WebGLRenderingContext.copyTexImage2D

The WebGLRenderingContext.copyTexImage2D() method of the WebGL API copies pixels from the current WebGLFramebuffer into a 2D texture image.

Syntax

void gl.copyTexImage2D(target, level, internalformat, x, y, width, height, border);

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.

x

A GLint specifying the x coordinate of the lower left corner where to start copying.

y

A GLint specifying the y coordinate of the lower left corner where to start copying.

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.

Return value

None.

Examples

gl.copyTexImage2D(gl.TEXTURE_2D, 0, gl.RGBA, 0, 0, 512, 512, 0);

Specifications

Specification	Status	Comment
WebGL 1.0 The definition of 'copyTexImage2D' in that specification.	Recommendation	Initial definition.
OpenGL ES 2.0 The definition of 'glCopyTexImage2D' in that specification.	Standard	Man page of the (similar) OpenGL API.

Browser compatibility

See also

• WebGLRenderingContext.createTexture()
• WebGLRenderingContext.bindTexture()
• WebGLRenderingContext.texImage2D()
• WebGLRenderingContext.texSubImage2D()
• WebGLRenderingContext.compressedTexImage2D()