From: Brian <brian.paul@tungstengraphics.com>
Date: Fri, 16 Nov 2007 17:39:08 +0000 (-0700)
Subject: note problem with fragment coord Y orientation
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=95f066fc54ed351a93350b99b584987b88524e71;p=mesa.git

note problem with fragment coord Y orientation
---

diff --git a/src/mesa/pipe/softpipe/sp_quad_fs.c b/src/mesa/pipe/softpipe/sp_quad_fs.c
index 17fb10ea72b..ed14dac18e4 100644
--- a/src/mesa/pipe/softpipe/sp_quad_fs.c
+++ b/src/mesa/pipe/softpipe/sp_quad_fs.c
@@ -104,6 +104,10 @@ shade_quad(
    machine->Inputs[0].xyzw[0].f[2] = fx;
    machine->Inputs[0].xyzw[0].f[3] = fx + 1.0f;
 
+   /* XXX for OpenGL we need to invert the Y pos here (y=0=top).
+    * but that'll mess up linear/perspective interpolation of other
+    * attributes...
+    */
    machine->Inputs[0].xyzw[1].f[0] = fy;
    machine->Inputs[0].xyzw[1].f[1] = fy;
    machine->Inputs[0].xyzw[1].f[2] = fy + 1.0f;