bsalomon@google.com | 1c13c96 | 2011-02-14 16:51:21 +0000 | [diff] [blame] | 1 | /* |
| 2 | Copyright 2010 Google Inc. |
| 3 | |
| 4 | Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | you may not use this file except in compliance with the License. |
| 6 | You may obtain a copy of the License at |
| 7 | |
| 8 | http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | |
| 10 | Unless required by applicable law or agreed to in writing, software |
| 11 | distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | See the License for the specific language governing permissions and |
| 14 | limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | #include "GrBufferAllocPool.h" |
| 18 | #include "GrTypes.h" |
| 19 | #include "GrVertexBuffer.h" |
| 20 | #include "GrIndexBuffer.h" |
| 21 | #include "GrGpu.h" |
| 22 | |
| 23 | #if GR_DEBUG |
| 24 | #define VALIDATE validate |
| 25 | #else |
| 26 | #define VALIDATE() |
| 27 | #endif |
| 28 | |
| 29 | #define GrBufferAllocPool_MIN_BLOCK_SIZE ((size_t)1 << 12) |
| 30 | |
| 31 | GrBufferAllocPool::GrBufferAllocPool(GrGpu* gpu, |
| 32 | BufferType bufferType, |
| 33 | bool frequentResetHint, |
| 34 | size_t blockSize, |
| 35 | int preallocBufferCnt) : |
| 36 | fBlocks(GrMax(8, 2*preallocBufferCnt)) { |
| 37 | GrAssert(NULL != gpu); |
| 38 | fGpu = gpu; |
| 39 | fBufferType = bufferType; |
| 40 | fFrequentResetHint = frequentResetHint; |
| 41 | fGpu->ref(); |
| 42 | fBufferPtr = NULL; |
| 43 | fMinBlockSize = GrMax(GrBufferAllocPool_MIN_BLOCK_SIZE, blockSize); |
| 44 | |
| 45 | fPreallocBuffersInUse = 0; |
| 46 | fFirstPreallocBuffer = 0; |
| 47 | for (int i = 0; i < preallocBufferCnt; ++i) { |
| 48 | GrGeometryBuffer* buffer = this->createBuffer(fMinBlockSize); |
| 49 | if (NULL != buffer) { |
| 50 | *fPreallocBuffers.append() = buffer; |
| 51 | buffer->ref(); |
| 52 | } |
| 53 | } |
| 54 | } |
| 55 | |
| 56 | GrBufferAllocPool::~GrBufferAllocPool() { |
| 57 | VALIDATE(); |
| 58 | if (fBlocks.count()) { |
| 59 | GrGeometryBuffer* buffer = fBlocks.back().fBuffer; |
| 60 | if (buffer->isLocked()) { |
| 61 | buffer->unlock(); |
| 62 | } |
| 63 | } |
| 64 | fPreallocBuffers.unrefAll(); |
| 65 | while (!fBlocks.empty()) { |
| 66 | destroyBlock(); |
| 67 | } |
| 68 | fGpu->unref(); |
| 69 | } |
| 70 | |
| 71 | void GrBufferAllocPool::reset() { |
| 72 | VALIDATE(); |
| 73 | if (fBlocks.count()) { |
| 74 | GrGeometryBuffer* buffer = fBlocks.back().fBuffer; |
| 75 | if (buffer->isLocked()) { |
| 76 | buffer->unlock(); |
| 77 | } |
| 78 | } |
| 79 | while (!fBlocks.empty()) { |
| 80 | destroyBlock(); |
| 81 | } |
| 82 | if (fPreallocBuffers.count()) { |
| 83 | // must set this after above loop. |
| 84 | fFirstPreallocBuffer = (fFirstPreallocBuffer + fPreallocBuffersInUse) % |
| 85 | fPreallocBuffers.count(); |
| 86 | } |
| 87 | fCpuData.realloc(fGpu->supportsBufferLocking() ? 0 : fMinBlockSize); |
| 88 | GrAssert(0 == fPreallocBuffersInUse); |
| 89 | VALIDATE(); |
| 90 | } |
| 91 | |
| 92 | void GrBufferAllocPool::unlock() { |
| 93 | VALIDATE(); |
| 94 | |
| 95 | if (NULL != fBufferPtr) { |
| 96 | BufferBlock& block = fBlocks.back(); |
| 97 | if (block.fBuffer->isLocked()) { |
| 98 | block.fBuffer->unlock(); |
| 99 | } else { |
| 100 | size_t flushSize = block.fBuffer->size() - block.fBytesFree; |
| 101 | flushCpuData(fBlocks.back().fBuffer, flushSize); |
| 102 | } |
| 103 | fBufferPtr = NULL; |
| 104 | } |
| 105 | VALIDATE(); |
| 106 | } |
| 107 | |
| 108 | #if GR_DEBUG |
| 109 | void GrBufferAllocPool::validate() const { |
| 110 | if (NULL != fBufferPtr) { |
| 111 | GrAssert(!fBlocks.empty()); |
| 112 | if (fBlocks.back().fBuffer->isLocked()) { |
| 113 | GrGeometryBuffer* buf = fBlocks.back().fBuffer; |
| 114 | GrAssert(buf->lockPtr() == fBufferPtr); |
| 115 | } else { |
| 116 | GrAssert(fCpuData.get() == fBufferPtr); |
| 117 | GrAssert(fCpuData.size() == fBlocks.back().fBuffer->size()); |
| 118 | } |
| 119 | } else { |
| 120 | GrAssert(fBlocks.empty() || !fBlocks.back().fBuffer->isLocked()); |
| 121 | } |
| 122 | for (int i = 0; i < fBlocks.count() - 1; ++i) { |
| 123 | GrAssert(!fBlocks[i].fBuffer->isLocked()); |
| 124 | } |
| 125 | } |
| 126 | #endif |
| 127 | |
| 128 | void* GrBufferAllocPool::makeSpace(size_t size, |
| 129 | size_t alignment, |
| 130 | const GrGeometryBuffer** buffer, |
| 131 | size_t* offset) { |
| 132 | VALIDATE(); |
| 133 | |
| 134 | GrAssert(NULL != buffer); |
| 135 | GrAssert(NULL != offset); |
| 136 | |
| 137 | if (NULL != fBufferPtr) { |
| 138 | BufferBlock& back = fBlocks.back(); |
| 139 | size_t usedBytes = back.fBuffer->size() - back.fBytesFree; |
| 140 | size_t pad = GrSizeAlignUpPad(usedBytes, |
| 141 | alignment); |
| 142 | if ((size + pad) <= back.fBytesFree) { |
| 143 | usedBytes += pad; |
| 144 | *offset = usedBytes; |
| 145 | *buffer = back.fBuffer; |
| 146 | back.fBytesFree -= size + pad; |
| 147 | return (void*)(reinterpret_cast<intptr_t>(fBufferPtr) + usedBytes); |
| 148 | } |
| 149 | } |
| 150 | |
| 151 | if (!createBlock(size)) { |
| 152 | return NULL; |
| 153 | } |
| 154 | VALIDATE(); |
| 155 | GrAssert(NULL != fBufferPtr); |
| 156 | |
| 157 | *offset = 0; |
| 158 | BufferBlock& back = fBlocks.back(); |
| 159 | *buffer = back.fBuffer; |
| 160 | back.fBytesFree -= size; |
| 161 | return fBufferPtr; |
| 162 | } |
| 163 | |
| 164 | int GrBufferAllocPool::currentBufferItems(size_t itemSize) const { |
| 165 | VALIDATE(); |
| 166 | if (NULL != fBufferPtr) { |
| 167 | const BufferBlock& back = fBlocks.back(); |
| 168 | size_t usedBytes = back.fBuffer->size() - back.fBytesFree; |
| 169 | size_t pad = GrSizeAlignUpPad(usedBytes, itemSize); |
| 170 | return (back.fBytesFree - pad) / itemSize; |
| 171 | } else if (fPreallocBuffersInUse < fPreallocBuffers.count()) { |
| 172 | return fMinBlockSize / itemSize; |
| 173 | } |
| 174 | return 0; |
| 175 | } |
| 176 | |
| 177 | int GrBufferAllocPool::preallocatedBuffersRemaining() const { |
| 178 | return fPreallocBuffers.count() - fPreallocBuffersInUse; |
| 179 | } |
| 180 | |
| 181 | int GrBufferAllocPool::preallocatedBufferCount() const { |
| 182 | return fPreallocBuffers.count(); |
| 183 | } |
| 184 | |
| 185 | void GrBufferAllocPool::putBack(size_t bytes) { |
| 186 | VALIDATE(); |
| 187 | if (NULL != fBufferPtr) { |
| 188 | BufferBlock& back = fBlocks.back(); |
| 189 | size_t bytesUsed = back.fBuffer->size() - back.fBytesFree; |
| 190 | if (bytes >= bytesUsed) { |
| 191 | destroyBlock(); |
| 192 | bytes -= bytesUsed; |
| 193 | } else { |
| 194 | back.fBytesFree += bytes; |
| 195 | return; |
| 196 | } |
| 197 | } |
| 198 | VALIDATE(); |
| 199 | GrAssert(NULL == fBufferPtr); |
| 200 | // we don't partially roll-back buffers because our VB semantics say locking |
| 201 | // a VB discards its previous content. |
| 202 | // We could honor it by being sure we use updateSubData and not lock |
| 203 | // we will roll-back fully released buffers, though. |
| 204 | while (!fBlocks.empty() && |
| 205 | bytes >= fBlocks.back().fBuffer->size()) { |
| 206 | bytes -= fBlocks.back().fBuffer->size(); |
| 207 | destroyBlock(); |
| 208 | } |
| 209 | VALIDATE(); |
| 210 | } |
| 211 | |
| 212 | bool GrBufferAllocPool::createBlock(size_t requestSize) { |
| 213 | |
| 214 | size_t size = GrMax(requestSize, fMinBlockSize); |
| 215 | GrAssert(size >= GrBufferAllocPool_MIN_BLOCK_SIZE); |
| 216 | |
| 217 | VALIDATE(); |
| 218 | |
| 219 | BufferBlock& block = fBlocks.push_back(); |
| 220 | |
| 221 | if (size == fMinBlockSize && |
| 222 | fPreallocBuffersInUse < fPreallocBuffers.count()) { |
| 223 | |
| 224 | uint32_t nextBuffer = (fPreallocBuffersInUse + fFirstPreallocBuffer) % |
| 225 | fPreallocBuffers.count(); |
| 226 | block.fBuffer = fPreallocBuffers[nextBuffer]; |
| 227 | block.fBuffer->ref(); |
| 228 | ++fPreallocBuffersInUse; |
| 229 | } else { |
| 230 | block.fBuffer = this->createBuffer(size); |
| 231 | if (NULL == block.fBuffer) { |
| 232 | fBlocks.pop_back(); |
| 233 | return false; |
| 234 | } |
| 235 | } |
| 236 | |
| 237 | block.fBytesFree = size; |
| 238 | if (NULL != fBufferPtr) { |
| 239 | GrAssert(fBlocks.count() > 1); |
| 240 | BufferBlock& prev = fBlocks.fromBack(1); |
| 241 | if (prev.fBuffer->isLocked()) { |
| 242 | prev.fBuffer->unlock(); |
| 243 | } else { |
| 244 | flushCpuData(prev.fBuffer, |
| 245 | prev.fBuffer->size() - prev.fBytesFree); |
| 246 | } |
| 247 | fBufferPtr = NULL; |
| 248 | } |
| 249 | |
| 250 | GrAssert(NULL == fBufferPtr); |
| 251 | |
| 252 | if (fGpu->supportsBufferLocking() && |
| 253 | size > GR_GEOM_BUFFER_LOCK_THRESHOLD && |
| 254 | (!fFrequentResetHint || requestSize > GR_GEOM_BUFFER_LOCK_THRESHOLD)) { |
| 255 | fBufferPtr = block.fBuffer->lock(); |
| 256 | } |
| 257 | |
| 258 | if (NULL == fBufferPtr) { |
| 259 | fBufferPtr = fCpuData.realloc(size); |
| 260 | } |
| 261 | |
| 262 | VALIDATE(); |
| 263 | |
| 264 | return true; |
| 265 | } |
| 266 | |
| 267 | void GrBufferAllocPool::destroyBlock() { |
| 268 | GrAssert(!fBlocks.empty()); |
| 269 | |
| 270 | BufferBlock& block = fBlocks.back(); |
| 271 | if (fPreallocBuffersInUse > 0) { |
| 272 | uint32_t prevPreallocBuffer = (fPreallocBuffersInUse + |
| 273 | fFirstPreallocBuffer + |
| 274 | (fPreallocBuffers.count() - 1)) % |
| 275 | fPreallocBuffers.count(); |
| 276 | if (block.fBuffer == fPreallocBuffers[prevPreallocBuffer]) { |
| 277 | --fPreallocBuffersInUse; |
| 278 | } |
| 279 | } |
| 280 | GrAssert(!block.fBuffer->isLocked()); |
| 281 | block.fBuffer->unref(); |
| 282 | fBlocks.pop_back(); |
| 283 | fBufferPtr = NULL; |
| 284 | } |
| 285 | |
| 286 | void GrBufferAllocPool::flushCpuData(GrGeometryBuffer* buffer, |
| 287 | size_t flushSize) { |
| 288 | GrAssert(NULL != buffer); |
| 289 | GrAssert(!buffer->isLocked()); |
| 290 | GrAssert(fCpuData.get() == fBufferPtr); |
| 291 | GrAssert(fCpuData.size() == buffer->size()); |
| 292 | GrAssert(flushSize <= buffer->size()); |
| 293 | |
| 294 | bool updated = false; |
| 295 | if (fGpu->supportsBufferLocking() && |
| 296 | flushSize > GR_GEOM_BUFFER_LOCK_THRESHOLD) { |
| 297 | void* data = buffer->lock(); |
| 298 | if (NULL != data) { |
| 299 | memcpy(data, fBufferPtr, flushSize); |
| 300 | buffer->unlock(); |
| 301 | updated = true; |
| 302 | } |
| 303 | } |
| 304 | buffer->updateData(fBufferPtr, flushSize); |
| 305 | } |
| 306 | |
| 307 | GrGeometryBuffer* GrBufferAllocPool::createBuffer(size_t size) { |
| 308 | if (kIndex_BufferType == fBufferType) { |
| 309 | return fGpu->createIndexBuffer(size, true); |
| 310 | } else { |
| 311 | GrAssert(kVertex_BufferType == fBufferType); |
| 312 | return fGpu->createVertexBuffer(size, true); |
| 313 | } |
| 314 | } |
| 315 | |
| 316 | //////////////////////////////////////////////////////////////////////////////// |
| 317 | |
| 318 | GrVertexBufferAllocPool::GrVertexBufferAllocPool(GrGpu* gpu, |
| 319 | bool frequentResetHint, |
| 320 | size_t bufferSize, |
| 321 | int preallocBufferCnt) |
| 322 | : GrBufferAllocPool(gpu, |
| 323 | kVertex_BufferType, |
| 324 | frequentResetHint, |
| 325 | bufferSize, |
| 326 | preallocBufferCnt) { |
| 327 | } |
| 328 | |
| 329 | void* GrVertexBufferAllocPool::makeSpace(GrVertexLayout layout, |
| 330 | int vertexCount, |
| 331 | const GrVertexBuffer** buffer, |
| 332 | int* startVertex) { |
| 333 | |
| 334 | GrAssert(vertexCount >= 0); |
| 335 | GrAssert(NULL != buffer); |
| 336 | GrAssert(NULL != startVertex); |
| 337 | |
| 338 | size_t vSize = GrDrawTarget::VertexSize(layout); |
| 339 | size_t offset; |
| 340 | const GrGeometryBuffer* geomBuffer; |
| 341 | void* ptr = INHERITED::makeSpace(vSize * vertexCount, |
| 342 | vSize, |
| 343 | &geomBuffer, |
| 344 | &offset); |
| 345 | |
| 346 | *buffer = (const GrVertexBuffer*) geomBuffer; |
| 347 | GrAssert(0 == offset % vSize); |
| 348 | *startVertex = offset / vSize; |
| 349 | return ptr; |
| 350 | } |
| 351 | |
| 352 | bool GrVertexBufferAllocPool::appendVertices(GrVertexLayout layout, |
| 353 | int vertexCount, |
| 354 | const void* vertices, |
| 355 | const GrVertexBuffer** buffer, |
| 356 | int* startVertex) { |
| 357 | void* space = makeSpace(layout, vertexCount, buffer, startVertex); |
| 358 | if (NULL != space) { |
| 359 | memcpy(space, |
| 360 | vertices, |
| 361 | GrDrawTarget::VertexSize(layout) * vertexCount); |
| 362 | return true; |
| 363 | } else { |
| 364 | return false; |
| 365 | } |
| 366 | } |
| 367 | |
| 368 | int GrVertexBufferAllocPool::preallocatedBufferVertices(GrVertexLayout layout) const { |
| 369 | return INHERITED::preallocatedBufferSize() / |
| 370 | GrDrawTarget::VertexSize(layout); |
| 371 | } |
| 372 | |
| 373 | int GrVertexBufferAllocPool::currentBufferVertices(GrVertexLayout layout) const { |
| 374 | return currentBufferItems(GrDrawTarget::VertexSize(layout)); |
| 375 | } |
| 376 | |
| 377 | //////////////////////////////////////////////////////////////////////////////// |
| 378 | |
| 379 | GrIndexBufferAllocPool::GrIndexBufferAllocPool(GrGpu* gpu, |
| 380 | bool frequentResetHint, |
| 381 | size_t bufferSize, |
| 382 | int preallocBufferCnt) |
| 383 | : GrBufferAllocPool(gpu, |
| 384 | kIndex_BufferType, |
| 385 | frequentResetHint, |
| 386 | bufferSize, |
| 387 | preallocBufferCnt) { |
| 388 | } |
| 389 | |
| 390 | void* GrIndexBufferAllocPool::makeSpace(int indexCount, |
| 391 | const GrIndexBuffer** buffer, |
| 392 | int* startIndex) { |
| 393 | |
| 394 | GrAssert(indexCount >= 0); |
| 395 | GrAssert(NULL != buffer); |
| 396 | GrAssert(NULL != startIndex); |
| 397 | |
| 398 | size_t offset; |
| 399 | const GrGeometryBuffer* geomBuffer; |
| 400 | void* ptr = INHERITED::makeSpace(indexCount * sizeof(uint16_t), |
| 401 | sizeof(uint16_t), |
| 402 | &geomBuffer, |
| 403 | &offset); |
| 404 | |
| 405 | *buffer = (const GrIndexBuffer*) geomBuffer; |
| 406 | GrAssert(0 == offset % sizeof(uint16_t)); |
| 407 | *startIndex = offset / sizeof(uint16_t); |
| 408 | return ptr; |
| 409 | } |
| 410 | |
| 411 | bool GrIndexBufferAllocPool::appendIndices(int indexCount, |
| 412 | const void* indices, |
| 413 | const GrIndexBuffer** buffer, |
| 414 | int* startIndex) { |
| 415 | void* space = makeSpace(indexCount, buffer, startIndex); |
| 416 | if (NULL != space) { |
| 417 | memcpy(space, indices, sizeof(uint16_t) * indexCount); |
| 418 | return true; |
| 419 | } else { |
| 420 | return false; |
| 421 | } |
| 422 | } |
| 423 | |
| 424 | int GrIndexBufferAllocPool::preallocatedBufferIndices() const { |
| 425 | return INHERITED::preallocatedBufferSize() / sizeof(uint16_t); |
| 426 | } |
| 427 | |
| 428 | int GrIndexBufferAllocPool::currentBufferIndices() const { |
| 429 | return currentBufferItems(sizeof(uint16_t)); |
| 430 | } |