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#ifndef VBO_H
#define VBO_H
#include <vector>
#include "../Utilities/UtilMacros.h"
#include "../Shaders/ShaderChannel.h"
#include "OpenGL.h"
#include "GpuDataBuffer.h"
enum VertexAttr
{
VertexAttr_Position = 0,
VertexAttr_Normal = 1,
VertexAttr_Tangent = 2,
VertexAttr_Color = 3,
VertexAttr_TexCoord0 = 4,
VertexAttr_TexCoord1 = 5,
VertexAttr_Count = 6
};
enum RenderMode
{
RenderMode_Triangle = 1,
RenderMode_Line = 2,
RenderMode_Point = 3,
};
struct VertexInputInfo
{
const void* pointer; // either cpu memory or gpu memory
uint componentType; // one of VertexAttrFormat
uint componentNum;
uint16 stride;
};
// gpu side vertex attributes array
struct VertexArrayInfo
{
uint32 enableMask;
GLuint buffers[VertexAttr_Count];
VertexInputInfo attributes[VertexAttr_Count];
};
class VertexBuffer
{
public:
enum VertexBufferType
{
VertexBufferType_Static, // device
VertexBufferType_Stream, // pinned (best performance)
VertexBufferType_Dynamic,// device
};
VertexBuffer(VertexBufferType type);
~VertexBuffer();
void Draw();
private:
VertexBufferType m_Type;
GPU::DataBuffer *m_VB, *m_IB;// vertex buffer and index buffer
};
class SharedVertexBuffer
{
public:
SharedVertexBuffer();
~SharedVertexBuffer();
void GetChunk(uint attrs, int maxVerts, int maxIndices, RenderMode mode, void **out_vb, void **out_ib);
void ReleaseChunk(int actualVerts, int actualIndices);
void DrawChunk();
private:
void FillVertexArrayInfo(VertexArrayInfo& dst);
void Clean();
// if vertex databuffer size beyond this value, use pinned memory mapping, instead of glBufferData.
enum { DataBufferThreshold = 1024 };
// shared vbo and ibo
GPU::DataBuffer *m_CurVB, *m_CurIB;
// restore vbo and ibo data if not using pinned memory mapping
std::vector<byte> m_CurVBData;
std::vector<uint16> m_CurIBData;
RenderMode m_CurRenderMode;
uint m_CurAttrMask;
uint m_CurStride;
uint m_CurVertexCount;
uint m_CurIndexCount;
};
#endif
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