Lots of changes related to framebuffer/window buffer resizing. Basically,

instead of passing a GLcontext* to ResizeBuffers(), pass a GLframebuffer*.
The idea is that a window can be resized without it being bound to a rendering
context.  This makes for a nice clean-up in the XFree86 server-side GLX code.
Renamed ctx->Driver.ResizeBuffersMESA() to ctx->Driver.ResizeBuffers().

21 files changed, 281 insertions, 240 deletions

diff --git a/src/mesa/drivers/dos/dmesa.c b/src/mesa/drivers/dos/dmesa.c
index 454b891c08..d150cdca5a 100644
--- a/src/mesa/drivers/dos/dmesa.c
+++ b/src/mesa/drivers/dos/dmesa.c
@@ -540,8 +540,13 @@ static GLboolean set_draw_buffer (GLcontext *ctx, GLenum mode)
  * If anything special has to been done when the buffer/window is

  * resized, do it now.

  */

-static void get_buffer_size (GLcontext *ctx, GLuint *width, GLuint *height)

+static void get_buffer_size (GLframebuffer *buffer, GLuint *width, GLuint *height)

 {

+ /* XXX this may not be right.  We should query the size of the DOS window

+  * associated with <buffer>.    This function should work whether or

+  * not there is a current context.

+  */

+ GET_CURRENT_CONTEXT(ctx);

  DMesaContext c = (DMesaContext)ctx->DriverCtx;

 

  *width  = c->Buffer->width;

@@ -636,7 +641,7 @@ void dmesa_init_pointers (GLcontext *ctx)
  ctx->Driver.Accum = _swrast_Accum;

  ctx->Driver.Bitmap = _swrast_Bitmap;

  ctx->Driver.Clear = clear;

- ctx->Driver.ResizeBuffersMESA = _swrast_alloc_buffers;

+ ctx->Driver.ResizeBuffers = _swrast_alloc_buffers;

  ctx->Driver.CopyPixels = _swrast_CopyPixels;

  ctx->Driver.DrawPixels = _swrast_DrawPixels;

  ctx->Driver.ReadPixels = _swrast_ReadPixels;

diff --git a/src/mesa/drivers/glide/fxdd.c b/src/mesa/drivers/glide/fxdd.c
index 720ef41d3f..8cdbe35382 100644
--- a/src/mesa/drivers/glide/fxdd.c
+++ b/src/mesa/drivers/glide/fxdd.c
@@ -1,4 +1,4 @@
-/* $Id: fxdd.c,v 1.84 2001/09/23 16:50:01 brianp Exp $ */
+/* $Id: fxdd.c,v 1.85 2002/03/16 00:53:15 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
@@ -103,19 +103,22 @@ fxInitPixelTables(fxMesaContext fxMesa, GLboolean bgrOrder)
 
 /* Return buffer size information */
 static void
-fxDDBufferSize(GLcontext * ctx, GLuint * width, GLuint * height)
+fxDDBufferSize(GLframebuffer *buffer, GLuint * width, GLuint * height)
 {
-   fxMesaContext fxMesa = (fxMesaContext) ctx->DriverCtx;
+   GET_CURRENT_CONTEXT(ctx);
+   if (ctx && ctx->DriverCtx) {
+      fxMesaContext fxMesa = (fxMesaContext) ctx->DriverCtx;
 
-   if (MESA_VERBOSE & VERBOSE_DRIVER) {
-      fprintf(stderr, "fxmesa: fxDDBufferSize(...) Start\n");
-   }
+      if (MESA_VERBOSE & VERBOSE_DRIVER) {
+         fprintf(stderr, "fxmesa: fxDDBufferSize(...) Start\n");
+      }
 
-   *width = fxMesa->width;
-   *height = fxMesa->height;
+      *width = fxMesa->width;
+      *height = fxMesa->height;
 
-   if (MESA_VERBOSE & VERBOSE_DRIVER) {
-      fprintf(stderr, "fxmesa: fxDDBufferSize(...) End\n");
+      if (MESA_VERBOSE & VERBOSE_DRIVER) {
+         fprintf(stderr, "fxmesa: fxDDBufferSize(...) End\n");
+      }
    }
 }
 
@@ -1002,7 +1005,7 @@ fxSetupDDPointers(GLcontext * ctx)
    ctx->Driver.CopyPixels = _swrast_CopyPixels;
    ctx->Driver.DrawPixels = _swrast_DrawPixels;
    ctx->Driver.ReadPixels = fxDDReadPixels;
-   ctx->Driver.ResizeBuffersMESA = _swrast_alloc_buffers;
+   ctx->Driver.ResizeBuffers = _swrast_alloc_buffers;
    ctx->Driver.Finish = fxDDFinish;
    ctx->Driver.Flush = NULL;
    ctx->Driver.ChooseTextureFormat = fxDDChooseTextureFormat;
diff --git a/src/mesa/drivers/osmesa/osmesa.c b/src/mesa/drivers/osmesa/osmesa.c
index 842ad6652b..1cc7439afd 100644
--- a/src/mesa/drivers/osmesa/osmesa.c
+++ b/src/mesa/drivers/osmesa/osmesa.c
@@ -1,4 +1,4 @@
-/* $Id: osmesa.c,v 1.74 2002/03/01 04:23:36 brianp Exp $ */
+/* $Id: osmesa.c,v 1.75 2002/03/16 00:53:15 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
@@ -875,11 +875,15 @@ static void clear( GLcontext *ctx, GLbitfield mask, GLboolean all,
 
 
 
-static void buffer_size( GLcontext *ctx, GLuint *width, GLuint *height )
+static void buffer_size( GLframebuffer *buffer, GLuint *width, GLuint *height )
 {
-   OSMesaContext osmesa = OSMESA_CONTEXT(ctx);
-   *width = osmesa->width;
-   *height = osmesa->height;
+   GET_CURRENT_CONTEXT(ctx);
+   (void) buffer;
+   if (ctx) {
+      OSMesaContext osmesa = OSMESA_CONTEXT(ctx);
+      *width = osmesa->width;
+      *height = osmesa->height;
+   }
 }
 
 
@@ -2023,7 +2027,7 @@ static void osmesa_update_state( GLcontext *ctx, GLuint new_state )
    ctx->Driver.GetString = get_string;
    ctx->Driver.UpdateState = osmesa_update_state;
    ctx->Driver.SetDrawBuffer = set_draw_buffer;
-   ctx->Driver.ResizeBuffersMESA = _swrast_alloc_buffers;
+   ctx->Driver.ResizeBuffers = _swrast_alloc_buffers;
    ctx->Driver.GetBufferSize = buffer_size;
 
    ctx->Driver.Accum = _swrast_Accum;
diff --git a/src/mesa/drivers/svga/svgamesa.c b/src/mesa/drivers/svga/svgamesa.c
index db97d20194..c841f46f01 100644
--- a/src/mesa/drivers/svga/svgamesa.c
+++ b/src/mesa/drivers/svga/svgamesa.c
@@ -1,4 +1,4 @@
-/* $Id: svgamesa.c,v 1.16 2001/09/23 16:11:27 brianp Exp $ */
+/* $Id: svgamesa.c,v 1.17 2002/03/16 00:53:15 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
@@ -210,7 +210,7 @@ static void copy_buffer( const GLubyte * buffer) {
  }
 }
 
-static void get_buffer_size( GLcontext *ctx, GLuint *width, GLuint *height )
+static void get_buffer_size( GLframebuffer *buffer, GLuint *width, GLuint *height )
 {
    *width = SVGAMesa->width = vga_getxdim();
    *height = SVGAMesa->height = vga_getydim();
@@ -286,6 +286,7 @@ static void svgamesa_update_state( GLcontext *ctx, GLuint new_state )
 
    ctx->Driver.GetBufferSize = get_buffer_size;
    ctx->Driver.SetDrawBuffer = set_draw_buffer;
+   ctx->Driver.ResizeBuffers = _swrast_alloc_buffers;
 
    /* Software rasterizer pixel paths:
     */
diff --git a/src/mesa/drivers/windows/wmesa.c b/src/mesa/drivers/windows/wmesa.c
index 47edef993e..4f057bfad7 100644
--- a/src/mesa/drivers/windows/wmesa.c
+++ b/src/mesa/drivers/windows/wmesa.c
@@ -1,4 +1,4 @@
-/* $Id: wmesa.c,v 1.25 2002/01/16 15:42:17 kschultz Exp $ */
+/* $Id: wmesa.c,v 1.26 2002/03/16 00:53:15 brianp Exp $ */
 
 /*
  * Windows (Win32) device driver for Mesa 3.4
@@ -583,8 +583,9 @@ static void set_read_buffer(GLcontext *ctx, GLframebuffer *colorBuffer,
 
 
 /* Return characteristics of the output buffer. */
-static void buffer_size( GLcontext* ctx, GLuint *width, GLuint *height )
+static void buffer_size( GLframebuffer *buffer, GLuint *width, GLuint *height )
 {
+  GET_CURRENT_CONTEXT(ctx);
   int New_Size;
   RECT CR;
   
@@ -1021,7 +1022,7 @@ static void SetFunctionPointers(GLcontext *ctx)
   ctx->Driver.GetString = get_string;
   ctx->Driver.UpdateState = wmesa_update_state;
   ctx->Driver.SetDrawBuffer = set_draw_buffer;
-  ctx->Driver.ResizeBuffersMESA = _swrast_alloc_buffers;
+  ctx->Driver.ResizeBuffers = _swrast_alloc_buffers;
   ctx->Driver.GetBufferSize = buffer_size;
   
   ctx->Driver.Accum = _swrast_Accum;
@@ -1100,7 +1101,7 @@ static void wmesa_update_state( GLcontext *ctx, GLuint new_state )
   ctx->Driver.GetString = get_string;
   ctx->Driver.UpdateState = wmesa_update_state;
   ctx->Driver.SetDrawBuffer = set_draw_buffer;
-  ctx->Driver.ResizeBuffersMESA = _swrast_alloc_buffers;
+  ctx->Driver.ResizeBuffers = _swrast_alloc_buffers;
   ctx->Driver.GetBufferSize = buffer_size;
   
   ctx->Driver.Accum = _swrast_Accum;
diff --git a/src/mesa/drivers/x11/xm_api.c b/src/mesa/drivers/x11/xm_api.c
index ce5576d68d..9ee36a45ca 100644
--- a/src/mesa/drivers/x11/xm_api.c
+++ b/src/mesa/drivers/x11/xm_api.c
@@ -1,8 +1,8 @@
-/* $Id: xm_api.c,v 1.34 2002/03/12 21:55:50 brianp Exp $ */
+/* $Id: xm_api.c,v 1.35 2002/03/16 00:53:15 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
- * Version:  4.1
+ * Version:  4.0.2
  *
  * Copyright (C) 1999-2002  Brian Paul   All Rights Reserved.
  *
@@ -2329,9 +2329,8 @@ void XMesaSwapBuffers( XMesaBuffer b )
    /* If we're swapping the buffer associated with the current context
     * we have to flush any pending rendering commands first.
     */
-   if (ctx && ctx->DrawBuffer == &(b->mesa_buffer)) {
+   if (ctx && ctx->DrawBuffer == &(b->mesa_buffer))
       _mesa_swapbuffers(ctx);
-   }
 
    if (b->db_state) {
 #ifdef FX
@@ -2630,3 +2629,13 @@ unsigned long XMesaDitherColor( XMesaContext xmesa, GLint x, GLint y,
 }
 
 
+/*
+ * This is typically called when the window size changes and we need
+ * to reallocate the buffer's back/depth/stencil/accum buffers.
+ */
+void XMesaResizeBuffers( XMesaBuffer b )
+{
+   xmesa_resize_buffers( &(b->mesa_buffer) );
+
+}
+
diff --git a/src/mesa/drivers/x11/xm_dd.c b/src/mesa/drivers/x11/xm_dd.c
index ec79f3c514..642aee8a22 100644
--- a/src/mesa/drivers/x11/xm_dd.c
+++ b/src/mesa/drivers/x11/xm_dd.c
@@ -1,8 +1,8 @@
-/* $Id: xm_dd.c,v 1.29 2002/03/01 04:28:32 brianp Exp $ */
+/* $Id: xm_dd.c,v 1.30 2002/03/16 00:53:15 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
- * Version:  4.1
+ * Version:  4.0.2
  *
  * Copyright (C) 1999-2002  Brian Paul   All Rights Reserved.
  *
@@ -48,17 +48,18 @@
 
 
 /*
- * 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.
+ * 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( GLcontext *ctx, GLuint *width, GLuint *height )
+get_buffer_size( GLframebuffer *buffer, GLuint *width, GLuint *height )
 {
-   const XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
+   /* 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;
 #ifndef XFree86Server
    Window root;
@@ -66,58 +67,19 @@ get_buffer_size( GLcontext *ctx, GLuint *width, GLuint *height )
    unsigned int bw, d;
 
    _glthread_LOCK_MUTEX(_xmesa_lock);
-   XGetGeometry( xmesa->display, xmesa->xm_buffer->frontbuffer, &root,
+   XGetGeometry( xmBuffer->xm_visual->display, xmBuffer->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;
+   /* XFree86 GLX renderer */
+   winwidth = xmBuffer->frontbuffer->width;
+   winheight = xmBuffer->frontbuffer->height;
 #endif
 
    (void)kernel8;		/* Muffle compiler */
 
    *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);
-   }
 }
 
 
@@ -780,10 +742,51 @@ clear_buffers( GLcontext *ctx, GLbitfield mask,
 }
 
 
-static void
-resize_buffers( GLcontext *ctx )
+/*
+ * 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 )
 {
-   _swrast_alloc_buffers( ctx );
+   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 );
 }
 
 #if 0
@@ -951,7 +954,7 @@ void xmesa_init_pointers( GLcontext *ctx )
    ctx->Driver.Accum = _swrast_Accum;
    ctx->Driver.Bitmap = _swrast_Bitmap;
    ctx->Driver.Clear = clear_buffers;
-   ctx->Driver.ResizeBuffersMESA = resize_buffers;
+   ctx->Driver.ResizeBuffers = xmesa_resize_buffers;
    ctx->Driver.CopyPixels = _swrast_CopyPixels;
    ctx->Driver.DrawPixels = _swrast_DrawPixels;
    ctx->Driver.ReadPixels = _swrast_ReadPixels;
diff --git a/src/mesa/drivers/x11/xmesaP.h b/src/mesa/drivers/x11/xmesaP.h
index 409ea22567..d61ee88e55 100644
--- a/src/mesa/drivers/x11/xmesaP.h
+++ b/src/mesa/drivers/x11/xmesaP.h
@@ -1,8 +1,8 @@
-/* $Id: xmesaP.h,v 1.26 2002/03/12 21:55:50 brianp Exp $ */
+/* $Id: xmesaP.h,v 1.27 2002/03/16 00:53:15 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
- * Version:  4.2
+ * Version:  4.0.2
  *
  * Copyright (C) 1999-2002  Brian Paul   All Rights Reserved.
  *
@@ -532,4 +532,6 @@ extern void XMesaReset( void );
 extern void xmesa_set_read_buffer( GLcontext *ctx, 
 				   GLframebuffer *buffer, GLenum mode );
 
+extern void xmesa_resize_buffers( GLframebuffer *buffer );
+
 #endif
diff --git a/src/mesa/main/buffers.c b/src/mesa/main/buffers.c
index b4feb219fb..be793417d4 100644
--- a/src/mesa/main/buffers.c
+++ b/src/mesa/main/buffers.c
@@ -1,4 +1,4 @@
-/* $Id: buffers.c,v 1.32 2002/02/15 16:25:16 brianp Exp $ */
+/* $Id: buffers.c,v 1.33 2002/03/16 00:53:15 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
@@ -350,33 +350,59 @@ _mesa_ReadBuffer( GLenum mode )
 
 /*
  * GL_MESA_resize_buffers extension
+ * When this function is called, we'll ask the window system how large
+ * the current window is.  If it's not what we expect, we'll have to
+ * resize/reallocate the software accum/stencil/depth/alpha buffers.
  */
 void
 _mesa_ResizeBuffersMESA( void )
 {
    GLcontext *ctx = _mesa_get_current_context();
-   GLuint buf_width, buf_height;
-   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH( ctx );
-
 
    if (MESA_VERBOSE & VERBOSE_API)
       fprintf(stderr, "glResizeBuffersMESA\n");
 
-   /* ask device driver for size of output buffer */
-   (*ctx->Driver.GetBufferSize)( ctx, &buf_width, &buf_height );
+   if (ctx) {
+      ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH( ctx );
 
-   /* see if size of device driver's color buffer (window) has changed */
-   if (ctx->DrawBuffer->Width == (GLint) buf_width &&
-       ctx->DrawBuffer->Height == (GLint) buf_height)
-      return;
+      if (ctx->DrawBuffer) {
+         GLuint buf_width, buf_height;
+         GLframebuffer *buffer = ctx->DrawBuffer;
+
+         /* ask device driver for size of output buffer */
+         (*ctx->Driver.GetBufferSize)( buffer, &buf_width, &buf_height );
 
-   ctx->NewState |= _NEW_BUFFERS;  /* to update scissor / window bounds */
+         /* see if size of device driver's color buffer (window) has changed */
+         if (buffer->Width == (GLint) buf_width &&
+             buffer->Height == (GLint) buf_height)
+            return; /* size is as expected */
+
+         buffer->Width = buf_width;
+         buffer->Height = buf_height;
+
+         ctx->Driver.ResizeBuffers( buffer );
+      }
 
-   /* save buffer size */
-   ctx->DrawBuffer->Width = buf_width;
-   ctx->DrawBuffer->Height = buf_height;
+      if (ctx->ReadBuffer && ctx->ReadBuffer != ctx->DrawBuffer) {
+         GLuint buf_width, buf_height;
+         GLframebuffer *buffer = ctx->DrawBuffer;
 
-   ctx->Driver.ResizeBuffersMESA( ctx );
+         /* ask device driver for size of output buffer */
+         (*ctx->Driver.GetBufferSize)( buffer, &buf_width, &buf_height );
+
+         /* see if size of device driver's color buffer (window) has changed */
+         if (buffer->Width == (GLint) buf_width &&
+             buffer->Height == (GLint) buf_height)
+            return; /* size is as expected */
+
+         buffer->Width = buf_width;
+         buffer->Height = buf_height;
+
+         ctx->Driver.ResizeBuffers( buffer );
+      }
+
+      ctx->NewState |= _NEW_BUFFERS;  /* to update scissor / window bounds */
+   }
 }
 
 
diff --git a/src/mesa/main/context.c b/src/mesa/main/context.c
index 18477f3277..5ed31a18bc 100644
--- a/src/mesa/main/context.c
+++ b/src/mesa/main/context.c
@@ -1,4 +1,4 @@
-/* $Id: context.c,v 1.155 2002/03/13 04:33:32 brianp Exp $ */
+/* $Id: context.c,v 1.156 2002/03/16 00:53:15 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
@@ -2084,6 +2084,9 @@ _mesa_error( GLcontext *ctx, GLenum error, const char *where )
       fprintf(stderr, "Mesa user error: %s in %s\n", errstr, where);
    }
 
+   if (!ctx)
+      return;
+
    if (ctx->ErrorValue == GL_NO_ERROR) {
       ctx->ErrorValue = error;
    }
diff --git a/src/mesa/main/mtypes.h b/src/mesa/main/mtypes.h
index efa26afe8b..807a7b24cc 100644
--- a/src/mesa/main/mtypes.h
+++ b/src/mesa/main/mtypes.h
@@ -1,4 +1,4 @@
-/* $Id: mtypes.h,v 1.66 2002/03/13 04:33:16 brianp Exp $ */
+/* $Id: mtypes.h,v 1.67 2002/03/16 00:53:15 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
@@ -1312,7 +1312,7 @@ struct gl_shared_state {
 struct gl_frame_buffer {
    GLvisual Visual;		/* The corresponding visual */
 
-   GLint Width, Height;		/* size of frame buffer in pixels */
+   GLuint Width, Height;	/* size of frame buffer in pixels */
 
    GLboolean UseSoftwareDepthBuffer;
    GLboolean UseSoftwareAccumBuffer;
diff --git a/src/mesa/swrast/s_accum.c b/src/mesa/swrast/s_accum.c
index 167a655f33..faf8313d4d 100644
--- a/src/mesa/swrast/s_accum.c
+++ b/src/mesa/swrast/s_accum.c
@@ -1,4 +1,4 @@
-/* $Id: s_accum.c,v 1.14 2002/02/02 17:24:11 brianp Exp $ */
+/* $Id: s_accum.c,v 1.15 2002/03/16 00:53:15 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
@@ -67,38 +67,38 @@
 #endif
 
 
-
 void
-_mesa_alloc_accum_buffer( GLcontext *ctx )
+_mesa_alloc_accum_buffer( GLframebuffer *buffer )
 {
-   SWcontext *swrast = SWRAST_CONTEXT(ctx);
+   GET_CURRENT_CONTEXT(ctx);
    GLint n;
 
-   if (ctx->DrawBuffer->Accum) {
-      FREE( ctx->DrawBuffer->Accum );
-      ctx->DrawBuffer->Accum = NULL;
+   if (buffer->Accum) {
+      FREE( buffer->Accum );
+      buffer->Accum = NULL;
    }
 
    /* allocate accumulation buffer if not already present */
-   n = ctx->DrawBuffer->Width * ctx->DrawBuffer->Height * 4 * sizeof(GLaccum);
-   ctx->DrawBuffer->Accum = (GLaccum *) MALLOC( n );
-   if (!ctx->DrawBuffer->Accum) {
+   n = buffer->Width * buffer->Height * 4 * sizeof(GLaccum);
+   buffer->Accum = (GLaccum *) MALLOC( n );
+   if (!buffer->Accum) {
       /* unable to setup accumulation buffer */
-      _mesa_error( ctx, GL_OUT_OF_MEMORY, "glAccum" );
+      _mesa_error( NULL, GL_OUT_OF_MEMORY, "glAccum" );
    }
+
+   if (ctx) {
+      SWcontext *swrast = SWRAST_CONTEXT(ctx);
+      /* XXX these fields should probably be in the GLframebuffer */
 #ifdef USE_OPTIMIZED_ACCUM
-   swrast->_IntegerAccumMode = GL_TRUE;
+      swrast->_IntegerAccumMode = GL_TRUE;
 #else
-   swrast->_IntegerAccumMode = GL_FALSE;
+      swrast->_IntegerAccumMode = GL_FALSE;
 #endif
-   swrast->_IntegerAccumScaler = 0.0;
+      swrast->_IntegerAccumScaler = 0.0;
+   }
 }
 
 
-
-
-
-
 /*
  * This is called when we fall out of optimized/unscaled accum buffer mode.
  * That is, we convert each unscaled accum buffer value into a scaled value
diff --git a/src/mesa/swrast/s_accum.h b/src/mesa/swrast/s_accum.h
index 014ca98b94..d46235d5e3 100644
--- a/src/mesa/swrast/s_accum.h
+++ b/src/mesa/swrast/s_accum.h
@@ -1,10 +1,10 @@
-/* $Id: s_accum.h,v 1.3 2001/03/12 00:48:41 gareth Exp $ */
+/* $Id: s_accum.h,v 1.4 2002/03/16 00:53:15 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
- * Version:  3.5
+ * Version:  4.0.2
  *
- * Copyright (C) 1999-2001  Brian Paul   All Rights Reserved.
+ * Copyright (C) 1999-2002  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"),
@@ -34,12 +34,11 @@
 
 
 extern void
-_mesa_alloc_accum_buffer( GLcontext *ctx );
+_mesa_alloc_accum_buffer( GLframebuffer *buffer );
 
 
 extern void
 _mesa_clear_accum_buffer( GLcontext *ctx );
 
 
-
 #endif
diff --git a/src/mesa/swrast/s_alphabuf.c b/src/mesa/swrast/s_alphabuf.c
index 2a066aeee7..2b7c4f7de2 100644
--- a/src/mesa/swrast/s_alphabuf.c
+++ b/src/mesa/swrast/s_alphabuf.c
@@ -1,10 +1,10 @@
-/* $Id: s_alphabuf.c,v 1.8 2001/07/13 20:07:37 brianp Exp $ */
+/* $Id: s_alphabuf.c,v 1.9 2002/03/16 00:53:15 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
- * Version:  3.5
+ * Version:  4.0.2
  *
- * Copyright (C) 1999-2001  Brian Paul   All Rights Reserved.
+ * Copyright (C) 1999-2002  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"),
@@ -38,8 +38,6 @@
 #include "s_alphabuf.h"
 
 
-
-
 #define ALPHA_DRAW_ADDR(X,Y) \
    (ctx->DrawBuffer->Alpha + (Y) * ctx->DrawBuffer->Width + (X))
 
@@ -47,85 +45,72 @@
    (ctx->ReadBuffer->Alpha + (Y) * ctx->ReadBuffer->Width + (X))
 
 
-
 /*
- * Allocate new front/back/left/right alpha buffers.
- * Input: ctx - the context
- *
+ * Allocate a new front and back alpha buffer.
  */
-static void
-alloc_alpha_buffers( GLcontext *ctx, GLframebuffer *buf )
+void
+_mesa_alloc_alpha_buffers( GLframebuffer *buffer )
 {
-   GLint bytes = buf->Width * buf->Height * sizeof(GLchan);
+   GET_CURRENT_CONTEXT(ctx);
+   const GLint bytes = buffer->Width * buffer->Height * sizeof(GLchan);
 
-   ASSERT(ctx->DrawBuffer->UseSoftwareAlphaBuffers);
+   ASSERT(buffer->UseSoftwareAlphaBuffers);
 
-   if (buf->FrontLeftAlpha) {
-      FREE( buf->FrontLeftAlpha );
+   if (buffer->FrontLeftAlpha) {
+      FREE( buffer->FrontLeftAlpha );
    }
-   buf->FrontLeftAlpha = (GLchan *) MALLOC( bytes );
-   if (!buf->FrontLeftAlpha) {
+   buffer->FrontLeftAlpha = (GLchan *) MALLOC( bytes );
+   if (!buffer->FrontLeftAlpha) {
       /* out of memory */
-      _mesa_error( ctx, GL_OUT_OF_MEMORY,
-                "Couldn't allocate front-left alpha buffer" );
+      _mesa_error( NULL, GL_OUT_OF_MEMORY,
+                   "Couldn't allocate front-left alpha buffer" );
    }
 
-   if (ctx->Visual.doubleBufferMode) {
-      if (buf->BackLeftAlpha) {
-         FREE( buf->BackLeftAlpha );
+   if (buffer->Visual.doubleBufferMode) {
+      if (buffer->BackLeftAlpha) {
+         FREE( buffer->BackLeftAlpha );
       }
-      buf->BackLeftAlpha = (GLchan *) MALLOC( bytes );
-      if (!buf->BackLeftAlpha) {
+      buffer->BackLeftAlpha = (GLchan *) MALLOC( bytes );
+      if (!buffer->BackLeftAlpha) {
          /* out of memory */
-         _mesa_error( ctx, GL_OUT_OF_MEMORY,
+         _mesa_error( NULL, GL_OUT_OF_MEMORY,
                       "Couldn't allocate back-left alpha buffer" );
       }
    }
 
-   if (ctx->Visual.stereoMode) {
-      if (buf->FrontRightAlpha) {
-         FREE( buf->FrontRightAlpha );
+   if (buffer->Visual.stereoMode) {
+      if (buffer->FrontRightAlpha) {
+         FREE( buffer->FrontRightAlpha );
       }
-      buf->FrontRightAlpha = (GLchan *) MALLOC( bytes );
-      if (!buf->FrontRightAlpha) {
+      buffer->FrontRightAlpha = (GLchan *) MALLOC( bytes );
+      if (!buffer->FrontRightAlpha) {
          /* out of memory */
-         _mesa_error( ctx, GL_OUT_OF_MEMORY,
-                   "Couldn't allocate front-right alpha buffer" );
+         _mesa_error( NULL, GL_OUT_OF_MEMORY,
+                      "Couldn't allocate front-right alpha buffer" );
       }
 
-      if (ctx->Visual.doubleBufferMode) {
-         if (buf->BackRightAlpha) {
-            FREE( buf->BackRightAlpha );
+      if (buffer->Visual.doubleBufferMode) {
+         if (buffer->BackRightAlpha) {
+            FREE( buffer->BackRightAlpha );
          }
-         buf->BackRightAlpha = (GLchan *) MALLOC( bytes );
-         if (!buf->BackRightAlpha) {
+         buffer->BackRightAlpha = (GLchan *) MALLOC( bytes );
+         if (!buffer->BackRightAlpha) {
             /* out of memory */
-            _mesa_error( ctx, GL_OUT_OF_MEMORY,
-                      "Couldn't allocate back-right alpha buffer" );
+            _mesa_error( NULL, GL_OUT_OF_MEMORY,
+                         "Couldn't allocate back-right alpha buffer" );
          }
       }
    }
 
-   if (ctx->Color.DriverDrawBuffer == GL_FRONT_LEFT)
-      buf->Alpha = buf->FrontLeftAlpha;
-   else if (ctx->Color.DriverDrawBuffer == GL_BACK_LEFT)
-      buf->Alpha = buf->BackLeftAlpha;
-   else if (ctx->Color.DriverDrawBuffer == GL_FRONT_RIGHT)
-      buf->Alpha = buf->FrontRightAlpha;
-   else if (ctx->Color.DriverDrawBuffer == GL_BACK_RIGHT)
-      buf->Alpha = buf->BackRightAlpha;
-}
-
-
-/*
- * Allocate a new front and back alpha buffer.
- */
-void
-_mesa_alloc_alpha_buffers( GLcontext *ctx )
-{
-   alloc_alpha_buffers( ctx, ctx->DrawBuffer );
-   if (ctx->ReadBuffer != ctx->DrawBuffer) {
-      alloc_alpha_buffers( ctx, ctx->ReadBuffer );
+   if (ctx) {
+      if (ctx->Color.DriverDrawBuffer == GL_FRONT_LEFT)
+         buffer->Alpha = buffer->FrontLeftAlpha;
+      else if (ctx->Color.DriverDrawBuffer == GL_BACK_LEFT)
+         buffer->Alpha = buffer->BackLeftAlpha;
+      else if (ctx->Color.DriverDrawBuffer == GL_FRONT_RIGHT)
+         buffer->Alpha = buffer->FrontRightAlpha;
+      else if (ctx->Color.DriverDrawBuffer == GL_BACK_RIGHT)
+         buffer->Alpha = buffer->BackRightAlpha;
    }
 }
 
diff --git a/src/mesa/swrast/s_alphabuf.h b/src/mesa/swrast/s_alphabuf.h
index 889a6c94e6..544ae070b1 100644
--- a/src/mesa/swrast/s_alphabuf.h
+++ b/src/mesa/swrast/s_alphabuf.h
@@ -1,10 +1,10 @@
-/* $Id: s_alphabuf.h,v 1.3 2001/03/12 00:48:41 gareth Exp $ */
+/* $Id: s_alphabuf.h,v 1.4 2002/03/16 00:53:15 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
- * Version:  3.5
+ * Version:  4.0.2
  *
- * Copyright (C) 1999-2001  Brian Paul   All Rights Reserved.
+ * Copyright (C) 1999-2002  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"),
@@ -34,7 +34,7 @@
 
 
 extern void
-_mesa_alloc_alpha_buffers( GLcontext *ctx );
+_mesa_alloc_alpha_buffers( GLframebuffer *buffer );
 
 
 extern void
diff --git a/src/mesa/swrast/s_buffers.c b/src/mesa/swrast/s_buffers.c
index 50515415df..d787acfafb 100644
--- a/src/mesa/swrast/s_buffers.c
+++ b/src/mesa/swrast/s_buffers.c
@@ -1,4 +1,4 @@
-/* $Id: s_buffers.c,v 1.9 2002/02/02 17:24:11 brianp Exp $ */
+/* $Id: s_buffers.c,v 1.10 2002/03/16 00:53:15 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
@@ -242,19 +242,19 @@ _swrast_Clear( GLcontext *ctx, GLbitfield mask,
 
 
 void
-_swrast_alloc_buffers( GLcontext *ctx )
+_swrast_alloc_buffers( GLframebuffer *buffer )
 {
    /* Reallocate other buffers if needed. */
-   if (ctx->DrawBuffer->UseSoftwareDepthBuffer) {
-      _mesa_alloc_depth_buffer( ctx );
+   if (buffer->UseSoftwareDepthBuffer) {
+      _mesa_alloc_depth_buffer( buffer );
    }
-   if (ctx->DrawBuffer->UseSoftwareStencilBuffer) {
-      _mesa_alloc_stencil_buffer( ctx );
+   if (buffer->UseSoftwareStencilBuffer) {
+      _mesa_alloc_stencil_buffer( buffer );
    }
-   if (ctx->DrawBuffer->UseSoftwareAccumBuffer) {
-      _mesa_alloc_accum_buffer( ctx );
+   if (buffer->UseSoftwareAccumBuffer) {
+      _mesa_alloc_accum_buffer( buffer );
    }
-   if (ctx->DrawBuffer->UseSoftwareAlphaBuffers) {
-      _mesa_alloc_alpha_buffers( ctx );
+   if (buffer->UseSoftwareAlphaBuffers) {
+      _mesa_alloc_alpha_buffers( buffer );
    }
 }
diff --git a/src/mesa/swrast/s_depth.c b/src/mesa/swrast/s_depth.c
index a62926cc42..cadb0ecd10 100644
--- a/src/mesa/swrast/s_depth.c
+++ b/src/mesa/swrast/s_depth.c
@@ -1,4 +1,4 @@
-/* $Id: s_depth.c,v 1.17 2002/02/06 03:22:00 brianp Exp $ */
+/* $Id: s_depth.c,v 1.18 2002/03/16 00:53:15 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
@@ -1513,32 +1513,33 @@ _mesa_read_depth_span_float( GLcontext *ctx,
  * This function is only called through Driver.alloc_depth_buffer.
  */
 void
-_mesa_alloc_depth_buffer( GLcontext *ctx )
+_mesa_alloc_depth_buffer( GLframebuffer *buffer )
 {
-   /* deallocate current depth buffer if present */
-   if (ctx->DrawBuffer->UseSoftwareDepthBuffer) {
-      GLint bytesPerValue;
+   GLint bytesPerValue;
 
-      if (ctx->DrawBuffer->DepthBuffer) {
-         FREE(ctx->DrawBuffer->DepthBuffer);
-         ctx->DrawBuffer->DepthBuffer = NULL;
-      }
+   ASSERT(buffer->UseSoftwareDepthBuffer);
 
-      /* allocate new depth buffer, but don't initialize it */
-      if (ctx->Visual.depthBits <= 16)
-         bytesPerValue = sizeof(GLushort);
-      else
-         bytesPerValue = sizeof(GLuint);
+   /* deallocate current depth buffer if present */
+   if (buffer->DepthBuffer) {
+      FREE(buffer->DepthBuffer);
+      buffer->DepthBuffer = NULL;
+   }
+
+   /* allocate new depth buffer, but don't initialize it */
+   if (buffer->Visual.depthBits <= 16)
+      bytesPerValue = sizeof(GLushort);
+   else
+      bytesPerValue = sizeof(GLuint);
 
-      ctx->DrawBuffer->DepthBuffer = MALLOC( ctx->DrawBuffer->Width
-                                             * ctx->DrawBuffer->Height
-                                             * bytesPerValue );
+   buffer->DepthBuffer =MALLOC(buffer->Width * buffer->Height * bytesPerValue);
 
-      if (!ctx->DrawBuffer->DepthBuffer) {
-         /* out of memory */
+   if (!buffer->DepthBuffer) {
+      /* out of memory */
+      GET_CURRENT_CONTEXT(ctx);
+      if (ctx) {
          ctx->Depth.Test = GL_FALSE;
          ctx->NewState |= _NEW_DEPTH;
-         _mesa_error( ctx, GL_OUT_OF_MEMORY, "Couldn't allocate depth buffer" );
+         _mesa_error(ctx, GL_OUT_OF_MEMORY, "Couldn't allocate depth buffer");
       }
    }
 }
diff --git a/src/mesa/swrast/s_depth.h b/src/mesa/swrast/s_depth.h
index 610835c10d..2b7e9ddeb4 100644
--- a/src/mesa/swrast/s_depth.h
+++ b/src/mesa/swrast/s_depth.h
@@ -1,4 +1,4 @@
-/* $Id: s_depth.h,v 1.5 2002/02/04 15:59:29 brianp Exp $ */
+/* $Id: s_depth.h,v 1.6 2002/03/16 00:53:15 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
@@ -54,11 +54,11 @@ _mesa_read_depth_span_float( GLcontext *ctx, GLint n, GLint x, GLint y,
 
 
 extern void
-_mesa_alloc_depth_buffer( GLcontext* ctx );
+_mesa_alloc_depth_buffer( GLframebuffer *buffer );
 
 
 extern void
-_mesa_clear_depth_buffer( GLcontext* ctx );
+_mesa_clear_depth_buffer( GLcontext *ctx );
 
 
 #endif
diff --git a/src/mesa/swrast/s_stencil.c b/src/mesa/swrast/s_stencil.c
index dd438e8dcb..6d62b65fd5 100644
--- a/src/mesa/swrast/s_stencil.c
+++ b/src/mesa/swrast/s_stencil.c
@@ -1,4 +1,4 @@
-/* $Id: s_stencil.c,v 1.20 2002/02/04 15:59:30 brianp Exp $ */
+/* $Id: s_stencil.c,v 1.21 2002/03/16 00:53:15 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
@@ -1112,22 +1112,20 @@ _mesa_write_stencil_span( GLcontext *ctx, GLint n, GLint x, GLint y,
  * deallocated first.  The new stencil buffer will be uninitialized.
  */
 void
-_mesa_alloc_stencil_buffer( GLcontext *ctx )
+_mesa_alloc_stencil_buffer( GLframebuffer *buffer )
 {
-   GLuint buffersize = ctx->DrawBuffer->Width * ctx->DrawBuffer->Height;
-
    /* deallocate current stencil buffer if present */
-   if (ctx->DrawBuffer->Stencil) {
-      FREE(ctx->DrawBuffer->Stencil);
-      ctx->DrawBuffer->Stencil = NULL;
+   if (buffer->Stencil) {
+      FREE(buffer->Stencil);
+      buffer->Stencil = NULL;
    }
 
    /* allocate new stencil buffer */
-   ctx->DrawBuffer->Stencil = (GLstencil *) MALLOC(buffersize * sizeof(GLstencil));
-   if (!ctx->DrawBuffer->Stencil) {
+   buffer->Stencil = (GLstencil *) MALLOC(buffer->Width * buffer->Height
+                                          * sizeof(GLstencil));
+   if (!buffer->Stencil) {
       /* out of memory */
-/*        _mesa_set_enable( ctx, GL_STENCIL_TEST, GL_FALSE ); */
-      _mesa_error( ctx, GL_OUT_OF_MEMORY, "_mesa_alloc_stencil_buffer" );
+      _mesa_error( NULL, GL_OUT_OF_MEMORY, "_mesa_alloc_stencil_buffer" );
    }
 }
 
diff --git a/src/mesa/swrast/s_stencil.h b/src/mesa/swrast/s_stencil.h
index 3658e9dba6..d15b5d2d4a 100644
--- a/src/mesa/swrast/s_stencil.h
+++ b/src/mesa/swrast/s_stencil.h
@@ -1,4 +1,4 @@
-/* $Id: s_stencil.h,v 1.6 2002/02/02 21:40:34 brianp Exp $ */
+/* $Id: s_stencil.h,v 1.7 2002/03/16 00:53:15 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
@@ -50,7 +50,7 @@ _mesa_write_stencil_span( GLcontext *ctx, GLint n, GLint x, GLint y,
 
 
 extern void
-_mesa_alloc_stencil_buffer( GLcontext *ctx );
+_mesa_alloc_stencil_buffer( GLframebuffer *buffer );
 
 
 extern void
diff --git a/src/mesa/swrast/swrast.h b/src/mesa/swrast/swrast.h
index 9359b26dfc..a6c07e5655 100644
--- a/src/mesa/swrast/swrast.h
+++ b/src/mesa/swrast/swrast.h
@@ -1,4 +1,4 @@
-/* $Id: swrast.h,v 1.20 2002/02/02 17:24:11 brianp Exp $ */
+/* $Id: swrast.h,v 1.21 2002/03/16 00:53:15 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
@@ -134,9 +134,10 @@ struct sw_span {
    GLfixed index, indexStep;
    GLfixed z, zStep;
    GLfloat fog, fogStep;
-   GLfloat tex[MAX_TEXTURE_UNITS][4], texStep[MAX_TEXTURE_UNITS][4];
+   GLfloat tex[MAX_TEXTURE_UNITS][4];
+   GLfloat texStepX[MAX_TEXTURE_UNITS][4];
+   GLfloat texStepY[MAX_TEXTURE_UNITS][4];
    GLfixed intTex[2], intTexStep[2];
-   GLfloat rho[MAX_TEXTURE_UNITS]; /* for texture lambda/lod computation */
 
    /**
     * This bitmask (of SPAN_* flags) indicates which of the fragment arrays
@@ -182,7 +183,7 @@ struct swrast_device_driver;
 /* These are the public-access functions exported from swrast.
  */
 extern void
-_swrast_alloc_buffers( GLcontext *ctx );
+_swrast_alloc_buffers( GLframebuffer *buffer );
 
 extern GLboolean
 _swrast_CreateContext( GLcontext *ctx );