The
WebGLRenderingContext.getShaderPrecisionFormat()
method of
the WebGL API returns a new
WebGLShaderPrecisionFormat
object describing the range and precision for
the specified shader numeric format.
Syntax
WebGLShaderPrecisionFormat gl.getShaderPrecisionFormat(shaderType, precisionType);
Parameters
shaderType
- Either a
gl.FRAGMENT_SHADER
or agl.VERTEX_SHADER
. precisionType
- A precision type value. Either
gl.LOW_FLOAT
,gl.MEDIUM_FLOAT
,gl.HIGH_FLOAT
,gl.LOW_INT
,gl.MEDIUM_INT
, orgl.HIGH_INT
.
Return value
A WebGLShaderPrecisionFormat
object or null
, if an error
occurs.
Exceptions
gl.INVALID_ENUM
if the shader or precision types aren't recognized.gl.INVALID_OPERATION
if the shader compiler isn't supported.
Examples
The following code gets the precision format of a gl.VERTEX_SHADER
with a
gl.MEDIUM_FLOAT
precision type.
var canvas = document.getElementById('canvas');
var gl = canvas.getContext('webgl');
gl.getShaderPrecisionFormat(gl.VERTEX_SHADER, gl.MEDIUM_FLOAT);
// WebGLShaderPrecisionFormat { rangeMin: 127, rangeMax: 127, precision: 23 }
Specifications
Specification | Status | Comment |
---|---|---|
WebGL 1.0 The definition of 'getShaderPrecisionFormat' in that specification. |
Recommendation | Initial definition. |
OpenGL ES 2.0 The definition of 'glGetShaderPrecisionFormat' in that specification. |
Standard | Man page of the (similar) OpenGL API. |
Browser compatibility
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