Adjust mga drivers to remove redundant h file for sarea and IOCTLs

[mesa.git] / src / mesa / drivers / x11 / xm_span.c

diff --git a/src/mesa/drivers/x11/xm_span.c b/src/mesa/drivers/x11/xm_span.c
index eed8c91a968fe3cff9bc7952b4d3457ff404886d..71a4c8008257f51c4dca7385557b2cc73aabdf8c 100644 (file)
--- a/src/mesa/drivers/x11/xm_span.c
+++ b/src/mesa/drivers/x11/xm_span.c
@@ -1,10 +1,8 @@
-/* $Id: xm_span.c,v 1.15 2002/07/09 01:22:52 brianp Exp $ */
-
 /*
  * Mesa 3-D graphics library
- * Version:  3.5
+ * Version:  5.1
  *
- * Copyright (C) 1999-2001  Brian Paul   All Rights Reserved.
+ * Copyright (C) 1999-2003  Brian Paul   All Rights Reserved.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
  * copy of this software and associated documentation files (the "Software"),
@@ -26,15 +24,16 @@
 /* $XFree86: xc/extras/Mesa/src/X/xm_span.c,v 1.3 2002/02/27 21:07:54 tsi Exp $ */
 
 #include "glxheader.h"
+#include "colormac.h"
 #include "context.h"
-#include "drawpix.h"
-#include "mem.h"
-#include "state.h"
 #include "depth.h"
+#include "drawpix.h"
+#include "extensions.h"
 #include "macros.h"
+#include "imports.h"
 #include "mtypes.h"
+#include "state.h"
 #include "xmesaP.h"
-#include "extensions.h"
 
 #include "swrast/swrast.h"
 
@@ -181,14 +180,12 @@ static unsigned long read_pixel( XMesaDisplay *dpy,
  */
 static void write_span_TRUECOLOR_pixmap( RGBA_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaDisplay *dpy = xmesa->xm_visual->display;
    XMesaDrawable buffer = xmesa->xm_buffer->buffer;
    XMesaGC gc = xmesa->xm_buffer->gc;
    register GLuint i;
 
-   (void)DitherValues;         /* Muffle compiler */
-
    y = FLIP(xmesa->xm_buffer, y);
    if (mask) {
       for (i=0;i<n;i++,x++) {
@@ -218,7 +215,7 @@ static void write_span_TRUECOLOR_pixmap( RGBA_SPAN_ARGS )
  */
 static void write_span_rgb_TRUECOLOR_pixmap( RGB_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaDisplay *dpy = xmesa->xm_visual->display;
    XMesaDrawable buffer = xmesa->xm_buffer->buffer;
    XMesaGC gc = xmesa->xm_buffer->gc;
@@ -252,7 +249,7 @@ static void write_span_rgb_TRUECOLOR_pixmap( RGB_SPAN_ARGS )
  */
 static void write_span_TRUEDITHER_pixmap( RGBA_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaDisplay *dpy = xmesa->xm_visual->display;
    XMesaDrawable buffer = xmesa->xm_buffer->buffer;
    XMesaGC gc = xmesa->xm_buffer->gc;
@@ -285,7 +282,7 @@ static void write_span_TRUEDITHER_pixmap( RGBA_SPAN_ARGS )
  */
 static void write_span_rgb_TRUEDITHER_pixmap( RGB_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaDisplay *dpy = xmesa->xm_visual->display;
    XMesaDrawable buffer = xmesa->xm_buffer->buffer;
    XMesaGC gc = xmesa->xm_buffer->gc;
@@ -319,7 +316,7 @@ static void write_span_rgb_TRUEDITHER_pixmap( RGB_SPAN_ARGS )
  */
 static void write_span_8A8B8G8R_pixmap( RGBA_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaDisplay *dpy = xmesa->xm_visual->display;
    XMesaDrawable buffer = xmesa->xm_buffer->buffer;
    XMesaGC gc = xmesa->xm_buffer->gc;
@@ -351,7 +348,7 @@ static void write_span_8A8B8G8R_pixmap( RGBA_SPAN_ARGS )
  */
 static void write_span_rgb_8A8B8G8R_pixmap( RGB_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaDisplay *dpy = xmesa->xm_visual->display;
    XMesaDrawable buffer = xmesa->xm_buffer->buffer;
    XMesaGC gc = xmesa->xm_buffer->gc;
@@ -383,7 +380,7 @@ static void write_span_rgb_8A8B8G8R_pixmap( RGB_SPAN_ARGS )
  */
 static void write_span_8R8G8B_pixmap( RGBA_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaDisplay *dpy = xmesa->xm_visual->display;
    XMesaDrawable buffer = xmesa->xm_buffer->buffer;
    XMesaGC gc = xmesa->xm_buffer->gc;
@@ -414,7 +411,7 @@ static void write_span_8R8G8B_pixmap( RGBA_SPAN_ARGS )
  */
 static void write_span_8R8G8B24_pixmap( RGBA_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaDisplay *dpy = xmesa->xm_visual->display;
    XMesaDrawable buffer = xmesa->xm_buffer->buffer;
    XMesaGC gc = xmesa->xm_buffer->gc;
@@ -508,7 +505,7 @@ static void write_span_8R8G8B24_pixmap( RGBA_SPAN_ARGS )
  */
 static void write_span_rgb_8R8G8B_pixmap( RGB_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaDisplay *dpy = xmesa->xm_visual->display;
    XMesaDrawable buffer = xmesa->xm_buffer->buffer;
    XMesaGC gc = xmesa->xm_buffer->gc;
@@ -539,7 +536,7 @@ static void write_span_rgb_8R8G8B_pixmap( RGB_SPAN_ARGS )
  */
 static void write_span_rgb_8R8G8B24_pixmap( RGB_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaDisplay *dpy = xmesa->xm_visual->display;
    XMesaDrawable buffer = xmesa->xm_buffer->buffer;
    XMesaGC gc = xmesa->xm_buffer->gc;
@@ -638,7 +635,7 @@ static void write_span_rgb_8R8G8B24_pixmap( RGB_SPAN_ARGS )
  */
 static void write_span_5R6G5B_pixmap( RGBA_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaDisplay *dpy = xmesa->xm_visual->display;
    XMesaDrawable buffer = xmesa->xm_buffer->buffer;
    XMesaGC gc = xmesa->xm_buffer->gc;
@@ -669,7 +666,7 @@ static void write_span_5R6G5B_pixmap( RGBA_SPAN_ARGS )
  */
 static void write_span_DITHER_5R6G5B_pixmap( RGBA_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaDisplay *dpy = xmesa->xm_visual->display;
    XMesaDrawable buffer = xmesa->xm_buffer->buffer;
    XMesaGC gc = xmesa->xm_buffer->gc;
@@ -702,7 +699,7 @@ static void write_span_DITHER_5R6G5B_pixmap( RGBA_SPAN_ARGS )
  */
 static void write_span_rgb_5R6G5B_pixmap( RGB_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaDisplay *dpy = xmesa->xm_visual->display;
    XMesaDrawable buffer = xmesa->xm_buffer->buffer;
    XMesaGC gc = xmesa->xm_buffer->gc;
@@ -733,7 +730,7 @@ static void write_span_rgb_5R6G5B_pixmap( RGB_SPAN_ARGS )
  */
 static void write_span_rgb_DITHER_5R6G5B_pixmap( RGB_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaDisplay *dpy = xmesa->xm_visual->display;
    XMesaDrawable buffer = xmesa->xm_buffer->buffer;
    XMesaGC gc = xmesa->xm_buffer->gc;
@@ -767,7 +764,7 @@ static void write_span_rgb_DITHER_5R6G5B_pixmap( RGB_SPAN_ARGS )
  */
 static void write_span_DITHER_pixmap( RGBA_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaDisplay *dpy = xmesa->xm_visual->display;
    XMesaDrawable buffer = xmesa->xm_buffer->buffer;
    XMesaGC gc = xmesa->xm_buffer->gc;
@@ -798,7 +795,7 @@ static void write_span_DITHER_pixmap( RGBA_SPAN_ARGS )
  */
 static void write_span_rgb_DITHER_pixmap( RGB_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaDisplay *dpy = xmesa->xm_visual->display;
    XMesaDrawable buffer = xmesa->xm_buffer->buffer;
    XMesaGC gc = xmesa->xm_buffer->gc;
@@ -829,7 +826,7 @@ static void write_span_rgb_DITHER_pixmap( RGB_SPAN_ARGS )
  */
 static void write_span_1BIT_pixmap( RGBA_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaDisplay *dpy = xmesa->xm_visual->display;
    XMesaDrawable buffer = xmesa->xm_buffer->buffer;
    XMesaGC gc = xmesa->xm_buffer->gc;
@@ -862,7 +859,7 @@ static void write_span_1BIT_pixmap( RGBA_SPAN_ARGS )
  */
 static void write_span_rgb_1BIT_pixmap( RGB_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaDisplay *dpy = xmesa->xm_visual->display;
    XMesaDrawable buffer = xmesa->xm_buffer->buffer;
    XMesaGC gc = xmesa->xm_buffer->gc;
@@ -895,7 +892,7 @@ static void write_span_rgb_1BIT_pixmap( RGB_SPAN_ARGS )
  */
 static void write_span_HPCR_pixmap( RGBA_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaDisplay *dpy = xmesa->xm_visual->display;
    XMesaDrawable buffer = xmesa->xm_buffer->buffer;
    XMesaGC gc = xmesa->xm_buffer->gc;
@@ -926,7 +923,7 @@ static void write_span_HPCR_pixmap( RGBA_SPAN_ARGS )
  */
 static void write_span_rgb_HPCR_pixmap( RGB_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaDisplay *dpy = xmesa->xm_visual->display;
    XMesaDrawable buffer = xmesa->xm_buffer->buffer;
    XMesaGC gc = xmesa->xm_buffer->gc;
@@ -957,7 +954,7 @@ static void write_span_rgb_HPCR_pixmap( RGB_SPAN_ARGS )
  */
 static void write_span_LOOKUP_pixmap( RGBA_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaDisplay *dpy = xmesa->xm_visual->display;
    XMesaDrawable buffer = xmesa->xm_buffer->buffer;
    XMesaGC gc = xmesa->xm_buffer->gc;
@@ -987,7 +984,7 @@ static void write_span_LOOKUP_pixmap( RGBA_SPAN_ARGS )
  */
 static void write_span_rgb_LOOKUP_pixmap( RGB_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaDisplay *dpy = xmesa->xm_visual->display;
    XMesaDrawable buffer = xmesa->xm_buffer->buffer;
    XMesaGC gc = xmesa->xm_buffer->gc;
@@ -1018,7 +1015,7 @@ static void write_span_rgb_LOOKUP_pixmap( RGB_SPAN_ARGS )
  */
 static void write_span_GRAYSCALE_pixmap( RGBA_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaDisplay *dpy = xmesa->xm_visual->display;
    XMesaDrawable buffer = xmesa->xm_buffer->buffer;
    XMesaGC gc = xmesa->xm_buffer->gc;
@@ -1047,7 +1044,7 @@ static void write_span_GRAYSCALE_pixmap( RGBA_SPAN_ARGS )
  */
 static void write_span_rgb_GRAYSCALE_pixmap( RGB_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaDisplay *dpy = xmesa->xm_visual->display;
    XMesaDrawable buffer = xmesa->xm_buffer->buffer;
    XMesaGC gc = xmesa->xm_buffer->gc;
@@ -1076,7 +1073,7 @@ static void write_span_rgb_GRAYSCALE_pixmap( RGB_SPAN_ARGS )
  */
 static void write_span_TRUECOLOR_ximage( RGBA_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaImage *img = xmesa->xm_buffer->backimage;
    register GLuint i;
    y = FLIP(xmesa->xm_buffer, y);
@@ -1105,7 +1102,7 @@ static void write_span_TRUECOLOR_ximage( RGBA_SPAN_ARGS )
  */
 static void write_span_rgb_TRUECOLOR_ximage( RGB_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaImage *img = xmesa->xm_buffer->backimage;
    register GLuint i;
    y = FLIP(xmesa->xm_buffer, y);
@@ -1134,7 +1131,7 @@ static void write_span_rgb_TRUECOLOR_ximage( RGB_SPAN_ARGS )
  */
 static void write_span_TRUEDITHER_ximage( RGBA_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaImage *img = xmesa->xm_buffer->backimage;
    register GLuint i;
    y = FLIP(xmesa->xm_buffer, y);
@@ -1163,7 +1160,7 @@ static void write_span_TRUEDITHER_ximage( RGBA_SPAN_ARGS )
  */
 static void write_span_rgb_TRUEDITHER_ximage( RGB_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaImage *img = xmesa->xm_buffer->backimage;
    register GLuint i;
    y = FLIP(xmesa->xm_buffer, y);
@@ -1192,7 +1189,7 @@ static void write_span_rgb_TRUEDITHER_ximage( RGB_SPAN_ARGS )
  */
 static void write_span_8A8B8G8R_ximage( RGBA_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    register GLuint i;
    register GLuint *ptr = PIXELADDR4( xmesa->xm_buffer, x, y );
    if (mask) {
@@ -1216,7 +1213,7 @@ static void write_span_8A8B8G8R_ximage( RGBA_SPAN_ARGS )
  */
 static void write_span_rgb_8A8B8G8R_ximage( RGB_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    register GLuint i;
    register GLuint *ptr = PIXELADDR4( xmesa->xm_buffer, x, y );
    if (mask) {
@@ -1240,7 +1237,7 @@ static void write_span_rgb_8A8B8G8R_ximage( RGB_SPAN_ARGS )
  */
 static void write_span_8R8G8B_ximage( RGBA_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    register GLuint i;
    register GLuint *ptr = PIXELADDR4( xmesa->xm_buffer, x, y );
    if (mask) {
@@ -1263,7 +1260,7 @@ static void write_span_8R8G8B_ximage( RGBA_SPAN_ARGS )
  */
 static void write_span_8R8G8B24_ximage( RGBA_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    register GLuint i;
    register GLubyte *ptr = (GLubyte *) PIXELADDR3( xmesa->xm_buffer, x, y );
    if (mask) {
@@ -1413,7 +1410,7 @@ static void write_span_8R8G8B24_ximage( RGBA_SPAN_ARGS )
  */
 static void write_span_rgb_8R8G8B_ximage( RGB_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    register GLuint i;
    register GLuint *ptr = PIXELADDR4( xmesa->xm_buffer, x, y );
    if (mask) {
@@ -1437,7 +1434,7 @@ static void write_span_rgb_8R8G8B_ximage( RGB_SPAN_ARGS )
  */
 static void write_span_rgb_8R8G8B24_ximage( RGB_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    register GLuint i;
    register GLubyte *ptr = (GLubyte *) PIXELADDR3( xmesa->xm_buffer, x, y );
    if (mask) {
@@ -1468,7 +1465,7 @@ static void write_span_rgb_8R8G8B24_ximage( RGB_SPAN_ARGS )
  */
 static void write_span_5R6G5B_ximage( RGBA_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    register GLuint i;
    register GLushort *ptr = PIXELADDR2( xmesa->xm_buffer, x, y );
    if (mask) {
@@ -1507,7 +1504,7 @@ static void write_span_5R6G5B_ximage( RGBA_SPAN_ARGS )
  */
 static void write_span_DITHER_5R6G5B_ximage( RGBA_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    register GLuint i;
    register GLushort *ptr = PIXELADDR2( xmesa->xm_buffer, x, y );
    const GLint y2 = FLIP(xmesa->xm_buffer, y);
@@ -1547,7 +1544,7 @@ static void write_span_DITHER_5R6G5B_ximage( RGBA_SPAN_ARGS )
  */
 static void write_span_rgb_5R6G5B_ximage( RGB_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    register GLuint i;
    register GLushort *ptr = PIXELADDR2( xmesa->xm_buffer, x, y );
    if (mask) {
@@ -1586,7 +1583,7 @@ static void write_span_rgb_5R6G5B_ximage( RGB_SPAN_ARGS )
  */
 static void write_span_rgb_DITHER_5R6G5B_ximage( RGB_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    register GLuint i;
    register GLushort *ptr = PIXELADDR2( xmesa->xm_buffer, x, y );
    if (mask) {
@@ -1625,7 +1622,7 @@ static void write_span_rgb_DITHER_5R6G5B_ximage( RGB_SPAN_ARGS )
  */
 static void write_span_DITHER_ximage( RGBA_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaImage *img = xmesa->xm_buffer->backimage;
    register GLuint i;
    int yy = FLIP(xmesa->xm_buffer, y);
@@ -1651,7 +1648,7 @@ static void write_span_DITHER_ximage( RGBA_SPAN_ARGS )
  */
 static void write_span_rgb_DITHER_ximage( RGB_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaImage *img = xmesa->xm_buffer->backimage;
    register GLuint i;
    int yy = FLIP(xmesa->xm_buffer, y);
@@ -1678,7 +1675,7 @@ static void write_span_rgb_DITHER_ximage( RGB_SPAN_ARGS )
  */
 static void write_span_DITHER8_ximage( RGBA_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    register GLuint i;
    register GLubyte *ptr = PIXELADDR1( xmesa->xm_buffer, x, y );
    XDITHER_SETUP(y);
@@ -1699,7 +1696,7 @@ static void write_span_DITHER8_ximage( RGBA_SPAN_ARGS )
 
 static void write_span_rgb_DITHER8_ximage( RGB_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    register GLuint i;
    register GLubyte *ptr = PIXELADDR1( xmesa->xm_buffer, x, y );
    XDITHER_SETUP(y);
@@ -1726,7 +1723,7 @@ static void write_span_rgb_DITHER8_ximage( RGB_SPAN_ARGS )
  */
 static void write_span_1BIT_ximage( RGBA_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaImage *img = xmesa->xm_buffer->backimage;
    register GLuint i;
    SETUP_1BIT;
@@ -1751,7 +1748,7 @@ static void write_span_1BIT_ximage( RGBA_SPAN_ARGS )
  */
 static void write_span_rgb_1BIT_ximage( RGB_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaImage *img = xmesa->xm_buffer->backimage;
    register GLuint i;
    SETUP_1BIT;
@@ -1776,7 +1773,7 @@ static void write_span_rgb_1BIT_ximage( RGB_SPAN_ARGS )
  */
 static void write_span_HPCR_ximage( RGBA_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    register GLuint i;
    register GLubyte *ptr = PIXELADDR1( xmesa->xm_buffer, x, y );
    if (mask) {
@@ -1800,7 +1797,7 @@ static void write_span_HPCR_ximage( RGBA_SPAN_ARGS )
  */
 static void write_span_rgb_HPCR_ximage( RGB_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    register GLuint i;
    register GLubyte *ptr = PIXELADDR1( xmesa->xm_buffer, x, y );
    if (mask) {
@@ -1824,7 +1821,7 @@ static void write_span_rgb_HPCR_ximage( RGB_SPAN_ARGS )
  */
 static void write_span_LOOKUP_ximage( RGBA_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaImage *img = xmesa->xm_buffer->backimage;
    register GLuint i;
    LOOKUP_SETUP;
@@ -1850,7 +1847,7 @@ static void write_span_LOOKUP_ximage( RGBA_SPAN_ARGS )
  */
 static void write_span_rgb_LOOKUP_ximage( RGB_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaImage *img = xmesa->xm_buffer->backimage;
    register GLuint i;
    LOOKUP_SETUP;
@@ -1876,7 +1873,7 @@ static void write_span_rgb_LOOKUP_ximage( RGB_SPAN_ARGS )
  */
 static void write_span_LOOKUP8_ximage( RGBA_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    register GLuint i;
    register GLubyte *ptr = PIXELADDR1( xmesa->xm_buffer, x, y );
    LOOKUP_SETUP;
@@ -1901,7 +1898,7 @@ static void write_rgb_LOOKUP8_ximage( const GLcontext *ctx,
                                       CONST GLubyte rgb[][3],
                                       const GLubyte mask[] )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    register GLuint i;
    register GLubyte *ptr = PIXELADDR1( xmesa->xm_buffer, x, y );
    LOOKUP_SETUP;
@@ -1928,7 +1925,7 @@ static void write_rgb_LOOKUP8_ximage( const GLcontext *ctx,
  */
 static void write_span_GRAYSCALE_ximage( RGBA_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaImage *img = xmesa->xm_buffer->backimage;
    register GLuint i;
    y = FLIP(xmesa->xm_buffer, y);
@@ -1953,7 +1950,7 @@ static void write_span_GRAYSCALE_ximage( RGBA_SPAN_ARGS )
  */
 static void write_span_rgb_GRAYSCALE_ximage( RGB_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaImage *img = xmesa->xm_buffer->backimage;
    register GLuint i;
    y = FLIP(xmesa->xm_buffer, y);
@@ -1978,7 +1975,7 @@ static void write_span_rgb_GRAYSCALE_ximage( RGB_SPAN_ARGS )
  */
 static void write_span_GRAYSCALE8_ximage( RGBA_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    register GLuint i;
    register GLubyte *ptr = PIXELADDR1( xmesa->xm_buffer, x, y );
    if (mask) {
@@ -2002,7 +1999,7 @@ static void write_span_GRAYSCALE8_ximage( RGBA_SPAN_ARGS )
  */
 static void write_span_rgb_GRAYSCALE8_ximage( RGB_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    register GLuint i;
    register GLubyte *ptr = PIXELADDR1( xmesa->xm_buffer, x, y );
    if (mask) {
@@ -2038,7 +2035,7 @@ static void write_span_rgb_GRAYSCALE8_ximage( RGB_SPAN_ARGS )
  */
 static void write_pixels_TRUECOLOR_pixmap( RGBA_PIXEL_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaDisplay *dpy = xmesa->xm_visual->display;
    XMesaDrawable buffer = xmesa->xm_buffer->buffer;
    XMesaGC gc = xmesa->xm_buffer->gc;
@@ -2059,7 +2056,7 @@ static void write_pixels_TRUECOLOR_pixmap( RGBA_PIXEL_ARGS )
  */
 static void write_pixels_TRUEDITHER_pixmap( RGBA_PIXEL_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaDisplay *dpy = xmesa->xm_visual->display;
    XMesaDrawable buffer = xmesa->xm_buffer->buffer;
    XMesaGC gc = xmesa->xm_buffer->gc;
@@ -2080,7 +2077,7 @@ static void write_pixels_TRUEDITHER_pixmap( RGBA_PIXEL_ARGS )
  */
 static void write_pixels_8A8B8G8R_pixmap( RGBA_PIXEL_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaDisplay *dpy = xmesa->xm_visual->display;
    XMesaDrawable buffer = xmesa->xm_buffer->buffer;
    XMesaGC gc = xmesa->xm_buffer->gc;
@@ -2100,7 +2097,7 @@ static void write_pixels_8A8B8G8R_pixmap( RGBA_PIXEL_ARGS )
  */
 static void write_pixels_8R8G8B_pixmap( RGBA_PIXEL_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaDisplay *dpy = xmesa->xm_visual->display;
    XMesaDrawable buffer = xmesa->xm_buffer->buffer;
    XMesaGC gc = xmesa->xm_buffer->gc;
@@ -2119,7 +2116,7 @@ static void write_pixels_8R8G8B_pixmap( RGBA_PIXEL_ARGS )
  */
 static void write_pixels_8R8G8B24_pixmap( RGBA_PIXEL_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaDisplay *dpy = xmesa->xm_visual->display;
    XMesaDrawable buffer = xmesa->xm_buffer->buffer;
    XMesaGC gc = xmesa->xm_buffer->gc;
@@ -2138,7 +2135,7 @@ static void write_pixels_8R8G8B24_pixmap( RGBA_PIXEL_ARGS )
  */
 static void write_pixels_5R6G5B_pixmap( RGBA_PIXEL_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaDisplay *dpy = xmesa->xm_visual->display;
    XMesaDrawable buffer = xmesa->xm_buffer->buffer;
    XMesaGC gc = xmesa->xm_buffer->gc;
@@ -2157,7 +2154,7 @@ static void write_pixels_5R6G5B_pixmap( RGBA_PIXEL_ARGS )
  */
 static void write_pixels_DITHER_5R6G5B_pixmap( RGBA_PIXEL_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaDisplay *dpy = xmesa->xm_visual->display;
    XMesaDrawable buffer = xmesa->xm_buffer->buffer;
    XMesaGC gc = xmesa->xm_buffer->gc;
@@ -2178,7 +2175,7 @@ static void write_pixels_DITHER_5R6G5B_pixmap( RGBA_PIXEL_ARGS )
  */
 static void write_pixels_DITHER_pixmap( RGBA_PIXEL_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaDisplay *dpy = xmesa->xm_visual->display;
    XMesaDrawable buffer = xmesa->xm_buffer->buffer;
    XMesaGC gc = xmesa->xm_buffer->gc;
@@ -2199,7 +2196,7 @@ static void write_pixels_DITHER_pixmap( RGBA_PIXEL_ARGS )
  */
 static void write_pixels_1BIT_pixmap( RGBA_PIXEL_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaDisplay *dpy = xmesa->xm_visual->display;
    XMesaDrawable buffer = xmesa->xm_buffer->buffer;
    XMesaGC gc = xmesa->xm_buffer->gc;
@@ -2220,7 +2217,7 @@ static void write_pixels_1BIT_pixmap( RGBA_PIXEL_ARGS )
  */
 static void write_pixels_HPCR_pixmap( RGBA_PIXEL_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaDisplay *dpy = xmesa->xm_visual->display;
    XMesaDrawable buffer = xmesa->xm_buffer->buffer;
    XMesaGC gc = xmesa->xm_buffer->gc;
@@ -2240,7 +2237,7 @@ static void write_pixels_HPCR_pixmap( RGBA_PIXEL_ARGS )
  */
 static void write_pixels_LOOKUP_pixmap( RGBA_PIXEL_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaDisplay *dpy = xmesa->xm_visual->display;
    XMesaDrawable buffer = xmesa->xm_buffer->buffer;
    XMesaGC gc = xmesa->xm_buffer->gc;
@@ -2260,7 +2257,7 @@ static void write_pixels_LOOKUP_pixmap( RGBA_PIXEL_ARGS )
  */
 static void write_pixels_GRAYSCALE_pixmap( RGBA_PIXEL_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaDisplay *dpy = xmesa->xm_visual->display;
    XMesaDrawable buffer = xmesa->xm_buffer->buffer;
    XMesaGC gc = xmesa->xm_buffer->gc;
@@ -2279,7 +2276,7 @@ static void write_pixels_GRAYSCALE_pixmap( RGBA_PIXEL_ARGS )
  */
 static void write_pixels_TRUECOLOR_ximage( RGBA_PIXEL_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaImage *img = xmesa->xm_buffer->backimage;
    register GLuint i;
    for (i=0;i<n;i++) {
@@ -2297,7 +2294,7 @@ static void write_pixels_TRUECOLOR_ximage( RGBA_PIXEL_ARGS )
  */
 static void write_pixels_TRUEDITHER_ximage( RGBA_PIXEL_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaImage *img = xmesa->xm_buffer->backimage;
    register GLuint i;
    for (i=0;i<n;i++) {
@@ -2315,7 +2312,7 @@ static void write_pixels_TRUEDITHER_ximage( RGBA_PIXEL_ARGS )
  */
 static void write_pixels_8A8B8G8R_ximage( RGBA_PIXEL_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    register GLuint i;
    for (i=0;i<n;i++) {
       if (mask[i]) {
@@ -2331,7 +2328,7 @@ static void write_pixels_8A8B8G8R_ximage( RGBA_PIXEL_ARGS )
  */
 static void write_pixels_8R8G8B_ximage( RGBA_PIXEL_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    register GLuint i;
    for (i=0;i<n;i++) {
       if (mask[i]) {
@@ -2347,7 +2344,7 @@ static void write_pixels_8R8G8B_ximage( RGBA_PIXEL_ARGS )
  */
 static void write_pixels_8R8G8B24_ximage( RGBA_PIXEL_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    register GLuint i;
    for (i=0;i<n;i++) {
       if (mask[i]) {
@@ -2365,7 +2362,7 @@ static void write_pixels_8R8G8B24_ximage( RGBA_PIXEL_ARGS )
  */
 static void write_pixels_5R6G5B_ximage( RGBA_PIXEL_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    register GLuint i;
    for (i=0;i<n;i++) {
       if (mask[i]) {
@@ -2381,7 +2378,7 @@ static void write_pixels_5R6G5B_ximage( RGBA_PIXEL_ARGS )
  */
 static void write_pixels_DITHER_5R6G5B_ximage( RGBA_PIXEL_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    register GLuint i;
    for (i=0;i<n;i++) {
       if (mask[i]) {
@@ -2397,7 +2394,7 @@ static void write_pixels_DITHER_5R6G5B_ximage( RGBA_PIXEL_ARGS )
  */
 static void write_pixels_DITHER_ximage( RGBA_PIXEL_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaImage *img = xmesa->xm_buffer->backimage;
    register GLuint i;
    DITHER_SETUP;
@@ -2415,7 +2412,7 @@ static void write_pixels_DITHER_ximage( RGBA_PIXEL_ARGS )
  */
 static void write_pixels_DITHER8_ximage( RGBA_PIXEL_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    register GLuint i;
    DITHER_SETUP;
    for (i=0;i<n;i++) {
@@ -2432,7 +2429,7 @@ static void write_pixels_DITHER8_ximage( RGBA_PIXEL_ARGS )
  */
 static void write_pixels_1BIT_ximage( RGBA_PIXEL_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaImage *img = xmesa->xm_buffer->backimage;
    register GLuint i;
    SETUP_1BIT;
@@ -2450,7 +2447,7 @@ static void write_pixels_1BIT_ximage( RGBA_PIXEL_ARGS )
  */
 static void write_pixels_HPCR_ximage( RGBA_PIXEL_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    register GLuint i;
    for (i=0;i<n;i++) {
       if (mask[i]) {
@@ -2466,7 +2463,7 @@ static void write_pixels_HPCR_ximage( RGBA_PIXEL_ARGS )
  */
 static void write_pixels_LOOKUP_ximage( RGBA_PIXEL_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaImage *img = xmesa->xm_buffer->backimage;
    register GLuint i;
    LOOKUP_SETUP;
@@ -2483,7 +2480,7 @@ static void write_pixels_LOOKUP_ximage( RGBA_PIXEL_ARGS )
  */
 static void write_pixels_LOOKUP8_ximage( RGBA_PIXEL_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    register GLuint i;
    LOOKUP_SETUP;
    for (i=0;i<n;i++) {
@@ -2500,7 +2497,7 @@ static void write_pixels_LOOKUP8_ximage( RGBA_PIXEL_ARGS )
  */
 static void write_pixels_GRAYSCALE_ximage( RGBA_PIXEL_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaImage *img = xmesa->xm_buffer->backimage;
    register GLuint i;
    for (i=0;i<n;i++) {
@@ -2517,7 +2514,7 @@ static void write_pixels_GRAYSCALE_ximage( RGBA_PIXEL_ARGS )
  */
 static void write_pixels_GRAYSCALE8_ximage( RGBA_PIXEL_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    register GLuint i;
    for (i=0;i<n;i++) {
       if (mask[i]) {
@@ -2544,7 +2541,7 @@ static void write_pixels_GRAYSCALE8_ximage( RGBA_PIXEL_ARGS )
  */
 static void write_span_mono_pixmap( MONO_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaDisplay *dpy = xmesa->xm_visual->display;
    XMesaDrawable buffer = xmesa->xm_buffer->buffer;
    XMesaGC gc = xmesa->xm_buffer->gc;
@@ -2562,7 +2559,7 @@ static void write_span_mono_pixmap( MONO_SPAN_ARGS )
 
       /* Identify and emit contiguous rendered pixels
        */
-      while (i < n && mask[i])
+      while (i < n && (!mask || mask[i]))
         i++;
 
       if (start < i) 
@@ -2583,7 +2580,7 @@ static void write_span_mono_index_pixmap( const GLcontext *ctx, GLuint n,
                                           GLint x, GLint y, GLuint colorIndex,
                                           const GLubyte mask[] )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaDisplay *dpy = xmesa->xm_visual->display;
    XMesaDrawable buffer = xmesa->xm_buffer->buffer;
    XMesaGC gc = xmesa->xm_buffer->gc;
@@ -2618,7 +2615,7 @@ static void write_span_mono_index_pixmap( const GLcontext *ctx, GLuint n,
  */
 static void write_span_mono_TRUEDITHER_pixmap( MONO_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaDisplay *dpy = xmesa->xm_visual->display;
    XMesaDrawable buffer = xmesa->xm_buffer->buffer;
    XMesaGC gc = xmesa->xm_buffer->gc;
@@ -2641,7 +2638,7 @@ static void write_span_mono_TRUEDITHER_pixmap( MONO_SPAN_ARGS )
  */
 static void write_span_mono_DITHER_pixmap( MONO_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaDisplay *dpy = xmesa->xm_visual->display;
    XMesaDrawable buffer = xmesa->xm_buffer->buffer;
    XMesaGC gc = xmesa->xm_buffer->gc;
@@ -2663,7 +2660,7 @@ static void write_span_mono_DITHER_pixmap( MONO_SPAN_ARGS )
  */
 static void write_span_mono_1BIT_pixmap( MONO_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaDisplay *dpy = xmesa->xm_visual->display;
    XMesaDrawable buffer = xmesa->xm_buffer->buffer;
    XMesaGC gc = xmesa->xm_buffer->gc;
@@ -2685,7 +2682,7 @@ static void write_span_mono_1BIT_pixmap( MONO_SPAN_ARGS )
  */
 static void write_span_mono_ximage( MONO_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaImage *img = xmesa->xm_buffer->backimage;
    register GLuint i;
    const unsigned long pixel = xmesa_color_to_pixel(xmesa, color[RCOMP],
@@ -2704,7 +2701,7 @@ static void write_span_mono_index_ximage( const GLcontext *ctx, GLuint n,
                                           GLuint colorIndex,
                                           const GLubyte mask[] )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaImage *img = xmesa->xm_buffer->backimage;
    register GLuint i;
    y = FLIP(xmesa->xm_buffer, y);
@@ -2721,7 +2718,7 @@ static void write_span_mono_index_ximage( const GLcontext *ctx, GLuint n,
  */
 static void write_span_mono_TRUEDITHER_ximage( MONO_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaImage *img = xmesa->xm_buffer->backimage;
    const GLint r = color[RCOMP], g = color[GCOMP], b = color[BCOMP];
    GLuint i;
@@ -2741,7 +2738,7 @@ static void write_span_mono_TRUEDITHER_ximage( MONO_SPAN_ARGS )
  */
 static void write_span_mono_8A8B8G8R_ximage( MONO_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    GLuint i, *ptr;
    const unsigned long pixel = xmesa_color_to_pixel(xmesa, color[RCOMP],
                color[GCOMP], color[BCOMP], color[ACOMP], xmesa->pixelformat);
@@ -2759,12 +2756,12 @@ static void write_span_mono_8A8B8G8R_ximage( MONO_SPAN_ARGS )
  */
 static void write_span_mono_8R8G8B_ximage( MONO_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    const GLuint pixel = PACK_8R8G8B(color[RCOMP], color[GCOMP], color[BCOMP]);
    GLuint *ptr = PIXELADDR4( xmesa->xm_buffer, x, y );
    GLuint i;
    for (i=0;i<n;i++) {
-      if (mask[i]) {
+      if (!mask || mask[i]) {
         ptr[i] = pixel;
       }
    }
@@ -2776,7 +2773,7 @@ static void write_span_mono_8R8G8B_ximage( MONO_SPAN_ARGS )
  */
 static void write_span_mono_8R8G8B24_ximage( MONO_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    const GLubyte r = color[RCOMP];
    const GLubyte g = color[GCOMP];
    const GLubyte b = color[BCOMP];
@@ -2797,7 +2794,7 @@ static void write_span_mono_8R8G8B24_ximage( MONO_SPAN_ARGS )
  */
 static void write_span_mono_DITHER_ximage( MONO_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    const GLubyte r = color[RCOMP], g = color[GCOMP], b = color[BCOMP];
    XMesaImage *img = xmesa->xm_buffer->backimage;
    int yy = FLIP(xmesa->xm_buffer, y);
@@ -2816,7 +2813,7 @@ static void write_span_mono_DITHER_ximage( MONO_SPAN_ARGS )
  */
 static void write_span_mono_DITHER8_ximage( MONO_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    const GLubyte r = color[RCOMP], g = color[GCOMP], b = color[BCOMP];
    register GLubyte *ptr = PIXELADDR1( xmesa->xm_buffer,x,y);
    register GLuint i;
@@ -2834,7 +2831,7 @@ static void write_span_mono_DITHER8_ximage( MONO_SPAN_ARGS )
  */
 static void write_span_mono_LOOKUP8_ximage( MONO_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    register GLuint i;
    register GLubyte *ptr = PIXELADDR1( xmesa->xm_buffer,x,y);
    GLubyte pixel;
@@ -2853,7 +2850,7 @@ static void write_span_mono_LOOKUP8_ximage( MONO_SPAN_ARGS )
  */
 static void write_span_mono_1BIT_ximage( MONO_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    const GLubyte r = color[RCOMP], g = color[GCOMP], b = color[BCOMP];
    XMesaImage *img = xmesa->xm_buffer->backimage;
    register GLuint i;
@@ -2872,7 +2869,7 @@ static void write_span_mono_1BIT_ximage( MONO_SPAN_ARGS )
  */
 static void write_span_mono_HPCR_ximage( MONO_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    const GLubyte r = color[RCOMP], g = color[GCOMP], b = color[BCOMP];
    register GLubyte *ptr = PIXELADDR1( xmesa->xm_buffer,x,y);
    register GLuint i;
@@ -2889,7 +2886,7 @@ static void write_span_mono_HPCR_ximage( MONO_SPAN_ARGS )
  */
 static void write_span_mono_GRAYSCALE8_ximage( MONO_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    const GLubyte p = GRAY_RGB(color[RCOMP], color[GCOMP], color[BCOMP]);
    GLubyte *ptr = (GLubyte *) PIXELADDR1( xmesa->xm_buffer,x,y);
    GLuint i;
@@ -2907,7 +2904,7 @@ static void write_span_mono_GRAYSCALE8_ximage( MONO_SPAN_ARGS )
  */
 static void write_span_mono_DITHER_5R6G5B_ximage( MONO_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    register GLushort *ptr = PIXELADDR2( xmesa->xm_buffer, x, y );
    const GLint r = color[RCOMP], g = color[GCOMP], b = color[BCOMP];
    GLuint i;
@@ -2934,7 +2931,7 @@ static void write_span_mono_DITHER_5R6G5B_ximage( MONO_SPAN_ARGS )
  */
 static void write_pixels_mono_pixmap( MONO_PIXEL_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaDisplay *dpy = xmesa->xm_visual->display;
    XMesaDrawable buffer = xmesa->xm_buffer->buffer;
    XMesaGC gc = xmesa->xm_buffer->gc;
@@ -2957,7 +2954,7 @@ static void write_pixels_mono_index_pixmap(const GLcontext *ctx,
                                            GLuint colorIndex,
                                            const GLubyte mask[] )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaDisplay *dpy = xmesa->xm_visual->display;
    XMesaDrawable buffer = xmesa->xm_buffer->buffer;
    XMesaGC gc = xmesa->xm_buffer->gc;
@@ -2977,7 +2974,7 @@ static void write_pixels_mono_index_pixmap(const GLcontext *ctx,
  */
 static void write_pixels_mono_TRUEDITHER_pixmap( MONO_PIXEL_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaDisplay *dpy = xmesa->xm_visual->display;
    XMesaDrawable buffer = xmesa->xm_buffer->buffer;
    XMesaGC gc = xmesa->xm_buffer->gc;
@@ -3000,7 +2997,7 @@ static void write_pixels_mono_TRUEDITHER_pixmap( MONO_PIXEL_ARGS )
  */
 static void write_pixels_mono_DITHER_pixmap( MONO_PIXEL_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaDisplay *dpy = xmesa->xm_visual->display;
    XMesaDrawable buffer = xmesa->xm_buffer->buffer;
    XMesaGC gc = xmesa->xm_buffer->gc;
@@ -3021,7 +3018,7 @@ static void write_pixels_mono_DITHER_pixmap( MONO_PIXEL_ARGS )
  */
 static void write_pixels_mono_1BIT_pixmap( MONO_PIXEL_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaDisplay *dpy = xmesa->xm_visual->display;
    XMesaDrawable buffer = xmesa->xm_buffer->buffer;
    XMesaGC gc = xmesa->xm_buffer->gc;
@@ -3042,7 +3039,7 @@ static void write_pixels_mono_1BIT_pixmap( MONO_PIXEL_ARGS )
  */
 static void write_pixels_mono_ximage( MONO_PIXEL_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaImage *img = xmesa->xm_buffer->backimage;
    register GLuint i;
    const unsigned long pixel = xmesa_color_to_pixel(xmesa, color[RCOMP],
@@ -3060,7 +3057,7 @@ static void write_pixels_mono_index_ximage( const GLcontext *ctx, GLuint n,
                                             GLuint colorIndex,
                                             const GLubyte mask[] )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaImage *img = xmesa->xm_buffer->backimage;
    register GLuint i;
    for (i=0;i<n;i++) {
@@ -3076,7 +3073,7 @@ static void write_pixels_mono_index_ximage( const GLcontext *ctx, GLuint n,
  */
 static void write_pixels_mono_TRUEDITHER_ximage( MONO_PIXEL_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaImage *img = xmesa->xm_buffer->backimage;
    register GLuint i;
    const int r = color[RCOMP], g = color[GCOMP], b = color[BCOMP];
@@ -3096,7 +3093,7 @@ static void write_pixels_mono_TRUEDITHER_ximage( MONO_PIXEL_ARGS )
  */
 static void write_pixels_mono_8A8B8G8R_ximage( MONO_PIXEL_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    const GLuint p = PACK_8A8B8G8R(color[RCOMP], color[GCOMP],
                                   color[BCOMP], color[ACOMP]);
    register GLuint i;
@@ -3114,7 +3111,7 @@ static void write_pixels_mono_8A8B8G8R_ximage( MONO_PIXEL_ARGS )
  */
 static void write_pixels_mono_8R8G8B_ximage( MONO_PIXEL_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    register GLuint i;
    const GLuint p = PACK_8R8G8B(color[RCOMP], color[GCOMP], color[BCOMP]);
    for (i=0;i<n;i++) {
@@ -3131,7 +3128,7 @@ static void write_pixels_mono_8R8G8B_ximage( MONO_PIXEL_ARGS )
  */
 static void write_pixels_mono_8R8G8B24_ximage( MONO_PIXEL_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    const GLubyte r = color[RCOMP], g = color[GCOMP], b = color[BCOMP];
    register GLuint i;
    for (i=0;i<n;i++) {
@@ -3150,7 +3147,7 @@ static void write_pixels_mono_8R8G8B24_ximage( MONO_PIXEL_ARGS )
  */
 static void write_pixels_mono_DITHER_ximage( MONO_PIXEL_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    const GLubyte r = color[RCOMP], g = color[GCOMP], b = color[BCOMP];
    XMesaImage *img = xmesa->xm_buffer->backimage;
    register GLuint i;
@@ -3168,7 +3165,7 @@ static void write_pixels_mono_DITHER_ximage( MONO_PIXEL_ARGS )
  */
 static void write_pixels_mono_DITHER8_ximage( MONO_PIXEL_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    const GLubyte r = color[RCOMP], g = color[GCOMP], b = color[BCOMP];
    register GLuint i;
    DITHER_SETUP;
@@ -3186,7 +3183,7 @@ static void write_pixels_mono_DITHER8_ximage( MONO_PIXEL_ARGS )
  */
 static void write_pixels_mono_LOOKUP8_ximage( MONO_PIXEL_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    register GLuint i;
    GLubyte pixel;
    LOOKUP_SETUP;
@@ -3206,7 +3203,7 @@ static void write_pixels_mono_LOOKUP8_ximage( MONO_PIXEL_ARGS )
  */
 static void write_pixels_mono_1BIT_ximage( MONO_PIXEL_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    const GLubyte r = color[RCOMP], g = color[GCOMP], b = color[BCOMP];
    XMesaImage *img = xmesa->xm_buffer->backimage;
    register GLuint i;
@@ -3225,7 +3222,7 @@ static void write_pixels_mono_1BIT_ximage( MONO_PIXEL_ARGS )
  */
 static void write_pixels_mono_HPCR_ximage( MONO_PIXEL_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    const GLubyte r = color[RCOMP], g = color[GCOMP], b = color[BCOMP];
    register GLuint i;
    for (i=0;i<n;i++) {
@@ -3242,7 +3239,7 @@ static void write_pixels_mono_HPCR_ximage( MONO_PIXEL_ARGS )
  */
 static void write_pixels_mono_GRAYSCALE8_ximage( MONO_PIXEL_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    register GLuint i;
    register GLubyte p = GRAY_RGB(color[RCOMP], color[GCOMP], color[BCOMP]);
    for (i=0;i<n;i++) {
@@ -3259,7 +3256,7 @@ static void write_pixels_mono_GRAYSCALE8_ximage( MONO_PIXEL_ARGS )
  */
 static void write_pixels_mono_DITHER_5R6G5B_ximage( MONO_PIXEL_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    const int r = color[RCOMP], g = color[GCOMP], b = color[BCOMP];
    register GLuint i;
    for (i=0;i<n;i++) {
@@ -3290,7 +3287,7 @@ static void write_pixels_mono_DITHER_5R6G5B_ximage( MONO_PIXEL_ARGS )
  */
 static void write_span_index_pixmap( INDEX_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaDisplay *dpy = xmesa->xm_visual->display;
    XMesaDrawable buffer = xmesa->xm_buffer->buffer;
    XMesaGC gc = xmesa->xm_buffer->gc;
@@ -3318,7 +3315,7 @@ static void write_span_index_pixmap( INDEX_SPAN_ARGS )
  */
 static void write_span_index8_pixmap( INDEX8_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaDisplay *dpy = xmesa->xm_visual->display;
    XMesaDrawable buffer = xmesa->xm_buffer->buffer;
    XMesaGC gc = xmesa->xm_buffer->gc;
@@ -3346,7 +3343,7 @@ static void write_span_index8_pixmap( INDEX8_SPAN_ARGS )
  */
 static void write_span_index_ximage( INDEX_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaImage *img = xmesa->xm_buffer->backimage;
    register GLuint i;
    y = FLIP(xmesa->xm_buffer, y);
@@ -3368,11 +3365,9 @@ static void write_span_index_ximage( INDEX_SPAN_ARGS )
 /*
  * Write a span of 8-bit CI pixels to a non 8-bit XImage.
  */
-static void write_span_index8_ximage( const GLcontext *ctx, GLuint n,
-                                      GLint x, GLint y, const GLubyte index[],
-                                      const GLubyte mask[] )
+static void write_span_index8_ximage( INDEX8_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    if (mask) {
       GLuint i;
       for (i=0;i<n;i++) {
@@ -3392,11 +3387,9 @@ static void write_span_index8_ximage( const GLcontext *ctx, GLuint n,
 /*
  * Write a span of 8-bit CI pixels to an 8-bit XImage.
  */
-static void write_span_index8_ximage8( const GLcontext *ctx, GLuint n,
-                                      GLint x, GLint y, const GLubyte index[],
-                                      const GLubyte mask[] )
+static void write_span_index8_ximage8( INDEX8_SPAN_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    GLubyte *dst = PIXELADDR1( xmesa->xm_buffer,x,y);
    if (mask) {
       GLuint i;
@@ -3427,7 +3420,7 @@ static void write_span_index8_ximage8( const GLcontext *ctx, GLuint n,
  */
 static void write_pixels_index_pixmap( INDEX_PIXELS_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaDisplay *dpy = xmesa->xm_visual->display;
    XMesaDrawable buffer = xmesa->xm_buffer->buffer;
    XMesaGC gc = xmesa->xm_buffer->gc;
@@ -3446,7 +3439,7 @@ static void write_pixels_index_pixmap( INDEX_PIXELS_ARGS )
  */
 static void write_pixels_index_ximage( INDEX_PIXELS_ARGS )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaImage *img = xmesa->xm_buffer->backimage;
    register GLuint i;
    for (i=0;i<n;i++) {
@@ -3471,7 +3464,7 @@ static void write_pixels_index_ximage( INDEX_PIXELS_ARGS )
 static void read_index_span( const GLcontext *ctx,
                             GLuint n, GLint x, GLint y, GLuint index[] )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaBuffer source = xmesa->xm_buffer;
    GLuint i;
 
@@ -3522,7 +3515,7 @@ static void read_color_span( const GLcontext *ctx,
                             GLuint n, GLint x, GLint y,
                              GLubyte rgba[][4] )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaBuffer source = xmesa->xm_buffer;
 
    if (source->buffer) {
@@ -3544,8 +3537,8 @@ static void read_color_span( const GLcontext *ctx,
 #endif
       if (span && !error) {
         switch (xmesa->pixelformat) {
-           case PF_TRUECOLOR:
-           case PF_TRUEDITHER:
+           case PF_Truecolor:
+           case PF_Dither_True:
                {
                   const GLubyte *pixelToR = xmesa->xm_visual->PixelToR;
                   const GLubyte *pixelToG = xmesa->xm_visual->PixelToG;
@@ -3568,7 +3561,7 @@ static void read_color_span( const GLcontext *ctx,
                }
               break;
             case PF_5R6G5B:
-            case PF_DITHER_5R6G5B:
+            case PF_Dither_5R6G5B:
                {
                   const GLubyte *pixelToR = xmesa->xm_visual->PixelToR;
                   const GLubyte *pixelToG = xmesa->xm_visual->PixelToG;
@@ -3639,9 +3632,9 @@ static void read_color_span( const GLcontext *ctx,
                   }
                }
                break;
-           case PF_DITHER:
-           case PF_LOOKUP:
-           case PF_GRAYSCALE:
+           case PF_Dither:
+           case PF_Lookup:
+           case PF_Grayscale:
                {
                   GLubyte *rTable = source->pixel_to_r;
                   GLubyte *gTable = source->pixel_to_g;
@@ -3669,7 +3662,7 @@ static void read_color_span( const GLcontext *ctx,
                   }
                }
               break;
-           case PF_1BIT:
+           case PF_1Bit:
                {
                   int bitFlip = xmesa->xm_visual->bitFlip;
                   GLuint i;
@@ -3702,8 +3695,8 @@ static void read_color_span( const GLcontext *ctx,
    else if (source->backimage) {
       /* Read from XImage back buffer */
       switch (xmesa->pixelformat) {
-         case PF_TRUECOLOR:
-         case PF_TRUEDITHER:
+         case PF_Truecolor:
+         case PF_Dither_True:
             {
                const GLubyte *pixelToR = xmesa->xm_visual->PixelToR;
                const GLubyte *pixelToG = xmesa->xm_visual->PixelToG;
@@ -3728,7 +3721,7 @@ static void read_color_span( const GLcontext *ctx,
             }
             break;
          case PF_5R6G5B:
-         case PF_DITHER_5R6G5B:
+         case PF_Dither_5R6G5B:
             {
                const GLubyte *pixelToR = xmesa->xm_visual->PixelToR;
                const GLubyte *pixelToG = xmesa->xm_visual->PixelToG;
@@ -3826,9 +3819,9 @@ static void read_color_span( const GLcontext *ctx,
                }
             }
             break;
-        case PF_DITHER:
-        case PF_LOOKUP:
-        case PF_GRAYSCALE:
+        case PF_Dither:
+        case PF_Lookup:
+        case PF_Grayscale:
             {
                const GLubyte *rTable = source->pixel_to_r;
                const GLubyte *gTable = source->pixel_to_g;
@@ -3858,7 +3851,7 @@ static void read_color_span( const GLcontext *ctx,
                }
             }
            break;
-        case PF_1BIT:
+        case PF_1Bit:
             {
                XMesaImage *img = source->backimage;
                int bitFlip = xmesa->xm_visual->bitFlip;
@@ -3890,7 +3883,7 @@ static void read_index_pixels( const GLcontext *ctx,
                               GLuint n, const GLint x[], const GLint y[],
                                GLuint indx[], const GLubyte mask[] )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    register GLuint i;
    XMesaBuffer source = xmesa->xm_buffer;
 
@@ -3919,7 +3912,7 @@ static void read_color_pixels( const GLcontext *ctx,
                               GLuint n, const GLint x[], const GLint y[],
                                GLubyte rgba[][4], const GLubyte mask[] )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    XMesaDisplay *dpy = xmesa->xm_visual->display;
    register GLuint i;
    XMesaBuffer source = xmesa->xm_buffer;
@@ -3927,10 +3920,10 @@ static void read_color_pixels( const GLcontext *ctx,
 
    if (source->buffer) {
       switch (xmesa->pixelformat) {
-        case PF_TRUECOLOR:
-         case PF_TRUEDITHER:
+        case PF_Truecolor:
+         case PF_Dither_True:
          case PF_5R6G5B:
-         case PF_DITHER_5R6G5B:
+         case PF_Dither_5R6G5B:
             {
                unsigned long rMask = GET_REDMASK(xmesa->xm_visual);
                unsigned long gMask = GET_GREENMASK(xmesa->xm_visual);
@@ -4003,9 +3996,9 @@ static void read_color_pixels( const GLcontext *ctx,
                }
             }
             break;
-        case PF_DITHER:
-        case PF_LOOKUP:
-        case PF_GRAYSCALE:
+        case PF_Dither:
+        case PF_Lookup:
+        case PF_Grayscale:
             {
                GLubyte *rTable = source->pixel_to_r;
                GLubyte *gTable = source->pixel_to_g;
@@ -4022,7 +4015,7 @@ static void read_color_pixels( const GLcontext *ctx,
                }
            }
            break;
-        case PF_1BIT:
+        case PF_1Bit:
             {
                int bitFlip = xmesa->xm_visual->bitFlip;
                for (i=0;i<n;i++) {
@@ -4044,10 +4037,10 @@ static void read_color_pixels( const GLcontext *ctx,
    }
    else if (source->backimage) {
       switch (xmesa->pixelformat) {
-        case PF_TRUECOLOR:
-         case PF_TRUEDITHER:
+        case PF_Truecolor:
+         case PF_Dither_True:
          case PF_5R6G5B:
-         case PF_DITHER_5R6G5B:
+         case PF_Dither_5R6G5B:
             {
                unsigned long rMask = GET_REDMASK(xmesa->xm_visual);
                unsigned long gMask = GET_GREENMASK(xmesa->xm_visual);
@@ -4118,9 +4111,9 @@ static void read_color_pixels( const GLcontext *ctx,
                }
             }
             break;
-        case PF_DITHER:
-        case PF_LOOKUP:
-        case PF_GRAYSCALE:
+        case PF_Dither:
+        case PF_Lookup:
+        case PF_Grayscale:
             {
                GLubyte *rTable = source->pixel_to_r;
                GLubyte *gTable = source->pixel_to_g;
@@ -4138,7 +4131,7 @@ static void read_color_pixels( const GLcontext *ctx,
                }
            }
            break;
-        case PF_1BIT:
+        case PF_1Bit:
             {
                XMesaImage *img = source->backimage;
                int bitFlip = xmesa->xm_visual->bitFlip;
@@ -4163,14 +4156,17 @@ static void read_color_pixels( const GLcontext *ctx,
 
 
 static void
-clear_color_HPCR_ximage( GLcontext *ctx, const GLchan color[4] )
+clear_color_HPCR_ximage( GLcontext *ctx, const GLfloat color[4] )
 {
    int i;
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
 
-   COPY_4V(xmesa->clearcolor, color);
+   CLAMPED_FLOAT_TO_UBYTE(xmesa->clearcolor[0], color[0]);
+   CLAMPED_FLOAT_TO_UBYTE(xmesa->clearcolor[1], color[1]);
+   CLAMPED_FLOAT_TO_UBYTE(xmesa->clearcolor[2], color[2]);
+   CLAMPED_FLOAT_TO_UBYTE(xmesa->clearcolor[3], color[3]);
 
-   if (color[0] == 0 && color[1] == 0 && color[2] == 0) {
+   if (color[0] == 0.0 && color[1] == 0.0 && color[2] == 0.0) {
       /* black is black */
       MEMSET( xmesa->xm_visual->hpcr_clear_ximage_pattern, 0x0 ,
               sizeof(xmesa->xm_visual->hpcr_clear_ximage_pattern));
@@ -4178,24 +4174,33 @@ clear_color_HPCR_ximage( GLcontext *ctx, const GLchan color[4] )
    else {
       /* build clear pattern */
       for (i=0; i<16; i++) {
-         xmesa->xm_visual->hpcr_clear_ximage_pattern[0][i]    =
-            DITHER_HPCR(i, 0, color[0], color[1], color[2]);
+         xmesa->xm_visual->hpcr_clear_ximage_pattern[0][i] =
+            DITHER_HPCR(i, 0,
+                        xmesa->clearcolor[0],
+                        xmesa->clearcolor[1],
+                        xmesa->clearcolor[2]);
          xmesa->xm_visual->hpcr_clear_ximage_pattern[1][i]    =
-            DITHER_HPCR(i, 1, color[0], color[1], color[2]);
+            DITHER_HPCR(i, 1,
+                        xmesa->clearcolor[0],
+                        xmesa->clearcolor[1],
+                        xmesa->clearcolor[2]);
       }
    }
 }
 
 
 static void
-clear_color_HPCR_pixmap( GLcontext *ctx, const GLchan color[4] )
+clear_color_HPCR_pixmap( GLcontext *ctx, const GLfloat color[4] )
 {
    int i;
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
 
-   COPY_4V(xmesa->clearcolor, color);
+   CLAMPED_FLOAT_TO_UBYTE(xmesa->clearcolor[0], color[0]);
+   CLAMPED_FLOAT_TO_UBYTE(xmesa->clearcolor[1], color[1]);
+   CLAMPED_FLOAT_TO_UBYTE(xmesa->clearcolor[2], color[2]);
+   CLAMPED_FLOAT_TO_UBYTE(xmesa->clearcolor[3], color[3]);
 
-   if (color[0] == 0 && color[1] == 0 && color[2] == 0) {
+   if (color[0] == 0.0 && color[1] == 0.0 && color[2] == 0.0) {
       /* black is black */
       for (i=0; i<16; i++) {
          XMesaPutPixel(xmesa->xm_visual->hpcr_clear_ximage, i, 0, 0);
@@ -4205,9 +4210,15 @@ clear_color_HPCR_pixmap( GLcontext *ctx, const GLchan color[4] )
    else {
       for (i=0; i<16; i++) {
          XMesaPutPixel(xmesa->xm_visual->hpcr_clear_ximage, i, 0,
-                       DITHER_HPCR(i, 0, color[0], color[1], color[2]));
+                       DITHER_HPCR(i, 0,
+                                   xmesa->clearcolor[0],
+                                   xmesa->clearcolor[1],
+                                   xmesa->clearcolor[2]));
          XMesaPutPixel(xmesa->xm_visual->hpcr_clear_ximage, i, 1,
-                       DITHER_HPCR(i, 1, color[0], color[1], color[2]));
+                       DITHER_HPCR(i, 1,
+                                   xmesa->clearcolor[0],
+                                   xmesa->clearcolor[1],
+                                   xmesa->clearcolor[2]));
       }
    }
    /* change tile pixmap content */
@@ -4221,7 +4232,7 @@ clear_color_HPCR_pixmap( GLcontext *ctx, const GLchan color[4] )
 
 void xmesa_update_span_funcs( GLcontext *ctx )
 {
-   XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   XMesaContext xmesa = XMESA_CONTEXT(ctx);
    int depth=GET_VISUAL_DEPTH(xmesa->xm_visual);
    struct swrast_device_driver *dd = _swrast_GetDeviceDriverReference( ctx );
 
@@ -4231,21 +4242,21 @@ void xmesa_update_span_funcs( GLcontext *ctx )
    if (xmesa->xm_buffer->buffer!=XIMAGE) {
       /* Writing to window or back pixmap */
       switch (xmesa->pixelformat) {
-        case PF_INDEX:
+        case PF_Index:
            dd->WriteCI32Span     = write_span_index_pixmap;
            dd->WriteCI8Span      = write_span_index8_pixmap;
            dd->WriteMonoCISpan   = write_span_mono_index_pixmap;
            dd->WriteCI32Pixels   = write_pixels_index_pixmap;
            dd->WriteMonoCIPixels = write_pixels_mono_index_pixmap;
            break;
-        case PF_TRUECOLOR:
+        case PF_Truecolor:
            dd->WriteRGBASpan       = write_span_TRUECOLOR_pixmap;
            dd->WriteRGBSpan        = write_span_rgb_TRUECOLOR_pixmap;
            dd->WriteMonoRGBASpan   = write_span_mono_pixmap;
            dd->WriteRGBAPixels     = write_pixels_TRUECOLOR_pixmap;
            dd->WriteMonoRGBAPixels = write_pixels_mono_pixmap;
            break;
-        case PF_TRUEDITHER:
+        case PF_Dither_True:
            dd->WriteRGBASpan       = write_span_TRUEDITHER_pixmap;
            dd->WriteRGBSpan        = write_span_rgb_TRUEDITHER_pixmap;
            dd->WriteMonoRGBASpan   = write_span_mono_TRUEDITHER_pixmap;
@@ -4280,21 +4291,21 @@ void xmesa_update_span_funcs( GLcontext *ctx )
            dd->WriteRGBAPixels     = write_pixels_5R6G5B_pixmap;
            dd->WriteMonoRGBAPixels = write_pixels_mono_pixmap;
            break;
-        case PF_DITHER_5R6G5B:
+        case PF_Dither_5R6G5B:
            dd->WriteRGBASpan       = write_span_DITHER_5R6G5B_pixmap;
            dd->WriteRGBSpan        = write_span_rgb_DITHER_5R6G5B_pixmap;
            dd->WriteMonoRGBASpan   = write_span_mono_TRUEDITHER_pixmap;
            dd->WriteRGBAPixels     = write_pixels_DITHER_5R6G5B_pixmap;
            dd->WriteMonoRGBAPixels = write_pixels_mono_TRUEDITHER_pixmap;
            break;
-        case PF_DITHER:
+        case PF_Dither:
            dd->WriteRGBASpan       = write_span_DITHER_pixmap;
            dd->WriteRGBSpan        = write_span_rgb_DITHER_pixmap;
            dd->WriteMonoRGBASpan   = write_span_mono_DITHER_pixmap;
            dd->WriteRGBAPixels     = write_pixels_DITHER_pixmap;
            dd->WriteMonoRGBAPixels = write_pixels_mono_DITHER_pixmap;
            break;
-        case PF_1BIT:
+        case PF_1Bit:
            dd->WriteRGBASpan       = write_span_1BIT_pixmap;
            dd->WriteRGBSpan        = write_span_rgb_1BIT_pixmap;
            dd->WriteMonoRGBASpan   = write_span_mono_1BIT_pixmap;
@@ -4311,14 +4322,14 @@ void xmesa_update_span_funcs( GLcontext *ctx )
               ctx->Driver.ClearColor = clear_color_HPCR_pixmap;
            }
             break;
-         case PF_LOOKUP:
+         case PF_Lookup:
             dd->WriteRGBASpan       = write_span_LOOKUP_pixmap;
             dd->WriteRGBSpan        = write_span_rgb_LOOKUP_pixmap;
             dd->WriteMonoRGBASpan   = write_span_mono_pixmap;
             dd->WriteRGBAPixels     = write_pixels_LOOKUP_pixmap;
             dd->WriteMonoRGBAPixels = write_pixels_mono_pixmap;
             break;
-         case PF_GRAYSCALE:
+         case PF_Grayscale:
             dd->WriteRGBASpan       = write_span_GRAYSCALE_pixmap;
             dd->WriteRGBSpan        = write_span_rgb_GRAYSCALE_pixmap;
             dd->WriteMonoRGBASpan   = write_span_mono_pixmap;
@@ -4333,7 +4344,7 @@ void xmesa_update_span_funcs( GLcontext *ctx )
    else if (xmesa->xm_buffer->buffer==XIMAGE) {
       /* Writing to back XImage */
       switch (xmesa->pixelformat) {
-        case PF_INDEX:
+        case PF_Index:
            dd->WriteCI32Span     = write_span_index_ximage;
            if (depth==8)
                dd->WriteCI8Span   = write_span_index8_ximage8;
@@ -4343,7 +4354,7 @@ void xmesa_update_span_funcs( GLcontext *ctx )
            dd->WriteCI32Pixels   = write_pixels_index_ximage;
            dd->WriteMonoCIPixels = write_pixels_mono_index_ximage;
            break;
-        case PF_TRUECOLOR:
+        case PF_Truecolor:
            /* Generic RGB */
            dd->WriteRGBASpan       = write_span_TRUECOLOR_ximage;
            dd->WriteRGBSpan        = write_span_rgb_TRUECOLOR_ximage;
@@ -4351,7 +4362,7 @@ void xmesa_update_span_funcs( GLcontext *ctx )
            dd->WriteRGBAPixels     = write_pixels_TRUECOLOR_ximage;
            dd->WriteMonoRGBAPixels = write_pixels_mono_ximage;
            break;
-        case PF_TRUEDITHER:
+        case PF_Dither_True:
            dd->WriteRGBASpan       = write_span_TRUEDITHER_ximage;
            dd->WriteRGBSpan        = write_span_rgb_TRUEDITHER_ximage;
            dd->WriteMonoRGBASpan   = write_span_mono_TRUEDITHER_ximage;
@@ -4386,14 +4397,14 @@ void xmesa_update_span_funcs( GLcontext *ctx )
            dd->WriteRGBAPixels     = write_pixels_5R6G5B_ximage;
            dd->WriteMonoRGBAPixels = write_pixels_mono_ximage;
            break;
-        case PF_DITHER_5R6G5B:
+        case PF_Dither_5R6G5B:
            dd->WriteRGBASpan       = write_span_DITHER_5R6G5B_ximage;
            dd->WriteRGBSpan        = write_span_rgb_DITHER_5R6G5B_ximage;
            dd->WriteMonoRGBASpan   = write_span_mono_DITHER_5R6G5B_ximage;
            dd->WriteRGBAPixels     = write_pixels_DITHER_5R6G5B_ximage;
            dd->WriteMonoRGBAPixels = write_pixels_mono_DITHER_5R6G5B_ximage;
            break;
-        case PF_DITHER:
+        case PF_Dither:
            if (depth==8) {
               dd->WriteRGBASpan      = write_span_DITHER8_ximage;
               dd->WriteRGBSpan       = write_span_rgb_DITHER8_ximage;
@@ -4409,7 +4420,7 @@ void xmesa_update_span_funcs( GLcontext *ctx )
               dd->WriteMonoRGBAPixels = write_pixels_mono_DITHER_ximage;
            }
            break;
-        case PF_1BIT:
+        case PF_1Bit:
            dd->WriteRGBASpan       = write_span_1BIT_ximage;
            dd->WriteRGBSpan        = write_span_rgb_1BIT_ximage;
            dd->WriteMonoRGBASpan   = write_span_mono_1BIT_ximage;
@@ -4426,7 +4437,7 @@ void xmesa_update_span_funcs( GLcontext *ctx )
                ctx->Driver.ClearColor = clear_color_HPCR_ximage;
            }
             break;
-         case PF_LOOKUP:
+         case PF_Lookup:
            if (depth==8) {
                dd->WriteRGBASpan       = write_span_LOOKUP8_ximage;
                dd->WriteRGBSpan        = write_rgb_LOOKUP8_ximage;
@@ -4442,7 +4453,7 @@ void xmesa_update_span_funcs( GLcontext *ctx )
                dd->WriteMonoRGBAPixels = write_pixels_mono_ximage;
             }
             break;
-         case PF_GRAYSCALE:
+         case PF_Grayscale:
            if (depth==8) {
               dd->WriteRGBASpan       = write_span_GRAYSCALE8_ximage;
               dd->WriteRGBSpan        = write_span_rgb_GRAYSCALE8_ximage;