diff options
Diffstat (limited to 'src/mesa/drivers/dri/i965/brw_sf.c')
| -rw-r--r-- | src/mesa/drivers/dri/i965/brw_sf.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/src/mesa/drivers/dri/i965/brw_sf.c b/src/mesa/drivers/dri/i965/brw_sf.c index 8c1711538af..c3c85978f4d 100644 --- a/src/mesa/drivers/dri/i965/brw_sf.c +++ b/src/mesa/drivers/dri/i965/brw_sf.c @@ -167,8 +167,14 @@ static void upload_sf_prog(struct brw_context *brw) key.do_twoside_color = (ctx->Light.Enabled && ctx->Light.Model.TwoSide); /* _NEW_POLYGON */ - if (key.do_twoside_color) - key.frontface_ccw = (ctx->Polygon.FrontFace == GL_CCW); + if (key.do_twoside_color) { + /* If we're rendering to a FBO, we have to invert the polygon + * face orientation, just as we invert the viewport in + * sf_unit_create_from_key(). ctx->DrawBuffer->Name will be + * nonzero if we're rendering to such an FBO. + */ + key.frontface_ccw = (ctx->Polygon.FrontFace == GL_CCW) ^ (ctx->DrawBuffer->Name != 0); + } dri_bo_unreference(brw->sf.prog_bo); brw->sf.prog_bo = brw_search_cache(&brw->cache, BRW_SF_PROG, |