newly organized Xlib driver files

1 files changed, 1006 insertions, 0 deletions

diff --git a/src/mesa/drivers/x11/xm_dd.c b/src/mesa/drivers/x11/xm_dd.c
new file mode 100644
index 00000000000..271cb13f083
--- /dev/null
+++ b/src/mesa/drivers/x11/xm_dd.c
@@ -0,0 +1,1006 @@
+/* $Id: xm_dd.c,v 1.1 2000/09/07 15:40:30 brianp Exp $ */
+
+/*
+ * Mesa 3-D graphics library
+ * Version:  3.3
+ * 
+ * Copyright (C) 1999-2000  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"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+
+#include "glxheader.h"
+#include "context.h"
+#include "drawpix.h"
+#include "mem.h"
+#include "state.h"
+#include "depth.h"
+#include "macros.h"
+#include "vb.h"
+#include "types.h"
+#include "xmesaP.h"
+#include "extensions.h"
+
+
+/*
+ * Return the size (width,height of the current color buffer.
+ * This function should be called by the glViewport function because
+ * glViewport is often called when the window gets resized.  We need to
+ * update some X/Mesa stuff when that happens.
+ * Output:  width - width of buffer in pixels.
+ *          height - height of buffer in pixels.
+ */
+static void
+get_buffer_size( GLcontext *ctx, GLuint *width, GLuint *height )
+{
+   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   unsigned int winwidth, winheight;
+#ifndef XFree86Server
+   Window root;
+   int winx, winy;
+   unsigned int bw, d;
+
+   _glthread_LOCK_MUTEX(_xmesa_lock);
+   XGetGeometry( xmesa->display, xmesa->xm_buffer->frontbuffer, &root,
+		 &winx, &winy, &winwidth, &winheight, &bw, &d );
+   _glthread_UNLOCK_MUTEX(_xmesa_lock);
+#else
+
+   winwidth = xmesa->xm_buffer->frontbuffer->width;
+   winheight = xmesa->xm_buffer->frontbuffer->height;
+#endif
+
+   *width = winwidth;
+   *height = winheight;
+
+   if (   winwidth!=xmesa->xm_buffer->width
+       || winheight!=xmesa->xm_buffer->height) {
+      xmesa->xm_buffer->width = winwidth;
+      xmesa->xm_buffer->height = winheight;
+      xmesa_alloc_back_buffer( xmesa->xm_buffer );
+   }
+
+   /* Needed by FLIP macro */
+   xmesa->xm_buffer->bottom = (int) winheight - 1;
+
+   if (xmesa->xm_buffer->backimage) {
+      /* Needed by PIXELADDR1 macro */
+      xmesa->xm_buffer->ximage_width1
+                  = xmesa->xm_buffer->backimage->bytes_per_line;
+      xmesa->xm_buffer->ximage_origin1
+                  = (GLubyte *) xmesa->xm_buffer->backimage->data
+                    + xmesa->xm_buffer->ximage_width1 * (winheight-1);
+
+      /* Needed by PIXELADDR2 macro */
+      xmesa->xm_buffer->ximage_width2
+                  = xmesa->xm_buffer->backimage->bytes_per_line / 2;
+      xmesa->xm_buffer->ximage_origin2
+                  = (GLushort *) xmesa->xm_buffer->backimage->data
+                    + xmesa->xm_buffer->ximage_width2 * (winheight-1);
+
+      /* Needed by PIXELADDR3 macro */
+      xmesa->xm_buffer->ximage_width3
+                  = xmesa->xm_buffer->backimage->bytes_per_line;
+      xmesa->xm_buffer->ximage_origin3
+                  = (GLubyte *) xmesa->xm_buffer->backimage->data
+                    + xmesa->xm_buffer->ximage_width3 * (winheight-1);
+
+      /* Needed by PIXELADDR4 macro */
+      xmesa->xm_buffer->ximage_width4 = xmesa->xm_buffer->backimage->width;
+      xmesa->xm_buffer->ximage_origin4
+                  = (GLuint *) xmesa->xm_buffer->backimage->data
+                    + xmesa->xm_buffer->ximage_width4 * (winheight-1);
+   }
+}
+
+
+static void
+finish( GLcontext *ctx )
+{
+#ifdef XFree86Server
+      /* NOT_NEEDED */
+#else
+   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   if (xmesa) {
+      _glthread_LOCK_MUTEX(_xmesa_lock);
+      XSync( xmesa->display, False );
+      _glthread_UNLOCK_MUTEX(_xmesa_lock);
+   }
+#endif
+}
+
+
+static void
+flush( GLcontext *ctx )
+{
+#ifdef XFree86Server
+      /* NOT_NEEDED */
+#else
+   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   if (xmesa) {
+      _glthread_LOCK_MUTEX(_xmesa_lock);
+      XFlush( xmesa->display );
+      _glthread_UNLOCK_MUTEX(_xmesa_lock);
+   }
+#endif
+}
+
+
+#if 0
+static GLboolean
+set_buffer( GLcontext *ctx, GLenum mode )
+{
+   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   if (mode == GL_FRONT_LEFT) {
+      /* read/write front buffer */
+      xmesa->xm_buffer->buffer = xmesa->xm_buffer->frontbuffer;
+      ctx->NewState |= NEW_RASTER_OPS;
+      gl_update_state(ctx);
+      return GL_TRUE;
+   }
+   else if (mode==GL_BACK_LEFT && xmesa->xm_buffer->db_state) {
+      /* read/write back buffer */
+      if (xmesa->xm_buffer->backpixmap) {
+         xmesa->xm_buffer->buffer =
+	     (XMesaDrawable)xmesa->xm_buffer->backpixmap;
+      }
+      else if (xmesa->xm_buffer->backimage) {
+         xmesa->xm_buffer->buffer = None;
+      }
+      else {
+         /* just in case there wasn't enough memory for back buffer */
+         xmesa->xm_buffer->buffer = xmesa->xm_buffer->frontbuffer;
+      }
+      ctx->NewState |= NEW_RASTER_OPS;
+      gl_update_state(ctx);
+      return GL_TRUE;
+   }
+   else {
+      return GL_FALSE;
+   }
+}
+#endif
+
+
+static GLboolean
+set_draw_buffer( GLcontext *ctx, GLenum mode )
+{
+   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   if (mode == GL_FRONT_LEFT) {
+      /* write to front buffer */
+      xmesa->xm_buffer->buffer = xmesa->xm_buffer->frontbuffer;
+      xmesa_update_span_funcs(ctx);
+      return GL_TRUE;
+   }
+   else if (mode==GL_BACK_LEFT && xmesa->xm_buffer->db_state) {
+      /* write to back buffer */
+      if (xmesa->xm_buffer->backpixmap) {
+         xmesa->xm_buffer->buffer =
+	     (XMesaDrawable)xmesa->xm_buffer->backpixmap;
+      }
+      else if (xmesa->xm_buffer->backimage) {
+         xmesa->xm_buffer->buffer = None;
+      }
+      else {
+         /* just in case there wasn't enough memory for back buffer */
+         xmesa->xm_buffer->buffer = xmesa->xm_buffer->frontbuffer;
+      }
+      xmesa_update_span_funcs(ctx);
+      return GL_TRUE;
+   }
+   else {
+      return GL_FALSE;
+   }
+}
+
+
+static void
+set_read_buffer( GLcontext *ctx, GLframebuffer *buffer, GLenum mode )
+{
+   XMesaBuffer target;
+   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+
+   if (buffer == ctx->DrawBuffer) {
+      target = xmesa->xm_buffer;
+      xmesa->use_read_buffer = GL_FALSE;
+   }
+   else {
+      ASSERT(buffer == ctx->ReadBuffer);
+      target = xmesa->xm_read_buffer;
+      xmesa->use_read_buffer = GL_TRUE;
+   }
+
+   if (mode == GL_FRONT_LEFT) {
+      target->buffer = target->frontbuffer;
+      xmesa_update_span_funcs(ctx);
+   }
+   else if (mode==GL_BACK_LEFT && xmesa->xm_read_buffer->db_state) {
+      if (target->backpixmap) {
+         target->buffer = (XMesaDrawable)xmesa->xm_buffer->backpixmap;
+      }
+      else if (target->backimage) {
+         target->buffer = None;
+      }
+      else {
+         /* just in case there wasn't enough memory for back buffer */
+         target->buffer = target->frontbuffer;
+      }
+      xmesa_update_span_funcs(ctx);
+   }
+   else {
+      gl_problem(ctx, "invalid buffer in set_read_buffer() in xmesa2.c");
+   }
+}
+
+
+
+static void
+clear_index( GLcontext *ctx, GLuint index )
+{
+   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   xmesa->clearpixel = (unsigned long) index;
+   XMesaSetForeground( xmesa->display, xmesa->xm_buffer->cleargc,
+                       (unsigned long) index );
+}
+
+
+static void
+clear_color( GLcontext *ctx, GLubyte r, GLubyte g, GLubyte b, GLubyte a )
+{
+   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   xmesa->clearcolor[0] = r;
+   xmesa->clearcolor[1] = g;
+   xmesa->clearcolor[2] = b;
+   xmesa->clearcolor[3] = a;
+   xmesa->clearpixel = xmesa_color_to_pixel( xmesa, r, g, b, a,
+                                             xmesa->xm_visual->undithered_pf );
+   _glthread_LOCK_MUTEX(_xmesa_lock);
+   XMesaSetForeground( xmesa->display, xmesa->xm_buffer->cleargc,
+                       xmesa->clearpixel );
+   _glthread_UNLOCK_MUTEX(_xmesa_lock);
+}
+
+
+
+/* Set current color index */
+static void
+set_index( GLcontext *ctx, GLuint index )
+{
+   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   unsigned long p = (unsigned long) index;
+   xmesa->pixel = p;
+   XMesaSetForeground( xmesa->display, xmesa->xm_buffer->gc1, p );
+}
+
+
+
+/* Set current drawing color */
+static void
+set_color( GLcontext *ctx, GLubyte r, GLubyte g, GLubyte b, GLubyte a )
+{
+   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   xmesa->red   = r;
+   xmesa->green = g;
+   xmesa->blue  = b;
+   xmesa->alpha = a;
+   xmesa->pixel = xmesa_color_to_pixel( xmesa, r, g, b, a, xmesa->pixelformat );;
+   XMesaSetForeground( xmesa->display, xmesa->xm_buffer->gc1, xmesa->pixel );
+}
+
+
+
+/* Set index mask ala glIndexMask */
+static void
+index_mask( GLcontext *ctx, GLuint mask )
+{
+   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   if (xmesa->xm_buffer->buffer != XIMAGE) {
+      unsigned long m;
+      if (mask==0xffffffff) {
+	 m = ((unsigned long)~0L);
+      }
+      else {
+         m = (unsigned long) mask;
+      }
+      XMesaSetPlaneMask( xmesa->display, xmesa->xm_buffer->cleargc, m );
+   }
+}
+
+
+/* Implements glColorMask() */
+static void
+color_mask(GLcontext *ctx,
+           GLboolean rmask, GLboolean gmask, GLboolean bmask, GLboolean amask)
+{
+   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   int xclass = GET_VISUAL_CLASS(xmesa->xm_visual);
+   (void) amask;
+
+   if (xmesa->xm_buffer->buffer != XIMAGE
+       && (xclass == TrueColor || xclass == DirectColor)) {
+      unsigned long m;
+      if (rmask && gmask && bmask) {
+         m = ((unsigned long)~0L);
+      }
+      else {
+         m = 0;
+         if (rmask)   m |= GET_REDMASK(xmesa->xm_visual);
+         if (gmask)   m |= GET_GREENMASK(xmesa->xm_visual);
+         if (bmask)   m |= GET_BLUEMASK(xmesa->xm_visual);
+      }
+      XMesaSetPlaneMask( xmesa->display, xmesa->xm_buffer->cleargc, m );
+   }
+}
+
+
+/*
+ * Enable/disable dithering
+ */
+static void
+dither( GLcontext *ctx, GLboolean enable )
+{
+   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   if (enable) {
+      xmesa->pixelformat = xmesa->xm_visual->dithered_pf;
+   }
+   else {
+      xmesa->pixelformat = xmesa->xm_visual->undithered_pf;
+   }
+}
+
+
+
+/**********************************************************************/
+/*** glClear implementations                                        ***/
+/**********************************************************************/
+
+
+static void
+clear_front_pixmap( GLcontext *ctx, GLboolean all,
+                    GLint x, GLint y, GLint width, GLint height )
+{
+   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   if (all) {
+      XMesaFillRectangle( xmesa->display, xmesa->xm_buffer->frontbuffer,
+                          xmesa->xm_buffer->cleargc,
+                          0, 0,
+                          xmesa->xm_buffer->width+1,
+                          xmesa->xm_buffer->height+1 );
+   }
+   else {
+      XMesaFillRectangle( xmesa->display, xmesa->xm_buffer->frontbuffer,
+                          xmesa->xm_buffer->cleargc,
+                          x, xmesa->xm_buffer->height - y - height,
+                          width, height );
+   }
+}
+
+
+static void
+clear_back_pixmap( GLcontext *ctx, GLboolean all,
+                   GLint x, GLint y, GLint width, GLint height )
+{
+   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   if (all) {
+      XMesaFillRectangle( xmesa->display, xmesa->xm_buffer->backpixmap,
+                          xmesa->xm_buffer->cleargc,
+                          0, 0,
+                          xmesa->xm_buffer->width+1,
+                          xmesa->xm_buffer->height+1 );
+   }
+   else {
+      XMesaFillRectangle( xmesa->display, xmesa->xm_buffer->backpixmap,
+                          xmesa->xm_buffer->cleargc,
+                          x, xmesa->xm_buffer->height - y - height,
+                          width, height );
+   }
+}
+
+
+static void
+clear_8bit_ximage( GLcontext *ctx, GLboolean all,
+                   GLint x, GLint y, GLint width, GLint height )
+{
+   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   if (all) {
+      size_t n = xmesa->xm_buffer->backimage->bytes_per_line
+         * xmesa->xm_buffer->backimage->height;
+      MEMSET( xmesa->xm_buffer->backimage->data, xmesa->clearpixel, n );
+   }
+   else {
+      GLint i;
+      for (i=0;i<height;i++) {
+         GLubyte *ptr = PIXELADDR1( xmesa->xm_buffer, x, y+i );
+         MEMSET( ptr, xmesa->clearpixel, width );
+      }
+   }
+}
+
+
+static void
+clear_HPCR_ximage( GLcontext *ctx, GLboolean all,
+                   GLint x, GLint y, GLint width, GLint height )
+{
+   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   if (all) {
+      GLint i, c16 = (xmesa->xm_buffer->backimage->bytes_per_line>>4)<<4;
+      GLubyte *ptr  = (GLubyte *)xmesa->xm_buffer->backimage->data;
+      for (i=0; i<xmesa->xm_buffer->backimage->height; i++) {
+         GLint j;
+         GLubyte *sptr = xmesa->xm_visual->hpcr_clear_ximage_pattern[0];
+         if (i&1) {
+            sptr += 16;
+         }
+         for (j=0; j<c16; j+=16) {
+            ptr[0] = sptr[0];
+            ptr[1] = sptr[1];
+            ptr[2] = sptr[2];
+            ptr[3] = sptr[3];
+            ptr[4] = sptr[4];
+            ptr[5] = sptr[5];
+            ptr[6] = sptr[6];
+            ptr[7] = sptr[7];
+            ptr[8] = sptr[8];
+            ptr[9] = sptr[9];
+            ptr[10] = sptr[10];
+            ptr[11] = sptr[11];
+            ptr[12] = sptr[12];
+            ptr[13] = sptr[13];
+            ptr[14] = sptr[14];
+            ptr[15] = sptr[15];
+            ptr += 16;
+         }
+         for (; j<xmesa->xm_buffer->backimage->bytes_per_line; j++) {
+            *ptr = sptr[j&15];
+            ptr++;
+         }
+      }
+   }
+   else {
+      GLint i;
+      for (i=y; i<y+height; i++) {
+         GLubyte *ptr = PIXELADDR1( xmesa->xm_buffer, x, i );
+         int j;
+         GLubyte *sptr = xmesa->xm_visual->hpcr_clear_ximage_pattern[0];
+         if (i&1) {
+            sptr += 16;
+         }
+         for (j=x; j<x+width; j++) {
+            *ptr = sptr[j&15];
+            ptr++;
+         }
+      }
+   }
+}
+
+
+static void
+clear_16bit_ximage( GLcontext *ctx, GLboolean all,
+                    GLint x, GLint y, GLint width, GLint height )
+{
+   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   register GLuint pixel = (GLuint) xmesa->clearpixel;
+   if (xmesa->swapbytes) {
+      pixel = ((pixel >> 8) & 0x00ff) | ((pixel << 8) & 0xff00);
+   }
+   if (all) {
+      register GLuint n;
+      register GLuint *ptr4 = (GLuint *) xmesa->xm_buffer->backimage->data;
+      if ((pixel & 0xff) == ((pixel >> 8) & 0xff)) {
+         /* low and high bytes are equal so use memset() */
+         n = xmesa->xm_buffer->backimage->bytes_per_line
+            * xmesa->xm_buffer->height;
+         MEMSET( ptr4, pixel & 0xff, n );
+      }
+      else {
+         pixel = pixel | (pixel<<16);
+         n = xmesa->xm_buffer->backimage->bytes_per_line 
+            * xmesa->xm_buffer->height / 4;
+         do {
+            *ptr4++ = pixel;
+               n--;
+         } while (n!=0);
+         
+         if ((xmesa->xm_buffer->backimage->bytes_per_line * 
+              xmesa->xm_buffer->height) & 0x2)
+            *(GLushort *)ptr4 = pixel & 0xffff;
+      }
+   }
+   else {
+      register int i, j;
+      for (j=0;j<height;j++) {
+         register GLushort *ptr2 = PIXELADDR2( xmesa->xm_buffer, x, y+j );
+         for (i=0;i<width;i++) {
+            *ptr2++ = pixel;
+         }
+      }
+   }
+}
+
+
+/* Optimized code provided by Nozomi Ytow <[email protected]> */
+static void
+clear_24bit_ximage( GLcontext *ctx, GLboolean all,
+                    GLint x, GLint y, GLint width, GLint height )
+{
+   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const GLubyte r = xmesa->clearcolor[0];
+   const GLubyte g = xmesa->clearcolor[1];
+   const GLubyte b = xmesa->clearcolor[2];
+   register GLuint clearPixel;
+   if (xmesa->swapbytes) {
+      clearPixel = (b << 16) | (g << 8) | r;
+   }
+   else {
+      clearPixel = (r << 16) | (g << 8) | b;
+   }
+
+   if (all) {
+      if (r==g && g==b) {
+         /* same value for all three components (gray) */
+         const GLint w3 = xmesa->xm_buffer->width * 3;
+         const GLint h = xmesa->xm_buffer->height;
+         GLint i;
+         for (i = 0; i < h; i++) {
+            bgr_t *ptr3 = PIXELADDR3(xmesa->xm_buffer, 0, i);
+            MEMSET(ptr3, r, w3);
+         }
+      }
+      else {
+         /* the usual case */
+         const GLint w = xmesa->xm_buffer->width;
+         const GLint h = xmesa->xm_buffer->height;
+         GLint i, j;
+         for (i = 0; i < h; i++) {
+            bgr_t *ptr3 = PIXELADDR3(xmesa->xm_buffer, 0, i);
+            for (j = 0; j < w; j++) {
+               ptr3->r = r;
+               ptr3->g = g;
+               ptr3->b = b;
+               ptr3++;
+            }
+         }
+#if 0 /* this code doesn't work for all window widths */
+         register GLuint *ptr4 = (GLuint *) ptr3;
+         register GLuint px;
+         GLuint pixel4[3];
+         register GLuint *p = pixel4;
+         pixel4[0] = clearPixel | (clearPixel << 24);
+         pixel4[1] = (clearPixel << 16) | (clearPixel >> 8);
+         pixel4[2] = (clearPixel << 8) | (clearPixel >>  16);
+         switch (3 & (int)(ptr3 - (bgr_t*) ptr4)){
+            case 0:
+               break;
+            case 1:
+               px = *ptr4 & 0x00ffffff;
+               px |= pixel4[0] & 0xff000000;
+               *ptr4++ = px;
+               px = *ptr4 & 0xffff0000;
+               px |= pixel4[2] & 0x0000ffff;
+               *ptr4 = px;
+               if (0 == --n)
+                  break;
+            case 2:
+               px = *ptr4 & 0x0000fffff;
+               px |= pixel4[1] & 0xffff0000;
+               *ptr4++ = px;
+               px = *ptr4 & 0xffffff00;
+               px |= pixel4[2] & 0x000000ff;
+               *ptr4 = px;
+               if (0 == --n)
+                  break;
+            case 3:
+               px = *ptr4 & 0x000000ff;
+               px |= pixel4[2] & 0xffffff00;
+               *ptr4++ = px;
+               --n;
+               break;
+         }
+         while (n > 3) {
+            p = pixel4;
+            *ptr4++ = *p++;
+            *ptr4++ = *p++;
+            *ptr4++ = *p++;
+            n -= 4;
+         }
+         switch (n) {
+            case 3:
+               p = pixel4;
+               *ptr4++ = *p++;
+               *ptr4++ = *p++;
+               px = *ptr4 & 0xffffff00;
+               px |= clearPixel & 0xff;
+               *ptr4 = px;
+               break;
+            case 2:
+               p = pixel4;
+               *ptr4++ = *p++;
+               px = *ptr4 & 0xffff0000;
+               px |= *p & 0xffff;
+               *ptr4 = px;
+               break;
+            case 1:
+               px = *ptr4 & 0xff000000;
+               px |= *p & 0xffffff;
+               *ptr4 = px;
+               break;
+            case 0:
+               break;
+         }
+#endif
+      }
+   }
+   else {
+      /* only clear subrect of color buffer */
+      if (r==g && g==b) {
+         /* same value for all three components (gray) */
+         GLint j;
+         for (j=0;j<height;j++) {
+            bgr_t *ptr3 = PIXELADDR3( xmesa->xm_buffer, x, y+j );
+            MEMSET(ptr3, r, 3 * width);
+         }
+      }
+      else {
+         /* non-gray clear color */
+         GLint i, j;
+         for (j = 0; j < height; j++) {
+            bgr_t *ptr3 = PIXELADDR3( xmesa->xm_buffer, x, y+j );
+            for (i = 0; i < width; i++) {
+               ptr3->r = r;
+               ptr3->g = g;
+               ptr3->b = b;
+               ptr3++;
+            }
+         }
+#if 0 /* this code might not always (seems ptr3 always == ptr4) */
+         GLint j;
+         GLuint pixel4[3];
+         pixel4[0] = clearPixel | (clearPixel << 24);
+         pixel4[1] = (clearPixel << 16) | (clearPixel >> 8);
+         pixel4[2] = (clearPixel << 8) | (clearPixel >>  16);
+         for (j=0;j<height;j++) {
+            bgr_t *ptr3 = PIXELADDR3( xmesa->xm_buffer, x, y+j );
+            register GLuint *ptr4 = (GLuint *)ptr3;
+            register GLuint *p, px;
+            GLuint w = width;
+            switch (3 & (int)(ptr3 - (bgr_t*) ptr4)){
+               case 0:
+                  break;
+               case 1:
+                  px = *ptr4 & 0x00ffffff;
+                  px |= pixel4[0] & 0xff000000;
+                  *ptr4++ = px;
+                  px = *ptr4 & 0xffff0000;
+                  px |= pixel4[2] & 0x0000ffff;
+                  *ptr4 = px;
+                  if (0 == --w)
+                     break;
+               case 2:
+                  px = *ptr4 & 0x0000fffff;
+                  px |= pixel4[1] & 0xffff0000;
+                  *ptr4++ = px;
+                  px = *ptr4 & 0xffffff00;
+                  px |= pixel4[2] & 0x000000ff;
+                  *ptr4 = px;
+                  if (0 == --w)
+                     break;
+               case 3:
+                  px = *ptr4 & 0x000000ff;
+                  px |= pixel4[2] & 0xffffff00;
+                  *ptr4++ = px;
+                  --w;
+                  break;
+            }
+            while (w > 3){
+               p = pixel4;
+               *ptr4++ = *p++;
+               *ptr4++ = *p++;
+               *ptr4++ = *p++;
+               w -= 4;
+            }
+            switch (w) {
+               case 3:
+                  p = pixel4;
+                  *ptr4++ = *p++;
+                  *ptr4++ = *p++;
+                  px = *ptr4 & 0xffffff00;
+                  px |= *p & 0xff;
+                  *ptr4 = px;
+                  break;
+               case 2:
+                  p = pixel4;
+                  *ptr4++ = *p++;
+                  px = *ptr4 & 0xffff0000;
+                  px |= *p & 0xffff;
+                  *ptr4 = px;
+                  break;
+               case 1:
+                  px = *ptr4 & 0xff000000;
+                  px |= pixel4[0] & 0xffffff;
+                  *ptr4 = px;
+                  break;
+               case 0:
+                  break;
+            }
+         }
+#endif
+      }
+   }
+}
+
+
+static void
+clear_32bit_ximage( GLcontext *ctx, GLboolean all,
+                    GLint x, GLint y, GLint width, GLint height )
+{
+   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   if (all) {
+      register GLint n = xmesa->xm_buffer->width * xmesa->xm_buffer->height;
+      register GLuint *ptr4 = (GLuint *) xmesa->xm_buffer->backimage->data;
+      register GLuint pixel = (GLuint) xmesa->clearpixel;
+      if (xmesa->swapbytes) {
+         pixel = ((pixel >> 24) & 0x000000ff)
+            | ((pixel >> 8)  & 0x0000ff00)
+            | ((pixel << 8)  & 0x00ff0000)
+            | ((pixel << 24) & 0xff000000);
+      }
+      if (pixel==0) {
+         MEMSET( ptr4, pixel, 4*n );
+      }
+      else {
+         do {
+            *ptr4++ = pixel;
+            n--;
+         } while (n!=0);
+      }
+   }
+   else {
+      register int i, j;
+      register GLuint pixel = (GLuint) xmesa->clearpixel;
+      for (j=0;j<height;j++) {
+         register GLuint *ptr4 = PIXELADDR4( xmesa->xm_buffer, x, y+j );
+         for (i=0;i<width;i++) {
+            *ptr4++ = pixel;
+         }
+      }
+   }
+}
+
+
+static void
+clear_nbit_ximage( GLcontext *ctx, GLboolean all,
+                   GLint x, GLint y, GLint width, GLint height )
+{
+   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   XMesaImage *img = xmesa->xm_buffer->backimage;
+   if (all) {
+      register int i, j;
+      width = xmesa->xm_buffer->width;
+      height = xmesa->xm_buffer->height;
+      for (j=0;j<height;j++) {
+         for (i=0;i<width;i++) {
+            XMesaPutPixel( img, i, j, xmesa->clearpixel );
+         }
+      }
+   }
+   else {
+      /* TODO: optimize this */
+      register int i, j;
+      y = FLIP(xmesa->xm_buffer, y);
+      for (j=0;j<height;j++) {
+         for (i=0;i<width;i++) {
+            XMesaPutPixel( img, x+i, y-j, xmesa->clearpixel );
+         }
+      }
+   }
+}
+
+
+
+static GLbitfield
+clear_buffers( GLcontext *ctx, GLbitfield mask,
+               GLboolean all, GLint x, GLint y, GLint width, GLint height )
+{
+   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   const GLuint *colorMask = (GLuint *) &ctx->Color.ColorMask;
+
+   /* we can't handle color or index masking */
+   if (mask & (DD_FRONT_LEFT_BIT | DD_BACK_LEFT_BIT)) {
+      if (*colorMask != 0xffffffff || ctx->Color.IndexMask != 0xffffffff)
+         return mask;
+   }
+
+   if (mask & DD_FRONT_LEFT_BIT) {
+      ASSERT(xmesa->xm_buffer->front_clear_func);
+      (*xmesa->xm_buffer->front_clear_func)( ctx, all, x, y, width, height );
+   }
+   if (mask & DD_BACK_LEFT_BIT) {
+      ASSERT(xmesa->xm_buffer->back_clear_func);
+      (*xmesa->xm_buffer->back_clear_func)( ctx, all, x, y, width, height );
+   }
+   return mask & (~(DD_FRONT_LEFT_BIT | DD_BACK_LEFT_BIT));
+}
+
+
+
+#ifndef XFree86Server
+/*
+ * This function implements glDrawPixels() with an XPutImage call when
+ * drawing to the front buffer (X Window drawable).
+ * The image format must be GL_BGRA to match the PF_8R8G8B pixel format.
+ * XXX top/bottom edge clipping is broken!
+ */
+static GLboolean
+drawpixels_8R8G8B( GLcontext *ctx,
+                   GLint x, GLint y, GLsizei width, GLsizei height,
+                   GLenum format, GLenum type,
+                   const struct gl_pixelstore_attrib *unpack,
+                   const GLvoid *pixels )
+{
+   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   XMesaDisplay *dpy = xmesa->xm_visual->display;
+   XMesaDrawable buffer = xmesa->xm_buffer->buffer;
+   XMesaGC gc = xmesa->xm_buffer->gc1;
+   assert(dpy);
+   assert(buffer);
+   assert(gc);
+
+   /* XXX also check for pixel scale/bias/lookup/zooming! */
+   if (format == GL_BGRA && type == GL_UNSIGNED_BYTE) {
+      int dstX = x;
+      int dstY = y;
+      int w = width;
+      int h = height;
+      int srcX = unpack->SkipPixels;
+      int srcY = unpack->SkipRows;
+      if (_mesa_clip_pixelrect(ctx, &dstX, &dstY, &w, &h, &srcX, &srcY)) {
+         XMesaImage ximage;
+         MEMSET(&ximage, 0, sizeof(XMesaImage));
+         ximage.width = width;
+         ximage.height = height;
+         ximage.format = ZPixmap;
+         ximage.data = (char *) pixels + (height - 1) * width * 4;
+         ximage.byte_order = LSBFirst;
+         ximage.bitmap_unit = 32;
+         ximage.bitmap_bit_order = LSBFirst;
+         ximage.bitmap_pad = 32;
+         ximage.depth = 24;
+         ximage.bytes_per_line = -width * 4;
+         ximage.bits_per_pixel = 32;
+         ximage.red_mask   = 0xff0000;
+         ximage.green_mask = 0x00ff00;
+         ximage.blue_mask  = 0x0000ff;
+         dstY = FLIP(xmesa->xm_buffer,dstY) - height + 1;
+         XPutImage(dpy, buffer, gc, &ximage, srcX, srcY, dstX, dstY, w, h);
+         return GL_TRUE;
+      }
+   }
+   return GL_FALSE;
+}
+#endif
+
+
+
+static const GLubyte *
+get_string( GLcontext *ctx, GLenum name )
+{
+   (void) ctx;
+   switch (name) {
+      case GL_RENDERER:
+#ifdef XFree86Server
+         return (const GLubyte *) "Mesa GLX Indirect";
+#else
+         return (const GLubyte *) "Mesa X11";
+#endif
+      case GL_VENDOR:
+#ifdef XFree86Server
+         return (const GLubyte *) "VA Linux Systems, Inc.";
+#else
+         return NULL;
+#endif
+      default:
+         return NULL;
+   }
+}
+
+
+/*
+ * Initialize all the DD.* function pointers depending on the color
+ * buffer configuration.  This is mainly called by XMesaMakeCurrent.
+ */
+void
+xmesa_update_state( GLcontext *ctx )
+{
+   XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   /*int depth=GET_VISUAL_DEPTH(xmesa->xm_visual);*/
+
+   (void) DitherValues;  /* silenced unused var warning */
+#ifndef XFree86Server
+   (void) drawpixels_8R8G8B;
+#endif
+
+   /*
+    * Always the same:
+    */
+   ctx->Driver.GetString = get_string;
+   ctx->Driver.UpdateState = xmesa_update_state;
+   ctx->Driver.GetBufferSize = get_buffer_size;
+   ctx->Driver.Flush = flush;
+   ctx->Driver.Finish = finish;
+   
+   ctx->Driver.RenderStart = 0;
+   ctx->Driver.RenderFinish = 0;
+
+   ctx->Driver.SetDrawBuffer = set_draw_buffer;
+   ctx->Driver.SetReadBuffer = set_read_buffer;
+
+   ctx->Driver.Index = set_index;
+   ctx->Driver.Color = set_color;
+   ctx->Driver.ClearIndex = clear_index;
+   ctx->Driver.ClearColor = clear_color;
+   ctx->Driver.Clear = clear_buffers;
+   ctx->Driver.IndexMask = index_mask;
+   ctx->Driver.ColorMask = color_mask;
+   ctx->Driver.Dither = dither;
+
+   ctx->Driver.PointsFunc = xmesa_get_points_func( ctx );
+   ctx->Driver.LineFunc = xmesa_get_line_func( ctx );
+   ctx->Driver.TriangleFunc = xmesa_get_triangle_func( ctx );
+
+/*     ctx->Driver.TriangleCaps = DD_TRI_CULL; */
+
+   /* setup pointers to front and back buffer clear functions */
+   /* XXX this bit of code could be moved to a one-time init */
+   xmesa->xm_buffer->front_clear_func = clear_front_pixmap;
+   if (xmesa->xm_buffer->backpixmap != XIMAGE) {
+      /* back buffer is a pixmap */
+      xmesa->xm_buffer->back_clear_func = clear_back_pixmap;
+   }
+   else if (sizeof(GLushort)!=2 || sizeof(GLuint)!=4) {
+      /* Do this on Crays */
+      xmesa->xm_buffer->back_clear_func = clear_nbit_ximage;
+   }
+   else {
+      /* Do this on most machines */
+      switch (xmesa->xm_visual->BitsPerPixel) {
+         case 8:
+	    if (xmesa->xm_visual->hpcr_clear_flag) {
+               xmesa->xm_buffer->back_clear_func = clear_HPCR_ximage;
+            }
+            else {
+               xmesa->xm_buffer->back_clear_func = clear_8bit_ximage;
+            }
+            break;
+         case 16:
+            xmesa->xm_buffer->back_clear_func = clear_16bit_ximage;
+            break;
+         case 24:
+            xmesa->xm_buffer->back_clear_func = clear_24bit_ximage;
+            break;
+         case 32:
+            xmesa->xm_buffer->back_clear_func = clear_32bit_ximage;
+            break;
+         default:
+            xmesa->xm_buffer->back_clear_func = clear_nbit_ximage;
+            break;
+      }
+   }
+
+   xmesa_update_span_funcs(ctx);
+}