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Neil Roberts
392cfb493a
cogl-gles: Check for the GL_ANGLE_framebuffer_blit extension
This extension is the GLES equivalent of the GL_EXT_framebuffer_blit extension except that it has some extra restrictions. We need to check for some extension that provides glBlitFramebuffer so that we can unconditionally use ctx->drv.pf_glBlitFramebuffer in both GL and GLES code. Even with the restrictions, the extension provides enough features for what Cogl needs.
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