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