Class: V2_0

WebGLModule.DataLoader.V2_0

Members Methods

new V2_0()

Data loader for WebGL 2.0. Must load the data to a Texture2DArray. The name of the texture is a constant. The order od the textures in the z-stacking is defined in dataIndexMapping. For details, please, see the implementation.
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Members

loadersByType

Loader strategy based on toString result, extend with your type if necessary. If your type cannot use the given version strategy (TEXTURE_2D_ARRAY UNIT), you have to re-define the whole API.
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Methods

declare(indicesOfImages) → {string}

Declare elements in shader
Parameters:
Name Type Description
indicesOfImages Array.<number> mapping of shader to data index, i.e. if shader requests texture i, the texture is located in the data at indicesOfImages[i] index
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Returns:
GLSL declaration (terminated with semicolon) of necessary elements for textures
Type
string

measure(index) → {string}

Measure texture size
Parameters:
Name Type Description
index number index of the texture
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Returns:
GLSL expression (unterminated) to obtain texture size - vec2
Type
string

sample(index, vec2coords) → {string}

Sample texture
Parameters:
Name Type Description
index number | string texture index, must respect index re-mapping (see declare())
vec2coords string GLSL expression that evaluates to vec2
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Returns:
GLSL expression (unterminated) that evaluates to vec4
Type
string

toCanvas(context, dataIndexMapping, visualization, data, tileBounds, program, gl)

Called when tile is processed
Parameters:
Name Type Description
context WebGLModule context renderer reference
dataIndexMapping array mapping of array indices to data indices, e.g. texture 0 for this shader corresponds to index dataIndexMapping[0] in the data array, -1 value used for textures not loaded
visualization object reference to the current active visualization object
data * data object, must contain all the data listed in WebGLModule.prototype.getSources() in the respective order, dataIndexMapping then points with index to this data; by default an Image object
tileBounds object tile size in pixels
Properties
Name Type Description
width number tile width
height number tile height
program WebGLProgram current WebGLProgram
gl WebGL2RenderingContext
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toCanvasFinish(context, dataIndexMapping, visualization, data, tileBounds, program, gl)

Parameters:
Name Type Description
context
dataIndexMapping
visualization
data
tileBounds
program
gl
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(static) toBuffers(context, gl, wrap, filter, visualization)

Called when the program is being loaded (set as active)
Parameters:
Name Type Description
context WebGLModule
gl WebGL2RenderingContext WebGL context
wrap GLint required texture GL wrap value
filter GLint required texture GL filter value
visualization object reference to the visualization object
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