opengl_vbo.c File Reference

Handles OpenGL vbos. More...

#include "log.h"
#include "opengl.h"

Go to the source code of this file.

Data Structures
struct	gl_vbo
	Contains the VBO. More...

Macros
#define	BUFFER_OFFSET(i)   ((char *)(sizeof(char) * (i)))

Enumerations
enum	gl_vboType { NGL_VBO_NULL , NGL_VBO_STREAM , NGL_VBO_DYNAMIC , NGL_VBO_STATIC }
	VBO types. More...

Functions
static gl_vbo *	gl_vboCreate (GLenum target, GLsizei size, const void *data, GLenum usage)
	Creates a VBO. More...
int	gl_initVBO (void)
	Initializes the OpenGL VBO subsystem. More...
void	gl_exitVBO (void)
	Exits the OpenGL VBO subsystem. More...
void	gl_vboData (gl_vbo *vbo, GLsizei size, const void *data)
	Reloads new data or grows the size of the vbo. More...
void	gl_vboSubData (gl_vbo *vbo, GLint offset, GLsizei size, const void *data)
	Loads some data into the VBO. More...
gl_vbo *	gl_vboCreateStream (GLsizei size, const void *data)
	Creates a stream vbo. More...
gl_vbo *	gl_vboCreateDynamic (GLsizei size, const void *data)
	Creates a dynamic vbo. More...
gl_vbo *	gl_vboCreateStatic (GLsizei size, const void *data)
	Creates a stream vbo. More...
void *	gl_vboMap (gl_vbo *vbo)
	Maps a buffer. More...
void	gl_vboUnmap (gl_vbo *vbo)
	Unmaps a buffer. More...
void	gl_vboActivateAttribOffset (gl_vbo *vbo, GLuint index, GLuint offset, GLint size, GLenum type, GLsizei stride)
	Activates a VBO's offset. More...
void	gl_vboDestroy (gl_vbo *vbo)
	Destroys a VBO. More...

Detailed Description

Handles OpenGL vbos.

Definition in file opengl_vbo.c.

Macro Definition Documentation

BUFFER_OFFSET

#define BUFFER_OFFSET

(

i

)

((char *)(sizeof(char) * (i)))

Taken from OpengL spec.

Definition at line 16 of file opengl_vbo.c.

Enumeration Type Documentation

gl_vboType

enum gl_vboType

VBO types.

Enumerator
NGL_VBO_NULL	No VBO type.
NGL_VBO_STREAM	VBO streaming type.
NGL_VBO_DYNAMIC	VBO dynamic type.
NGL_VBO_STATIC	VBO static type.

Definition at line 21 of file opengl_vbo.c.

Function Documentation

gl_exitVBO()

void gl_exitVBO

(

void

)

Exits the OpenGL VBO subsystem.

Definition at line 56 of file opengl_vbo.c.

gl_initVBO()

int gl_initVBO

(

void

)

Initializes the OpenGL VBO subsystem.

Returns

0 on success.

Definition at line 48 of file opengl_vbo.c.

gl_vboActivateAttribOffset()

void gl_vboActivateAttribOffset	(	gl_vbo *	vbo,
		GLuint	index,
		GLuint	offset,
		GLint	size,
		GLenum	type,
		GLsizei	stride
	)

Activates a VBO's offset.

Parameters

vbo	VBO to activate.
index	Index of generic vertex attribute.
offset	Offset (in bytes).
size	Specifies components per point.
type	Type of data (usually GL_FLOAT).
stride	Offset between consecutive points.

Definition at line 228 of file opengl_vbo.c.

gl_vboCreate()

static gl_vbo * gl_vboCreate ( GLenum  target, GLsizei  size, const void *  data, GLenum  usage  )

static

Creates a VBO.

Prototypes.

Parameters

target	Target to create to (usually GL_ARRAY_BUFFER).
size	Size of the buffer (in bytes).
data	The actual datat to use.
usage	Usage to use.

Returns

ID of the vbo.

Definition at line 69 of file opengl_vbo.c.

gl_vboCreateDynamic()

gl_vbo * gl_vboCreateDynamic	(	GLsizei	size,
		const void *	data
	)

Creates a dynamic vbo.

Parameters

size	Size of the dynamic vbo (multiply by sizeof(type)).
data	Data for the VBO.

Definition at line 164 of file opengl_vbo.c.

gl_vboCreateStatic()

gl_vbo * gl_vboCreateStatic	(	GLsizei	size,
		const void *	data
	)

Creates a stream vbo.

Parameters

size	Size of the stream vbo (multiply by sizeof(type)).
data	Data for the VBO.

Definition at line 181 of file opengl_vbo.c.

gl_vboCreateStream()

gl_vbo * gl_vboCreateStream	(	GLsizei	size,
		const void *	data
	)

Creates a stream vbo.

Parameters

size	Size of the stream vbo (multiply by sizeof(type)).
data	Data for the VBO.

Definition at line 147 of file opengl_vbo.c.

gl_vboData()

void gl_vboData	(	gl_vbo *	vbo,
		GLsizei	size,
		const void *	data
	)

Reloads new data or grows the size of the vbo.

Parameters

vbo	VBO to set new data of.
size	Size of new data.
data	New data.

Definition at line 100 of file opengl_vbo.c.

gl_vboDestroy()

void gl_vboDestroy

(

gl_vbo *

vbo

)

Destroys a VBO.

Parameters

vbo	VBO to destroy. (If NULL, function does nothing.)

Definition at line 248 of file opengl_vbo.c.

gl_vboMap()

void * gl_vboMap

(

gl_vbo *

vbo

)

Maps a buffer.

Parameters

vbo	VBO to map.

Returns

The data contained in the vbo.

Definition at line 198 of file opengl_vbo.c.

gl_vboSubData()

void gl_vboSubData	(	gl_vbo *	vbo,
		GLint	offset,
		GLsizei	size,
		const void *	data
	)

Loads some data into the VBO.

Parameters

vbo	VBO to load data into.
offset	Offset location of the data (in bytes).
size	Size of the data (in bytes).
data	Pointer to the data.

Definition at line 132 of file opengl_vbo.c.

gl_vboUnmap()

void gl_vboUnmap

(

gl_vbo *

vbo

)

Unmaps a buffer.

Parameters

vbo	VBO to unmap.

Definition at line 209 of file opengl_vbo.c.