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/* This file is part of the Spring engine (GPL v2 or later), see LICENSE.html */
#ifndef VBO_H
#define VBO_H
#include "Rendering/GL/myGL.h"
/**
* @brief VBO
*
* Vertex buffer Object class (ARB_vertex_buffer_object).
*/
class VBO
{
public:
VBO(GLenum defTarget = GL_ARRAY_BUFFER, const bool storage = false);
VBO(VBO&& other) { *this = std::move(other); }
virtual ~VBO();
VBO& operator=(VBO&& other);
bool IsSupported() const;
static bool IsVBOSupported();
static bool IsPBOSupported();
/**
* @param target can be either GL_ARRAY_BUFFER, GL_ELEMENT_ARRAY_BUFFER, GL_PIXEL_PACK_BUFFER, GL_PIXEL_UNPACK_BUFFER or GL_UNIFORM_BUFFER_EXT
* @see http://www.opengl.org/sdk/docs/man/xhtml/glBindBuffer.xml
*/
void Bind() const { Bind(defTarget); }
void Bind(GLenum target) const;
void Unbind() const;
/**
* @param usage can be either GL_STREAM_DRAW, GL_STREAM_READ, GL_STREAM_COPY, GL_STATIC_DRAW, GL_STATIC_READ, GL_STATIC_COPY, GL_DYNAMIC_DRAW, GL_DYNAMIC_READ, or GL_DYNAMIC_COPY
* @param data (optional) initialize the VBO with the data (the array must have minimum `size` length!)
* @see http://www.opengl.org/sdk/docs/man/xhtml/glBufferData.xml
*/
void Resize(GLsizeiptr size, GLenum usage = GL_STREAM_DRAW);
void New(GLsizeiptr size, GLenum usage = GL_STREAM_DRAW, const void* data = nullptr);
void Invalidate(); //< discards all current data (frees the memory w/o resizing)
/**
* @see http://www.opengl.org/sdk/docs/man/xhtml/glMapBufferRange.xml
*/
GLubyte* MapBuffer(GLbitfield access = GL_WRITE_ONLY);
GLubyte* MapBuffer(GLintptr offset, GLsizeiptr size, GLbitfield access = GL_WRITE_ONLY);
void UnmapBuffer();
GLuint GetId() const {
if (VBOused && (vboId == 0)) glGenBuffers(1, &vboId);
return vboId;
}
size_t GetSize() const { return size; }
const GLvoid* GetPtr(GLintptr offset = 0) const;
public:
mutable GLuint vboId;
size_t size;
mutable GLenum curBoundTarget;
GLenum defTarget;
GLenum usage;
public:
bool VBOused;
mutable bool bound;
bool mapped;
bool nullSizeMapped; //< Nvidia workaround
bool immutableStorage;
GLubyte* data;
};
#endif /* VBO_H */
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