gallium: Replace gl_rasterization_rules with lower_left_origin and half_pixel_center.

Squashed commit of the following:

commit 04c5fa2cbb8e89d6f2fa5a75af1cca03b1f6b852
Author: José Fonseca <[email protected]>
Date:   Tue Apr 23 17:37:18 2013 +0100

    gallium: s/lower_left_origin/bottom_edge_rule/

commit 4dff4f64fa83b9737def136fffd161d55e4f1722
Author: José Fonseca <[email protected]>
Date:   Tue Apr 23 17:35:04 2013 +0100

    gallium: Move diagram to docs.

commit 442a63012c8c3c3797f45e03f2ca20ad5f399832
Author: James Benton <[email protected]>
Date:   Fri May 11 17:50:55 2012 +0100

    gallium: Replace gl_rasterization_rules with lower_left_origin and half_pixel_center.

    This change is necessary to achieve correct results when using OpenGL
    FBOs.

Reviewed-by: Marek Olšák <[email protected]>

1 files changed, 2 insertions, 12 deletions

diff --git a/src/gallium/include/pipe/p_state.h b/src/gallium/include/pipe/p_state.h
index 5da3a533e85..c0b2bcd0cef 100644
--- a/src/gallium/include/pipe/p_state.h
+++ b/src/gallium/include/pipe/p_state.h
@@ -107,18 +107,8 @@ struct pipe_rasterizer_state
     */
    unsigned flatshade_first:1;
 
-   /**
-    * When true, triangle rasterization uses (0.5, 0.5) pixel centers
-    * for determining pixel ownership.
-    *
-    * When false, triangle rasterization uses (0,0) pixel centers for
-    * determining pixel ownership.
-    *
-    * Triangle rasterization always uses a 'top,left' rule for pixel
-    * ownership, this just alters which point we consider the pixel
-    * center for that test.
-    */
-   unsigned gl_rasterization_rules:1;
+   unsigned half_pixel_center:1;
+   unsigned bottom_edge_rule:1;
 
    /**
     * When true, rasterization is disabled and no pixels are written.