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Aquaria/BBGE/VertexBuffer.h

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#ifndef BBGE_VERTEXBUFFER_H
#define BBGE_VERTEXBUFFER_H
#include <stdlib.h> // size_t
struct TexCoordBox;
enum BufUsage
{
// binding point
GPUBUF_VERTEXBUF = 0x00,
GPUBUF_INDEXBUF = 0x01,
GPUBUF_BINDING_MASK = 0x01,
// usage
GPUBUF_DYNAMIC = 0x00,
GPUBUF_STATIC = 0x10
};
enum BufDataType
{
GPUBUFTYPE_NONE = 0,
/* ccoossnt --
^-- type of each scalar
^-- number of coordinate scalars (eg. xyz would be 3)
^^-- stride (distance to next vertex), in bytes
^^-- offset of texcoords, in bytes, if present
^^-- offset of colors, if present */
GPUBUFTYPE_U16 = 0x00000010, // densely packed u16, for indexing
GPUBUFTYPE_VEC2_TC = 0x00081021, // xyuv xyuv xyuv
GPUBUFTYPE_VEC2_TC_RGBA = 0x10082021, // xyuvrgba xyuvrgba xyuvrgba
// ccoossnt
GPUBUFTYPE_VEC2_TC_RGBA_BUT_NO_COLOR = GPUBUFTYPE_VEC2_TC_RGBA & 0xffffff
};
enum AccessFlags
{
// Use whatever works. May directly map in GPU memory so that there is no
// copy on the host; or if there is a previous copy, it may remain untouched.
GPUACCESS_DEFAULT = 0x00,
// Don't use memory mapping. Prepare buffer on the host and upload it in one go.
// The copy remains on the host.
GPUACCESS_HOSTCOPY = 0x01
};
class DynamicGPUBuffer
{
public:
static void StaticInit();
DynamicGPUBuffer(unsigned usage);
~DynamicGPUBuffer();
void dropBuffer();
size_t size() const { return _size; }
// beginWrite(), then write exactly newsize bytes, then commit
void *beginWrite(BufDataType type, size_t newsize, unsigned access); // AccessFlags
bool commitWrite(); // used same size as passed to beginWrite()
bool commitWrite(size_t used); // explicitly specify used size (may be less than initially requested)
void upload(BufDataType type, const void *data, size_t size);
// uses own data for indexing and prev. applied buffer for the data to draw
void drawElements(unsigned glmode, size_t n, size_t first = 0) const;
void apply(BufDataType usetype = GPUBUFTYPE_NONE) const;
// Inteded for use with DrawArrays(4) and GL_TRIANGLE_FAN or GL_QUADS (both work)
void initQuadVertices(const TexCoordBox& tc, unsigned access);
// Init indices for drawing a grid, like this 4x3 grid:
// 0---1---2---3
// | | | |
// 4---5---6---7
// | | | |
// 8---9---10--11
// Returns the number of triangles to use with GL_TRIANGLES.
// Pass invert==true to draw from bottom to top.
size_t initGridIndices_Triangles(size_t w, size_t h, bool invert, unsigned access);
private:
void* _allocBytes(size_t bytes);
void* _ensureBytes(size_t bytes);
unsigned _ensureDBuf();
bool _commitWrite(size_t used);
unsigned _bufid;
unsigned _gl_binding;
size_t _size;
size_t _h_cap;
void *_h_data;
size_t _d_cap;
void *_d_map;
const unsigned _gl_usage;
const unsigned _usage;
BufDataType _datatype;
static bool _HasARB;
DynamicGPUBuffer(const DynamicGPUBuffer&); // no copy
DynamicGPUBuffer& operator=(const DynamicGPUBuffer&); // no assign
};
#endif // BBGE_VERTEXBUFFER_H