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/* This file is part of the Spring engine (GPL v2 or later), see LICENSE.html */
#ifndef GL_VBO_H
#define GL_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, bool readable = false);
VBO(const VBO& other) = delete;
VBO(VBO&& other) { *this = std::move(other); }
virtual ~VBO() { assert(vboId == 0); }
VBO& operator=(const VBO& other) = delete;
VBO& operator=(VBO&& other) noexcept;
// NOTE: if declared in global scope, user has to call these before exit
void Release() {
UnmapIf();
Delete();
}
void Generate() const;
void Delete() const;
/**
* @param target can be either GL_ARRAY_BUFFER, GL_ELEMENT_ARRAY_BUFFER, GL_PIXEL_PACK_BUFFER, GL_PIXEL_UNPACK_BUFFER or GL_UNIFORM_BUFFER
* @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
*/
bool Resize(GLsizeiptr newSize, GLenum newUsage = GL_STREAM_DRAW);
bool New(GLsizeiptr newSize, GLenum newUsage = GL_STREAM_DRAW, const void* newData = 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();
void UnmapIf() {
if (!mapped)
return;
Bind();
UnmapBuffer();
Unbind();
}
GLuint GetId() const {
if (vboId == 0)
Generate();
return vboId;
}
size_t GetSize() const { return bufSize; }
const GLvoid* GetPtr(GLintptr offset = 0) const;
public:
mutable GLuint vboId = 0;
size_t bufSize = 0; // can be smaller than memSize
size_t memSize = 0; // actual length of <data>; only set when !isSupported
mutable GLenum curBoundTarget = 0;
GLenum defTarget = GL_ARRAY_BUFFER;
GLenum usage = GL_STREAM_DRAW;
GLuint mapUnsyncedBit = 0;
public:
mutable bool bound = false;
bool mapped = false;
bool nullSizeMapped = false; // Nvidia workaround
bool immutableStorage = false;
bool readableStorage = false;
};
#endif /* VBO_H */
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