This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for usage in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the specification changes.
The WebGL2RenderingContext.getActiveUniforms()
method of the WebGL 2 API retrieves information about active uniforms within a WebGLProgram
.
Syntax
any gl.getActiveUniforms(program, uniformIndices, pname);
Parameters
program
- A
WebGLProgram
containing the active uniforms. uniformIndices
- An
Array
ofGLuint
specifying the indices of the active uniforms to query. pname
- A
GLenum
specifying which information to query. Possible values:gl.UNIFORM_TYPE
: Returns anArray
ofGLenum
indicating the types of the uniforms.gl.UNIFORM_SIZE
: Returns anArray
ofGLuint
indicating the sizes of the uniforms.gl.UNIFORM_BLOCK_INDEX
: Returns anArray
ofGLint
indicating the block indices of the uniforms.gl.UNIFORM_OFFSET
: Returns anArray
ofGLint
indicating the uniform buffer offsets.gl.UNIFORM_ARRAY_STRIDE
: Returns anArray
ofGLint
indicating the strides between the elements.gl.UNIFORM_MATRIX_STRIDE
: Returns anArray
ofGLint
indicating the strides between columns of a column-major matrix or a row-major matrix.gl.UNIFORM_IS_ROW_MAJOR
: Returns anArray
ofGLboolean
indicating whether each of the uniforms is a row-major matrix or not.
Return value
Depends on which information is requested using the pname
parameter.
Examples
var uniformIndices = gl.getUniformIndices(program, ["UBORed", "UBOGreen", "UBOBlue"]); var uniformOffsets = gl.getActiveUniforms(program, uniformIndices, gl.UNIFORM_OFFSET);
Specifications
Specification | Status | Comment |
---|---|---|
WebGL 2.0 The definition of 'getActiveUniforms' in that specification. |
Editor's Draft | Initial definition for WebGL. |
OpenGL ES 3.0 The definition of 'glGetActiveUniformsiv' in that specification. |
Standard | Man page of the (similar) OpenGL API. |
Browser compatibility
Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
---|---|---|---|---|---|
Basic support | No support [2] | Nightly build [1] | No support | No support | No support |
Feature | Android | Chrome for Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
---|---|---|---|---|---|---|
Basic support | No support | No support | No support | No support | No support | No support |
[1] WebGL 2 is enabled by default in Firefox Nightly. To enable it in a release version of Firefox, set the preference webgl.enable-prototype-webgl2
to true
in about:config.
[2] To use an experimental implementation of WebGL 2 in Chrome, you have to start Chrome with the runtime flag --enable-unsafe-es3-apis
.