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author | 2011-02-14 16:51:21 +0000 | |
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committer | 2011-02-14 16:51:21 +0000 | |
commit | 1c13c9668a889e56a0c85b51b9f28139c25b76ff (patch) | |
tree | 0319884473e77141a574ab07333c6ed4797f7485 /gpu/src/GrBufferAllocPool.h | |
parent | dd53d91b60e368f1bbff6fb22d796765205ae25d (diff) |
Refactor how Gr handles vertex and index data. GrGpu and GrInOrderDrawBuffer both GrBufferAllocPool to manage reserved and set-to-array vertex and index data.
rietveld issue 4188049
git-svn-id: http://skia.googlecode.com/svn/trunk@786 2bbb7eff-a529-9590-31e7-b0007b416f81
Diffstat (limited to 'gpu/src/GrBufferAllocPool.h')
-rw-r--r-- | gpu/src/GrBufferAllocPool.h | 349 |
1 files changed, 349 insertions, 0 deletions
diff --git a/gpu/src/GrBufferAllocPool.h b/gpu/src/GrBufferAllocPool.h new file mode 100644 index 0000000000..80f16ab122 --- /dev/null +++ b/gpu/src/GrBufferAllocPool.h @@ -0,0 +1,349 @@ +/* + Copyright 2010 Google Inc. + + Licensed under the Apache License, Version 2.0 (the "License"); + you may not use this file except in compliance with the License. + You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + + Unless required by applicable law or agreed to in writing, software + distributed under the License is distributed on an "AS IS" BASIS, + WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + See the License for the specific language governing permissions and + limitations under the License. + */ + + +#ifndef GrBufferAllocPool_DEFINED +#define GrBufferAllocPool_DEFINED + +#include "GrNoncopyable.h" +#include "GrTDArray.h" +#include "GrTArray.h" +#include "GrMemory.h" + +class GrGeometryBuffer; +class GrGpu; + +/** + * A pool of geometry buffers tied to a GrGpu. + * + * The pool allows a client to make space for geometry and then put back excess + * space if it over allocated. When a client is ready to draw from the pool + * it calls unlock on the pool ensure buffers are ready for drawing. The pool + * can be reset after drawing is completed to recycle space. + * + * At creation time a minimum per-buffer size can be specified. Additionally, + * a number of buffers to preallocate can be specified. These will + * be allocated at the min size and kept around until the pool is destroyed. + */ +class GrBufferAllocPool : GrNoncopyable { +protected: + + // We could make the createBuffer a virtual except that we want to use it + // in the cons for pre-allocated buffers. + enum BufferType { + kVertex_BufferType, + kIndex_BufferType, + }; + + /** + * Constructor + * + * @param gpu The GrGpu used to create the buffers. + * @param bufferType The type of buffers to create. + * @param frequentResetHint A hint that indicates that the pool + * should expect frequent unlock() calls + * (as opposed to many makeSpace / acquires + * between resets). + * @param bufferSize The minimum size of created buffers. + * This value will be clamped to some + * reasonable minimum. + * @param preallocBufferCnt The pool will allocate this number of + * buffers at bufferSize and keep them until it + * is destroyed. + */ + GrBufferAllocPool(GrGpu* gpu, + BufferType bufferType, + bool frequentResetHint, + size_t bufferSize = 0, + int preallocBufferCnt = 0); + + virtual ~GrBufferAllocPool(); + +public: + /** + * Ensures all buffers are unlocked and have all data written to them. + * Call before drawing using buffers from the pool. + */ + void unlock(); + + /** + * Invalidates all the data in the pool, unrefs non-preallocated buffers. + */ + void reset(); + + /** + * Gets the number of preallocated buffers that are yet to be used. + */ + int preallocatedBuffersRemaining() const; + + /** + * gets the number of preallocated buffers + */ + int preallocatedBufferCount() const; + + + /** + * Frees data from makeSpaces in LIFO order. + */ + void putBack(size_t bytes); + + /** + * Gets the GrGpu that this pool is associated with. + */ + GrGpu* getGpu() { return fGpu; } + +protected: + /** + * Gets the size of the preallocated buffers. + * + * @return the size of preallocated buffers. + */ + size_t preallocatedBufferSize() const { + return fPreallocBuffers.count() ? fMinBlockSize : 0; + } + + /** + * Returns a block of memory to hold data. A buffer designated to hold the + * data is given to the caller. The buffer may or may not be locked. The + * returned ptr remains valid until any of the following: + * *makeSpace is called again. + * *unlock is called. + * *reset is called. + * *this object is destroyed. + * + * Once unlock on the pool is called the data is guaranteed to be in the + * buffer at the offset indicated by offset. Until that time it may be + * in temporary storage and/or the buffer may be locked. + * + * @param size the amount of data to make space for + * @param alignment alignment constraint from start of buffer + * @param buffer returns the buffer that will hold the data. + * @param offset returns the offset into buffer of the data. + * @return pointer to where the client should write the data. + */ + void* makeSpace(size_t size, + size_t alignment, + const GrGeometryBuffer** buffer, + size_t* offset); + + /** + * Gets the number of items of a size that can be added to the current + * buffer without spilling to another buffer. If the pool has been reset, or + * the previous makeSpace completely exhausted a buffer then the returned + * size will be the size of the next available preallocated buffer, or zero + * if no preallocated buffer remains available. It is assumed that items + * should be itemSize-aligned from the start of a buffer. + * + * @return the number of items that would fit in the current buffer. + */ + int currentBufferItems(size_t itemSize) const; + + GrGeometryBuffer* createBuffer(size_t size); + +private: + + struct BufferBlock { + size_t fBytesFree; + GrGeometryBuffer* fBuffer; + }; + + bool createBlock(size_t requestSize); + void destroyBlock(); + void flushCpuData(GrGeometryBuffer* buffer, size_t flushSize); +#if GR_DEBUG + void validate() const; +#endif + + GrGpu* fGpu; + bool fFrequentResetHint; + GrTDArray<GrGeometryBuffer*> fPreallocBuffers; + size_t fMinBlockSize; + BufferType fBufferType; + + GrTArray<BufferBlock> fBlocks; + int fPreallocBuffersInUse; + int fFirstPreallocBuffer; + GrAutoMalloc fCpuData; + void* fBufferPtr; +}; + +class GrVertexBuffer; + +/** + * A GrBufferAllocPool of vertex buffers + */ +class GrVertexBufferAllocPool : public GrBufferAllocPool { +public: + /** + * Constructor + * + * @param gpu The GrGpu used to create the vertex buffers. + * @param frequentResetHint A hint that indicates that the pool + * should expect frequent unlock() calls + * (as opposed to many makeSpace / acquires + * between resets). + * @param bufferSize The minimum size of created VBs This value + * will be clamped to some reasonable minimum. + * @param preallocBufferCnt The pool will allocate this number of VBs at + * bufferSize and keep them until it is + * destroyed. + */ + GrVertexBufferAllocPool(GrGpu* gpu, + bool frequentResetHint, + size_t bufferSize = 0, + int preallocBufferCnt = 0); + + /** + * Returns a block of memory to hold vertices. A buffer designated to hold + * the vertices given to the caller. The buffer may or may not be locked. + * The returned ptr remains valid until any of the following: + * *makeSpace is called again. + * *unlock is called. + * *reset is called. + * *this object is destroyed. + * + * Once unlock on the pool is called the vertices are guaranteed to be in + * the buffer at the offset indicated by startVertex. Until that time they + * may be in temporary storage and/or the buffer may be locked. + * + * @param layout specifies type of vertices to allocate space for + * @param vertexCount number of vertices to allocate space for + * @param buffer returns the vertex buffer that will hold the + * vertices. + * @param startVertex returns the offset into buffer of the first vertex. + * In units of the size of a vertex from layout param. + * @return pointer to first vertex. + */ + void* makeSpace(GrVertexLayout layout, + int vertexCount, + const GrVertexBuffer** buffer, + int* startVertex); + + /** + * Shortcut to make space and then write verts into the made space. + */ + bool appendVertices(GrVertexLayout layout, + int vertexCount, + const void* vertices, + const GrVertexBuffer** buffer, + int* startVertex); + + /** + * Gets the number of vertices that can be added to the current VB without + * spilling to another VB. If the pool has been reset, or the previous + * makeSpace completely exhausted a VB then the returned number of vertices + * would fit in the next available preallocated buffer. If any makeSpace + * would force a new VB to be created the return value will be zero. + * + * @param the format of vertices to compute space for. + * @return the number of vertices that would fit in the current buffer. + */ + int currentBufferVertices(GrVertexLayout layout) const; + + /** + * Gets the number of vertices that can fit in a preallocated vertex buffer. + * Zero if no preallocated buffers. + * + * @param the format of vertices to compute space for. + * + * @return number of vertices that fit in one of the preallocated vertex + * buffers. + */ + int preallocatedBufferVertices(GrVertexLayout layout) const; + +private: + typedef GrBufferAllocPool INHERITED; +}; + +class GrIndexBuffer; + +/** + * A GrBufferAllocPool of index buffers + */ +class GrIndexBufferAllocPool : public GrBufferAllocPool { +public: + /** + * Constructor + * + * @param gpu The GrGpu used to create the index buffers. + * @param frequentResetHint A hint that indicates that the pool + * should expect frequent unlock() calls + * (as opposed to many makeSpace / acquires + * between resets). + * @param bufferSize The minimum size of created IBs This value + * will be clamped to some reasonable minimum. + * @param preallocBufferCnt The pool will allocate this number of VBs at + * bufferSize and keep them until it is + * destroyed. + */ + GrIndexBufferAllocPool(GrGpu* gpu, + bool frequentResetHint, + size_t bufferSize = 0, + int preallocBufferCnt = 0); + + /** + * Returns a block of memory to hold indices. A buffer designated to hold + * the indices is given to the caller. The buffer may or may not be locked. + * The returned ptr remains valid until any of the following: + * *makeSpace is called again. + * *unlock is called. + * *reset is called. + * *this object is destroyed. + * + * Once unlock on the pool is called the indices are guaranteed to be in the + * buffer at the offset indicated by startIndex. Until that time they may be + * in temporary storage and/or the buffer may be locked. + * + * @param indexCount number of indices to allocate space for + * @param buffer returns the index buffer that will hold the indices. + * @param startIndex returns the offset into buffer of the first index. + * @return pointer to first index. + */ + void* makeSpace(int indexCount, + const GrIndexBuffer** buffer, + int* startIndex); + + /** + * Shortcut to make space and then write indices into the made space. + */ + bool appendIndices(int indexCount, + const void* indices, + const GrIndexBuffer** buffer, + int* startIndex); + + /** + * Gets the number of indices that can be added to the current IB without + * spilling to another IB. If the pool has been reset, or the previous + * makeSpace completely exhausted a IB then the returned number of indices + * would fit in the next available preallocated buffer. If any makeSpace + * would force a new IB to be created the return value will be zero. + */ + int currentBufferIndices() const; + + /** + * Gets the number of indices that can fit in a preallocated index buffer. + * Zero if no preallocated buffers. + * + * @return number of indices that fit in one of the preallocated index + * buffers. + */ + int preallocatedBufferIndices() const; + +private: + typedef GrBufferAllocPool INHERITED; +}; + +#endif |