Baseline Widely available
Note: This feature is available in Web Workers.
The WebGLRenderingContext.copyTexImage2D() method of the WebGL API copies pixels from the current WebGLFramebuffer into a 2D texture image.
copyTexImage2D(target, level, internalformat, x, y, width, height, border)
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.
internalformat
A GLenum 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.
None (undefined).
gl.copyTexImage2D(gl.TEXTURE_2D, 0, gl.RGBA, 0, 0, 512, 512, 0);
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