i965: Fix gl_FragCoord inversion when drawing to an FBO.

This showed up as cairo-gl gradients being inverted on everyone but
Intel, where I'd apparently tweaked the transformation to work around
the bug.  Fixes piglit fbo-fragcoord.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/mesa/drivers/dri/i965/brw_wm.c b/src/mesa/drivers/dri/i965/brw_wm.c
index a6d2a2377f6..ccdc18e0b8d 100644
--- a/src/mesa/drivers/dri/i965/brw_wm.c
+++ b/src/mesa/drivers/dri/i965/brw_wm.c
@@ -423,6 +423,7 @@ static void brw_wm_populate_key( struct brw_context *brw,
     */
    if (fp->program.Base.InputsRead & FRAG_BIT_WPOS) {
       key->drawable_height = ctx->DrawBuffer->Height;
+      key->render_to_fbo = ctx->DrawBuffer->Name != 0;
    }
 
    key->nr_color_regions = brw->state.nr_color_regions;