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1 /*
2  * Copyright 2015 Google Inc.
3  *
4  * Use of this source code is governed by a BSD-style license that can be
5  * found in the LICENSE file.
6  */
7 
8 #include "GrResourceProvider.h"
9 
10 #include "GrGpu.h"
11 #include "GrIndexBuffer.h"
12 #include "GrPathRendering.h"
13 #include "GrRenderTarget.h"
14 #include "GrRenderTargetPriv.h"
15 #include "GrResourceCache.h"
16 #include "GrResourceKey.h"
17 #include "GrStencilAttachment.h"
18 #include "GrVertexBuffer.h"
19 
20 GR_DECLARE_STATIC_UNIQUE_KEY(gQuadIndexBufferKey);
21 
GrResourceProvider(GrGpu * gpu,GrResourceCache * cache,GrSingleOwner * owner)22 GrResourceProvider::GrResourceProvider(GrGpu* gpu, GrResourceCache* cache, GrSingleOwner* owner)
23     : INHERITED(gpu, cache, owner) {
24     GR_DEFINE_STATIC_UNIQUE_KEY(gQuadIndexBufferKey);
25     fQuadIndexBufferKey = gQuadIndexBufferKey;
26 }
27 
createInstancedIndexBuffer(const uint16_t * pattern,int patternSize,int reps,int vertCount,const GrUniqueKey & key)28 const GrIndexBuffer* GrResourceProvider::createInstancedIndexBuffer(const uint16_t* pattern,
29                                                                     int patternSize,
30                                                                     int reps,
31                                                                     int vertCount,
32                                                                     const GrUniqueKey& key) {
33     size_t bufferSize = patternSize * reps * sizeof(uint16_t);
34 
35     // This is typically used in GrBatchs, so we assume kNoPendingIO.
36     GrIndexBuffer* buffer = this->createIndexBuffer(bufferSize, kStatic_BufferUsage,
37                                                     kNoPendingIO_Flag);
38     if (!buffer) {
39         return nullptr;
40     }
41     uint16_t* data = (uint16_t*) buffer->map();
42     bool useTempData = (nullptr == data);
43     if (useTempData) {
44         data = new uint16_t[reps * patternSize];
45     }
46     for (int i = 0; i < reps; ++i) {
47         int baseIdx = i * patternSize;
48         uint16_t baseVert = (uint16_t)(i * vertCount);
49         for (int j = 0; j < patternSize; ++j) {
50             data[baseIdx+j] = baseVert + pattern[j];
51         }
52     }
53     if (useTempData) {
54         if (!buffer->updateData(data, bufferSize)) {
55             buffer->unref();
56             return nullptr;
57         }
58         delete[] data;
59     } else {
60         buffer->unmap();
61     }
62     this->assignUniqueKeyToResource(key, buffer);
63     return buffer;
64 }
65 
createQuadIndexBuffer()66 const GrIndexBuffer* GrResourceProvider::createQuadIndexBuffer() {
67     static const int kMaxQuads = 1 << 12; // max possible: (1 << 14) - 1;
68     GR_STATIC_ASSERT(4 * kMaxQuads <= 65535);
69     static const uint16_t kPattern[] = { 0, 1, 2, 0, 2, 3 };
70 
71     return this->createInstancedIndexBuffer(kPattern, 6, kMaxQuads, 4, fQuadIndexBufferKey);
72 }
73 
createPath(const SkPath & path,const GrStrokeInfo & stroke)74 GrPath* GrResourceProvider::createPath(const SkPath& path, const GrStrokeInfo& stroke) {
75     SkASSERT(this->gpu()->pathRendering());
76     return this->gpu()->pathRendering()->createPath(path, stroke);
77 }
78 
createPathRange(GrPathRange::PathGenerator * gen,const GrStrokeInfo & stroke)79 GrPathRange* GrResourceProvider::createPathRange(GrPathRange::PathGenerator* gen,
80                                                  const GrStrokeInfo& stroke) {
81     SkASSERT(this->gpu()->pathRendering());
82     return this->gpu()->pathRendering()->createPathRange(gen, stroke);
83 }
84 
createGlyphs(const SkTypeface * tf,const SkDescriptor * desc,const GrStrokeInfo & stroke)85 GrPathRange* GrResourceProvider::createGlyphs(const SkTypeface* tf, const SkDescriptor* desc,
86                                               const GrStrokeInfo& stroke) {
87 
88     SkASSERT(this->gpu()->pathRendering());
89     return this->gpu()->pathRendering()->createGlyphs(tf, desc, stroke);
90 }
91 
createIndexBuffer(size_t size,BufferUsage usage,uint32_t flags)92 GrIndexBuffer* GrResourceProvider::createIndexBuffer(size_t size, BufferUsage usage,
93                                                      uint32_t flags) {
94     if (this->isAbandoned()) {
95         return nullptr;
96     }
97 
98     bool noPendingIO = SkToBool(flags & kNoPendingIO_Flag);
99     bool dynamic = kDynamic_BufferUsage == usage;
100     if (dynamic) {
101         // bin by pow2 with a reasonable min
102         static const uint32_t MIN_SIZE = 1 << 12;
103         size = SkTMax(MIN_SIZE, GrNextPow2(SkToUInt(size)));
104 
105         GrScratchKey key;
106         GrIndexBuffer::ComputeScratchKey(size, true, &key);
107         uint32_t scratchFlags = 0;
108         if (noPendingIO) {
109             scratchFlags = GrResourceCache::kRequireNoPendingIO_ScratchFlag;
110         } else {
111             scratchFlags = GrResourceCache::kPreferNoPendingIO_ScratchFlag;
112         }
113         GrGpuResource* resource = this->cache()->findAndRefScratchResource(key, size, scratchFlags);
114         if (resource) {
115             return static_cast<GrIndexBuffer*>(resource);
116         }
117     }
118     return this->gpu()->createIndexBuffer(size, dynamic);
119 }
120 
createVertexBuffer(size_t size,BufferUsage usage,uint32_t flags)121 GrVertexBuffer* GrResourceProvider::createVertexBuffer(size_t size, BufferUsage usage,
122                                                        uint32_t flags) {
123     if (this->isAbandoned()) {
124         return nullptr;
125     }
126 
127     bool noPendingIO = SkToBool(flags & kNoPendingIO_Flag);
128     bool dynamic = kDynamic_BufferUsage == usage;
129     if (dynamic) {
130         // bin by pow2 with a reasonable min
131         static const uint32_t MIN_SIZE = 1 << 12;
132         size = SkTMax(MIN_SIZE, GrNextPow2(SkToUInt(size)));
133 
134         GrScratchKey key;
135         GrVertexBuffer::ComputeScratchKey(size, true, &key);
136         uint32_t scratchFlags = 0;
137         if (noPendingIO) {
138             scratchFlags = GrResourceCache::kRequireNoPendingIO_ScratchFlag;
139         } else {
140             scratchFlags = GrResourceCache::kPreferNoPendingIO_ScratchFlag;
141         }
142         GrGpuResource* resource = this->cache()->findAndRefScratchResource(key, size, scratchFlags);
143         if (resource) {
144             return static_cast<GrVertexBuffer*>(resource);
145         }
146     }
147     return this->gpu()->createVertexBuffer(size, dynamic);
148 }
149 
createTransferBuffer(size_t size,TransferType type,uint32_t flags)150 GrTransferBuffer* GrResourceProvider::createTransferBuffer(size_t size, TransferType type,
151                                                            uint32_t flags) {
152     if (this->isAbandoned()) {
153         return nullptr;
154     }
155 
156     //bool noPendingIO = SkToBool(flags & kNoPendingIO_Flag);
157     return this->gpu()->createTransferBuffer(size, type);
158 }
159 
createAtlas(GrPixelConfig config,int width,int height,int numPlotsX,int numPlotsY,GrBatchAtlas::EvictionFunc func,void * data)160 GrBatchAtlas* GrResourceProvider::createAtlas(GrPixelConfig config,
161                                               int width, int height,
162                                               int numPlotsX, int numPlotsY,
163                                               GrBatchAtlas::EvictionFunc func, void* data) {
164     GrSurfaceDesc desc;
165     desc.fFlags = kNone_GrSurfaceFlags;
166     desc.fWidth = width;
167     desc.fHeight = height;
168     desc.fConfig = config;
169 
170     // We don't want to flush the context so we claim we're in the middle of flushing so as to
171     // guarantee we do not recieve a texture with pending IO
172     // TODO: Determine how to avoid having to do this. (https://bug.skia.org/4156)
173     static const uint32_t kFlags = GrResourceProvider::kNoPendingIO_Flag;
174     GrTexture* texture = this->createApproxTexture(desc, kFlags);
175     if (!texture) {
176         return nullptr;
177     }
178     GrBatchAtlas* atlas = new GrBatchAtlas(texture, numPlotsX, numPlotsY);
179     atlas->registerEvictionCallback(func, data);
180     return atlas;
181 }
182 
attachStencilAttachment(GrRenderTarget * rt)183 GrStencilAttachment* GrResourceProvider::attachStencilAttachment(GrRenderTarget* rt) {
184     SkASSERT(rt);
185     if (rt->renderTargetPriv().getStencilAttachment()) {
186         return rt->renderTargetPriv().getStencilAttachment();
187     }
188 
189     if (!rt->wasDestroyed() && rt->canAttemptStencilAttachment()) {
190         GrUniqueKey sbKey;
191 
192         int width = rt->width();
193         int height = rt->height();
194 #if 0
195         if (this->caps()->oversizedStencilSupport()) {
196             width  = SkNextPow2(width);
197             height = SkNextPow2(height);
198         }
199 #endif
200         bool newStencil = false;
201         GrStencilAttachment::ComputeSharedStencilAttachmentKey(width, height,
202                                                                rt->numStencilSamples(), &sbKey);
203         GrStencilAttachment* stencil = static_cast<GrStencilAttachment*>(
204             this->findAndRefResourceByUniqueKey(sbKey));
205         if (!stencil) {
206             // Need to try and create a new stencil
207             stencil = this->gpu()->createStencilAttachmentForRenderTarget(rt, width, height);
208             if (stencil) {
209                 stencil->resourcePriv().setUniqueKey(sbKey);
210                 newStencil = true;
211             }
212         }
213         if (rt->renderTargetPriv().attachStencilAttachment(stencil)) {
214             if (newStencil) {
215                 // Right now we're clearing the stencil attachment here after it is
216                 // attached to a RT for the first time. When we start matching
217                 // stencil buffers with smaller color targets this will no longer
218                 // be correct because it won't be guaranteed to clear the entire
219                 // sb.
220                 // We used to clear down in the GL subclass using a special purpose
221                 // FBO. But iOS doesn't allow a stencil-only FBO. It reports unsupported
222                 // FBO status.
223                 this->gpu()->clearStencil(rt);
224             }
225         }
226     }
227     return rt->renderTargetPriv().getStencilAttachment();
228 }
229 
wrapBackendTextureAsRenderTarget(const GrBackendTextureDesc & desc,GrWrapOwnership ownership)230 GrRenderTarget* GrResourceProvider::wrapBackendTextureAsRenderTarget(
231         const GrBackendTextureDesc& desc, GrWrapOwnership ownership) {
232     if (this->isAbandoned()) {
233         return nullptr;
234     }
235     return this->gpu()->wrapBackendTextureAsRenderTarget(desc, ownership);
236 }
237 
238