<html> <head> <meta http-equiv="content-type" content="text/html; charset=ISO-8859-1"> </head> <body text="#000000" bgcolor="#FFFFFF"> <meta http-equiv="content-type" content="text/html; charset=ISO-8859-1"> <pre style="white-space: pre-wrap; color: rgb(0, 0, 0); font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;">On Fri, Mar 07, 2014, <meta http-equiv="content-type" content="text/html; charset=ISO-8859-1">Topi Pohjolainen wrote: > On Mon, Mar 03, 2014 at 01:19:48PM +1000, Dave Airlie wrote: > > There is a comment and two checks in the i965 dma-buf importer, > > > > * Images originating via EGL_EXT_image_dma_buf_import can be used only > > * with GL_OES_EGL_image_external only. > > > > however I can't find any reference to this in the spec txt, and > > removing the checks make my test app run fine using TEXTURE_2D. > > You are correct that there is nothing in the spec about this, but it also leaves > it open for the driver to choose on which buffers it allows the external > sampling. > After quite a bit of debate on when/where it would be safe to use dma-buffers, > it was decided that we simply allow dma-buffers for external sampling only - > that extension already restricts the use for single-miplevel and read-only > which is exactly what we wanted. > The same time it wasn't clear what kind of sources we should allow for external > sampling (besides dma), and hence we simply kept things as they were before - > none other. Note that before the introduction of dma-buffers the image external > extension wasn't enabled at all on i965. > I must say this has been a problem when implementing dri3 support in glamor. We need to import fds (from argb8888 buffers) and convert to a pixmap (which we might write to later.). This extension is the only way to import fds a device independant way (gbm doesn't have that yet). The trick I had to use when writing the code is to convert to gbm_bo the EGLImage, then convert back the gbm_bo to EGLImage. The new EGLImage has no restrictions. Axel Davy </pre> </body> </html>