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Showing content from http://developer.mozilla.org/en-US/docs/Web/API/WEBGL_draw_buffers/drawBuffersWEBGL below:

WEBGL_draw_buffers: drawBuffersWEBGL() method - Web APIs

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The WEBGL_draw_buffers.drawBuffersWEBGL() method is part of the WebGL API and allows you to define the draw buffers to which all fragment colors are written.

This method is part of the WEBGL_draw_buffers extension.

Note: When using WebGL2, this method is available as gl.drawBuffers() by default and the constants are named gl.COLOR_ATTACHMENT1 etc. without the "WEBGL" suffix.

drawBuffersWEBGL(buffers)

buffers

An Array of GLenum constants defining drawing buffers. Possible values:

• gl.NONE: The fragment shader is not written to any color buffer.
• gl.BACK: The fragment shader is written to the back color buffer.
• ext.COLOR_ATTACHMENT0_WEBGL The fragment shader is written the n-th color attachment of the framebuffer.
• ext.COLOR_ATTACHMENT1_WEBGL
• ext.COLOR_ATTACHMENT2_WEBGL
• ext.COLOR_ATTACHMENT3_WEBGL
• ext.COLOR_ATTACHMENT4_WEBGL
• ext.COLOR_ATTACHMENT5_WEBGL
• ext.COLOR_ATTACHMENT6_WEBGL
• ext.COLOR_ATTACHMENT7_WEBGL
• ext.COLOR_ATTACHMENT8_WEBGL
• ext.COLOR_ATTACHMENT9_WEBGL
• ext.COLOR_ATTACHMENT10_WEBGL
• ext.COLOR_ATTACHMENT11_WEBGL
• ext.COLOR_ATTACHMENT12_WEBGL
• ext.COLOR_ATTACHMENT13_WEBGL
• ext.COLOR_ATTACHMENT14_WEBGL
• ext.COLOR_ATTACHMENT15_WEBGL

None (undefined).

See WEBGL_draw_buffers for more context with this example code.

ext.drawBuffersWEBGL([
  ext.COLOR_ATTACHMENT0_WEBGL, // gl_FragData[0]
  ext.COLOR_ATTACHMENT1_WEBGL, // gl_FragData[1]
  ext.COLOR_ATTACHMENT2_WEBGL, // gl_FragData[2]
  ext.COLOR_ATTACHMENT3_WEBGL, // gl_FragData[3]
]);

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