There exists an extension for OpenGL ES 2.0 from NVIDIA, called GL_NV_framebuffer_blit
.
Examples of devices that support it can be found in the list here:
https://opengles.gpuinfo.org/listreports.php?extension=GL_NV_framebuffer_blit.
Some other GLES 2.0 devices also seem to report GL_ANGLE_framebuffer_blit
, though:
https://opengles.gpuinfo.org/listreports.php?extension=GL_ANGLE_framebuffer_blit
https://opengles.gpuinfo.org/listreports.php?extension=ANGLE_framebuffer_blit