Implemented support for software-based AUX color buffers.

Only available with Xlib driver for now.
Assorted clean-ups related to Draw/ReadBuffer().
Renamed FRONT_LEFT_BIT -> DD_FRONT_LEFT_BIT, etc.

8 files changed, 110 insertions, 113 deletions

diff --git a/src/mesa/main/blend.c b/src/mesa/main/blend.c
index 6741238aae..fde542c4b9 100644
--- a/src/mesa/main/blend.c
+++ b/src/mesa/main/blend.c
@@ -5,9 +5,9 @@
 
 /*
  * Mesa 3-D graphics library
- * Version:  4.1
+ * Version:  6.1
  *
- * Copyright (C) 1999-2002  Brian Paul   All Rights Reserved.
+ * 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"),
@@ -532,7 +532,7 @@ _mesa_ColorMask( GLboolean red, GLboolean green,
 /*@{*/
 
 /**
- * Initialization of the context color data.
+ * Initialization of the context's Color attribute group.
  *
  * \param ctx GL context.
  *
@@ -569,11 +569,11 @@ void _mesa_init_color( GLcontext * ctx )
 
    if (ctx->Visual.doubleBufferMode) {
       ctx->Color.DrawBuffer = GL_BACK;
-      ctx->Color._DrawDestMask = BACK_LEFT_BIT;
+      ctx->Color._DrawDestMask = DD_BACK_LEFT_BIT;
    }
    else {
       ctx->Color.DrawBuffer = GL_FRONT;
-      ctx->Color._DrawDestMask = FRONT_LEFT_BIT;
+      ctx->Color._DrawDestMask = DD_FRONT_LEFT_BIT;
    }
 }
 
diff --git a/src/mesa/main/buffers.c b/src/mesa/main/buffers.c
index 30fa433280..488125c4db 100644
--- a/src/mesa/main/buffers.c
+++ b/src/mesa/main/buffers.c
@@ -5,7 +5,7 @@
 
 /*
  * Mesa 3-D graphics library
- * Version:  6.0.1
+ * Version:  6.1
  *
  * Copyright (C) 1999-2004  Brian Paul   All Rights Reserved.
  *
@@ -192,9 +192,9 @@ _mesa_DrawBuffer( GLenum mode )
       case GL_FRONT:
          /* never an error */
          if (ctx->Visual.stereoMode)
-            ctx->Color._DrawDestMask = FRONT_LEFT_BIT | FRONT_RIGHT_BIT;
+            ctx->Color._DrawDestMask = DD_FRONT_LEFT_BIT | DD_FRONT_RIGHT_BIT;
          else
-            ctx->Color._DrawDestMask = FRONT_LEFT_BIT;
+            ctx->Color._DrawDestMask = DD_FRONT_LEFT_BIT;
          break;
       case GL_BACK:
          if (!ctx->Visual.doubleBufferMode) {
@@ -202,9 +202,9 @@ _mesa_DrawBuffer( GLenum mode )
             return;
          }
          if (ctx->Visual.stereoMode)
-            ctx->Color._DrawDestMask = BACK_LEFT_BIT | BACK_RIGHT_BIT;
+            ctx->Color._DrawDestMask = DD_BACK_LEFT_BIT | DD_BACK_RIGHT_BIT;
          else
-            ctx->Color._DrawDestMask = BACK_LEFT_BIT;
+            ctx->Color._DrawDestMask = DD_BACK_LEFT_BIT;
          break;
       case GL_NONE:
          /* never an error */
@@ -216,30 +216,30 @@ _mesa_DrawBuffer( GLenum mode )
             _mesa_error(ctx, GL_INVALID_OPERATION, "glDrawBuffer(GL_RIGHT)");
             return;}
          if (ctx->Visual.doubleBufferMode)
-            ctx->Color._DrawDestMask = FRONT_RIGHT_BIT | BACK_RIGHT_BIT;
+            ctx->Color._DrawDestMask = DD_FRONT_RIGHT_BIT | DD_BACK_RIGHT_BIT;
          else
-            ctx->Color._DrawDestMask = FRONT_RIGHT_BIT;
+            ctx->Color._DrawDestMask = DD_FRONT_RIGHT_BIT;
          break;
       case GL_FRONT_RIGHT:
          if (!ctx->Visual.stereoMode) {
             _mesa_error(ctx, GL_INVALID_OPERATION, "glDrawBuffer(GL_FRONT_RIGHT)");
             return;
          }
-         ctx->Color._DrawDestMask = FRONT_RIGHT_BIT;
+         ctx->Color._DrawDestMask = DD_FRONT_RIGHT_BIT;
          break;
       case GL_BACK_RIGHT:
          if (!ctx->Visual.stereoMode || !ctx->Visual.doubleBufferMode) {
             _mesa_error(ctx, GL_INVALID_OPERATION, "glDrawBuffer(GL_BACK_RIGHT)");
             return;
          }
-         ctx->Color._DrawDestMask = BACK_RIGHT_BIT;
+         ctx->Color._DrawDestMask = DD_BACK_RIGHT_BIT;
          break;
       case GL_BACK_LEFT:
          if (!ctx->Visual.doubleBufferMode) {
             _mesa_error(ctx, GL_INVALID_OPERATION, "glDrawBuffer(GL_BACK_LEFT)");
             return;
          }
-         ctx->Color._DrawDestMask = BACK_LEFT_BIT;
+         ctx->Color._DrawDestMask = DD_BACK_LEFT_BIT;
          break;
       case GL_FRONT_AND_BACK:
          if (!ctx->Visual.doubleBufferMode) {
@@ -247,25 +247,25 @@ _mesa_DrawBuffer( GLenum mode )
             return;
          }
          if (ctx->Visual.stereoMode)
-            ctx->Color._DrawDestMask = FRONT_LEFT_BIT | BACK_LEFT_BIT
-                                    | FRONT_RIGHT_BIT | BACK_RIGHT_BIT;
+            ctx->Color._DrawDestMask = DD_FRONT_LEFT_BIT | DD_BACK_LEFT_BIT
+                                    | DD_FRONT_RIGHT_BIT | DD_BACK_RIGHT_BIT;
          else
-            ctx->Color._DrawDestMask = FRONT_LEFT_BIT | BACK_LEFT_BIT;
+            ctx->Color._DrawDestMask = DD_FRONT_LEFT_BIT | DD_BACK_LEFT_BIT;
          break;
       case GL_LEFT:
          /* never an error */
          if (ctx->Visual.doubleBufferMode)
-            ctx->Color._DrawDestMask = FRONT_LEFT_BIT | BACK_LEFT_BIT;
+            ctx->Color._DrawDestMask = DD_FRONT_LEFT_BIT | DD_BACK_LEFT_BIT;
          else
-            ctx->Color._DrawDestMask = FRONT_LEFT_BIT;
+            ctx->Color._DrawDestMask = DD_FRONT_LEFT_BIT;
          break;
       case GL_FRONT_LEFT:
          /* never an error */
-         ctx->Color._DrawDestMask = FRONT_LEFT_BIT;
+         ctx->Color._DrawDestMask = DD_FRONT_LEFT_BIT;
          break;
       case GL_AUX0:
-         if (ctx->Const.NumAuxBuffers >= 1) {
-            ctx->Color._DrawDestMask = AUX0_BIT;
+         if (ctx->Visual.numAuxBuffers >= 1) {
+            ctx->Color._DrawDestMask = DD_AUX0_BIT;
          }
          else {
             _mesa_error( ctx, GL_INVALID_OPERATION, "glDrawBuffer(GL_AUX0)" );
@@ -273,8 +273,8 @@ _mesa_DrawBuffer( GLenum mode )
          }
          break;
       case GL_AUX1:
-         if (ctx->Const.NumAuxBuffers >= 2) {
-            ctx->Color._DrawDestMask = AUX1_BIT;
+         if (ctx->Visual.numAuxBuffers >= 2) {
+            ctx->Color._DrawDestMask = DD_AUX1_BIT;
          }
          else {
             _mesa_error( ctx, GL_INVALID_OPERATION, "glDrawBuffer(GL_AUX1)" );
@@ -282,8 +282,8 @@ _mesa_DrawBuffer( GLenum mode )
          }
          break;
       case GL_AUX2:
-         if (ctx->Const.NumAuxBuffers >= 3) {
-            ctx->Color._DrawDestMask = AUX2_BIT;
+         if (ctx->Visual.numAuxBuffers >= 3) {
+            ctx->Color._DrawDestMask = DD_AUX2_BIT;
          }
          else {
             _mesa_error( ctx, GL_INVALID_OPERATION, "glDrawBuffer(GL_AUX2)" );
@@ -291,8 +291,8 @@ _mesa_DrawBuffer( GLenum mode )
          }
          break;
       case GL_AUX3:
-         if (ctx->Const.NumAuxBuffers >= 4) {
-            ctx->Color._DrawDestMask = AUX3_BIT;
+         if (ctx->Visual.numAuxBuffers >= 4) {
+            ctx->Color._DrawDestMask = DD_AUX3_BIT;
          }
          else {
             _mesa_error( ctx, GL_INVALID_OPERATION, "glDrawBuffer(GL_AUX3)" );
@@ -344,7 +344,7 @@ _mesa_ReadBuffer( GLenum mode )
       case GL_FRONT:
       case GL_FRONT_LEFT:
          /* Front-Left buffer, always exists */
-         ctx->Pixel._ReadSrcMask = FRONT_LEFT_BIT;
+         ctx->Pixel._ReadSrcMask = DD_FRONT_LEFT_BIT;
          break;
       case GL_BACK:
       case GL_BACK_LEFT:
@@ -353,7 +353,7 @@ _mesa_ReadBuffer( GLenum mode )
             _mesa_error( ctx, GL_INVALID_OPERATION, "glReadBuffer" );
             return;
          }
-         ctx->Pixel._ReadSrcMask = BACK_LEFT_BIT;
+         ctx->Pixel._ReadSrcMask = DD_BACK_LEFT_BIT;
          break;
 #if _HAVE_FULL_GL
       case GL_FRONT_RIGHT:
@@ -362,18 +362,18 @@ _mesa_ReadBuffer( GLenum mode )
             _mesa_error( ctx, GL_INVALID_OPERATION, "glReadBuffer" );
             return;
          }
-         ctx->Pixel._ReadSrcMask = FRONT_RIGHT_BIT;
+         ctx->Pixel._ReadSrcMask = DD_FRONT_RIGHT_BIT;
          break;
       case GL_BACK_RIGHT:
          if (!ctx->Visual.stereoMode || !ctx->Visual.doubleBufferMode) {
             _mesa_error( ctx, GL_INVALID_OPERATION, "glReadBuffer" );
             return;
          }
-         ctx->Pixel._ReadSrcMask = BACK_RIGHT_BIT;
+         ctx->Pixel._ReadSrcMask = DD_BACK_RIGHT_BIT;
          break;
       case GL_AUX0:
-         if (ctx->Const.NumAuxBuffers >= 1) {
-            ctx->Pixel._ReadSrcMask = AUX0_BIT;
+         if (ctx->Visual.numAuxBuffers >= 1) {
+            ctx->Pixel._ReadSrcMask = DD_AUX0_BIT;
          }
          else {
             _mesa_error( ctx, GL_INVALID_OPERATION, "glReadBuffer(GL_AUX0)" );
@@ -381,8 +381,8 @@ _mesa_ReadBuffer( GLenum mode )
          }
          break;
       case GL_AUX1:
-         if (ctx->Const.NumAuxBuffers >= 2) {
-            ctx->Pixel._ReadSrcMask = AUX1_BIT;
+         if (ctx->Visual.numAuxBuffers >= 2) {
+            ctx->Pixel._ReadSrcMask = DD_AUX1_BIT;
          }
          else {
             _mesa_error( ctx, GL_INVALID_OPERATION, "glReadBuffer(GL_AUX1)" );
@@ -390,8 +390,8 @@ _mesa_ReadBuffer( GLenum mode )
          }
          break;
       case GL_AUX2:
-         if (ctx->Const.NumAuxBuffers >= 3) {
-            ctx->Pixel._ReadSrcMask = AUX2_BIT;
+         if (ctx->Visual.numAuxBuffers >= 3) {
+            ctx->Pixel._ReadSrcMask = DD_AUX2_BIT;
          }
          else {
             _mesa_error( ctx, GL_INVALID_OPERATION, "glReadBuffer(GL_AUX2)" );
@@ -399,8 +399,8 @@ _mesa_ReadBuffer( GLenum mode )
          }
          break;
       case GL_AUX3:
-         if (ctx->Const.NumAuxBuffers >= 4) {
-            ctx->Pixel._ReadSrcMask = AUX3_BIT;
+         if (ctx->Visual.numAuxBuffers >= 4) {
+            ctx->Pixel._ReadSrcMask = DD_AUX3_BIT;
          }
          else {
             _mesa_error( ctx, GL_INVALID_OPERATION, "glReadBuffer(GL_AUX3)" );
diff --git a/src/mesa/main/config.h b/src/mesa/main/config.h
index 74ebb469af..20206482c9 100644
--- a/src/mesa/main/config.h
+++ b/src/mesa/main/config.h
@@ -71,8 +71,8 @@
 /** Maximum pixel map lookup table size */
 #define MAX_PIXEL_MAP_TABLE 256
 
-/** Number of auxillary color buffers */
-#define NUM_AUX_BUFFERS 0
+/** Maximum Number of auxillary color buffers */
+#define MAX_AUX_BUFFERS 4
 
 /** Maximum order (degree) of curves */
 #ifdef AMIGA
diff --git a/src/mesa/main/context.c b/src/mesa/main/context.c
index 951763642b..2328b3726e 100644
--- a/src/mesa/main/context.c
+++ b/src/mesa/main/context.c
@@ -418,7 +418,8 @@ __glCoreNopDispatch(void)
 /*@{*/
 
 /**
- * Allocate a new GLvisual object.
+ * Allocates a GLvisual structure and initializes it via
+ * _mesa_initialize_visual().
  * 
  * \param rgbFlag GL_TRUE for RGB(A) mode, GL_FALSE for Color Index mode.
  * \param dbFlag double buffering
@@ -439,8 +440,7 @@ __glCoreNopDispatch(void)
  * \return pointer to new GLvisual or NULL if requested parameters can't be
  * met.
  *
- * Allocates a GLvisual structure and initializes it via
- * _mesa_initialize_visual().
+ * \note Need to add params for level and numAuxBuffers (at least)
  */
 GLvisual *
 _mesa_create_visual( GLboolean rgbFlag,
@@ -475,14 +475,14 @@ _mesa_create_visual( GLboolean rgbFlag,
 }
 
 /**
- * Initialize the fields of the given GLvisual.
+ * Makes some sanity checks and fills in the fields of the
+ * GLvisual structure with the given parameters.
  * 
  * \return GL_TRUE on success, or GL_FALSE on failure.
  *
  * \sa _mesa_create_visual() above for the parameter description.
  *
- * Makes some sanity checks and fills in the fields of the
- * GLvisual structure with the given parameters.
+ * \note Need to add params for level and numAuxBuffers (at least)
  */
 GLboolean
 _mesa_initialize_visual( GLvisual *vis,
@@ -502,8 +502,6 @@ _mesa_initialize_visual( GLvisual *vis,
                          GLint accumAlphaBits,
                          GLint numSamples )
 {
-   (void) numSamples;
-
    assert(vis);
 
    /* This is to catch bad values from device drivers not updated for
@@ -555,12 +553,14 @@ _mesa_initialize_visual( GLvisual *vis,
    vis->numAuxBuffers = 0;
    vis->level = 0;
    vis->pixmapMode = 0;
+   vis->samples = numSamples;
 
    return GL_TRUE;
 }
 
+
 /**
- * Destroy a visual.
+ * Destroy a visual and free its memory.
  *
  * \param vis visual.
  * 
@@ -581,7 +581,8 @@ _mesa_destroy_visual( GLvisual *vis )
 /*@{*/
 
 /**
- * Create a new framebuffer.  
+ * Allocate a GLframebuffer structure and initializes it via
+ * _mesa_initialize_framebuffer().
  *
  * A GLframebuffer is a structure which encapsulates the depth, stencil and
  * accum buffers and related parameters.
@@ -594,8 +595,7 @@ _mesa_destroy_visual( GLvisual *vis )
  *
  * \return pointer to new GLframebuffer struct or NULL if error.
  *
- * Allocate a GLframebuffer structure and initializes it via
- * _mesa_initialize_framebuffer().
+ * \note Need to add softwareAuxBuffers parameter.
  */
 GLframebuffer *
 _mesa_create_framebuffer( const GLvisual *visual,
@@ -614,13 +614,12 @@ _mesa_create_framebuffer( const GLvisual *visual,
    return buffer;
 }
 
+
 /**
- * Initialize a GLframebuffer object.
- * 
- * \sa _mesa_create_framebuffer() above for the parameter description.
- *
  * Makes some sanity checks and fills in the fields of the
  * GLframebuffer structure with the given parameters.
+ * 
+ * \sa _mesa_create_framebuffer() above for the parameter description.
  */
 void
 _mesa_initialize_framebuffer( GLframebuffer *buffer,
@@ -630,6 +629,7 @@ _mesa_initialize_framebuffer( GLframebuffer *buffer,
                               GLboolean softwareAccum,
                               GLboolean softwareAlpha )
 {
+   GLboolean softwareAux = GL_FALSE;
    assert(buffer);
    assert(visual);
 
@@ -658,8 +658,10 @@ _mesa_initialize_framebuffer( GLframebuffer *buffer,
    buffer->UseSoftwareStencilBuffer = softwareStencil;
    buffer->UseSoftwareAccumBuffer = softwareAccum;
    buffer->UseSoftwareAlphaBuffers = softwareAlpha;
+   buffer->UseSoftwareAuxBuffers = softwareAux;
 }
 
+
 /**
  * Free a framebuffer struct and its buffers.
  *
@@ -674,6 +676,7 @@ _mesa_destroy_framebuffer( GLframebuffer *buffer )
    }
 }
 
+
 /**
  * Free the data hanging off of \p buffer, but not \p buffer itself.
  *
@@ -757,11 +760,11 @@ one_time_init( GLcontext *ctx )
 
       /* do some implementation tests */
       assert( sizeof(GLbyte) == 1 );
-      assert( sizeof(GLshort) >= 2 );
-      assert( sizeof(GLint) >= 4 );
       assert( sizeof(GLubyte) == 1 );
-      assert( sizeof(GLushort) >= 2 );
-      assert( sizeof(GLuint) >= 4 );
+      assert( sizeof(GLshort) == 2 );
+      assert( sizeof(GLushort) == 2 );
+      assert( sizeof(GLint) == 4 );
+      assert( sizeof(GLuint) == 4 );
 
       _mesa_init_lists();
 
@@ -799,15 +802,15 @@ one_time_init( GLcontext *ctx )
    _glthread_UNLOCK_MUTEX(OneTimeLock);
 }
 
+
 /**
  * Allocate and initialize a shared context state structure.
- *
- * \return pointer to a gl_shared_state structure on success, or NULL on
- * failure.
- *
  * Initializes the display list, texture objects and vertex programs hash
  * tables, allocates the texture objects. If it runs out of memory, frees
  * everything already allocated before returning NULL.
+ *
+ * \return pointer to a gl_shared_state structure on success, or NULL on
+ * failure.
  */
 static GLboolean
 alloc_shared_state( GLcontext *ctx )
@@ -1033,7 +1036,6 @@ _mesa_init_constants( GLcontext *ctx )
    ctx->Const.MinLineWidthAA = MIN_LINE_WIDTH;
    ctx->Const.MaxLineWidthAA = MAX_LINE_WIDTH;
    ctx->Const.LineWidthGranularity = (GLfloat) LINE_WIDTH_GRANULARITY;
-   ctx->Const.NumAuxBuffers = NUM_AUX_BUFFERS;
    ctx->Const.MaxColorTableSize = MAX_COLOR_TABLE_SIZE;
    ctx->Const.MaxConvolutionWidth = MAX_CONVOLUTION_WIDTH;
    ctx->Const.MaxConvolutionHeight = MAX_CONVOLUTION_HEIGHT;
diff --git a/src/mesa/main/dd.h b/src/mesa/main/dd.h
index f1b49b7a30..b2b0bbd237 100644
--- a/src/mesa/main/dd.h
+++ b/src/mesa/main/dd.h
@@ -5,9 +5,9 @@
 
 /*
  * Mesa 3-D graphics library
- * Version:  4.1
+ * Version:  6.1
  *
- * Copyright (C) 1999-2002  Brian Paul   All Rights Reserved.
+ * 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"),
@@ -35,20 +35,6 @@
 
 struct gl_pixelstore_attrib;
 
-/* Mask bits sent to the driver Clear() function */
-#define DD_FRONT_LEFT_BIT  FRONT_LEFT_BIT         /* 1 */
-#define DD_FRONT_RIGHT_BIT FRONT_RIGHT_BIT        /* 2 */
-#define DD_BACK_LEFT_BIT   BACK_LEFT_BIT          /* 4 */
-#define DD_BACK_RIGHT_BIT  BACK_RIGHT_BIT         /* 8 */
-#define DD_AUX0            AUX0_BIT               /* future use */
-#define DD_AUX1            AUX1_BIT               /* future use */
-#define DD_AUX2            AUX2_BIT               /* future use */
-#define DD_AUX3            AUX3_BIT               /* future use */
-#define DD_DEPTH_BIT       GL_DEPTH_BUFFER_BIT    /* 0x00000100 */
-#define DD_ACCUM_BIT       GL_ACCUM_BUFFER_BIT    /* 0x00000200 */
-#define DD_STENCIL_BIT     GL_STENCIL_BUFFER_BIT  /* 0x00000400 */
-
-
 /**
  * Device driver function table.
  * Core Mesa uses these function pointers to call into device drivers.
@@ -629,7 +615,7 @@ struct dd_function_table {
    void (*DepthFunc)(GLcontext *ctx, GLenum func);
    /** Enable or disable writing into the depth buffer */
    void (*DepthMask)(GLcontext *ctx, GLboolean flag);
-   /** Specify mapping of depth values from normalized device coordinates to window coordinates */
+   /** Specify mapping of depth values from NDC to window coordinates */
    void (*DepthRange)(GLcontext *ctx, GLclampd nearval, GLclampd farval);
    /** Specify the current buffer for writing */
    void (*DrawBuffer)( GLcontext *ctx, GLenum buffer );
diff --git a/src/mesa/main/get.c b/src/mesa/main/get.c
index fac3f072bc..e4e60abe7e 100644
--- a/src/mesa/main/get.c
+++ b/src/mesa/main/get.c
@@ -5,7 +5,7 @@
 
 /*
  * Mesa 3-D graphics library
- * Version:  6.0
+ * Version:  6.1
  *
  * Copyright (C) 1999-2004  Brian Paul   All Rights Reserved.
  *
@@ -212,7 +212,7 @@ _mesa_GetBooleanv( GLenum pname, GLboolean *params )
          *params = ctx->Eval.AutoNormal;
          break;
       case GL_AUX_BUFFERS:
-         *params = (ctx->Const.NumAuxBuffers) ? GL_TRUE : GL_FALSE;
+         *params = (ctx->Visual.numAuxBuffers) ? GL_TRUE : GL_FALSE;
          break;
       case GL_BLEND:
          *params = ctx->Color.BlendEnabled;
@@ -1767,7 +1767,7 @@ _mesa_GetDoublev( GLenum pname, GLdouble *params )
          *params = (GLdouble) ctx->Eval.AutoNormal;
          break;
       case GL_AUX_BUFFERS:
-         *params = (GLdouble) ctx->Const.NumAuxBuffers;
+         *params = (GLdouble) ctx->Visual.numAuxBuffers;
          break;
       case GL_BLEND:
          *params = (GLdouble) ctx->Color.BlendEnabled;
@@ -3317,7 +3317,7 @@ _mesa_GetFloatv( GLenum pname, GLfloat *params )
          *params = (GLfloat) ctx->Eval.AutoNormal;
          break;
       case GL_AUX_BUFFERS:
-         *params = (GLfloat) ctx->Const.NumAuxBuffers;
+         *params = (GLfloat) ctx->Visual.numAuxBuffers;
          break;
       case GL_BLEND:
          *params = (GLfloat) ctx->Color.BlendEnabled;
@@ -4844,7 +4844,7 @@ _mesa_GetIntegerv( GLenum pname, GLint *params )
          *params = (GLint) ctx->Eval.AutoNormal;
          break;
       case GL_AUX_BUFFERS:
-         *params = (GLint) ctx->Const.NumAuxBuffers;
+         *params = (GLint) ctx->Visual.numAuxBuffers;
          break;
       case GL_BLEND:
          *params = (GLint) ctx->Color.BlendEnabled;
diff --git a/src/mesa/main/mtypes.h b/src/mesa/main/mtypes.h
index 0dcf54baf7..b74eeaccca 100644
--- a/src/mesa/main/mtypes.h
+++ b/src/mesa/main/mtypes.h
@@ -236,6 +236,27 @@ enum {
 			   FRAG_BIT_TEX7)
 
 
+/**
+ * Bits for each basic buffer in a complete framebuffer.
+ * When glDrawBuffer(GL_FRONT_AND_BACK) is called (non-stereo),
+ * _DrawDestMask will be set to (DD_FRONT_LEFT_BIT | DD_BACK_LEFT_BIT),
+ * for example.  Also passed to ctx->Driver.Clear() to indicate which
+ * buffers to clear.
+ */
+/*@{*/
+#define DD_FRONT_LEFT_BIT  0x1
+#define DD_FRONT_RIGHT_BIT 0x2
+#define DD_BACK_LEFT_BIT   0x4
+#define DD_BACK_RIGHT_BIT  0x8
+#define DD_AUX0_BIT        0x10
+#define DD_AUX1_BIT        0x20
+#define DD_AUX2_BIT        0x40
+#define DD_AUX3_BIT        0x80
+#define DD_DEPTH_BIT       GL_DEPTH_BUFFER_BIT    /* 0x00000100 */
+#define DD_ACCUM_BIT       GL_ACCUM_BUFFER_BIT    /* 0x00000200 */
+#define DD_STENCIL_BIT     GL_STENCIL_BUFFER_BIT  /* 0x00000400 */
+/*@}*/
+
 
 /**
  * Maximum number of temporary vertices required for clipping.  
@@ -410,24 +431,6 @@ struct gl_accum_attrib {
 
 
 /**
- * \name Clipping planes bits
- * 
- * Used in gl_colorbuffer_attrib::_DrawDestMask and
- * gl_colorbuffer_attrib::_ReadSrcMask below to identify color buffers.
- */
-/*@{*/
-#define FRONT_LEFT_BIT  0x1
-#define FRONT_RIGHT_BIT 0x2
-#define BACK_LEFT_BIT   0x4
-#define BACK_RIGHT_BIT  0x8
-#define AUX0_BIT        0x10
-#define AUX1_BIT        0x20
-#define AUX2_BIT        0x40
-#define AUX3_BIT        0x80
-/*@}*/
-
-
-/**
  * Color buffers attributes.
  */
 struct gl_colorbuffer_attrib {
@@ -438,7 +441,7 @@ struct gl_colorbuffer_attrib {
    GLubyte ColorMask[4];		/**< Each flag is 0xff or 0x0 */
 
    GLenum DrawBuffer;			/**< Which buffer to draw into */
-   GLubyte _DrawDestMask;		/**< bitwise-OR of FRONT/BACK_LEFT/RIGHT_BITs */
+   GLbitfield _DrawDestMask;		/**< bitmask of DD_*_BIT bits */
 
    /** 
     * \name alpha testing
@@ -1709,6 +1712,7 @@ struct gl_frame_buffer
    GLboolean UseSoftwareAccumBuffer;
    GLboolean UseSoftwareStencilBuffer;
    GLboolean UseSoftwareAlphaBuffers;
+   GLboolean UseSoftwareAuxBuffers;
 
    /** \name Software depth (aka Z) buffer */
    /*@{*/
@@ -1733,6 +1737,8 @@ struct gl_frame_buffer
    GLchan *BackRightAlpha;	/**< array [Width*Height] of GLchan */
    /*@}*/
 
+   GLchan *AuxBuffers[MAX_AUX_BUFFERS];
+
    /** 
     * \name Drawing bounds
     *
@@ -1770,7 +1776,6 @@ struct gl_constants
    GLfloat MinLineWidth, MaxLineWidth;		/* aliased */
    GLfloat MinLineWidthAA, MaxLineWidthAA;	/* antialiased */
    GLfloat LineWidthGranularity;
-   GLuint NumAuxBuffers;
    GLuint MaxColorTableSize;
    GLuint MaxConvolutionWidth;
    GLuint MaxConvolutionHeight;
diff --git a/src/mesa/main/pixel.c b/src/mesa/main/pixel.c
index 8e2b55fc34..c4fa17f22f 100644
--- a/src/mesa/main/pixel.c
+++ b/src/mesa/main/pixel.c
@@ -1683,8 +1683,12 @@ void _mesa_update_pixel( GLcontext *ctx, GLuint new_state )
 /*****                      Initialization                        *****/
 /**********************************************************************/
 
+
+/**
+ * Initialize the context's PIXEL attribute group.
+ */
 void
-_mesa_init_pixel( GLcontext * ctx )
+_mesa_init_pixel( GLcontext *ctx )
 {
    int i;
 
@@ -1815,11 +1819,11 @@ _mesa_init_pixel( GLcontext * ctx )
 
    if (ctx->Visual.doubleBufferMode) {
       ctx->Pixel.ReadBuffer = GL_BACK;
-      ctx->Pixel._ReadSrcMask = BACK_LEFT_BIT;
+      ctx->Pixel._ReadSrcMask = DD_BACK_LEFT_BIT;
    }
    else {
       ctx->Pixel.ReadBuffer = GL_FRONT;
-      ctx->Pixel._ReadSrcMask = FRONT_LEFT_BIT;
+      ctx->Pixel._ReadSrcMask = DD_FRONT_LEFT_BIT;
    }
 
    /* Miscellaneous */