WebGLRenderingContext.texImage2D() - Web APIs 编辑

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

Syntax

// WebGL1:
void gl.texImage2D(target, level, internalformat, width, height, border, format, type, ArrayBufferView? pixels);
void gl.texImage2D(target, level, internalformat, format, type, ImageData? pixels);
void gl.texImage2D(target, level, internalformat, format, type, HTMLImageElement? pixels);
void gl.texImage2D(target, level, internalformat, format, type, HTMLCanvasElement? pixels);
void gl.texImage2D(target, level, internalformat, format, type, HTMLVideoElement? pixels);
void gl.texImage2D(target, level, internalformat, format, type, ImageBitmap? pixels);

// WebGL2:
void gl.texImage2D(target, level, internalformat, width, height, border, format, type, GLintptr offset);
void gl.texImage2D(target, level, internalformat, width, height, border, format, type, HTMLCanvasElement source);
void gl.texImage2D(target, level, internalformat, width, height, border, format, type, HTMLImageElement source);
void gl.texImage2D(target, level, internalformat, width, height, border, format, type, HTMLVideoElement source);
void gl.texImage2D(target, level, internalformat, width, height, border, format, type, ImageBitmap source);
void gl.texImage2D(target, level, internalformat, width, height, border, format, type, ImageData source);
void gl.texImage2D(target, level, internalformat, width, height, border, format, type, ArrayBufferView srcData, srcOffset);

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 GLenum specifying the color components in the texture.

Possible values in both WebGL1 and WebGL2

Format	Type	Channels	Bytes per pixel
RGBA	UNSIGNED_BYTE	4	4
RGB	UNSIGNED_BYTE	3	3
RGBA	UNSIGNED_SHORT_4_4_4_4	4	2
RGBA	UNSIGNED_SHORT_5_5_5_1	4	2
RGB	UNSIGNED_SHORT_5_6_5	3	2
LUMINANCE_ALPHA	UNSIGNED_BYTE	2	2
LUMINANCE	UNSIGNED_BYTE	1	1
ALPHA	UNSIGNED_BYTE	1	1

Other possible values in WebGL2 for the versions of texImage2D that take an ArrayBufferView or a GLintptr offset

Possible values in WebGL2 for the versions of texImage2D that take a texture an HTMLImageElement, HTMLCanvasElement, HTMLVideoElement, ImageBitmap, or ImageData

• 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.RG8UI
  • gl.RG16UI
  • gl.RG32UI
  • gl.RGB8
  • gl.SRGB8
  • gl.RGB565
  • gl.R11F_G11F_B10F
  • gl.RGB9_E5
  • gl.RGB16F
  • gl.RGB32F
  • gl.RGB8UI
  • gl.RGBA8
  • gl.SRGB8_ALPHA8
  • gl.RGB5_A1
  • gl.RGB10_A2
  • gl.RGBA4
  • 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,
• ImageBitmap.

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

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The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.

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_texture_norm16
• EXT_sRGB