Baseline Widely available
Note: This feature is available in Web Workers.
The WebGLRenderingContext.copyTexSubImage2D() method of the WebGL API copies pixels from the current WebGLFramebuffer into an existing 2D texture sub-image.
copyTexSubImage2D(target, level, xoffset, yoffset, x, y, width, height)
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 n-th mipmap reduction level.
xoffset
A GLint specifying the horizontal offset within the texture image.
yoffset
A GLint specifying the vertical offset within the texture image.
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.
None (undefined).
gl.copyTexSubImage2D(gl.TEXTURE_2D, 0, 0, 0, 0, 0, 16, 16);
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