Class vxlProgramManager

Constructor

vxlProgramManager(gl)

Presents a simple interface to communicate with a ESSL (GLSL) programThis class is responsible for creating, compiling and linking any ESSL program.It also has methods to query and set uniforms and attributes belonging to the programthat is being currently executed in the GPU

a vxlProgramManager maintains a database of the programs that have been linked to the GPU. This way, program switching is easier as it is not necessary to go through the compilation and linking process every time

The program manager simplifies working with ESSL programs. It providesget/set operations for attributes and uniforms and handles internally the location variablesof these elements which are required to operate with them in the GPU. In other wordsit hides gl.getAttribLocation and gl.getUniformLocation calls.

The program manager catches uniforms and only updates the GPU if needed.

The program manager is available through the pm attribute of vxlEngine

Parameters:

gl

Methods

.clearCache()

.disableAttribute(name)

Disables a vertex attribute array

Parameters:

Type	Name	Description
String	`name`	the name of the attribute array to disable

.enableAttribute(name)

Enables a vertex attribute array

Parameters:

Type	Name	Description
String	`name`	the name of the attribute array to enable

.getDefault(programID, uniformName)

Overrides defaults by hand

Parameters:

Type	Name	Description
	`programID`
	`uniformName`

.getUniform(the)

Returns a uniform value from the cache maintained by vxlProgramManager

Parameters:

Type	Name	Description
String	`the`	uniform id

.loadDefaults()

Loads the uniform defaults for the current program

.releaseProgram()

.setAttributePointer(name, numElements, type, norm, stride, offset)

This method tells the WebGL context how to access the information contained in theWebGL buffer associated with the attribute

Parameters:

Type	Name	Description
String	`name`	name of the attribute
	`numElements`
	`type`
	`norm`
	`stride`
	`offset`

.setDefault(programID, uniformName, value)

Overrides defaults by hand

Parameters:

Type	Name	Description
	`programID`
	`uniformName`
	`value`

.setProgram(p_program, p_force_it)

Tries to add a new program definition to this renderer

Parameters:

Type	Name	Description
vxlProgram	`p_program`	an instance of a vxlProgram object or one of its descendants
	`p_force_it`

.setUniform(p_uniform_id, p_value, hint)

Sets a uniform. Caches the uniform location.Uses polymorphism to make the programmers life happier

Parameters:

Type	Name	Description
String	`p_uniform_id`	name
Object	`p_value`	the uniform value
	`hint`

.setUniforms(p_dictionary)

Sets all the uniforms defined by the object obj

Parameters:

Type	Name	Description
Object	`p_dictionary`	an object containing uniform names and values. Every property of this objectwill be considered a uniform

.useProgram(ID)

Uses a program from the database.If you are not sure if the program you want to use is in the database then call vxlRenderer.setProgram instead

Parameters:

Type	Name	Description
String	`ID`	the program id

See:

vxlRenderer#setProgram