLayout gStageTexCoordMasks[] = {
78    0x49,
79    0x92,
80    0x124
81};
82
83GR_STATIC_ASSERT(GrDrawState::kNumStages == GR_ARRAY_COUNT(gStageTexCoordMasks));
84const GrVertexLayout gStageMasks[] = {
85    0x249,
86    0x492,
87    0x924
88};
89
90GR_STATIC_ASSERT(GrDrawState::kNumStages == GR_ARRAY_COUNT(gStageMasks));
91const GrVertexLayout gTexCoordMasks[] = {
92    0x7,
93    0x38,
94    0x1c0,
95};
96GR_STATIC_ASSERT(GrDrawState::kMaxTexCoords == GR_ARRAY_COUNT(gTexCoordMasks));
97
98bool check_layout(GrVertexLayout layout) {
99    // can only have 1 or 0 bits set for each stage.
100    for (int s = 0; s < GrDrawState::kNumStages; ++s) {
101        int stageBits = layout & gStageMasks[s];
102        if (stageBits && !GrIsPow2(stageBits)) {
103            return false;
104        }
105    }
106    return true;
107}
108
109int num_tex_coords(GrVertexLayout layout) {
110    int cnt = 0;
111    // figure out how many tex coordinates are present
112    for (int t = 0; t < GrDrawState::kMaxTexCoords; ++t) {
113        if (gTexCoordMasks[t] & layout) {
114            ++cnt;
115        }
116    }
117    return cnt;
118}
119
120} //unnamed namespace
121
122size_t GrDrawTarget::VertexSize(GrVertexLayout vertexLayout) {
123    GrAssert(check_layout(vertexLayout));
124
125    size_t vecSize = (vertexLayout & kTextFormat_VertexLayoutBit) ?
126                        sizeof(GrGpuTextVertex) :
127                        sizeof(GrPoint);
128
129    size_t size = vecSize; // position
130    size += num_tex_coords(vertexLayout) * vecSize;
131    if (vertexLayout & kColor_VertexLayoutBit) {
132        size += sizeof(GrColor);
133    }
134    if (vertexLayout & kCoverage_VertexLayoutBit) {
135        size += sizeof(GrColor);
136    }
137    if (vertexLayout & kEdge_VertexLayoutBit) {
138        size += 4 * sizeof(GrScalar);
139    }
140    return size;
141}
142
143////////////////////////////////////////////////////////////////////////////////
144
145/**
146 * Functions for computing offsets of various components from the layout
147 * bitfield.
148 *
149 * Order of vertex components:
150 * Position
151 * Tex Coord 0
152 * ...
153 * Tex Coord GrDrawState::kMaxTexCoords-1
154 * Color
155 * Coverage
156 */
157
158int GrDrawTarget::VertexStageCoordOffset(int stage, GrVertexLayout vertexLayout) {
159    GrAssert(check_layout(vertexLayout));
160    if (StagePosAsTexCoordVertexLayoutBit(stage) & vertexLayout) {
161        return 0;
162    }
163    int tcIdx = VertexTexCoordsForStage(stage, vertexLayout);
164    if (tcIdx >= 0) {
165
166        int vecSize = (vertexLayout & kTextFormat_VertexLayoutBit) ?
167                                    sizeof(GrGpuTextVertex) :
168                                    sizeof(GrPoint);
169        int offset = vecSize; // position
170        // figure out how many tex coordinates are present and precede this one.
171        for (int t = 0; t < tcIdx; ++t) {
172            if (gTexCoordMasks[t] & vertexLayout) {
173                offset += vecSize;
174            }
175        }
176        return offset;
177    }
178
179    return -1;
180}
181
182int GrDrawTarget::VertexColorOffset(GrVertexLayout vertexLayout) {
183    GrAssert(check_layout(vertexLayout));
184
185    if (vertexLayout & kColor_VertexLayoutBit) {
186        int vecSize = (vertexLayout & kTextFormat_VertexLayoutBit) ?
187                                    sizeof(GrGpuTextVertex) :
188                                    sizeof(GrPoint);
189        return vecSize * (num_tex_coords(vertexLayout) + 1); //+1 for pos
190    }
191    return -1;
192}
193
194int GrDrawTarget::VertexCoverageOffset(GrVertexLayout vertexLayout) {
195    GrAssert(check_layout(vertexLayout));
196
197    if (vertexLayout & kCoverage_VertexLayoutBit) {
198        int vecSize = (vertexLayout & kTextFormat_VertexLayoutBit) ?
199                                    sizeof(GrGpuTextVertex) :
200                                    sizeof(GrPoint);
201
202        int offset = vecSize * (num_tex_coords(vertexLayout) + 1);
203        if (vertexLayout & kColor_VertexLayoutBit) {
204            offset += sizeof(GrColor);
205        }
206        return offset;
207    }
208    return -1;
209}
210
211int GrDrawTarget::VertexEdgeOffset(GrVertexLayout vertexLayout) {
212    GrAssert(check_layout(vertexLayout));
213
214    // edge pts are after the pos, tex coords, and color
215    if (vertexLayout & kEdge_VertexLayoutBit) {
216        int vecSize = (vertexLayout & kTextFormat_VertexLayoutBit) ?
217                                    sizeof(GrGpuTextVertex) :
218                                    sizeof(GrPoint);
219        int offset = vecSize * (num_tex_coords(vertexLayout) + 1); //+1 for pos
220        if (vertexLayout & kColor_VertexLayoutBit) {
221            offset += sizeof(GrColor);
222        }
223        if (vertexLayout & kCoverage_VertexLayoutBit) {
224            offset += sizeof(GrColor);
225        }
226        return offset;
227    }
228    return -1;
229}
230
231int GrDrawTarget::VertexSizeAndOffsetsByIdx(
232        GrVertexLayout vertexLayout,
233        int texCoordOffsetsByIdx[GrDrawState::kMaxTexCoords],
234        int* colorOffset,
235        int* coverageOffset,
236        int* edgeOffset) {
237    GrAssert(check_layout(vertexLayout));
238
239    int vecSize = (vertexLayout & kTextFormat_VertexLayoutBit) ?
240                                                    sizeof(GrGpuTextVertex) :
241                                                    sizeof(GrPoint);
242    int size = vecSize; // position
243
244    for (int t = 0; t < GrDrawState::kMaxTexCoords; ++t) {
245        if (gTexCoordMasks[t] & vertexLayout) {
246            if (NULL != texCoordOffsetsByIdx) {
247                texCoordOffsetsByIdx[t] = size;
248            }
249            size += vecSize;
250        } else {
251            if (NULL != texCoordOffsetsByIdx) {
252                texCoordOffsetsByIdx[t] = -1;
253            }
254        }
255    }
256    if (kColor_VertexLayoutBit & vertexLayout) {
257        if (NULL != colorOffset) {
258            *colorOffset = size;
259        }
260        size += sizeof(GrColor);
261    } else {
262        if (NULL != colorOffset) {
263            *colorOffset = -1;
264        }
265    }
266    if (kCoverage_VertexLayoutBit & vertexLayout) {
267        if (NULL != coverageOffset) {
268            *coverageOffset = size;
269        }
270        size += sizeof(GrColor);
271    } else {
272        if (NULL != coverageOffset) {
273            *coverageOffset = -1;
274        }
275    }
276    if (kEdge_VertexLayoutBit & vertexLayout) {
277        if (NULL != edgeOffset) {
278            *edgeOffset = size;
279        }
280        size += 4 * sizeof(GrScalar);
281    } else {
282        if (NULL != edgeOffset) {
283            *edgeOffset = -1;
284        }
285    }
286    return size;
287}
288
289int GrDrawTarget::VertexSizeAndOffsetsByStage(
290        GrVertexLayout vertexLayout,
291        int texCoordOffsetsByStage[GrDrawState::kNumStages],
292        int* colorOffset,
293        int* coverageOffset,
294        int* edgeOffset) {
295    GrAssert(check_layout(vertexLayout));
296
297    int texCoordOffsetsByIdx[GrDrawState::kMaxTexCoords];
298    int size = VertexSizeAndOffsetsByIdx(vertexLayout,
299                                         (NULL == texCoordOffsetsByStage) ?
300                                               NULL :
301                                               texCoordOffsetsByIdx,
302                                         colorOffset,
303                                         coverageOffset,
304                                         edgeOffset);
305    if (NULL != texCoordOffsetsByStage) {
306        for (int s = 0; s < GrDrawState::kNumStages; ++s) {
307            int tcIdx;
308            if (StagePosAsTexCoordVertexLayoutBit(s) & vertexLayout) {
309                texCoordOffsetsByStage[s] = 0;
310            } else if ((tcIdx = VertexTexCoordsForStage(s, vertexLayout)) >= 0) {
311                texCoordOffsetsByStage[s] = texCoordOffsetsByIdx[tcIdx];
312            } else {
313                texCoordOffsetsByStage[s] = -1;
314            }
315        }
316    }
317    return size;
318}
319
320////////////////////////////////////////////////////////////////////////////////
321
322bool GrDrawTarget::VertexUsesStage(int stage, GrVertexLayout vertexLayout) {
323    GrAssert(stage < GrDrawState::kNumStages);
324    GrAssert(check_layout(vertexLayout));
325    return !!(gStageMasks[stage] & vertexLayout);
326}
327
328bool GrDrawTarget::VertexUsesTexCoordIdx(int coordIndex,
329                                         GrVertexLayout vertexLayout) {
330    GrAssert(coordIndex < GrDrawState::kMaxTexCoords);
331    GrAssert(check_layout(vertexLayout));
332    return !!(gTexCoordMasks[coordIndex] & vertexLayout);
333}
334
335int GrDrawTarget::VertexTexCoordsForStage(int stage,
336                                          GrVertexLayout vertexLayout) {
337    GrAssert(stage < GrDrawState::kNumStages);
338    GrAssert(check_layout(vertexLayout));
339    int bit = vertexLayout & gStageTexCoordMasks[stage];
340    if (bit) {
341        // figure out which set of texture coordates is used
342        // bits are ordered T0S0, T0S1, T0S2, ..., T1S0, T1S1, ...
343        // and start at bit 0.
344        GR_STATIC_ASSERT(sizeof(GrVertexLayout) <= sizeof(uint32_t));
345        return (32 - Gr_clz(bit) - 1) / GrDrawState::kNumStages;
346    }
347    return -1;
348}
349
350////////////////////////////////////////////////////////////////////////////////
351
352void GrDrawTarget::VertexLayoutUnitTest() {
353    // Ensure that our globals mask arrays are correct
354    GrVertexLayout stageTexCoordMasks[GrDrawState::kNumStages];
355    GrVertexLayout stageMasks[GrDrawState::kNumStages];
356    GrVertexLayout texCoordMasks[GrDrawState::kMaxTexCoords];
357    gen_mask_arrays(stageTexCoordMasks, stageMasks, texCoordMasks);
358    for (int s = 0; s < GrDrawState::kNumStages; ++s) {
359        GrAssert(stageTexCoordMasks[s] == gStageTexCoordMasks[s]);
360        GrAssert(stageMasks[s] == gStageMasks[s]);
361    }
362    for (int t = 0; t < GrDrawState::kMaxTexCoords; ++t) {
363        GrAssert(texCoordMasks[t] == gTexCoordMasks[t]);
364    }
365
366    // not necessarily exhaustive
367    static bool run;
368    if (!run) {
369        run = true;
370        for (int s = 0; s < GrDrawState::kNumStages; ++s) {
371
372            GrAssert(!VertexUsesStage(s, 0));
373            GrAssert(-1 == VertexStageCoordOffset(s, 0));
374            GrVertexLayout stageMask = 0;
375            for (int t = 0; t < GrDrawState::kMaxTexCoords; ++t) {
376                stageMask |= StageTexCoordVertexLayoutBit(s,t);
377            }
378            GrAssert(1 == GrDrawState::kMaxTexCoords ||
379                     !check_layout(stageMask));
380            GrAssert(gStageTexCoordMasks[s] == stageMask);
381            stageMask |= StagePosAsTexCoordVertexLayoutBit(s);
382            GrAssert(gStageMasks[s] == stageMask);
383            GrAssert(!check_layout(stageMask));
384        }
385        for (int t = 0; t < GrDrawState::kMaxTexCoords; ++t) {
386            GrVertexLayout tcMask = 0;
387            GrAssert(!VertexUsesTexCoordIdx(t, 0));
388            for (int s = 0; s < GrDrawState::kNumStages; ++s) {
389                tcMask |= StageTexCoordVertexLayoutBit(s,t);
390                GrAssert(VertexUsesStage(s, tcMask));
391                GrAssert(sizeof(GrPoint) == VertexStageCoordOffset(s, tcMask));
392                GrAssert(VertexUsesTexCoordIdx(t, tcMask));
393                GrAssert(2*sizeof(GrPoint) == VertexSize(tcMask));
394                GrAssert(t == VertexTexCoordsForStage(s, tcMask));
395                for (int s2 = s + 1; s2 < GrDrawState::kNumStages; ++s2) {
396                    GrAssert(-1 == VertexStageCoordOffset(s2, tcMask));
397                    GrAssert(!VertexUsesStage(s2, tcMask));
398                    GrAssert(-1 == VertexTexCoordsForStage(s2, tcMask));
399
400                #if GR_DEBUG
401                    GrVertexLayout posAsTex = tcMask | StagePosAsTexCoordVertexLayoutBit(s2);
402                #endif
403                    GrAssert(0 == VertexStageCoordOffset(s2, posAsTex));
404                    GrAssert(VertexUsesStage(s2, posAsTex));
405                    GrAssert(2*sizeof(GrPoint) == VertexSize(posAsTex));
406                    GrAssert(-1 == VertexTexCoordsForStage(s2, posAsTex));
407                    GrAssert(-1 == VertexEdgeOffset(posAsTex));
408                }
409                GrAssert(-1 == VertexEdgeOffset(tcMask));
410                GrAssert(-1 == VertexColorOffset(tcMask));
411                GrAssert(-1 == VertexCoverageOffset(tcMask));
412            #if GR_DEBUG
413                GrVertexLayout withColor = tcMask | kColor_VertexLayoutBit;
414            #endif
415                GrAssert(-1 == VertexCoverageOffset(withColor));
416                GrAssert(2*sizeof(GrPoint) == VertexColorOffset(withColor));
417                GrAssert(2*sizeof(GrPoint) + sizeof(GrColor) == VertexSize(withColor));
418            #if GR_DEBUG
419                GrVertexLayout withEdge = tcMask | kEdge_VertexLayoutBit;
420            #endif
421                GrAssert(-1 == VertexColorOffset(withEdge));
422                GrAssert(2*sizeof(GrPoint) == VertexEdgeOffset(withEdge));
423                GrAssert(4*sizeof(GrPoint) == VertexSize(withEdge));
424            #if GR_DEBUG
425                GrVertexLayout withColorAndEdge = withColor | kEdge_VertexLayoutBit;
426            #endif
427                GrAssert(2*sizeof(GrPoint) == VertexColorOffset(withColorAndEdge));
428                GrAssert(2*sizeof(GrPoint) + sizeof(GrColor) == VertexEdgeOffset(withColorAndEdge));
429                GrAssert(4*sizeof(GrPoint) + sizeof(GrColor) == VertexSize(withColorAndEdge));
430            #if GR_DEBUG
431                GrVertexLayout withCoverage = tcMask | kCoverage_VertexLayoutBit;
432            #endif
433                GrAssert(-1 == VertexColorOffset(withCoverage));
434                GrAssert(2*sizeof(GrPoint) == VertexCoverageOffset(withCoverage));
435                GrAssert(2*sizeof(GrPoint) + sizeof(GrColor) == VertexSize(withCoverage));
436            #if GR_DEBUG
437                GrVertexLayout withCoverageAndColor = tcMask | kCoverage_VertexLayoutBit |
438                                                      kColor_VertexLayoutBit;
439            #endif
440                GrAssert(2*sizeof(GrPoint) == VertexColorOffset(withCoverageAndColor));
441                GrAssert(2*sizeof(GrPoint) + sizeof(GrColor) == VertexCoverageOffset(withCoverageAndColor));
442                GrAssert(2*sizeof(GrPoint) + 2 * sizeof(GrColor) == VertexSize(withCoverageAndColor));
443            }
444            GrAssert(gTexCoordMasks[t] == tcMask);
445            GrAssert(check_layout(tcMask));
446
447            int stageOffsets[GrDrawState::kNumStages];
448            int colorOffset;
449            int edgeOffset;
450            int coverageOffset;
451            int size;
452            size = VertexSizeAndOffsetsByStage(tcMask,
453                                               stageOffsets, &colorOffset,
454                                               &coverageOffset, &edgeOffset);
455            GrAssert(2*sizeof(GrPoint) == size);
456            GrAssert(-1 == colorOffset);
457            GrAssert(-1 == coverageOffset);
458            GrAssert(-1 == edgeOffset);
459            for (int s = 0; s < GrDrawState::kNumStages; ++s) {
460                GrAssert(VertexUsesStage(s, tcMask));
461                GrAssert(sizeof(GrPoint) == stageOffsets[s]);
462                GrAssert(sizeof(GrPoint) == VertexStageCoordOffset(s, tcMask));
463            }
464        }
465    }
466}
467
468////////////////////////////////////////////////////////////////////////////////
469
470#define DEBUG_INVAL_BUFFER 0xdeadcafe
471#define DEBUG_INVAL_START_IDX -1
472
473GrDrawTarget::GrDrawTarget() {
474#if GR_DEBUG
475    VertexLayoutUnitTest();
476#endif
477    GeometrySrcState& geoSrc = fGeoSrcStateStack.push_back();
478#if GR_DEBUG
479    geoSrc.fVertexCount = DEBUG_INVAL_START_IDX;
480    geoSrc.fVertexBuffer = (GrVertexBuffer*)DEBUG_INVAL_BUFFER;
481    geoSrc.fIndexCount = DEBUG_INVAL_START_IDX;
482    geoSrc.fIndexBuffer = (GrIndexBuffer*)DEBUG_INVAL_BUFFER;
483#endif
484    geoSrc.fVertexSrc = kNone_GeometrySrcType;
485    geoSrc.fIndexSrc  = kNone_GeometrySrcType;
486}
487
488GrDrawTarget::~GrDrawTarget() {
489    GrAssert(1 == fGeoSrcStateStack.count());
490    GeometrySrcState& geoSrc = fGeoSrcStateStack.back();
491    GrAssert(kNone_GeometrySrcType == geoSrc.fIndexSrc);
492    GrAssert(kNone_GeometrySrcType == geoSrc.fVertexSrc);
493}
494
495void GrDrawTarget::releaseGeometry() {
496    int popCnt = fGeoSrcStateStack.count() - 1;
497    while (popCnt) {
498        this->popGeometrySource();
499        --popCnt;
500    }
501    this->resetVertexSource();
502    this->resetIndexSource();
503}
504
505void GrDrawTarget::setClip(const GrClip& clip) {
506    clipWillBeSet(clip);
507    fClip = clip;
508}
509
510const GrClip& GrDrawTarget::getClip() const {
511    return fClip;
512}
513
514void GrDrawTarget::saveCurrentDrawState(SavedDrawState* state) const {
515    state->fState.set(fCurrDrawState);
516}
517
518void GrDrawTarget::restoreDrawState(const SavedDrawState& state) {
519    fCurrDrawState = *state.fState.get();
520}
521
522void GrDrawTarget::copyDrawState(const GrDrawTarget& srcTarget) {
523    fCurrDrawState = srcTarget.fCurrDrawState;
524}
525
526bool GrDrawTarget::reserveVertexSpace(GrVertexLayout vertexLayout,
527                                      int vertexCount,
528                                      void** vertices) {
529    GeometrySrcState& geoSrc = fGeoSrcStateStack.back();
530    bool acquired = false;
531    if (vertexCount > 0) {
532        GrAssert(NULL != vertices);
533        this->releasePreviousVertexSource();
534        geoSrc.fVertexSrc = kNone_GeometrySrcType;
535
536        acquired = this->onReserveVertexSpace(vertexLayout,
537                                              vertexCount,
538                                              vertices);
539    }
540    if (acquired) {
541        geoSrc.fVertexSrc = kReserved_GeometrySrcType;
542        geoSrc.fVertexCount = vertexCount;
543        geoSrc.fVertexLayout = vertexLayout;
544    } else if (NULL != vertices) {
545        *vertices = NULL;
546    }
547    return acquired;
548}
549
550bool GrDrawTarget::reserveIndexSpace(int indexCount,
551                                     void** indices) {
552    GeometrySrcState& geoSrc = fGeoSrcStateStack.back();
553    bool acquired = false;
554    if (indexCount > 0) {
555        GrAssert(NULL != indices);
556        this->releasePreviousIndexSource();
557        geoSrc.fIndexSrc = kNone_GeometrySrcType;
558
559        acquired = this->onReserveIndexSpace(indexCount, indices);
560    }
561    if (acquired) {
562        geoSrc.fIndexSrc = kReserved_GeometrySrcType;
563        geoSrc.fIndexCount = indexCount;
564    } else if (NULL != indices) {
565        *indices = NULL;
566    }
567    return acquired;
568
569}
570
571bool GrDrawTarget::reserveVertexAndIndexSpace(GrVertexLayout vertexLayout,
572                                              int vertexCount,
573                                              int indexCount,
574                                              void** vertices,
575                                              void** indices) {
576    if (vertexCount) {
577        if (!this->reserveVertexSpace(vertexLayout, vertexCount, vertices)) {
578            if (indexCount) {
579                this->resetIndexSource();
580            }
581            return false;
582        }
583    }
584    if (indexCount) {
585        if (!this->reserveIndexSpace(indexCount, indices)) {
586            if (vertexCount) {
587                this->resetVertexSource();
588            }
589            return false;
590        }
591    }
592    return true;
593}
594
595bool GrDrawTarget::geometryHints(GrVertexLayout vertexLayout,
596                                 int32_t* vertexCount,
597                                 int32_t* indexCount) const {
598    if (NULL != vertexCount) {
599        *vertexCount = -1;
600    }
601    if (NULL != indexCount) {
602        *indexCount = -1;
603    }
604    return false;
605}
606
607void GrDrawTarget::releasePreviousVertexSource() {
608    GeometrySrcState& geoSrc = fGeoSrcStateStack.back();
609    switch (geoSrc.fVertexSrc) {
610        case kNone_GeometrySrcType:
611            break;
612        case kArray_GeometrySrcType:
613            this->releaseVertexArray();
614            break;
615        case kReserved_GeometrySrcType:
616            this->releaseReservedVertexSpace();
617            break;
618        case kBuffer_GeometrySrcType:
619            geoSrc.fVertexBuffer->unref();
620#if GR_DEBUG
621            geoSrc.fVertexBuffer = (GrVertexBuffer*)DEBUG_INVAL_BUFFER;
622#endif
623            break;
624        default:
625            GrCrash("Unknown Vertex Source Type.");
626            break;
627    }
628}
629
630void GrDrawTarget::releasePreviousIndexSource() {
631    GeometrySrcState& geoSrc = fGeoSrcStateStack.back();
632    switch (geoSrc.fIndexSrc) {
633        case kNone_GeometrySrcType:   // these two don't require
634            break;
635        case kArray_GeometrySrcType:
636            this->releaseIndexArray();
637            break;
638        case kReserved_GeometrySrcType:
639            this->releaseReservedIndexSpace();
640            break;
641        case kBuffer_GeometrySrcType:
642            geoSrc.fIndexBuffer->unref();
643#if GR_DEBUG
644            geoSrc.fIndexBuffer = (GrIndexBuffer*)DEBUG_INVAL_BUFFER;
645#endif
646            break;
647        default:
648            GrCrash("Unknown Index Source Type.");
649            break;
650    }
651}
652
653void GrDrawTarget::setVertexSourceToArray(GrVertexLayout vertexLayout,
654                                          const void* vertexArray,
655                                          int vertexCount) {
656    this->releasePreviousVertexSource();
657    GeometrySrcState& geoSrc = fGeoSrcStateStack.back();
658    geoSrc.fVertexSrc = kArray_GeometrySrcType;
659    geoSrc.fVertexLayout = vertexLayout;
660    geoSrc.fVertexCount = vertexCount;
661    this->onSetVertexSourceToArray(vertexArray, vertexCount);
662}
663
664void GrDrawTarget::setIndexSourceToArray(const void* indexArray,
665                                         int indexCount) {
666    this->releasePreviousIndexSource();
667    GeometrySrcState& geoSrc = fGeoSrcStateStack.back();
668    geoSrc.fIndexSrc = kArray_GeometrySrcType;
669    geoSrc.fIndexCount = indexCount;
670    this->onSetIndexSourceToArray(indexArray, indexCount);
671}
672
673void GrDrawTarget::setVertexSourceToBuffer(GrVertexLayout vertexLayout,
674                                           const GrVertexBuffer* buffer) {
675    this->releasePreviousVertexSource();
676    GeometrySrcState& geoSrc = fGeoSrcStateStack.back();
677    geoSrc.fVertexSrc    = kBuffer_GeometrySrcType;
678    geoSrc.fVertexBuffer = buffer;
679    buffer->ref();
680    geoSrc.fVertexLayout = vertexLayout;
681}
682
683void GrDrawTarget::setIndexSourceToBuffer(const GrIndexBuffer* buffer) {
684    this->releasePreviousIndexSource();
685    GeometrySrcState& geoSrc = fGeoSrcStateStack.back();
686    geoSrc.fIndexSrc     = kBuffer_GeometrySrcType;
687    geoSrc.fIndexBuffer  = buffer;
688    buffer->ref();
689}
690
691void GrDrawTarget::resetVertexSource() {
692    this->releasePreviousVertexSource();
693    GeometrySrcState& geoSrc = fGeoSrcStateStack.back();
694    geoSrc.fVertexSrc = kNone_GeometrySrcType;
695}
696
697void GrDrawTarget::resetIndexSource() {
698    this->releasePreviousIndexSource();
699    GeometrySrcState& geoSrc = fGeoSrcStateStack.back();
700    geoSrc.fIndexSrc = kNone_GeometrySrcType;
701}
702
703void GrDrawTarget::pushGeometrySource() {
704    this->geometrySourceWillPush();
705    GeometrySrcState& newState = fGeoSrcStateStack.push_back();
706    newState.fIndexSrc = kNone_GeometrySrcType;
707    newState.fVertexSrc = kNone_GeometrySrcType;
708#if GR_DEBUG
709    newState.fVertexCount  = ~0;
710    newState.fVertexBuffer = (GrVertexBuffer*)~0;
711    newState.fIndexCount   = ~0;
712    newState.fIndexBuffer = (GrIndexBuffer*)~0;
713#endif
714}
715
716void GrDrawTarget::popGeometrySource() {
717    const GeometrySrcState& geoSrc = this->getGeomSrc();
718    // if popping last element then pops are unbalanced with pushes
719    GrAssert(fGeoSrcStateStack.count() > 1);
720
721    this->geometrySourceWillPop(fGeoSrcStateStack.fromBack(1));
722    this->releasePreviousVertexSource();
723    this->releasePreviousIndexSource();
724    fGeoSrcStateStack.pop_back();
725}
726
727////////////////////////////////////////////////////////////////////////////////
728
729bool GrDrawTarget::checkDraw(GrPrimitiveType type, int startVertex,
730                             int startIndex, int vertexCount,
731                             int indexCount) const {
732#if GR_DEBUG
733    const GeometrySrcState& geoSrc = fGeoSrcStateStack.back();
734    int maxVertex = startVertex + vertexCount;
735    int maxValidVertex;
736    switch (geoSrc.fVertexSrc) {
737        case kNone_GeometrySrcType:
738            GrCrash("Attempting to draw without vertex src.");
739        case kReserved_GeometrySrcType: // fallthrough
740        case kArray_GeometrySrcType:
741            maxValidVertex = geoSrc.fVertexCount;
742            break;
743        case kBuffer_GeometrySrcType:
744            maxValidVertex = geoSrc.fVertexBuffer->sizeInBytes() /
745                             VertexSize(geoSrc.fVertexLayout);
746            break;
747    }
748    if (maxVertex > maxValidVertex) {
749        GrCrash("Drawing outside valid vertex range.");
750    }
751    if (indexCount > 0) {
752        int maxIndex = startIndex + indexCount;
753        int maxValidIndex;
754        switch (geoSrc.fIndexSrc) {
755            case kNone_GeometrySrcType:
756                GrCrash("Attempting to draw indexed geom without index src.");
757            case kReserved_GeometrySrcType: // fallthrough
758            case kArray_GeometrySrcType:
759                maxValidIndex = geoSrc.fIndexCount;
760                break;
761            case kBuffer_GeometrySrcType:
762                maxValidIndex = geoSrc.fIndexBuffer->sizeInBytes() / sizeof(uint16_t);
763                break;
764        }
765        if (maxIndex > maxValidIndex) {
766            GrCrash("Index reads outside valid index range.");
767        }
768    }
769#endif
770    const GrDrawState& drawState = this->getDrawState();
771    if (NULL == drawState.getRenderTarget()) {
772        return false;
773    }
774    if (GrPixelConfigIsUnpremultiplied(drawState.getRenderTarget()->config())) {
775        if (kOne_BlendCoeff != drawState.getSrcBlendCoeff() ||
776            kZero_BlendCoeff != drawState.getDstBlendCoeff()) {
777            return false;
778        }
779    }
780    for (int s = 0; s < GrDrawState::kNumStages; ++s) {
781        // We don't support using unpremultiplied textures with filters (other
782        // than nearest). Alpha-premulling is not distributive WRT to filtering.
783        // We'd have to filter each texel before filtering. We could do this for
784        // our custom filters but we would also have to disable bilerp and do
785        // a custom bilerp in the shader. Until Skia itself supports unpremul
786        // configs there is no pressure to implement this.
787        if (this->isStageEnabled(s) &&
788            GrPixelConfigIsUnpremultiplied(drawState.getTexture(s)->config()) &&
789            GrSamplerState::kNearest_Filter !=
790            drawState.getSampler(s).getFilter()) {
791            return false;
792        }
793    }
794    return true;
795}
796
797void GrDrawTarget::drawIndexed(GrPrimitiveType type, int startVertex,
798                               int startIndex, int vertexCount,
799                               int indexCount) {
800    if (indexCount > 0 &&
801        this->checkDraw(type, startVertex, startIndex,
802                        vertexCount, indexCount)) {
803        this->onDrawIndexed(type, startVertex, startIndex,
804                            vertexCount, indexCount);
805    }
806}
807
808void GrDrawTarget::drawNonIndexed(GrPrimitiveType type,
809                                  int startVertex,
810                                  int vertexCount) {
811    if (vertexCount > 0 &&
812        this->checkDraw(type, startVertex, -1, vertexCount, -1)) {
813        this->onDrawNonIndexed(type, startVertex, vertexCount);
814    }
815}
816
817////////////////////////////////////////////////////////////////////////////////
818
819// Some blend modes allow folding a partial coverage value into the color's
820// alpha channel, while others will blend incorrectly.
821bool GrDrawTarget::canTweakAlphaForCoverage() const {
822    /**
823     * The fractional coverage is f
824     * The src and dst coeffs are Cs and Cd
825     * The dst and src colors are S and D
826     * We want the blend to compute: f*Cs*S + (f*Cd + (1-f))D
827     * By tweaking the source color's alpha we're replacing S with S'=fS. It's
828     * obvious that that first term will always be ok. The second term can be
829     * rearranged as [1-(1-Cd)f]D. By substituing in the various possbilities
830     * for Cd we find that only 1, ISA, and ISC produce the correct depth
831     * coeffecient in terms of S' and D.
832     */
833    GrBlendCoeff dstCoeff = this->getDrawState().getDstBlendCoeff();
834    return kOne_BlendCoeff == dstCoeff ||
835           kISA_BlendCoeff == dstCoeff ||
836           kISC_BlendCoeff == dstCoeff;
837}
838
839
840bool GrDrawTarget::srcAlphaWillBeOne() const {
841    const GrVertexLayout& layout = this->getGeomSrc().fVertexLayout;
842    const GrDrawState& drawState = this->getDrawState();
843
844    // Check if per-vertex or constant color may have partial alpha
845    if ((layout & kColor_VertexLayoutBit) ||
846        0xff != GrColorUnpackA(drawState.getColor())) {
847        return false;
848    }
849    // Check if color filter could introduce an alpha
850    // (TODO: Consider being more aggressive with regards to detecting 0xff
851    // final alpha from color filter).
852    if (SkXfermode::kDst_Mode != drawState.getColorFilterMode()) {
853        return false;
854    }
855    // Check if a color stage could create a partial alpha
856    for (int s = 0; s < drawState.getFirstCoverageStage(); ++s) {
857        if (StageWillBeUsed(s, layout, fCurrDrawState)) {
858            GrAssert(NULL != drawState.getTexture(s));
859            GrPixelConfig config = drawState.getTexture(s)->config();
860            if (!GrPixelConfigIsOpaque(config)) {
861                return false;
862            }
863        }
864    }
865    return true;
866}
867
868GrDrawTarget::BlendOptFlags
869GrDrawTarget::getBlendOpts(bool forceCoverage,
870                           GrBlendCoeff* srcCoeff,
871                           GrBlendCoeff* dstCoeff) const {
872
873    const GrVertexLayout& layout = this->getGeomSrc().fVertexLayout;
874    const GrDrawState& drawState = this->getDrawState();
875
876    GrBlendCoeff bogusSrcCoeff, bogusDstCoeff;
877    if (NULL == srcCoeff) {
878        srcCoeff = &bogusSrcCoeff;
879    }
880    *srcCoeff = drawState.getSrcBlendCoeff();
881
882    if (NULL == dstCoeff) {
883        dstCoeff = &bogusDstCoeff;
884    }
885    *dstCoeff = drawState.getDstBlendCoeff();
886
887    // We don't ever expect source coeffecients to reference the source
888    GrAssert(kSA_BlendCoeff != *srcCoeff &&
889             kISA_BlendCoeff != *srcCoeff &&
890             kSC_BlendCoeff != *srcCoeff &&
891             kISC_BlendCoeff != *srcCoeff);
892    // same for dst
893    GrAssert(kDA_BlendCoeff != *dstCoeff &&
894             kIDA_BlendCoeff != *dstCoeff &&
895             kDC_BlendCoeff != *dstCoeff &&
896             kIDC_BlendCoeff != *dstCoeff);
897
898    if (drawState.isColorWriteDisabled()) {
899        *srcCoeff = kZero_BlendCoeff;
900        *dstCoeff = kOne_BlendCoeff;
901    }
902
903    bool srcAIsOne = this->srcAlphaWillBeOne();
904    bool dstCoeffIsOne = kOne_BlendCoeff == *dstCoeff ||
905                         (kSA_BlendCoeff == *dstCoeff && srcAIsOne);
906    bool dstCoeffIsZero = kZero_BlendCoeff == *dstCoeff ||
907                         (kISA_BlendCoeff == *dstCoeff && srcAIsOne);
908
909
910    // When coeffs are (0,1) there is no reason to draw at all, unless
911    // stenciling is enabled. Having color writes disabled is effectively
912    // (0,1). The same applies when coverage is known to be 0.
913    if ((kZero_BlendCoeff == *srcCoeff && dstCoeffIsOne) ||
914        (!(layout & kCoverage_VertexLayoutBit) &&
915         0 == drawState.getCoverage())) {
916        if (drawState.getStencil().doesWrite()) {
917            return kDisableBlend_BlendOptFlag |
918                   kEmitTransBlack_BlendOptFlag;
919        } else {
920            return kSkipDraw_BlendOptFlag;
921        }
922    }
923
924    // check for coverage due to constant coverage, per-vertex coverage,
925    // edge aa or coverage texture stage
926    bool hasCoverage = forceCoverage ||
927                       0xffffffff != drawState.getCoverage() ||
928                       drawState.getNumAAEdges() > 0 ||
929                       (layout & kCoverage_VertexLayoutBit) ||
930                       (layout & kEdge_VertexLayoutBit);
931    for (int s = drawState.getFirstCoverageStage();
932         !hasCoverage && s < GrDrawState::kNumStages;
933         ++s) {
934        if (StageWillBeUsed(s, layout, fCurrDrawState)) {
935            hasCoverage = true;
936        }
937    }
938
939    // if we don't have coverage we can check whether the dst
940    // has to read at all. If not, we'll disable blending.
941    if (!hasCoverage) {
942        if (dstCoeffIsZero) {
943            if (kOne_BlendCoeff == *srcCoeff) {
944                // if there is no coverage and coeffs are (1,0) then we
945                // won't need to read the dst at all, it gets replaced by src
946                return kDisableBlend_BlendOptFlag;
947            } else if (kZero_BlendCoeff == *srcCoeff) {
948                // if the op is "clear" then we don't need to emit a color
949                // or blend, just write transparent black into the dst.
950                *srcCoeff = kOne_BlendCoeff;
951                *dstCoeff = kZero_BlendCoeff;
952                return kDisableBlend_BlendOptFlag |
953                       kEmitTransBlack_BlendOptFlag;
954            }
955        }
956    } else {
957        // check whether coverage can be safely rolled into alpha
958        // of if we can skip color computation and just emit coverage
959        if (this->canTweakAlphaForCoverage()) {
960            return kCoverageAsAlpha_BlendOptFlag;
961        }
962        if (dstCoeffIsZero) {
963            if (kZero_BlendCoeff == *srcCoeff) {
964                // the source color is not included in the blend
965                // the dst coeff is effectively zero so blend works out to:
966                // (c)(0)D + (1-c)D = (1-c)D.
967                *dstCoeff = kISA_BlendCoeff;
968                return  kEmitCoverage_BlendOptFlag;
969            } else if (srcAIsOne) {
970                // the dst coeff is effectively zero so blend works out to:
971                // cS + (c)(0)D + (1-c)D = cS + (1-c)D.
972                // If Sa is 1 then we can replace Sa with c
973                // and set dst coeff to 1-Sa.
974                *dstCoeff = kISA_BlendCoeff;
975                return  kCoverageAsAlpha_BlendOptFlag;
976            }
977        } else if (dstCoeffIsOne) {
978            // the dst coeff is effectively one so blend works out to:
979            // cS + (c)(1)D + (1-c)D = cS + D.
980            *dstCoeff = kOne_BlendCoeff;
981            return  kCoverageAsAlpha_BlendOptFlag;
982        }
983    }
984    return kNone_BlendOpt;
985}
986
987bool GrDrawTarget::willUseHWAALines() const {
988    // there is a conflict between using smooth lines and our use of
989    // premultiplied alpha. Smooth lines tweak the incoming alpha value
990    // but not in a premul-alpha way. So we only use them when our alpha
991    // is 0xff and tweaking the color for partial coverage is OK
992    if (!fCaps.fHWAALineSupport ||
993        !this->getDrawState().isHWAntialiasState()) {
994        return false;
995    }
996    BlendOptFlags opts = this->getBlendOpts();
997    return (kDisableBlend_BlendOptFlag & opts) &&
998           (kCoverageAsAlpha_BlendOptFlag & opts);
999}
1000
1001bool GrDrawTarget::canApplyCoverage() const {
1002    // we can correctly apply coverage if a) we have dual source blending
1003    // or b) one of our blend optimizations applies.
1004    return this->getCaps().fDualSourceBlendingSupport ||
1005           kNone_BlendOpt != this->getBlendOpts(true);
1006}
1007
1008bool GrDrawTarget::drawWillReadDst() const {
1009    return SkToBool((kDisableBlend_BlendOptFlag | kSkipDraw_BlendOptFlag) &
1010                    this->getBlendOpts());
1011}
1012
1013
1014////////////////////////////////////////////////////////////////////////////////
1015
1016void GrDrawTarget::drawRect(const GrRect& rect,
1017                            const GrMatrix* matrix,
1018                            StageMask stageMask,
1019                            const GrRect* srcRects[],
1020                            const GrMatrix* srcMatrices[]) {
1021    GrVertexLayout layout = GetRectVertexLayout(stageMask, srcRects);
1022
1023    AutoReleaseGeometry geo(this, layout, 4, 0);
1024    if (!geo.succeeded()) {
1025        GrPrintf("Failed to get space for vertices!\n");
1026        return;
1027    }
1028
1029    SetRectVertices(rect, matrix, srcRects,
1030                    srcMatrices, layout, geo.vertices());
1031
1032    drawNonIndexed(kTriangleFan_PrimitiveType, 0, 4);
1033}
1034
1035GrVertexLayout GrDrawTarget::GetRectVertexLayout(StageMask stageMask,
1036                                                 const GrRect* srcRects[]) {
1037    GrVertexLayout layout = 0;
1038
1039    for (int i = 0; i < GrDrawState::kNumStages; ++i) {
1040        int numTC = 0;
1041        if (stageMask & (1 << i)) {
1042            if (NULL != srcRects && NULL != srcRects[i]) {
1043                layout |= StageTexCoordVertexLayoutBit(i, numTC);
1044                ++numTC;
1045            } else {
1046                layout |= StagePosAsTexCoordVertexLayoutBit(i);
1047            }
1048        }
1049    }
1050    return layout;
1051}
1052
1053void GrDrawTarget::clipWillBeSet(const GrClip& clip) {
1054}
1055
1056void GrDrawTarget::SetRectVertices(const GrRect& rect,
1057                                   const GrMatrix* matrix,
1058                                   const GrRect* srcRects[],
1059                                   const GrMatrix* srcMatrices[],
1060                                   GrVertexLayout layout,
1061                                   void* vertices) {
1062#if GR_DEBUG
1063    // check that the layout and srcRects agree
1064    for (int i = 0; i < GrDrawState::kNumStages; ++i) {
1065        if (VertexTexCoordsForStage(i, layout) >= 0) {
1066            GR_DEBUGASSERT(NULL != srcRects && NULL != srcRects[i]);
1067        } else {
1068            GR_DEBUGASSERT(NULL == srcRects || NULL == srcRects[i]);
1069        }
1070    }
1071#endif
1072
1073    int stageOffsets[GrDrawState::kNumStages];
1074    int vsize = VertexSizeAndOffsetsByStage(layout, stageOffsets,
1075                                            NULL, NULL, NULL);
1076
1077    GrTCast<GrPoint*>(vertices)->setRectFan(rect.fLeft, rect.fTop,
1078                                            rect.fRight, rect.fBottom,
1079                                            vsize);
1080    if (NULL != matrix) {
1081        matrix->mapPointsWithStride(GrTCast<GrPoint*>(vertices), vsize, 4);
1082    }
1083
1084    for (int i = 0; i < GrDrawState::kNumStages; ++i) {
1085        if (stageOffsets[i] > 0) {
1086            GrPoint* coords = GrTCast<GrPoint*>(GrTCast<intptr_t>(vertices) +
1087                                                stageOffsets[i]);
1088            coords->setRectFan(srcRects[i]->fLeft, srcRects[i]->fTop,
1089                               srcRects[i]->fRight, srcRects[i]->fBottom,
1090                               vsize);
1091            if (NULL != srcMatrices && NULL != srcMatrices[i]) {
1092                srcMatrices[i]->mapPointsWithStride(coords, vsize, 4);
1093            }
1094        }
1095    }
1096}
1097
1098////////////////////////////////////////////////////////////////////////////////
1099
1100GrDrawTarget::AutoStateRestore::AutoStateRestore() {
1101    fDrawTarget = NULL;
1102}
1103
1104GrDrawTarget::AutoStateRestore::AutoStateRestore(GrDrawTarget* target) {
1105    fDrawTarget = target;
1106    if (NULL != fDrawTarget) {
1107        fDrawTarget->saveCurrentDrawState(&fDrawState);
1108    }
1109}
1110
1111GrDrawTarget::AutoStateRestore::~AutoStateRestore() {
1112    if (NULL != fDrawTarget) {
1113        fDrawTarget->restoreDrawState(fDrawState);
1114    }
1115}
1116
1117void GrDrawTarget::AutoStateRestore::set(GrDrawTarget* target) {
1118    if (target != fDrawTarget) {
1119        if (NULL != fDrawTarget) {
1120            fDrawTarget->restoreDrawState(fDrawState);
1121        }
1122        if (NULL != target) {
1123            target->saveCurrentDrawState(&fDrawState);
1124        }
1125        fDrawTarget = target;
1126    }
1127}
1128
1129////////////////////////////////////////////////////////////////////////////////
1130
1131GrDrawTarget::AutoDeviceCoordDraw::AutoDeviceCoordDraw(
1132                                            GrDrawTarget* target,
1133                                            GrDrawState::StageMask stageMask) {
1134    GrAssert(NULL != target);
1135    GrDrawState* drawState = target->drawState();
1136
1137    fDrawTarget = target;
1138    fViewMatrix = drawState->getViewMatrix();
1139    fStageMask = stageMask;
1140    if (fStageMask) {
1141        GrMatrix invVM;
1142        if (fViewMatrix.invert(&invVM)) {
1143            for (int s = 0; s < GrDrawState::kNumStages; ++s) {
1144                if (fStageMask & (1 << s)) {
1145                    fSamplerMatrices[s] = drawState->getSampler(s).getMatrix();
1146                }
1147            }
1148            drawState->preConcatSamplerMatrices(fStageMask, invVM);
1149        } else {
1150            // sad trombone sound
1151            fStageMask = 0;
1152        }
1153    }
1154    drawState->setViewMatrix(GrMatrix::I());
1155}
1156
1157GrDrawTarget::AutoDeviceCoordDraw::~AutoDeviceCoordDraw() {
1158    GrDrawState* drawState = fDrawTarget->drawState();
1159    drawState->setViewMatrix(fViewMatrix);
1160    for (int s = 0; s < GrDrawState::kNumStages; ++s) {
1161        if (fStageMask & (1 << s)) {
1162            *drawState->sampler(s)->matrix() = fSamplerMatrices[s];
1163        }
1164    }
1165}
1166
1167////////////////////////////////////////////////////////////////////////////////
1168
1169GrDrawTarget::AutoReleaseGeometry::AutoReleaseGeometry(
1170                                         GrDrawTarget*  target,
1171                                         GrVertexLayout vertexLayout,
1172                                         int vertexCount,
1173                                         int indexCount) {
1174    fTarget = NULL;
1175    this->set(target, vertexLayout, vertexCount, indexCount);
1176}
1177
1178GrDrawTarget::AutoReleaseGeometry::AutoReleaseGeometry() {
1179    fTarget = NULL;
1180}
1181
1182GrDrawTarget::AutoReleaseGeometry::~AutoReleaseGeometry() {
1183    this->reset();
1184}
1185
1186bool GrDrawTarget::AutoReleaseGeometry::set(GrDrawTarget*  target,
1187                                            GrVertexLayout vertexLayout,
1188                                            int vertexCount,
1189                                            int indexCount) {
1190    this->reset();
1191    fTarget = target;
1192    bool success = true;
1193    if (NULL != fTarget) {
1194        fTarget = target;
1195        success = target->reserveVertexAndIndexSpace(vertexLayout,
1196                                                     vertexCount,
1197                                                     indexCount,
1198                                                     &fVertices,
1199                                                     &fIndices);
1200        if (!success) {
1201            fTarget = NULL;
1202            this->reset();
1203        }
1204    }
1205    GrAssert(success == (NULL != fTarget));
1206    return success;
1207}
1208
1209void GrDrawTarget::AutoReleaseGeometry::reset() {
1210    if (NULL != fTarget) {
1211        if (NULL != fVertices) {
1212            fTarget->resetVertexSource();
1213        }
1214        if (NULL != fIndices) {
1215            fTarget->resetIndexSource();
1216        }
1217        fTarget = NULL;
1218    }
1219    fVertices = NULL;
1220    fIndices = NULL;
1221}
1222
1223void GrDrawTarget::Caps::print() const {
1224    static const char* gNY[] = {"NO", "YES"};
1225    GrPrintf("8 Bit Palette Support       : %s\n", gNY[f8BitPaletteSupport]);
1226    GrPrintf("NPOT Texture Tile Support   : %s\n", gNY[fNPOTTextureTileSupport]);
1227    GrPrintf("Two Sided Stencil Support   : %s\n", gNY[fTwoSidedStencilSupport]);
1228    GrPrintf("Stencil Wrap Ops  Support   : %s\n", gNY[fStencilWrapOpsSupport]);
1229    GrPrintf("HW AA Lines Support         : %s\n", gNY[fHWAALineSupport]);
1230    GrPrintf("Shader Derivative Support   : %s\n", gNY[fShaderDerivativeSupport]);
1231    GrPrintf("Geometry Shader Support     : %s\n", gNY[fGeometryShaderSupport]);
1232    GrPrintf("FSAA Support                : %s\n", gNY[fFSAASupport]);
1233    GrPrintf("Dual Source Blending Support: %s\n", gNY[fDualSourceBlendingSupport]);
1234    GrPrintf("Buffer Lock Support         : %s\n", gNY[fBufferLockSupport]);
1235    GrPrintf("Max Texture Size            : %d\n", fMaxTextureSize);
1236    GrPrintf("Max Render Target Size      : %d\n", fMaxRenderTargetSize);
1237}
1238
1239