OpenLIME

Class: Shader

Shader

Shader module provides WebGL shader program management for OpenLIME. Supports both WebGL 1.0 and 2.0/3.0 GLSL specifications with automatic version detection.

Shader class manages WebGL shader programs. Features:

  • GLSL/ES 2.0 and 3.0 support
  • Automatic uniform management
  • Multiple shader modes
  • Filter pipeline
  • Automatic version selection

new Shader( [options])

Creates a new Shader instance.

Parameters:
Name Type Argument Description
options Object <optional>

Configuration options

Properties
Name Type Argument Default Description
samplers Array.<Shader~Sampler> <optional>
 []

Texture sampler definitions
uniforms Object.<string, Object> <optional>
 {}

Shader uniform variables
label string <optional>
 null

Display label for the shader
modes Array.<string> <optional>
 []

Available shader modes
version number <optional>
 100

GLSL version (100 for WebGL1, 300 for WebGL2)
debug boolean <optional>
 false

Enable debug output
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Methods

addFilter(filter)

Adds a filter to the shader pipeline.

Parameters:
Name Type Description
filter Object

Filter to add
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allUniforms()

Returns all uniform variables associated with the shader and its filters. Combines uniforms from both the base shader and all active filters into a single object.

Source:
Returns:

Combined uniform variables

Type
Object.<string, Object>

clearFilters()

Clears all filters from the shader pipeline.

Source:
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<abstract> fragShaderSrc(gl)

Gets fragment shader source code. Must be overridden in derived classes for custom shading.

Parameters:
Name Type Description
gl WebGLRenderingContext

WebGL context
Source:
Returns:

Fragment shader source code

Type
string

getUniform(name)

Gets a uniform variable by name. Searches both shader uniforms and filter uniforms.

Parameters:
Name Type Description
name string

Uniform variable name
Source:
Returns:

Uniform object if found

Type
Object | undefined

removeFilter(name)

Removes a filter from the pipeline by name.

Parameters:
Name Type Description
name string

Name of filter to remove
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setMode(mode)

Sets the current shader mode.

Parameters:
Name Type Description
mode string

Mode identifier (must be in options.modes)
Source:
Throws:

If mode is not recognized

Type
Error

setTileSize(size)

Sets tile dimensions for shader calculations.

Parameters:
Name Type Description
size Array.<number>

[width, height] of tile
Source:

setUniform(name, value)

Sets a uniform variable value.

Parameters:
Name Type Description
name string

Uniform variable name
value number | boolean | Array

Value to set
Source:
Fires:
Throws:

If uniform doesn't exist

Type
Error

vertShaderSrc(gl)

Gets vertex shader source code. Default implementation provides basic vertex transformation and texture coordinate passing.

Parameters:
Name Type Description
gl WebGLRenderingContext

WebGL context
Source:
Returns:

Vertex shader source code

Type
string

Type Definitions

Sampler

A reference to a 2D texture used in the shader.

Type:
  • Object
Properties:
Name Type Argument Default Description
id number

Unique identifier for the sampler
name string

Sampler variable name in shader program (e.g., "kd" for diffuse texture)
label string

Display label for UI/menus
samplers Array.<Object>

Array of raster definitions
samplers[].id number

Raster identifier
samplers[].type string

Raster type (e.g., 'color', 'normal')
samplers[].bind boolean <optional>
 true

Whether sampler should be bound in prepareGL
samplers[].load boolean <optional>
 true

Whether sampler should load from raster
uniforms Array.<Object>

Shader uniform variables
uniforms[].type string

Data type ('vec4'|'vec3'|'vec2'|'float'|'int')
uniforms[].needsUpdate boolean

Whether uniform needs GPU update
uniforms[].value number

Uniform value or array of values
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Events

update

Fired when shader state changes (uniforms, filters, etc).

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