Mesa (mesa_7_6_branch): r200: remove subpixel offset from viewport

[Alex Deucher]

Module: Mesa
Branch: mesa_7_6_branch
Commit: 3856c3cc46813ad96ae6f02dec19460193d986ac
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=3856c3cc46813ad96ae6f02dec19460193d986ac

Author: Frederic Crozat <fcrozat at mandriva.com>
Date:   Sun Oct  4 17:46:40 2009 -0400

r200: remove subpixel offset from viewport

Fixes bug fdo 20340 for r200.

---

 src/mesa/drivers/dri/r200/r200_state.c |   15 ++++-----------
 1 files changed, 4 insertions(+), 11 deletions(-)

diff --git a/src/mesa/drivers/dri/r200/r200_state.c b/src/mesa/drivers/dri/r200/r200_state.c
index 76852e3..d28e96d 100644
--- a/src/mesa/drivers/dri/r200/r200_state.c
+++ b/src/mesa/drivers/dri/r200/r200_state.c
@@ -1578,13 +1578,6 @@ static void r200ClearStencil( GLcontext *ctx, GLint s )
  * Window position and viewport transformation
  */
 
-/*
- * To correctly position primitives:
- */
-#define SUBPIXEL_X 0.125
-#define SUBPIXEL_Y 0.125
-
-
 /**
  * Called when window size or position changes or viewport or depth range
  * state is changed.  We update the hardware viewport state here.
@@ -1609,9 +1602,9 @@ void r200UpdateWindow( GLcontext *ctx )
    }
 
    float_ui32_type sx = { v[MAT_SX] };
-   float_ui32_type tx = { v[MAT_TX] + xoffset + SUBPIXEL_X };
+   float_ui32_type tx = { v[MAT_TX] + xoffset };
    float_ui32_type sy = { v[MAT_SY] * y_scale };
-   float_ui32_type ty = { (v[MAT_TY] * y_scale) + y_bias + SUBPIXEL_Y };
+   float_ui32_type ty = { (v[MAT_TY] * y_scale) + y_bias };
    float_ui32_type sz = { v[MAT_SZ] * depthScale };
    float_ui32_type tz = { v[MAT_TZ] * depthScale };
 
@@ -1680,8 +1673,8 @@ void r200UpdateViewportOffset( GLcontext *ctx )
    float_ui32_type tx;
    float_ui32_type ty;
 
-   tx.f = v[MAT_TX] + xoffset + SUBPIXEL_X;
-   ty.f = (- v[MAT_TY]) + yoffset + SUBPIXEL_Y;
+   tx.f = v[MAT_TX] + xoffset;
+   ty.f = (- v[MAT_TY]) + yoffset;
 
    if ( rmesa->hw.vpt.cmd[VPT_SE_VPORT_XOFFSET] != tx.ui32 ||
 	rmesa->hw.vpt.cmd[VPT_SE_VPORT_YOFFSET] != ty.ui32 )