Initial import.

1 files changed, 1220 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 0000000..ebd75cd
--- /dev/null
+++ b/src/mesa/drivers/x11/xm_dd.c
@@ -0,0 +1,1220 @@
+/*
+ * Mesa 3-D graphics library
+ * Version:  6.1
+ *
+ * Copyright (C) 1999-2004  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 "bufferobj.h"
+#include "context.h"
+#include "colormac.h"
+#include "depth.h"
+#include "drawpix.h"
+#include "extensions.h"
+#include "macros.h"
+#include "imports.h"
+#include "mtypes.h"
+#include "state.h"
+#include "texobj.h"
+#include "teximage.h"
+#include "texstore.h"
+#include "texformat.h"
+#include "xmesaP.h"
+#include "array_cache/acache.h"
+#include "swrast/swrast.h"
+#include "swrast/s_auxbuffer.h"
+#include "swrast/s_context.h"
+#include "swrast/s_drawpix.h"
+#include "swrast/s_alphabuf.h"
+#include "swrast_setup/swrast_setup.h"
+#include "tnl/tnl.h"
+#include "tnl/t_context.h"
+
+#ifdef XFree86Server
+#include <GL/glxtokens.h>
+#endif
+
+
+
+/*
+ * Dithering kernels and lookup tables.
+ */
+
+const int xmesa_kernel8[DITH_DY * DITH_DX] = {
+    0 * MAXC,  8 * MAXC,  2 * MAXC, 10 * MAXC,
+   12 * MAXC,  4 * MAXC, 14 * MAXC,  6 * MAXC,
+    3 * MAXC, 11 * MAXC,  1 * MAXC,  9 * MAXC,
+   15 * MAXC,  7 * MAXC, 13 * MAXC,  5 * MAXC,
+};
+
+const short xmesa_HPCR_DRGB[3][2][16] = {
+   {
+      { 16, -4,  1,-11, 14, -6,  3, -9, 15, -5,  2,-10, 13, -7,  4, -8},
+      {-15,  5,  0, 12,-13,  7, -2, 10,-14,  6, -1, 11,-12,  8, -3,  9}
+   },
+   {
+      {-11, 15, -7,  3, -8, 14, -4,  2,-10, 16, -6,  4, -9, 13, -5,  1},
+      { 12,-14,  8, -2,  9,-13,  5, -1, 11,-15,  7, -3, 10,-12,  6,  0}
+   },
+   {
+      {  6,-18, 26,-14,  2,-22, 30,-10,  8,-16, 28,-12,  4,-20, 32, -8},
+      { -4, 20,-24, 16,  0, 24,-28, 12, -6, 18,-26, 14, -2, 22,-30, 10}
+   }
+};
+
+const int xmesa_kernel1[16] = {
+   0*47,  9*47,  4*47, 12*47,     /* 47 = (255*3)/16 */
+   6*47,  2*47, 14*47,  8*47,
+  10*47,  1*47,  5*47, 11*47,
+   7*47, 13*47,  3*47, 15*47
+};
+
+
+/*
+ * Return the size (width, height) of the X window for the given GLframebuffer.
+ * Output:  width - width of buffer in pixels.
+ *          height - height of buffer in pixels.
+ */
+static void
+get_buffer_size( GLframebuffer *buffer, GLuint *width, GLuint *height )
+{
+   /* We can do this cast because the first field in the XMesaBuffer
+    * struct is a GLframebuffer struct.  If this weren't true, we'd
+    * need a pointer from the GLframebuffer to the XMesaBuffer.
+    */
+   const XMesaBuffer xmBuffer = (XMesaBuffer) buffer;
+   unsigned int winwidth, winheight;
+#ifdef XFree86Server
+   /* XFree86 GLX renderer */
+   winwidth = MIN2(xmBuffer->frontbuffer->width, MAX_WIDTH);
+   winheight = MIN2(xmBuffer->frontbuffer->height, MAX_HEIGHT);
+#else
+   Window root;
+   int winx, winy;
+   unsigned int bw, d;
+
+   _glthread_LOCK_MUTEX(_xmesa_lock);
+   XSync(xmBuffer->xm_visual->display, 0); /* added for Chromium */
+   XGetGeometry( xmBuffer->xm_visual->display, xmBuffer->frontbuffer, &root,
+		 &winx, &winy, &winwidth, &winheight, &bw, &d );
+   _glthread_UNLOCK_MUTEX(_xmesa_lock);
+#endif
+
+   *width = winwidth;
+   *height = winheight;
+}
+
+
+static void
+finish_or_flush( GLcontext *ctx )
+{
+#ifdef XFree86Server
+      /* NOT_NEEDED */
+#else
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   if (xmesa) {
+      _glthread_LOCK_MUTEX(_xmesa_lock);
+      XSync( xmesa->display, False );
+      _glthread_UNLOCK_MUTEX(_xmesa_lock);
+   }
+#endif
+}
+
+
+
+/*
+ * This chooses the color buffer for reading and writing spans, points,
+ * lines, and triangles.
+ */
+void
+xmesa_set_buffer( GLcontext *ctx, GLframebuffer *buffer, GLuint bufferBit )
+{
+   /* We can make this cast since the XMesaBuffer wraps GLframebuffer.
+    * GLframebuffer is the first member in a XMesaBuffer struct.
+    */
+   XMesaBuffer target = (XMesaBuffer) buffer;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+
+   /* This assignment tells the span/point/line/triangle functions
+    * which XMesaBuffer to use.
+    */
+   xmesa->xm_buffer = target;
+
+   /*
+    * Now determine front vs back color buffer.
+    */
+   if (bufferBit == DD_FRONT_LEFT_BIT) {
+      target->buffer = target->frontbuffer;
+      xmesa_update_span_funcs(ctx);
+   }
+   else if (bufferBit == DD_BACK_LEFT_BIT) {
+      ASSERT(target->db_state);
+      if (target->backpixmap) {
+         /* back buffer is a pixmap */
+         target->buffer = (XMesaDrawable) target->backpixmap;
+      }
+      else if (target->backimage) {
+         /* back buffer is an XImage */
+         target->buffer = None;
+      }
+      else {
+         /* No back buffer!!!!  Must be out of memory, use front buffer */
+         target->buffer = target->frontbuffer;
+      }
+      xmesa_update_span_funcs(ctx);
+   }
+   else if (bufferBit & (DD_AUX0_BIT | DD_AUX1_BIT | DD_AUX2_BIT | DD_AUX3_BIT)) {
+      _swrast_use_aux_buffer(ctx, buffer, bufferBit);
+   } 
+   else {
+      _mesa_problem(ctx, "invalid buffer 0x%x in set_buffer() in xm_dd.c");
+      return;
+   }
+}
+
+
+
+static void
+clear_index( GLcontext *ctx, GLuint index )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   xmesa->clearpixel = (unsigned long) index;
+   XMesaSetForeground( xmesa->display, xmesa->xm_draw_buffer->cleargc,
+                       (unsigned long) index );
+}
+
+
+static void
+clear_color( GLcontext *ctx, const GLfloat color[4] )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   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]);
+   xmesa->clearpixel = xmesa_color_to_pixel( xmesa,
+                                             xmesa->clearcolor[0],
+                                             xmesa->clearcolor[1],
+                                             xmesa->clearcolor[2],
+                                             xmesa->clearcolor[3],
+                                             xmesa->xm_visual->undithered_pf );
+   _glthread_LOCK_MUTEX(_xmesa_lock);
+   XMesaSetForeground( xmesa->display, xmesa->xm_draw_buffer->cleargc,
+                       xmesa->clearpixel );
+   _glthread_UNLOCK_MUTEX(_xmesa_lock);
+}
+
+
+
+/* Set index mask ala glIndexMask */
+static void
+index_mask( GLcontext *ctx, GLuint mask )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   if (xmesa->xm_draw_buffer->buffer != XIMAGE) {
+      unsigned long m;
+      if (mask==0xffffffff) {
+	 m = ((unsigned long)~0L);
+      }
+      else {
+         m = (unsigned long) mask;
+      }
+      XMesaSetPlaneMask( xmesa->display, xmesa->xm_draw_buffer->cleargc, m );
+      XMesaSetPlaneMask( xmesa->display, xmesa->xm_draw_buffer->gc, m );
+   }
+}
+
+
+/* Implements glColorMask() */
+static void
+color_mask(GLcontext *ctx,
+           GLboolean rmask, GLboolean gmask, GLboolean bmask, GLboolean amask)
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   const int xclass = xmesa->xm_visual->mesa_visual.visualType;
+   (void) amask;
+
+   if (xclass == GLX_TRUE_COLOR || xclass == GLX_DIRECT_COLOR) {
+      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_draw_buffer->cleargc, m );
+      XMesaSetPlaneMask( xmesa->display, xmesa->xm_draw_buffer->gc, m );
+   }
+}
+
+
+
+/**********************************************************************/
+/*** glClear implementations                                        ***/
+/**********************************************************************/
+
+
+static void
+clear_front_pixmap( GLcontext *ctx, GLboolean all,
+                    GLint x, GLint y, GLint width, GLint height )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   if (all) {
+      XMesaFillRectangle( xmesa->display, xmesa->xm_draw_buffer->frontbuffer,
+                          xmesa->xm_draw_buffer->cleargc,
+                          0, 0,
+                          xmesa->xm_draw_buffer->width+1,
+                          xmesa->xm_draw_buffer->height+1 );
+   }
+   else {
+      XMesaFillRectangle( xmesa->display, xmesa->xm_draw_buffer->frontbuffer,
+                          xmesa->xm_draw_buffer->cleargc,
+                          x, xmesa->xm_draw_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 = XMESA_CONTEXT(ctx);
+   if (all) {
+      XMesaFillRectangle( xmesa->display, xmesa->xm_draw_buffer->backpixmap,
+                          xmesa->xm_draw_buffer->cleargc,
+                          0, 0,
+                          xmesa->xm_draw_buffer->width+1,
+                          xmesa->xm_draw_buffer->height+1 );
+   }
+   else {
+      XMesaFillRectangle( xmesa->display, xmesa->xm_draw_buffer->backpixmap,
+                          xmesa->xm_draw_buffer->cleargc,
+                          x, xmesa->xm_draw_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 = XMESA_CONTEXT(ctx);
+   if (all) {
+      size_t n = xmesa->xm_draw_buffer->backimage->bytes_per_line
+         * xmesa->xm_draw_buffer->backimage->height;
+      MEMSET( xmesa->xm_draw_buffer->backimage->data, xmesa->clearpixel, n );
+   }
+   else {
+      GLint i;
+      for (i=0;i<height;i++) {
+         GLubyte *ptr = PIXELADDR1( xmesa->xm_draw_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 = XMESA_CONTEXT(ctx);
+   if (all) {
+      GLint i, c16 = (xmesa->xm_draw_buffer->backimage->bytes_per_line>>4)<<4;
+      GLubyte *ptr  = (GLubyte *)xmesa->xm_draw_buffer->backimage->data;
+      for (i=0; i<xmesa->xm_draw_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_draw_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_draw_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 = XMESA_CONTEXT(ctx);
+   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_draw_buffer->backimage->data;
+      if ((pixel & 0xff) == ((pixel >> 8) & 0xff)) {
+         /* low and high bytes are equal so use memset() */
+         n = xmesa->xm_draw_buffer->backimage->bytes_per_line
+            * xmesa->xm_draw_buffer->height;
+         MEMSET( ptr4, pixel & 0xff, n );
+      }
+      else {
+         pixel = pixel | (pixel<<16);
+         n = xmesa->xm_draw_buffer->backimage->bytes_per_line
+            * xmesa->xm_draw_buffer->height / 4;
+         do {
+            *ptr4++ = pixel;
+               n--;
+         } while (n!=0);
+
+         if ((xmesa->xm_draw_buffer->backimage->bytes_per_line *
+              xmesa->xm_draw_buffer->height) & 0x2)
+            *(GLushort *)ptr4 = pixel & 0xffff;
+      }
+   }
+   else {
+      register int i, j;
+      for (j=0;j<height;j++) {
+         register GLushort *ptr2 = PIXELADDR2( xmesa->xm_draw_buffer, x, y+j );
+         for (i=0;i<width;i++) {
+            *ptr2++ = pixel;
+         }
+      }
+   }
+}
+
+
+/* Optimized code provided by Nozomi Ytow <noz@xfree86.org> */
+static void
+clear_24bit_ximage( GLcontext *ctx, GLboolean all,
+                    GLint x, GLint y, GLint width, GLint height )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   const GLubyte r = xmesa->clearcolor[0];
+   const GLubyte g = xmesa->clearcolor[1];
+   const GLubyte b = xmesa->clearcolor[2];
+#if 0	/* See below */
+   register GLuint clearPixel;
+   if (xmesa->swapbytes) {
+      clearPixel = (b << 16) | (g << 8) | r;
+   }
+   else {
+      clearPixel = (r << 16) | (g << 8) | b;
+   }
+#endif
+
+   if (all) {
+      if (r==g && g==b) {
+         /* same value for all three components (gray) */
+         const GLint w3 = xmesa->xm_draw_buffer->width * 3;
+         const GLint h = xmesa->xm_draw_buffer->height;
+         GLint i;
+         for (i = 0; i < h; i++) {
+            bgr_t *ptr3 = PIXELADDR3(xmesa->xm_draw_buffer, 0, i);
+            MEMSET(ptr3, r, w3);
+         }
+      }
+      else {
+         /* the usual case */
+         const GLint w = xmesa->xm_draw_buffer->width;
+         const GLint h = xmesa->xm_draw_buffer->height;
+         GLint i, j;
+         for (i = 0; i < h; i++) {
+            bgr_t *ptr3 = PIXELADDR3(xmesa->xm_draw_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_draw_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_draw_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_draw_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 = XMESA_CONTEXT(ctx);
+   register GLuint pixel = (GLuint) xmesa->clearpixel;
+   if (xmesa->swapbytes) {
+      pixel = ((pixel >> 24) & 0x000000ff)
+            | ((pixel >> 8)  & 0x0000ff00)
+            | ((pixel << 8)  & 0x00ff0000)
+            | ((pixel << 24) & 0xff000000);
+   }
+   if (all) {
+      register GLint n = xmesa->xm_draw_buffer->width * xmesa->xm_draw_buffer->height;
+      register GLuint *ptr4 = (GLuint *) xmesa->xm_draw_buffer->backimage->data;
+      if (pixel==0) {
+         MEMSET( ptr4, pixel, 4*n );
+      }
+      else {
+         do {
+            *ptr4++ = pixel;
+            n--;
+         } while (n!=0);
+      }
+   }
+   else {
+      register int i, j;
+      for (j=0;j<height;j++) {
+         register GLuint *ptr4 = PIXELADDR4( xmesa->xm_draw_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 = XMESA_CONTEXT(ctx);
+   XMesaImage *img = xmesa->xm_draw_buffer->backimage;
+   if (all) {
+      register int i, j;
+      width = xmesa->xm_draw_buffer->width;
+      height = xmesa->xm_draw_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_draw_buffer, y);
+      for (j=0;j<height;j++) {
+         for (i=0;i<width;i++) {
+            XMesaPutPixel( img, x+i, y-j, xmesa->clearpixel );
+         }
+      }
+   }
+}
+
+
+
+static void
+clear_buffers( GLcontext *ctx, GLbitfield mask,
+               GLboolean all, GLint x, GLint y, GLint width, GLint height )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   const GLuint *colorMask = (GLuint *) &ctx->Color.ColorMask;
+
+   if ((mask & (DD_FRONT_LEFT_BIT | DD_BACK_LEFT_BIT)) &&
+       xmesa->xm_draw_buffer->mesa_buffer.UseSoftwareAlphaBuffers &&
+       ctx->Color.ColorMask[ACOMP]) {
+      _swrast_clear_alpha_buffers(ctx);
+   }
+
+   /* we can't handle color or index masking */
+   if (*colorMask == 0xffffffff && ctx->Color.IndexMask == 0xffffffff) {
+      if (mask & DD_FRONT_LEFT_BIT) {
+	 ASSERT(xmesa->xm_draw_buffer->front_clear_func);
+	 (*xmesa->xm_draw_buffer->front_clear_func)( ctx, all, x, y, width, height );
+	 mask &= ~DD_FRONT_LEFT_BIT;
+      }
+      if (mask & DD_BACK_LEFT_BIT) {
+	 ASSERT(xmesa->xm_draw_buffer->back_clear_func);
+	 (*xmesa->xm_draw_buffer->back_clear_func)( ctx, all, x, y, width, height );
+	 mask &= ~DD_BACK_LEFT_BIT;
+      }
+   }
+
+   if (mask)
+      _swrast_Clear( ctx, mask, all, x, y, width, height );
+}
+
+
+/*
+ * When we detect that the user has resized the window this function will
+ * get called.  Here we'll reallocate the back buffer, depth buffer,
+ * stencil buffer etc. to match the new window size.
+ */
+void
+xmesa_resize_buffers( GLframebuffer *buffer )
+{
+   int height = (int) buffer->Height;
+   /* We can do this cast because the first field in the XMesaBuffer
+    * struct is a GLframebuffer struct.  If this weren't true, we'd
+    * need a pointer from the GLframebuffer to the XMesaBuffer.
+    */
+   XMesaBuffer xmBuffer = (XMesaBuffer) buffer;
+
+   xmBuffer->width = buffer->Width;
+   xmBuffer->height = buffer->Height;
+   xmesa_alloc_back_buffer( xmBuffer );
+
+   /* Needed by FLIP macro */
+   xmBuffer->bottom = height - 1;
+
+   if (xmBuffer->backimage) {
+      /* Needed by PIXELADDR1 macro */
+      xmBuffer->ximage_width1 = xmBuffer->backimage->bytes_per_line;
+      xmBuffer->ximage_origin1 = (GLubyte *) xmBuffer->backimage->data
+         + xmBuffer->ximage_width1 * (height-1);
+
+      /* Needed by PIXELADDR2 macro */
+      xmBuffer->ximage_width2 = xmBuffer->backimage->bytes_per_line / 2;
+      xmBuffer->ximage_origin2 = (GLushort *) xmBuffer->backimage->data
+         + xmBuffer->ximage_width2 * (height-1);
+
+      /* Needed by PIXELADDR3 macro */
+      xmBuffer->ximage_width3 = xmBuffer->backimage->bytes_per_line;
+      xmBuffer->ximage_origin3 = (GLubyte *) xmBuffer->backimage->data
+         + xmBuffer->ximage_width3 * (height-1);
+
+      /* Needed by PIXELADDR4 macro */
+      xmBuffer->ximage_width4 = xmBuffer->backimage->width;
+      xmBuffer->ximage_origin4 = (GLuint *) xmBuffer->backimage->data
+         + xmBuffer->ximage_width4 * (height-1);
+   }
+
+   _swrast_alloc_buffers( buffer );
+}
+
+
+#ifndef XFree86Server
+/* XXX this was never tested in the Xserver environment */
+
+/**
+ * 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.
+ */
+static void
+xmesa_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 = XMESA_CONTEXT(ctx);
+   const SWcontext *swrast = SWRAST_CONTEXT( ctx );
+   XMesaDisplay *dpy = xmesa->xm_visual->display;
+   const XMesaDrawable buffer = xmesa->xm_draw_buffer->buffer;
+   const XMesaGC gc = xmesa->xm_draw_buffer->gc;
+
+   ASSERT(dpy);
+   ASSERT(gc);
+   ASSERT(xmesa->xm_visual->dithered_pf == PF_8R8G8B);
+   ASSERT(xmesa->xm_visual->undithered_pf == PF_8R8G8B);
+
+   if (swrast->NewState)
+      _swrast_validate_derived( ctx );
+
+   if (buffer &&   /* buffer != 0 means it's a Window or Pixmap */
+       format == GL_BGRA &&
+       type == GL_UNSIGNED_BYTE &&
+       (swrast->_RasterMask & ~CLIP_BIT) == 0 && /* no blend, z-test, etc */
+       ctx->_ImageTransferState == 0 &&  /* no color tables, scale/bias, etc */
+       ctx->Pixel.ZoomX == 1.0 &&        /* no zooming */
+       ctx->Pixel.ZoomY == 1.0) {
+      int dstX = x;
+      int dstY = y;
+      int w = width;
+      int h = height;
+      int srcX = unpack->SkipPixels;
+      int srcY = unpack->SkipRows;
+      int rowLength = unpack->RowLength ? unpack->RowLength : width;
+
+      pixels = _swrast_validate_pbo_access(unpack, width, height, 1,
+                                           format, type, (GLvoid *) pixels);
+      if (!pixels)
+         return;
+
+      if (_swrast_clip_pixelrect(ctx, &dstX, &dstY, &w, &h, &srcX, &srcY)) {
+         /* This is a little tricky since all coordinates up to now have
+          * been in the OpenGL bottom-to-top orientation.  X is top-to-bottom
+          * so we have to carefully compute the Y coordinates/addresses here.
+          */
+         XMesaImage ximage;
+         MEMSET(&ximage, 0, sizeof(XMesaImage));
+         ximage.width = width;
+         ximage.height = height;
+         ximage.format = ZPixmap;
+         ximage.data = (char *) pixels
+            + ((srcY + h - 1) * rowLength + srcX) * 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 = -rowLength * 4; /* negative to flip image */
+         ximage.bits_per_pixel = 32;
+         /* it seems we don't need to set the ximage.red/green/blue_mask fields */
+         /* flip Y axis for dest position */
+         dstY = FLIP(xmesa->xm_draw_buffer, dstY) - h + 1;
+         XPutImage(dpy, buffer, gc, &ximage, 0, 0, dstX, dstY, w, h);
+      }
+   }
+   else {
+      /* software fallback */
+      _swrast_DrawPixels(ctx, x, y, width, height,
+                         format, type, unpack, pixels);
+   }
+}
+
+
+
+/**
+ * This function implements glDrawPixels() with an XPutImage call when
+ * drawing to the front buffer (X Window drawable).  The image format
+ * must be GL_RGB and image type must be GL_UNSIGNED_SHORT_5_6_5 to
+ * match the PF_5R6G5B pixel format.
+ */
+static void
+xmesa_DrawPixels_5R6G5B( 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 = XMESA_CONTEXT(ctx);
+   const SWcontext *swrast = SWRAST_CONTEXT( ctx );
+   XMesaDisplay *dpy = xmesa->xm_visual->display;
+   const XMesaDrawable buffer = xmesa->xm_draw_buffer->buffer;
+   const XMesaGC gc = xmesa->xm_draw_buffer->gc;
+
+   ASSERT(dpy);
+   ASSERT(gc);
+   ASSERT(xmesa->xm_visual->undithered_pf == PF_5R6G5B);
+
+   if (swrast->NewState)
+      _swrast_validate_derived( ctx );
+
+   if (buffer &&   /* buffer != 0 means it's a Window or Pixmap */
+       format == GL_RGB &&
+       type == GL_UNSIGNED_SHORT_5_6_5 &&
+       !ctx->Color.DitherFlag &&  /* no dithering */
+       (swrast->_RasterMask & ~CLIP_BIT) == 0 && /* no blend, z-test, etc */
+       ctx->_ImageTransferState == 0 &&  /* no color tables, scale/bias, etc */
+       ctx->Pixel.ZoomX == 1.0 &&        /* no zooming */
+       ctx->Pixel.ZoomY == 1.0) {
+      int dstX = x;
+      int dstY = y;
+      int w = width;
+      int h = height;
+      int srcX = unpack->SkipPixels;
+      int srcY = unpack->SkipRows;
+      int rowLength = unpack->RowLength ? unpack->RowLength : width;
+
+      pixels = _swrast_validate_pbo_access(unpack, width, height, 1,
+                                           format, type, (GLvoid *) pixels);
+      if (!pixels)
+         return;
+
+      if (_swrast_clip_pixelrect(ctx, &dstX, &dstY, &w, &h, &srcX, &srcY)) {
+         /* This is a little tricky since all coordinates up to now have
+          * been in the OpenGL bottom-to-top orientation.  X is top-to-bottom
+          * so we have to carefully compute the Y coordinates/addresses here.
+          */
+         XMesaImage ximage;
+         MEMSET(&ximage, 0, sizeof(XMesaImage));
+         ximage.width = width;
+         ximage.height = height;
+         ximage.format = ZPixmap;
+         ximage.data = (char *) pixels
+            + ((srcY + h - 1) * rowLength + srcX) * 2;
+         ximage.byte_order = LSBFirst;
+         ximage.bitmap_unit = 16;
+         ximage.bitmap_bit_order = LSBFirst;
+         ximage.bitmap_pad = 16;
+         ximage.depth = 16;
+         ximage.bytes_per_line = -rowLength * 2; /* negative to flip image */
+         ximage.bits_per_pixel = 16;
+         /* it seems we don't need to set the ximage.red/green/blue_mask fields */
+         /* flip Y axis for dest position */
+         dstY = FLIP(xmesa->xm_draw_buffer, dstY) - h + 1;
+         XPutImage(dpy, buffer, gc, &ximage, 0, 0, dstX, dstY, w, h);
+      }
+   }
+   else {
+      /* software fallback */
+      _swrast_DrawPixels(ctx, x, y, width, height,
+                         format, type, unpack, pixels);
+   }
+}
+
+
+
+/**
+ * Implement glCopyPixels for the front color buffer (or back buffer Pixmap)
+ * for the color buffer.  Don't support zooming, pixel transfer, etc.
+ * We do support copying from one window to another, ala glXMakeCurrentRead.
+ */
+static void
+xmesa_CopyPixels( GLcontext *ctx,
+                  GLint srcx, GLint srcy, GLsizei width, GLsizei height,
+                  GLint destx, GLint desty, GLenum type )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   const SWcontext *swrast = SWRAST_CONTEXT( ctx );
+   XMesaDisplay *dpy = xmesa->xm_visual->display;
+   const XMesaDrawable drawBuffer = xmesa->xm_draw_buffer->buffer;
+   const XMesaDrawable readBuffer = xmesa->xm_read_buffer->buffer;
+   const XMesaGC gc = xmesa->xm_draw_buffer->gc;
+
+   ASSERT(dpy);
+   ASSERT(gc);
+
+   if (swrast->NewState)
+      _swrast_validate_derived( ctx );
+
+   if (ctx->Color.DrawBuffer == GL_FRONT &&
+       ctx->Pixel.ReadBuffer == GL_FRONT &&
+       drawBuffer &&  /* buffer != 0 means it's a Window or Pixmap */
+       readBuffer &&
+       type == GL_COLOR &&
+       (swrast->_RasterMask & ~CLIP_BIT) == 0 && /* no blend, z-test, etc */
+       ctx->_ImageTransferState == 0 &&  /* no color tables, scale/bias, etc */
+       ctx->Pixel.ZoomX == 1.0 &&        /* no zooming */
+       ctx->Pixel.ZoomY == 1.0) {
+      /* Note: we don't do any special clipping work here.  We could,
+       * but X will do it for us.
+       */
+      srcy = FLIP(xmesa->xm_read_buffer, srcy) - height + 1;
+      desty = FLIP(xmesa->xm_draw_buffer, desty) - height + 1;
+      XCopyArea(dpy, readBuffer, drawBuffer, gc,
+                srcx, srcy, width, height, destx, desty);
+   }
+   else {
+      _swrast_CopyPixels(ctx, srcx, srcy, width, height, destx, desty, type );
+   }
+}
+#endif /* XFree86Server */
+
+
+
+/*
+ * Every driver should implement a GetString function in order to
+ * return a meaningful GL_RENDERER string.
+ */
+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 *) "Mesa project: www.mesa3d.org";
+#else
+         return NULL;
+#endif
+      default:
+         return NULL;
+   }
+}
+
+
+/*
+ * We implement the glEnable function only because we care about
+ * dither enable/disable.
+ */
+static void
+enable( GLcontext *ctx, GLenum pname, GLboolean state )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+
+   switch (pname) {
+      case GL_DITHER:
+         if (state)
+            xmesa->pixelformat = xmesa->xm_visual->dithered_pf;
+         else
+            xmesa->pixelformat = xmesa->xm_visual->undithered_pf;
+         break;
+      default:
+         ;  /* silence compiler warning */
+   }
+}
+
+
+void xmesa_update_state( GLcontext *ctx, GLuint new_state )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+
+   /* Propogate statechange information to swrast and swrast_setup
+    * modules.  The X11 driver has no internal GL-dependent state.
+    */
+   _swrast_InvalidateState( ctx, new_state );
+   _ac_InvalidateState( ctx, new_state );
+   _tnl_InvalidateState( ctx, new_state );
+   _swsetup_InvalidateState( ctx, new_state );
+
+
+   /* setup pointers to front and back buffer clear functions */
+   xmesa->xm_draw_buffer->front_clear_func = clear_front_pixmap;
+   if (xmesa->xm_draw_buffer->backpixmap != XIMAGE) {
+      xmesa->xm_draw_buffer->back_clear_func = clear_back_pixmap;
+   }
+   else if (sizeof(GLushort)!=2 || sizeof(GLuint)!=4) {
+      xmesa->xm_draw_buffer->back_clear_func = clear_nbit_ximage;
+   }
+   else switch (xmesa->xm_visual->BitsPerPixel) {
+   case 8:
+      if (xmesa->xm_visual->hpcr_clear_flag) {
+	 xmesa->xm_draw_buffer->back_clear_func = clear_HPCR_ximage;
+      }
+      else {
+	 xmesa->xm_draw_buffer->back_clear_func = clear_8bit_ximage;
+      }
+      break;
+   case 16:
+      xmesa->xm_draw_buffer->back_clear_func = clear_16bit_ximage;
+      break;
+   case 24:
+      xmesa->xm_draw_buffer->back_clear_func = clear_24bit_ximage;
+      break;
+   case 32:
+      xmesa->xm_draw_buffer->back_clear_func = clear_32bit_ximage;
+      break;
+   default:
+      xmesa->xm_draw_buffer->back_clear_func = clear_nbit_ximage;
+      break;
+   }
+
+   if (ctx->Color._DrawDestMask & (DD_FRONT_LEFT_BIT | DD_BACK_LEFT_BIT)) {
+      xmesa_update_span_funcs(ctx);
+   }
+}
+
+
+
+/**
+ * Called via ctx->Driver.TestProxyTeximage().  Normally, we'd just use
+ * the _mesa_test_proxy_teximage() fallback function, but we're going to
+ * special-case the 3D texture case to allow textures up to 512x512x32
+ * texels.
+ */
+static GLboolean
+test_proxy_teximage(GLcontext *ctx, GLenum target, GLint level,
+                    GLint internalFormat, GLenum format, GLenum type,
+                    GLint width, GLint height, GLint depth, GLint border)
+{
+   if (target == GL_PROXY_TEXTURE_3D) {
+      /* special case for 3D textures */
+      if (width * height * depth > 512 * 512 * 64 ||
+          width  < 2 * border ||
+          (!ctx->Extensions.ARB_texture_non_power_of_two &&
+           _mesa_bitcount(width  - 2 * border) != 1) ||
+          height < 2 * border ||
+          (!ctx->Extensions.ARB_texture_non_power_of_two &&
+           _mesa_bitcount(height - 2 * border) != 1) ||
+          depth  < 2 * border ||
+          (!ctx->Extensions.ARB_texture_non_power_of_two &&
+           _mesa_bitcount(depth  - 2 * border) != 1)) {
+         /* Bad size, or too many texels */
+         return GL_FALSE;
+      }
+      return GL_TRUE;
+   }
+   else {
+      /* use the fallback routine for 1D, 2D, cube and rect targets */
+      return _mesa_test_proxy_teximage(ctx, target, level, internalFormat,
+                                       format, type, width, height, depth,
+                                       border);
+   }
+}
+
+
+/**
+ * Initialize the device driver function table with the functions
+ * we implement in this driver.
+ */
+void xmesa_init_driver_functions( XMesaVisual xmvisual,
+                                  struct dd_function_table *driver )
+{
+   driver->GetString = get_string;
+   driver->UpdateState = xmesa_update_state;
+   driver->GetBufferSize = get_buffer_size;
+   driver->Flush = finish_or_flush;
+   driver->Finish = finish_or_flush;
+   driver->ClearIndex = clear_index;
+   driver->ClearColor = clear_color;
+   driver->IndexMask = index_mask;
+   driver->ColorMask = color_mask;
+   driver->Enable = enable;
+   driver->Clear = clear_buffers;
+   driver->ResizeBuffers = xmesa_resize_buffers;
+#ifndef XFree86Server
+   driver->CopyPixels = /*_swrast_CopyPixels;*/xmesa_CopyPixels;
+   if (xmvisual->undithered_pf == PF_8R8G8B &&
+       xmvisual->dithered_pf == PF_8R8G8B) {
+      driver->DrawPixels = xmesa_DrawPixels_8R8G8B;
+   }
+   else if (xmvisual->undithered_pf == PF_5R6G5B) {
+      driver->DrawPixels = xmesa_DrawPixels_5R6G5B;
+   }
+#endif
+   driver->TestProxyTexImage = test_proxy_teximage;
+}
+
+
+#define XMESA_NEW_POINT  (_NEW_POINT | \
+                          _NEW_RENDERMODE | \
+                          _SWRAST_NEW_RASTERMASK)
+
+#define XMESA_NEW_LINE   (_NEW_LINE | \
+                          _NEW_TEXTURE | \
+                          _NEW_LIGHT | \
+                          _NEW_DEPTH | \
+                          _NEW_RENDERMODE | \
+                          _SWRAST_NEW_RASTERMASK)
+
+#define XMESA_NEW_TRIANGLE (_NEW_POLYGON | \
+                            _NEW_TEXTURE | \
+                            _NEW_LIGHT | \
+                            _NEW_DEPTH | \
+                            _NEW_RENDERMODE | \
+                            _SWRAST_NEW_RASTERMASK)
+
+
+/* Extend the software rasterizer with our line/point/triangle
+ * functions.
+ */
+void xmesa_register_swrast_functions( GLcontext *ctx )
+{
+   SWcontext *swrast = SWRAST_CONTEXT( ctx );
+   struct swrast_device_driver *dd = _swrast_GetDeviceDriverReference(ctx);
+
+   dd->SetBuffer = xmesa_set_buffer;
+
+   swrast->choose_point = xmesa_choose_point;
+   swrast->choose_line = xmesa_choose_line;
+   swrast->choose_triangle = xmesa_choose_triangle;
+
+   swrast->invalidate_point |= XMESA_NEW_POINT;
+   swrast->invalidate_line |= XMESA_NEW_LINE;
+   swrast->invalidate_triangle |= XMESA_NEW_TRIANGLE;
+}