glReadBuffer — select a color buffer source for pixels
void glReadBuffer( | GLenum mode); |
mode Specifies a color buffer. Accepted values are GL_BACK, GL_NONE, and GL_COLOR_ATTACHMENTi.
glReadBuffer specifies a color buffer as the source for subsequent glReadPixels, , glCopyTexImage2D, glCopyTexSubImage2D, and glCopyTexSubImage3D commands. mode accepts one of the following values: GL_NONE, GL_BACK names the back buffer of the default framebuffer, and GL_COLOR_ATTACHMENTi names a color attachment of the current framebuffer,
GL_INVALID_ENUM is generated if mode is not GL_BACK, GL_NONE, or GL_COLOR_ATTACHMENTi, where i is less than GL_MAX_COLOR_ATTACHMENTS.
GL_INVALID_OPERATION is generated if the current framebuffer is the default framebufer and mode is not GL_NONE or GL_BACK.
GL_INVALID_OPERATION is generated if the current framebuffer is a named framebufer and mode is not GL_NONE or GL_COLOR_ATTACHMENTi.
glGet with argument GL_READ_BUFFER
| OpenGL ES API Version | |||
|---|---|---|---|
| Function Name | 2.0 | 3.0 | 3.1 |
| glReadBuffer | - | ✔ | ✔ |
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