WebGLRenderingContext.texImage2D()

The WebGLRenderingContext.texImage2D() method of the WebGL API specifies a two-dimensional texture image.

Syntax

void <var>gl</var>.texImage2D(<var>target</var>, <var>level</var>, <var>internalformat</var>, <var>width</var>, <var>height</var>, <var>border</var>, <var>format</var>, <var>type</var>, ArrayBufferView? <var>pixels</var>);
void <var>gl</var>.texImage2D(<var>target</var>, <var>level</var>, <var>internalformat</var>, <var>format</var>, <var>type</var>, ImageData? <var>pixels</var>);
void <var>gl</var>.texImage2D(<var>target</var>, <var>level</var>, <var>internalformat</var>, <var>format</var>, <var>type</var>, HTMLImageElement? <var>pixels</var>);
void <var>gl</var>.texImage2D(<var>target</var>, <var>level</var>, <var>internalformat</var>, <var>format</var>, <var>type</var>, HTMLCanvasElement? <var>pixels</var>);
void <var>gl</var>.texImage2D(<var>target</var>, <var>level</var>, <var>internalformat</var>, <var>format</var>, <var>type</var>, HTMLVideoElement? <var>pixels</var>);

Additional signature in a WebGL 2 context:
void gl.texImage2D(<var>target</var>, <var>level</var>, <var>internalformat</var>, width, <var>height</var>, <var>border</var>, <var>format</var>, <var>type</var>, GLintptr <var>offset</var>);

Parameters

target

A GLenum specifying the binding point (target) of the active texture. Possible values:

• gl.TEXTURE_2D: A two-dimensional texture.
• gl.TEXTURE_CUBE_MAP_POSITIVE_X: Positive X face for a cube-mapped texture.
• gl.TEXTURE_CUBE_MAP_NEGATIVE_X: Negative X face for a cube-mapped texture.
• gl.TEXTURE_CUBE_MAP_POSITIVE_Y: Positive Y face for a cube-mapped texture.
• gl.TEXTURE_CUBE_MAP_NEGATIVE_Y: Negative Y face for a cube-mapped texture.
• gl.TEXTURE_CUBE_MAP_POSITIVE_Z: Positive Z face for a cube-mapped texture.
• gl.TEXTURE_CUBE_MAP_NEGATIVE_Z: Negative Z face for a cube-mapped texture.

level

A GLint specifying the level of detail. Level 0 is the base image level and level n is the nth mipmap reduction level.

internalformat

A GLint specifying the color components in the texture. Possible values:

• gl.ALPHA: Discards the red, green and blue components and reads the alpha component.
• gl.RGB: Discards the alpha components and reads the red, green and blue components.
• gl.RGBA: Red, green, blue and alpha components are read from the color buffer.
• gl.LUMINANCE: Each color component is a luminance component, alpha is 1.0.
• gl.LUMINANCE_ALPHA: Each component is a luminance/alpha component.
• When using the WEBGL_depth_texture extension:
  • gl.DEPTH_COMPONENT
  • gl.DEPTH_STENCIL
• When using the EXT_sRGB extension:
  • ext.SRGB_EXT
  • ext.SRGB_ALPHA_EXT
• When using a WebGL 2 context, the following values are available additionally:
  • gl.R8
  • gl.R16F
  • gl.R32F
  • gl.R8UI
  • gl.RG8
  • gl.RG16F
  • gl.RG32F
  • gl.RGUI
  • gl.RGB8
  • gl.SRGB8
  • gl.RGB565
  • gl.R11F_G11F_B10F
  • gl.RGB9_E5
  • gl.RGB16F
  • gl.RGB32F
  • gl.RGB8UI
  • gl.RGBA8
  • gl.SRGB_APLHA8
  • gl.RGB5_A1
  • gl.RGBA4444
  • gl.RGBA16F
  • gl.RGBA32F
  • gl.RGBA8UI

width

A GLsizei specifying the width of the texture.

height

A GLsizei specifying the height of the texture.

border

A GLint specifying the width of the border. Must be 0.

format

A GLenum specifying the format of the texel data. In WebGL 1, this must be the same as internalformat (see above). in WebGL 2, the combinations are listed in this table.

type

A GLenum specifying the data type of the texel data. Possible values:

• gl.UNSIGNED_BYTE: 8 bits per channel for gl.RGBA
• gl.UNSIGNED_SHORT_5_6_5: 5 red bits, 6 green bits, 5 blue bits.
• gl.UNSIGNED_SHORT_4_4_4_4: 4 red bits, 4 green bits, 4 blue bits, 4 alpha bits.
• gl.UNSIGNED_SHORT_5_5_5_1: 5 red bits, 5 green bits, 5 blue bits, 1 alpha bit.
• When using the WEBGL_depth_texture extension:
  • gl.UNSIGNED_SHORT
  • gl.UNSIGNED_INT
  • ext.UNSIGNED_INT_24_8_WEBGL (constant provided by the extension)
• When using the OES_texture_float extension:
  • gl.FLOAT
• When using the OES_texture_half_float extension:
  • ext.HALF_FLOAT_OES (constant provided by the extension)
• When using a WebGL 2 context, the following values are available additionally:
  • gl.BYTE
  • gl.UNSIGNED_SHORT
  • gl.SHORT
  • gl.UNSIGNED_INT
  • gl.INT
  • gl.HALF_FLOAT
  • gl.FLOAT
  • gl.UNSIGNED_INT_2_10_10_10_REV
  • gl.UNSIGNED_INT_10F_11F_11F_REV
  • gl.UNSIGNED_INT_5_9_9_9_REV
  • gl.UNSIGNED_INT_24_8
  • gl.FLOAT_32_UNSIGNED_INT_24_8_REV (pixels must be null)

pixels

One of the following objects can be used as a pixel source for the texture:

• ArrayBufferView,
  • A Uint8Array must be used if type is gl.UNSIGNED_BYTE.
  • A Uint16Array must be used if type is either gl.UNSIGNED_SHORT_5_6_5, gl.UNSIGNED_SHORT_4_4_4_4, gl.UNSIGNED_SHORT_5_5_5_1, gl.UNSIGNED_SHORT or ext.HALF_FLOAT_OES.
  • A Uint32Array must be used if type is gl.UNSIGNED_INT or ext.UNSIGNED_INT_24_8_WEBGL.
  • A Float32Array must be used if type is gl.FLOAT.
• ImageData,
• HTMLImageElement,
• HTMLCanvasElement,
• HTMLVideoElement.

offset

(WebGL 2 only) A GLintptr byte offset into the WebGLBuffer's data store. Used to upload data to the currently bound WebGLTexture from the WebGLBuffer bound to the PIXEL_UNPACK_BUFFER target.

Return value

None.

Examples

gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, image);

Specifications

Browser compatibility

[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.

See also

• WebGLRenderingContext.createTexture()
• WebGLRenderingContext.bindTexture()
• WebGLRenderingContext.texSubImage2D()
• WebGLRenderingContext.compressedTexImage2D()
• WebGLRenderingContext.copyTexImage2D()
• WebGLRenderingContext.getTexParameter()
• WEBGL_depth_texture
• OES_texture_float
• OES_texture_half_float
• EXT_sRGB