WebGLRenderingContext.getParameter()

The WebGLRenderingContext.getParameter() method of the WebGL API returns a value for the passed parameter name.

Syntax

any gl.getParameter(pname);

Parameters

pname
A GLenum specifying which parameter value to return. See below for possible values.

Return value

Depends on the parameter.

Parameter names

WebGL 1

You can query the following pname parameters when using a WebGLRenderingContext.

Constant Returned type Description
gl.ACTIVE_TEXTURE GLenum
gl.ALIASED_LINE_WIDTH_RANGE Float32Array (with 2 elements)
gl.ALIASED_POINT_SIZE_RANGE Float32Array (with 2 elements)
gl.ALPHA_BITS GLint
gl.ARRAY_BUFFER_BINDING WebGLBuffer
gl.BLEND GLboolean
gl.BLEND_COLOR Float32Array (with 4 values)
gl.BLEND_DST_ALPHA GLenum
gl.BLEND_DST_RGB GLenum
gl.BLEND_EQUATION GLenum
gl.BLEND_EQUATION_ALPHA GLenum
gl.BLEND_EQUATION_RGB GLenum
gl.BLEND_SRC_ALPHA GLenum
gl.BLEND_SRC_RGB GLenum
gl.BLUE_BITS GLint
gl.COLOR_CLEAR_VALUE Float32Array (with 4 values)
gl.COLOR_WRITEMASK sequence<GLboolean> (with 4 values)
gl.COMPRESSED_TEXTURE_FORMATS Uint32Array Returns the compressed texture formats.

When using the WEBGL_compressed_texture_s3tc extension:
  • ext.COMPRESSED_RGB_S3TC_DXT1_EXT
  • ext.COMPRESSED_RGBA_S3TC_DXT1_EXT
  • ext.COMPRESSED_RGBA_S3TC_DXT3_EXT
  • ext.COMPRESSED_RGBA_S3TC_DXT5_EXT

When using the WEBGL_compressed_texture_s3tc_srgb extension:

  • ext.COMPRESSED_SRGB_S3TC_DXT1_EXT
  • ext.COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT
  • ext.COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT
  • ext.COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT
When using the WEBGL_compressed_texture_etc extension:
  • ext.COMPRESSED_R11_EAC
  • ext.COMPRESSED_SIGNED_R11_EAC
  • ext.COMPRESSED_RG11_EAC
  • ext.COMPRESSED_SIGNED_RG11_EAC
  • ext.COMPRESSED_RGB8_ETC2
  • ext.COMPRESSED_RGBA8_ETC2_EAC
  • ext.COMPRESSED_SRGB8_ETC2
  • ext.COMPRESSED_SRGB8_ALPHA8_ETC2_EAC
  • ext.COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2
  • ext.COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2
When using the WEBGL_compressed_texture_pvrtc extension:
  • ext.COMPRESSED_RGB_PVRTC_4BPPV1_IMG
  • ext.COMPRESSED_RGBA_PVRTC_4BPPV1_IMG
  • ext.COMPRESSED_RGB_PVRTC_2BPPV1_IMG
  • ext.COMPRESSED_RGBA_PVRTC_2BPPV1_IMG
When using the WEBGL_compressed_texture_etc1 extension:
  • ext.COMPRESSED_RGB_ETC1_WEBGL
When using the WEBGL_compressed_texture_astc extension:
  • ext.COMPRESSED_RGBA_ASTC_4x4_KHR
  • ext.COMPRESSED_SRGB8_ALPHA8_ASTC_4x4_KHR
  • ext.COMPRESSED_RGBA_ASTC_5x4_KHR
  • ext.COMPRESSED_SRGB8_ALPHA8_ASTC_5x4_KHR
  • ext.COMPRESSED_RGBA_ASTC_5x5_KHR
  • ext.COMPRESSED_SRGB8_ALPHA8_ASTC_5x5_KHR
  • ext.COMPRESSED_RGBA_ASTC_6x5_KHR
  • ext.COMPRESSED_SRGB8_ALPHA8_ASTC_6x5_KHR
  • ext.COMPRESSED_RGBA_ASTC_6x6_KHR
  • ext.COMPRESSED_SRGB8_ALPHA8_ASTC_6x6_KHR
  • ext.COMPRESSED_RGBA_ASTC_8x5_KHR
  • ext.COMPRESSED_SRGB8_ALPHA8_ASTC_8x5_KHR
  • ext.COMPRESSED_RGBA_ASTC_8x6_KHR
  • ext.COMPRESSED_SRGB8_ALPHA8_ASTC_8x6_KHR
  • ext.COMPRESSED_RGBA_ASTC_8x8_KHR
  • ext.COMPRESSED_SRGB8_ALPHA8_ASTC_8x8_KHR
  • ext.COMPRESSED_RGBA_ASTC_10x5_KHR
  • ext.COMPRESSED_SRGB8_ALPHA8_ASTC_10x5_KHR
  • ext.COMPRESSED_RGBA_ASTC_10x6_KHR
  • ext.COMPRESSED_SRGB8_ALPHA8_ASTC_10x6_KHR
  • ext.COMPRESSED_RGBA_ASTC_10x6_KHR
  • ext.COMPRESSED_SRGB8_ALPHA8_ASTC_10x6_KHR
  • ext.COMPRESSED_RGBA_ASTC_10x10_KHR
  • ext.COMPRESSED_SRGB8_ALPHA8_ASTC_10x10_KHR
  • ext.COMPRESSED_RGBA_ASTC_12x10_KHR
  • ext.COMPRESSED_SRGB8_ALPHA8_ASTC_12x10_KHR
  • ext.COMPRESSED_RGBA_ASTC_12x12_KHR
  • ext.COMPRESSED_SRGB8_ALPHA8_ASTC_12x12_KHR
gl.CULL_FACE GLboolean
gl.CULL_FACE_MODE GLenum gl.FRONT, gl.BACK or gl.FRONT_AND_BACK. See also cullFace
gl.CURRENT_PROGRAM WebGLProgram or null See useProgram.
gl.DEPTH_BITS GLint
gl.DEPTH_CLEAR_VALUE GLfloat
gl.DEPTH_FUNC GLenum
gl.DEPTH_RANGE Float32Array (with 2 elements)
gl.DEPTH_TEST GLboolean
gl.DEPTH_WRITEMASK GLboolean
gl.DITHER GLboolean
gl.ELEMENT_ARRAY_BUFFER_BINDING WebGLBuffer
gl.FRAMEBUFFER_BINDING WebGLFramebuffer or null null corresponds to a binding to the default framebuffer. See also bindFramebuffer.
gl.FRONT_FACE GLenum gl.CW or gl.CCW. See also frontFace.
gl.GENERATE_MIPMAP_HINT GLenum gl.FASTEST, gl.NICEST or gl.DONT_CARE. See also hint.
gl.GREEN_BITS GLint
gl.IMPLEMENTATION_COLOR_READ_FORMAT GLenum
gl.IMPLEMENTATION_COLOR_READ_TYPE GLenum
gl.LINE_WIDTH GLfloat
gl.MAX_COMBINED_TEXTURE_IMAGE_UNITS GLint
gl.MAX_CUBE_MAP_TEXTURE_SIZE GLint
gl.MAX_FRAGMENT_UNIFORM_VECTORS GLint
gl.MAX_RENDERBUFFER_SIZE GLint
gl.MAX_TEXTURE_IMAGE_UNITS GLint
gl.MAX_TEXTURE_SIZE GLint
gl.MAX_VARYING_VECTORS GLint
gl.MAX_VERTEX_ATTRIBS GLint
gl.MAX_VERTEX_TEXTURE_IMAGE_UNITS GLint
gl.MAX_VERTEX_UNIFORM_VECTORS GLint
gl.MAX_VIEWPORT_DIMS Int32Array (with 2 elements)
gl.PACK_ALIGNMENT GLint
gl.POLYGON_OFFSET_FACTOR GLfloat
gl.POLYGON_OFFSET_FILL GLboolean
gl.POLYGON_OFFSET_UNITS GLfloat
gl.RED_BITS GLint
gl.RENDERBUFFER_BINDING WebGLRenderbuffer or null See bindRenderbuffer.
gl.RENDERER DOMString
gl.SAMPLE_BUFFERS GLint
gl.SAMPLE_COVERAGE_INVERT GLboolean
gl.SAMPLE_COVERAGE_VALUE GLfloat
gl.SAMPLES GLint
gl.SCISSOR_BOX Int32Array (with 4 elements)
gl.SCISSOR_TEST GLboolean
gl.SHADING_LANGUAGE_VERSION DOMString
gl.STENCIL_BACK_FAIL GLenum
gl.STENCIL_BACK_FUNC GLenum
gl.STENCIL_BACK_PASS_DEPTH_FAIL GLenum
gl.STENCIL_BACK_PASS_DEPTH_PASS GLenum
gl.STENCIL_BACK_REF GLint
gl.STENCIL_BACK_VALUE_MASK GLuint
gl.STENCIL_BACK_WRITEMASK GLuint
gl.STENCIL_BITS GLint
gl.STENCIL_CLEAR_VALUE GLint
gl.STENCIL_FAIL GLenum
gl.STENCIL_FUNC GLenum
gl.STENCIL_PASS_DEPTH_FAIL GLenum
gl.STENCIL_PASS_DEPTH_PASS GLenum
gl.STENCIL_REF GLint
gl.STENCIL_TEST GLboolean
gl.STENCIL_VALUE_MASK GLuint
gl.STENCIL_WRITEMASK GLuint
gl.SUBPIXEL_BITS GLint
gl.TEXTURE_BINDING_2D WebGLTexture or null
gl.TEXTURE_BINDING_CUBE_MAP WebGLTexture or null
gl.UNPACK_ALIGNMENT GLint
gl.UNPACK_COLORSPACE_CONVERSION_WEBGL GLenum
gl.UNPACK_FLIP_Y_WEBGL GLboolean
gl.UNPACK_PREMULTIPLY_ALPHA_WEBGL GLboolean
gl.VENDOR DOMString
gl.VERSION DOMString
gl.VIEWPORT Int32Array (with 4 elements)

WebGL 2

You can query the following pname parameters when using a WebGL2RenderingContext.

Constant Returned type Description
gl.COPY_READ_BUFFER_BINDING WebGLBuffer or null See bindBuffer.
gl.COPY_WRITE_BUFFER_BINDING WebGLBuffer or null See bindBuffer.
gl.DRAW_BUFFERi GLenum gl.BACK, gl.NONE or gl.COLOR_ATTACHMENT{0-15}. See also drawBuffers.
gl.DRAW_FRAMEBUFFER_BINDING WebGLFramebuffer or null null corresponds to a binding to the default framebuffer. See also bindFramebuffer.
gl.FRAGMENT_SHADER_DERIVATIVE_HINT GLenum gl.FASTEST, gl.NICEST or gl.DONT_CARE. See also hint.
gl.MAX_3D_TEXTURE_SIZE GLint
gl.MAX_ARRAY_TEXTURE_LAYERS GLint
gl.MAX_CLIENT_WAIT_TIMEOUT_WEBGL GLint64
gl.MAX_COLOR_ATTACHMENTS GLint
gl.MAX_COMBINED_FRAGMENT_UNIFORM_COMPONENTS GLint64
gl.MAX_COMBINED_UNIFORM_BLOCKS GLint
gl.MAX_COMBINED_VERTEX_UNIFORM_COMPONENTS GLint64
gl.MAX_DRAW_BUFFERS GLint
gl.MAX_ELEMENT_INDEX GLint64
gl.MAX_ELEMENTS_INDICES GLint
gl.MAX_ELEMENTS_VERTICES GLint
gl.MAX_FRAGMENT_INPUT_COMPONENTS GLint
gl.MAX_FRAGMENT_UNIFORM_BLOCKS GLint
gl.MAX_FRAGMENT_UNIFORM_COMPONENTS GLint
gl.MAX_PROGRAM_TEXEL_OFFSET GLint
gl.MAX_SAMPLES GLint
gl.MAX_SERVER_WAIT_TIMEOUT GLint64
gl.MAX_TEXTURE_LOD_BIAS GLfloat
gl.MAX_TRANSFORM_FEEDBACK_INTERLEAVED_COMPONENTS GLint
gl.MAX_TRANSFORM_FEEDBACK_SEPARATE_ATTRIBS GLint
gl.MAX_TRANSFORM_FEEDBACK_SEPARATE_COMPONENTS GLint
gl.MAX_UNIFORM_BLOCK_SIZE GLint64
gl.MAX_UNIFORM_BUFFER_BINDINGS GLint
gl.MAX_VARYING_COMPONENTS GLint
gl.MAX_VERTEX_OUTPUT_COMPONENTS GLint
gl.MAX_VERTEX_UNIFORM_BLOCKS GLint
gl.MAX_VERTEX_UNIFORM_COMPONENTS GLint
gl.MIN_PROGRAM_TEXEL_OFFSET GLint
gl.PACK_ROW_LENGTH GLint See pixelStorei.
gl.PACK_SKIP_PIXELS GLint See pixelStorei.
gl.PACK_SKIP_ROWS GLint See pixelStorei.
gl.PIXEL_PACK_BUFFER_BINDING WebGLBuffer or null See bindBuffer.
gl.PIXEL_UNPACK_BUFFER_BINDING WebGLBuffer or null See bindBuffer.
gl.RASTERIZER_DISCARD GLboolean
gl.READ_BUFFER GLenum
gl.READ_FRAMEBUFFER_BINDING WebGLFramebuffer or null null corresponds to a binding to the default framebuffer. See also bindFramebuffer.
gl.SAMPLE_ALPHA_TO_COVERAGE GLboolean
gl.SAMPLE_COVERAGE GLboolean
gl.SAMPLER_BINDING WebGLSampler or null See bindSampler.
gl.TEXTURE_BINDING_2D_ARRAY WebGLTexture or null See bindTexture.
gl.TEXTURE_BINDING_3D WebGLTexture or null See bindTexture.
gl.TRANSFORM_FEEDBACK_ACTIVE GLboolean
gl.TRANSFORM_FEEDBACK_BINDING WebGLTransformFeedback or null See bindTransformFeedback.
gl.TRANSFORM_FEEDBACK_BUFFER_BINDING WebGLBuffer or null See bindBuffer.
gl.TRANSFORM_FEEDBACK_PAUSED GLboolean
gl.UNIFORM_BUFFER_BINDING WebGLBuffer or null See bindBuffer.
gl.UNIFORM_BUFFER_OFFSET_ALIGNMENT GLint See pixelStorei.
gl.UNPACK_IMAGE_HEIGHT GLint See pixelStorei.
gl.UNPACK_ROW_LENGTH GLint See pixelStorei.
gl.UNPACK_SKIP_IMAGES GLint See pixelStorei.
gl.UNPACK_SKIP_PIXELS GLint See pixelStorei.
gl.UNPACK_SKIP_ROWS GLint See pixelStorei.
gl.VERTEX_ARRAY_BINDING WebGLVertexArrayObject or null See bindVertexArray.

WebGL extensions

You can query the following pname parameters when using WebGL extensions:

Constant Returned type Extension Description
ext.MAX_TEXTURE_MAX_ANISOTROPY_EXT GLfloat EXT_texture_filter_anisotropic Maximum available anisotropy.
ext.FRAGMENT_SHADER_DERIVATIVE_HINT_OES GLenum OES_standard_derivatives Accuracy of the derivative calculation for the GLSL built-in functions: dFdx, dFdy, and fwidth.
ext.MAX_COLOR_ATTACHMENTS_WEBGL GLint WEBGL_draw_buffers The maximum number of framebuffer color attachment points.
ext.MAX_DRAW_BUFFERS_WEBGL GLint WEBGL_draw_buffers The maximum number of draw buffers.
ext.DRAW_BUFFER0_WEBGL
ext.DRAW_BUFFER1_WEBGL
ext.DRAW_BUFFER2_WEBGL
ext.DRAW_BUFFER3_WEBGL
ext.DRAW_BUFFER4_WEBGL
ext.DRAW_BUFFER5_WEBGL
ext.DRAW_BUFFER6_WEBGL
ext.DRAW_BUFFER7_WEBGL
ext.DRAW_BUFFER8_WEBGL
ext.DRAW_BUFFER9_WEBGL
ext.DRAW_BUFFER10_WEBGL
ext.DRAW_BUFFER11_WEBGL
ext.DRAW_BUFFER12_WEBGL
ext.DRAW_BUFFER13_WEBGL
ext.DRAW_BUFFER14_WEBGL
ext.DRAW_BUFFER15_WEBGL
GLenum WEBGL_draw_buffers Drawing buffers.
ext.VERTEX_ARRAY_BINDING_OES WebGLVertexArrayObjectOES OES_vertex_array_object Bound vertex array object (VAO).
ext.TIMESTAMP_EXT GLuint64EXT

EXT_disjoint_timer_query

The current time.
ext.GPU_DISJOINT_EXT GLboolean EXT_disjoint_timer_query

Returns whether or not the GPU performed any disjoint operation.

ext.MAX_VIEWS_OVR GLint OVR_multiview2 Maximum number of views.

Examples

gl.getParameter(gl.DITHER);
gl.getParameter(gl.VERSION);
gl.getParameter(gl.VIEWPORT);

Specifications

Specification
WebGL Specification (WebGL)
# 5.14.3
WebGL 2.0 Specification (WebGL 2.0)
# 3.7.2

Browser compatibility

BCD tables only load in the browser

See also