100 lines
3.1 KiB
C++
Executable File
100 lines
3.1 KiB
C++
Executable File
///////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// Name: VertexBuffer.h
|
|
// Author: Rich Cross
|
|
// Contact: rich@wildfiregames.com
|
|
//
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
|
|
#ifndef _VERTEXBUFFER_H
|
|
#define _VERTEXBUFFER_H
|
|
|
|
#include "lib.h"
|
|
#include "res/tex.h"
|
|
|
|
#include <list>
|
|
#include <vector>
|
|
|
|
// absolute maximum (bytewise) size of each GL vertex buffer object
|
|
#define MAX_VB_SIZE_BYTES (32*8192)
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
// CVertexBuffer: encapsulation of ARB_vertex_buffer_object, also supplying
|
|
// some additional functionality for batching and sharing buffers between
|
|
// multiple objects
|
|
class CVertexBuffer
|
|
{
|
|
public:
|
|
// Batch: batch definition - defines indices into the VB to use when rendering,
|
|
// and the texture used when doing so
|
|
struct Batch {
|
|
// list of indices into the vertex buffer of primitives within the batch
|
|
std::vector<std::pair<size_t,u16*> > m_IndexData;
|
|
// texture to apply when rendering batch
|
|
Handle m_Texture;
|
|
};
|
|
|
|
// VBChunk: describes a portion of this vertex buffer
|
|
struct VBChunk
|
|
{
|
|
// owning buffer
|
|
CVertexBuffer* m_Owner;
|
|
// start index of this chunk in owner
|
|
size_t m_Index;
|
|
// number of vertices used by chunk
|
|
size_t m_Count;
|
|
};
|
|
|
|
public:
|
|
// constructor, destructor
|
|
CVertexBuffer(size_t vertexSize,bool dynamic);
|
|
~CVertexBuffer();
|
|
|
|
// bind to this buffer; return pointer to address required as parameter
|
|
// to glVertexPointer ( + etc) calls
|
|
u8* Bind();
|
|
|
|
// clear lists of all batches
|
|
void ClearBatchIndices();
|
|
|
|
// add a batch to the render list for this buffer
|
|
void AppendBatch(VBChunk* chunk,Handle texture,size_t numIndices,u16* indices);
|
|
|
|
// update vertex data for given chunk
|
|
void UpdateChunkVertices(VBChunk* chunk,void* data);
|
|
|
|
// return this VBs batch list
|
|
const std::vector<Batch*>& GetBatches() const { return m_Batches; }
|
|
|
|
protected:
|
|
friend class CVertexBufferManager; // allow allocate only via CVertexBufferManager
|
|
|
|
// try to allocate a buffer of given number of vertices (each of given size),
|
|
// and with the given type - return null if no free chunks available
|
|
VBChunk* Allocate(size_t vertexSize,size_t numVertices,bool dynamic);
|
|
// return given chunk to this buffer
|
|
void Release(VBChunk* chunk);
|
|
|
|
|
|
private:
|
|
// set of all possible batches that can be used by this VB
|
|
std::vector<Batch*> m_Batches;
|
|
// vertex size of this vertex buffer
|
|
size_t m_VertexSize;
|
|
// number of vertices of above size in this buffer
|
|
size_t m_MaxVertices;
|
|
// list of free chunks in this buffer
|
|
std::list<VBChunk*> m_FreeList;
|
|
// available free vertices - total of all free vertices in the free list
|
|
size_t m_FreeVertices;
|
|
// handle to the actual GL vertex buffer object
|
|
GLuint m_Handle;
|
|
// raw system memory for systems not supporting VBOs
|
|
u8* m_SysMem;
|
|
// type of the buffer - dynamic?
|
|
bool m_Dynamic;
|
|
// list of all spare batches, shared between all vbs
|
|
static std::vector<Batch*> m_FreeBatches;
|
|
};
|
|
|
|
#endif |