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| 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 #ifndef GrIndexBuffer_DEFINED |
| 12 #define GrIndexBuffer_DEFINED |
| 13 |
| 14 #include "GrGeometryBuffer.h" |
| 15 |
| 16 |
| 17 class GrIndexBuffer : public GrGeometryBuffer { |
| 18 public: |
| 19 static void ComputeScratchKey(size_t size, bool dynamic, GrScratchKey* key)
{ |
| 20 static const GrScratchKey::ResourceType kType = GrScratchKey::GenerateRe
sourceType(); |
| 21 |
| 22 GrScratchKey::Builder builder(key, kType, 2); |
| 23 |
| 24 builder[0] = SkToUInt(size); |
| 25 builder[1] = dynamic ? 1 : 0; |
| 26 } |
| 27 |
| 28 /** |
| 29 * Retrieves the maximum number of quads that could be rendered |
| 30 * from the index buffer (using kTriangles_GrPrimitiveType). |
| 31 * @return the maximum number of quads using full size of index buffer. |
| 32 */ |
| 33 int maxQuads() const { |
| 34 return static_cast<int>(this->gpuMemorySize() / (sizeof(uint16_t) * 6)); |
| 35 } |
| 36 protected: |
| 37 GrIndexBuffer(GrGpu* gpu, size_t gpuMemorySize, bool dynamic, bool cpuBacked
) |
| 38 : INHERITED(gpu, gpuMemorySize, dynamic, cpuBacked) { |
| 39 // We currently only make buffers scratch if they're both pow2 sized and
not cpuBacked. |
| 40 if (!cpuBacked && SkIsPow2(gpuMemorySize)) { |
| 41 GrScratchKey key; |
| 42 ComputeScratchKey(gpuMemorySize, dynamic, &key); |
| 43 this->setScratchKey(key); |
| 44 } |
| 45 } |
| 46 |
| 47 private: |
| 48 typedef GrGeometryBuffer INHERITED; |
| 49 }; |
| 50 |
| 51 #endif |
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