Note: This feature is available in Web Workers.
The copyTexImage2D() method of the WebGLRenderingContext interface of the WebGL API copies pixels from the current WebGLFramebuffer into a 2D texture image.
copyTexImage2D(target, level, internalformat, x, y, width, height, border)targetA 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.levelA GLint specifying the level of detail. Level 0 is the base image level and level n is the n-th mipmap reduction level.
internalformatA GLenum specifying how the texture should be stored after it's loaded. 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.xA GLint specifying the x coordinate of the lower left corner where to start copying.
yA GLint specifying the y coordinate of the lower left corner where to start copying.
widthA GLsizei specifying the width of the texture in texels.
heightA GLsizei specifying the height of the texture in texels.
borderA GLint specifying the width of the border. Must be 0.
None (undefined).
gl.copyTexImage2D(gl.TEXTURE_2D, 0, gl.RGBA, 0, 0, 512, 512, 0);