hmi.graphics.opengl
Class GLVertexAttribute

java.lang.Object
  hmi.graphics.opengl.GLVertexAttribute

public class GLVertexAttribute
extends Object

The OpenGL counterpart of the VertexAttribute class for GMesh It stores attribute data in FloatBuffer format, ready for rendering operations.

Field Summary

private int	attribSize
private int	attributeIndex
private String	attributeName
private boolean	bufferModified
private int	bufferOffset
private int	byteBufferSize
private int	floatBufferSize
private int	nrOfVertices
private int	texUnit
private FloatBuffer	vertexDataBuffer

Constructor Summary

GLVertexAttribute(String attrName, float[] vertexData, int attribSize, int nrOfVertices, int texUnit)
Create a new GLVertexAttribute

GLVertexAttribute(VertexAttribute va)
Create a new GLVertexAttribute from a generic VertexAttribute

Method Summary

StringBuffer	appendTo(StringBuffer buf)
String	getAttributeName()
int	getByteBufferSize() Returns the buffer size, in number of bytes
String	getName() Returns the GLAttribute name.
int	getNrOfVertices() Returns the number of vertices
int	getTexUnit()
float[]	getVertexData(float[] vertexData) Fills and returns the vertexData float array with the current contents of the vertex data buffer.
void	glInit(GLBinding gl)
void	glRender(GLBinding gl) GL render for this attribute.
void	setArrayBufferOffset(int offset) Sets the GL_ARRAY_BUFFER buffer offset
int	setAttributeIndex(GLBinding gl, int prog) Sets the GLSL attribute index for the specified shader program, by queriying for the attribute location.
void	setTexUnit(int texUnit) Sets the texture unit to be used for this (texture) attribute
void	setVertexData(float[] vertexData) Sets vertex data, by copying from the specified array.
String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

attributeName

private String attributeName

attributeIndex

private int attributeIndex

texUnit

private int texUnit

vertexDataBuffer

private FloatBuffer vertexDataBuffer

floatBufferSize

private int floatBufferSize

byteBufferSize

private int byteBufferSize

attribSize

private int attribSize

bufferModified

private boolean bufferModified

bufferOffset

private int bufferOffset

nrOfVertices

private int nrOfVertices

Constructor Detail

GLVertexAttribute

public GLVertexAttribute(String attrName,
                         float[] vertexData,
                         int attribSize,
                         int nrOfVertices,
                         int texUnit)

Create a new GLVertexAttribute

GLVertexAttribute

public GLVertexAttribute(VertexAttribute va)

Create a new GLVertexAttribute from a generic VertexAttribute

Method Detail

getAttributeName

public String getAttributeName()

toString

public String toString()

Overrides:

toString in class Object

appendTo

public StringBuffer appendTo(StringBuffer buf)

setTexUnit

public void setTexUnit(int texUnit)

Sets the texture unit to be used for this (texture) attribute

getTexUnit

public int getTexUnit()

getName

public String getName()

Returns the GLAttribute name.

getNrOfVertices

public int getNrOfVertices()

Returns the number of vertices

getByteBufferSize

public int getByteBufferSize()

Returns the buffer size, in number of bytes

setArrayBufferOffset

public void setArrayBufferOffset(int offset)

Sets the GL_ARRAY_BUFFER buffer offset

setVertexData

public void setVertexData(float[] vertexData)

Sets vertex data, by copying from the specified array.

getVertexData

public float[] getVertexData(float[] vertexData)

Fills and returns the vertexData float array with the current contents of the vertex data buffer. The passed in vertexData array can be null, in which case a new float array is allocated.

setAttributeIndex

public int setAttributeIndex(GLBinding gl,
                             int prog)

Sets the GLSL attribute index for the specified shader program, by queriying for the attribute location. If the attribute name is not an active variable for this shader, the index is set to -1, which effectively disables this attribute for rendering. Returns the assigned attribute index.

glInit

public void glInit(GLBinding gl)

glRender

public void glRender(GLBinding gl)

GL render for this attribute. Basically, copies vertex data to the GL_ARRAY_BUFFER buffer, if data has been modified, and sets the gl vertex data pointer to the buffer data.