From ac522d475638ec8bb53428353120f6a6a72d2ef5 Mon Sep 17 00:00:00 2001
From: Brian Paul <brian.paul@tungstengraphics.com>
Date: Wed, 13 Dec 2000 16:24:39 +0000
Subject: use inverted Y coordinate for choosing dither value (conformance
 fixes)

---
 src/mesa/drivers/x11/xm_line.c | 10 ++++++++--
 src/mesa/drivers/x11/xm_tri.c  | 44 ++++++++++++++++++++++--------------------
 2 files changed, 31 insertions(+), 23 deletions(-)

(limited to 'src/mesa/drivers/x11')

diff --git a/src/mesa/drivers/x11/xm_line.c b/src/mesa/drivers/x11/xm_line.c
index 881e219713..a759d376bb 100644
--- a/src/mesa/drivers/x11/xm_line.c
+++ b/src/mesa/drivers/x11/xm_line.c
@@ -1,4 +1,4 @@
-/* $Id: xm_line.c,v 1.12 2000/11/22 07:32:18 joukj Exp $ */
+/* $Id: xm_line.c,v 1.13 2000/12/13 16:24:40 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
@@ -54,6 +54,8 @@
 /*
  * Render an array of points into a pixmap, any pixel format.
  */
+#if 000
+/* XXX don't use this, it doesn't dither correctly */
 static void draw_points_ANY_pixmap( GLcontext *ctx, const SWvertex *vert )
 {
    XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
@@ -82,7 +84,7 @@ static void draw_points_ANY_pixmap( GLcontext *ctx, const SWvertex *vert )
       XMesaDrawPoint( dpy, buffer, gc, x, y);
    }
 }
-
+#endif
 
 
 /* Override the swrast point-selection function.  Try to use one of
@@ -91,6 +93,7 @@ static void draw_points_ANY_pixmap( GLcontext *ctx, const SWvertex *vert )
  */
 void xmesa_choose_point( GLcontext *ctx )
 {
+#if 0
    XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 
@@ -104,6 +107,9 @@ void xmesa_choose_point( GLcontext *ctx )
    else {
       _swrast_choose_point( ctx );
    }
+#else
+   _swrast_choose_point( ctx );
+#endif
 }
 
 
diff --git a/src/mesa/drivers/x11/xm_tri.c b/src/mesa/drivers/x11/xm_tri.c
index 97235c0b27..09f1f7ce1c 100644
--- a/src/mesa/drivers/x11/xm_tri.c
+++ b/src/mesa/drivers/x11/xm_tri.c
@@ -1,4 +1,4 @@
-/* $Id: xm_tri.c,v 1.13 2000/11/24 10:25:09 keithw Exp $ */
+/* $Id: xm_tri.c,v 1.14 2000/12/13 16:24:39 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
@@ -277,11 +277,12 @@ static void smooth_DITHER_5R6G5B_z_triangle( GLcontext *ctx,
 #define INNER_LOOP( LEFT, RIGHT, Y )					\
 {									\
    GLint i, len = RIGHT-LEFT;						\
+   GLint yy = FLIP(xmesa->xm_buffer, Y);				\
    (void) fffog; 					        	\
    for (i=0;i<len;i++) {						\
       GLdepth z = FixedToDepth(ffz);					\
       if (z < zRow[i]) {						\
-         PACK_TRUEDITHER(pRow[i], LEFT+i, Y, FixedToInt(ffr),		\
+         PACK_TRUEDITHER(pRow[i], LEFT+i, yy, FixedToInt(ffr),		\
 			 FixedToInt(ffg), FixedToInt(ffb) );		\
          zRow[i] = z;							\
       }									\
@@ -655,11 +656,12 @@ static void flat_DITHER_5R6G5B_z_triangle( GLcontext *ctx,
 #define INNER_LOOP( LEFT, RIGHT, Y )				\
 {								\
    GLint i, len = RIGHT-LEFT;					\
-   (void) fffog; 					        	\
+   GLint yy = FLIP(xmesa->xm_buffer, Y);			\
+   (void) fffog; 					        \
    for (i=0;i<len;i++) {					\
       DEPTH_TYPE z = FixedToDepth(ffz);				\
       if (z < zRow[i]) {					\
-	 PACK_TRUEDITHER(pRow[i], LEFT+i, Y, color[RCOMP],	\
+	 PACK_TRUEDITHER(pRow[i], LEFT+i, yy, color[RCOMP],	\
 			 color[GCOMP], color[BCOMP]);		\
          zRow[i] = z;						\
       }								\
@@ -687,19 +689,19 @@ static void flat_DITHER8_z_triangle( GLcontext *ctx,
 #define SETUP_CODE	\
    FLAT_DITHER_SETUP( v0->color[0], v0->color[1], v0->color[2] );
 
-#define INNER_LOOP( LEFT, RIGHT, Y )				\
-{								\
-   GLint i, xx = LEFT, len = RIGHT-LEFT;			\
-   FLAT_DITHER_ROW_SETUP(FLIP(xmesa->xm_buffer, Y));		\
-   (void) fffog; 					        	\
-   for (i=0;i<len;i++,xx++) {					\
-      GLdepth z = FixedToDepth(ffz);				\
-      if (z < zRow[i]) {					\
-	 pRow[i] = (PIXEL_TYPE) FLAT_DITHER(xx);		\
-         zRow[i] = z;						\
-      }								\
-      ffz += fdzdx;						\
-   }								\
+#define INNER_LOOP( LEFT, RIGHT, Y )					\
+{									\
+   GLint i, xx = LEFT, yy = FLIP(xmesa->xm_buffer,Y), len = RIGHT-LEFT;	\
+   FLAT_DITHER_ROW_SETUP(FLIP(xmesa->xm_buffer, yy));			\
+   (void) fffog;							\
+   for (i=0;i<len;i++,xx++) {						\
+      GLdepth z = FixedToDepth(ffz);					\
+      if (z < zRow[i]) {						\
+	 pRow[i] = (PIXEL_TYPE) FLAT_DITHER(xx);			\
+         zRow[i] = z;							\
+      }									\
+      ffz += fdzdx;							\
+   }									\
 }
 #include "swrast/s_tritemp.h"
 }
@@ -988,10 +990,10 @@ static void smooth_DITHER_5R6G5B_triangle( GLcontext *ctx,
 #define BYTES_PER_ROW (xmesa->xm_buffer->backimage->bytes_per_line)
 #define INNER_LOOP( LEFT, RIGHT, Y )					\
 {									\
-   GLint xx;								\
+   GLint xx, yy = FLIP(xmesa->xm_buffer, Y);				\
    PIXEL_TYPE *pixel = pRow;						\
    for (xx=LEFT;xx<RIGHT;xx++,pixel++) {				\
-      PACK_TRUEDITHER(*pixel, xx, Y, FixedToInt(ffr),			\
+      PACK_TRUEDITHER(*pixel, xx, yy, FixedToInt(ffr),			\
 				 FixedToInt(ffg), FixedToInt(ffb) );	\
       ffr += fdrdx;  ffg += fdgdx;  ffb += fdbdx;			\
    }									\
@@ -1286,10 +1288,10 @@ static void flat_DITHER_5R6G5B_triangle( GLcontext *ctx,
 #define BYTES_PER_ROW (xmesa->xm_buffer->backimage->bytes_per_line)
 #define INNER_LOOP( LEFT, RIGHT, Y )			\
 {							\
-   GLint xx;						\
+   GLint xx, yy = FLIP(xmesa->xm_buffer, Y);		\
    PIXEL_TYPE *pixel = pRow;				\
    for (xx=LEFT;xx<RIGHT;xx++,pixel++) {		\
-      PACK_TRUEDITHER(*pixel, xx, Y, color[RCOMP],	\
+      PACK_TRUEDITHER(*pixel, xx, yy, color[RCOMP],	\
                      color[GCOMP], color[BCOMP]);	\
    }							\
 }
-- 
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