updated for Mesa 3.3

8 files changed, 295 insertions, 162 deletions

diff --git a/src/mesa/drivers/svga/svgamesa.c b/src/mesa/drivers/svga/svgamesa.c
index 4e726fa48d3..f7175fe63e8 100644
--- a/src/mesa/drivers/svga/svgamesa.c
+++ b/src/mesa/drivers/svga/svgamesa.c
@@ -1,8 +1,8 @@
-/* $Id: svgamesa.c,v 1.3 2000/01/23 17:49:54 brianp Exp $ */
+/* $Id: svgamesa.c,v 1.4 2000/01/25 00:03:02 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
- * Version:  3.2
+ * Version:  3.3
  * Copyright (C) 1995-2000  Brian Paul
  *
  * This library is free software; you can redistribute it and/or
@@ -162,28 +162,33 @@ int SVGAMesaInit( int GraphMode )
    SVGAlog(cbuf);
    sprintf(cbuf,"SVGAMesaInit: done. (Mode %d)",GraphMode);
    SVGAlog(cbuf);
-#endif    
+#endif
+
+   SVGABuffer.DrawBuffer = SVGABuffer.BackBuffer;
+   SVGABuffer.ReadBuffer = SVGABuffer.BackBuffer;
+
    return 0;
 }   
 
 int SVGAMesaClose( void )
 {  
- vga_setmode(TEXT); 
- free(SVGABuffer.FrontBuffer);
- free(SVGABuffer.BackBuffer);
- return 0;
+   vga_setmode(TEXT); 
+   free(SVGABuffer.FrontBuffer);
+   free(SVGABuffer.BackBuffer);
+   return 0;
 }
 
 void SVGAMesaSetCI(int ndx, GLubyte red, GLubyte green, GLubyte blue)
 {
- if (ndx<256) vga_setpalette(ndx, red>>2, green>>2, blue>>2);
+   if (ndx<256)
+      vga_setpalette(ndx, red>>2, green>>2, blue>>2);
 }
 
 /**********************************************************************/
 /*****                 Miscellaneous functions                    *****/
 /**********************************************************************/
 
-static void copy_buffer( GLubyte * buffer) {
+static void copy_buffer( const GLubyte * buffer) {
  int size = SVGABuffer.BufferSize, page = 0;
 
 #ifdef SVGA_DEBUG
@@ -209,29 +214,61 @@ static void get_buffer_size( GLcontext *ctx, GLuint *width, GLuint *height )
    *height = SVGAMesa->height = vga_getydim();
 }
 
-static GLboolean set_buffer( GLcontext *ctx, GLenum buffer )
+static GLboolean set_draw_buffer( GLcontext *ctx, GLenum buffer )
 {
- void * tmpptr;
- 
-   if (buffer == GL_FRONT_LEFT)
-   {
-/*    vga_waitretrace(); */
-    copy_buffer(SVGABuffer.FrontBuffer);
-    tmpptr=SVGABuffer.BackBuffer;
-    SVGABuffer.BackBuffer=SVGABuffer.FrontBuffer;
-    SVGABuffer.FrontBuffer=tmpptr;
-    return GL_TRUE;
-   }    
-   else if (buffer == GL_BACK_LEFT)
-   {
-/*    vga_waitretrace(); */
-    copy_buffer(SVGABuffer.BackBuffer);
-    return GL_TRUE;
+   if (buffer == GL_FRONT_LEFT) {
+      SVGABuffer.DrawBuffer = SVGABuffer.FrontBuffer;
+#if 0
+      /*    vga_waitretrace(); */
+      void * tmpptr;
+      copy_buffer(SVGABuffer.FrontBuffer);
+      tmpptr=SVGABuffer.BackBuffer;
+      SVGABuffer.BackBuffer=SVGABuffer.FrontBuffer;
+      SVGABuffer.FrontBuffer=tmpptr;
+#endif
+      return GL_TRUE;
    }    
+   else if (buffer == GL_BACK_LEFT) {
+      SVGABuffer.DrawBuffer = SVGABuffer.BackBuffer;
+#if 0
+      /*    vga_waitretrace(); */
+      copy_buffer(SVGABuffer.BackBuffer);
+#endif
+      return GL_TRUE;
+   }
    else
       return GL_FALSE;
 }
 
+
+static void set_read_buffer( GLcontext *ctx, GLframebuffer *colorBuffer,
+                             GLenum buffer )
+{
+   /* We can ignore colorBuffer since we don't support a MakeCurrentRead()
+    * function.
+    */
+   (void) colorBuffer;
+
+   if (buffer == GL_FRONT_LEFT) {
+      SVGABuffer.ReadBuffer = SVGABuffer.FrontBuffer;
+#if 0
+      void * tmpptr;
+      /*    vga_waitretrace(); */
+      copy_buffer(SVGABuffer.FrontBuffer);
+      tmpptr=SVGABuffer.BackBuffer;
+      SVGABuffer.BackBuffer=SVGABuffer.FrontBuffer;
+      SVGABuffer.FrontBuffer=tmpptr;
+#endif
+   }
+   else if (buffer == GL_BACK_LEFT) {
+      SVGABuffer.ReadBuffer = SVGABuffer.BackBuffer;
+#if 0
+      /*    vga_waitretrace(); */
+      copy_buffer(SVGABuffer.BackBuffer);
+#endif
+   }
+}
+
 /**********************************************************************/
 /*****                                                            *****/
 /**********************************************************************/
@@ -243,8 +280,9 @@ static void svgamesa_update_state( GLcontext *ctx )
 
    ctx->Driver.UpdateState = svgamesa_update_state;
 
-   ctx->Driver.SetBuffer = set_buffer;
    ctx->Driver.GetBufferSize = get_buffer_size;
+   ctx->Driver.SetDrawBuffer = set_draw_buffer;
+   ctx->Driver.SetReadBuffer = set_read_buffer;
 
    ctx->Driver.PointsFunc = NULL;
    ctx->Driver.LineFunc = NULL;
@@ -385,7 +423,11 @@ SVGAMesaContext SVGAMesaCreateContext( GLboolean doubleBuffer )
                                     NULL,  /* share list context */
                                     (void *) ctx, GL_TRUE );
 
-   ctx->gl_buffer = gl_create_framebuffer( ctx->gl_vis );
+   ctx->gl_buffer = gl_create_framebuffer( ctx->gl_vis,
+                                           ctx->gl_vis->DepthBits > 0,
+                                           ctx->gl_vis->StencilBits > 0,
+                                           ctx->gl_vis->AccumBits > 0,
+                                           ctx->gl_vis->AlphaBits > 0 );
 
    ctx->index = 1;
    ctx->red = ctx->green = ctx->blue = 255;
@@ -445,10 +487,12 @@ SVGAMesaContext SVGAMesaGetCurrentContext( void )
  */
 void SVGAMesaSwapBuffers( void )
 {
- void * tmpptr;
- 
-/* vga_waitretrace(); */
- copy_buffer(SVGABuffer.BackBuffer);
+#if 000
+   void * tmpptr;
+#endif
+
+   /* vga_waitretrace(); */
+   copy_buffer(SVGABuffer.BackBuffer);
 
 #ifndef DEV
    FLUSH_VB( SVGAMesa->gl_ctx, "swap buffers" );
@@ -456,19 +500,21 @@ void SVGAMesaSwapBuffers( void )
 #endif /* DEV */   
    {
 #ifdef SVGA_DEBUG
-   sprintf(cbuf,"SVGAMesaSwapBuffers : Swapping...");
-   SVGAlog(cbuf);
+      sprintf(cbuf,"SVGAMesaSwapBuffers : Swapping...");
+      SVGAlog(cbuf);
 #endif /* SVGA_DEBUG */
-   tmpptr=SVGABuffer.BackBuffer;
-   SVGABuffer.BackBuffer=SVGABuffer.FrontBuffer;
-   SVGABuffer.FrontBuffer=tmpptr;
+#if 000
+      tmpptr=SVGABuffer.BackBuffer;
+      SVGABuffer.BackBuffer=SVGABuffer.FrontBuffer;
+      SVGABuffer.FrontBuffer=tmpptr;
+#endif
 #ifdef SVGA_DEBUG
-   sprintf(cbuf,"SVGAMesaSwapBuffers : WriteBuffer : %p\n"
-                "                      Readbuffer  : %p", \
-		SVGABuffer.BackBuffer, SVGABuffer.FrontBuffer );
-   SVGAlog(cbuf);
+      sprintf(cbuf,"SVGAMesaSwapBuffers : WriteBuffer : %p\n"
+              "                      Readbuffer  : %p", \
+              SVGABuffer.BackBuffer, SVGABuffer.FrontBuffer );
+      SVGAlog(cbuf);
 #endif /* SVGA_DEBUG */
-   }       
+   }
 }
 
 #else /*SVGA*/
diff --git a/src/mesa/drivers/svga/svgamesa15.c b/src/mesa/drivers/svga/svgamesa15.c
index 80966d7ca49..bc352878f99 100644
--- a/src/mesa/drivers/svga/svgamesa15.c
+++ b/src/mesa/drivers/svga/svgamesa15.c
@@ -1,8 +1,8 @@
-/* $Id: svgamesa15.c,v 1.3 2000/01/23 17:49:54 brianp Exp $ */
+/* $Id: svgamesa15.c,v 1.4 2000/01/25 00:03:01 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
- * Version:  3.2
+ * Version:  3.3
  * Copyright (C) 1995-2000  Brian Paul
  *
  * This library is free software; you can redistribute it and/or
@@ -30,25 +30,21 @@
 #ifdef SVGA
 
 #include "svgapix.h"
+#include "svgamesa15.h"
 
-GLshort * shortBuffer;
-
-int __svga_drawpixel15(int x, int y, unsigned long c)
+static void __svga_drawpixel15(int x, int y, unsigned long c)
 {
     unsigned long offset;
-    
-    shortBuffer=(void *)SVGABuffer.BackBuffer;
+    GLshort *shortBuffer=(void *)SVGABuffer.DrawBuffer;
     y = SVGAInfo->height-y-1;
     offset = y * SVGAInfo->width + x;
     shortBuffer[offset]=c;
-    return 0;
 }
 
-unsigned long __svga_getpixel15(int x, int y)
+static unsigned long __svga_getpixel15(int x, int y)
 {
     unsigned long offset;
-
-    shortBuffer=(void *)SVGABuffer.BackBuffer;
+    GLshort *shortBuffer=(void *)SVGABuffer.ReadBuffer;
     y = SVGAInfo->height-y-1;
     offset = y * SVGAInfo->width + x;
     return shortBuffer[offset];
@@ -73,19 +69,39 @@ void __clear_color15( GLcontext *ctx,
 GLbitfield __clear15( GLcontext *ctx, GLbitfield mask, GLboolean all,
                       GLint x, GLint y, GLint width, GLint height )
 {
-   int i,j;
-   
-   if (mask & GL_COLOR_BUFFER_BIT) {
-    shortBuffer=(void *)SVGABuffer.BackBuffer;
-    if (all) {
-     for (i=0;i<SVGABuffer.BufferSize / 2;i++) shortBuffer[i]=SVGAMesa->clear_hicolor;
-    } else {
-    for (i=x;i<width;i++)    
-     for (j=y;j<height;j++)    
-      __svga_drawpixel15(i,j,SVGAMesa->clear_hicolor);
-    }	
-   }    
-   return mask & (~GL_COLOR_BUFFER_BIT);
+   int i, j;
+
+   if (mask & DD_FRONT_LEFT_BIT) {
+      GLshort *shortBuffer=(void *)SVGABuffer.FrontBuffer;
+      if (all) {
+         for (i=0;i<SVGABuffer.BufferSize / 2;i++)
+            shortBuffer[i]=SVGAMesa->clear_hicolor;
+      }
+      else {
+         GLubyte *tmp = SVGABuffer.DrawBuffer;
+         SVGABuffer.DrawBuffer = SVGABuffer.FrontBuffer;
+         for (i=x;i<width;i++)
+            for (j=y;j<height;j++)
+               __svga_drawpixel15(i,j,SVGAMesa->clear_hicolor);
+         SVGABuffer.DrawBuffer = tmp;
+      }
+   }
+   if (mask & DD_BACK_LEFT_BIT) {
+      GLshort *shortBuffer=(void *)SVGABuffer.BackBuffer;
+      if (all) {
+         for (i=0;i<SVGABuffer.BufferSize / 2;i++)
+            shortBuffer[i]=SVGAMesa->clear_hicolor;
+      }
+      else {
+         GLubyte *tmp = SVGABuffer.DrawBuffer;
+         SVGABuffer.DrawBuffer = SVGABuffer.BackBuffer;
+         for (i=x;i<width;i++)
+            for (j=y;j<height;j++)
+               __svga_drawpixel15(i,j,SVGAMesa->clear_hicolor);
+         SVGABuffer.DrawBuffer = tmp;
+      }
+   }
+   return mask & (~(DD_FRONT_LEFT_BIT | DD_BACK_LEFT_BIT));
 }
 
 void __write_rgba_span15( const GLcontext *ctx, GLuint n, GLint x, GLint y,
diff --git a/src/mesa/drivers/svga/svgamesa15.h b/src/mesa/drivers/svga/svgamesa15.h
index 498575c5fc2..ad04489f8e1 100644
--- a/src/mesa/drivers/svga/svgamesa15.h
+++ b/src/mesa/drivers/svga/svgamesa15.h
@@ -1,8 +1,8 @@
-/* $Id: svgamesa15.h,v 1.2 2000/01/22 20:08:36 brianp Exp $ */
+/* $Id: svgamesa15.h,v 1.3 2000/01/25 00:03:02 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
- * Version:  3.2
+ * Version:  3.3
  * Copyright (C) 1995-2000  Brian Paul
  *
  * This library is free software; you can redistribute it and/or
diff --git a/src/mesa/drivers/svga/svgamesa16.c b/src/mesa/drivers/svga/svgamesa16.c
index 061f40a9b70..26a36c7d03a 100644
--- a/src/mesa/drivers/svga/svgamesa16.c
+++ b/src/mesa/drivers/svga/svgamesa16.c
@@ -1,8 +1,8 @@
-/* $Id: svgamesa16.c,v 1.3 2000/01/23 17:49:54 brianp Exp $ */
+/* $Id: svgamesa16.c,v 1.4 2000/01/25 00:03:02 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
- * Version:  3.2
+ * Version:  3.3
  * Copyright (C) 1995-2000  Brian Paul
  *
  * This library is free software; you can redistribute it and/or
@@ -30,25 +30,23 @@
 #ifdef SVGA
 
 #include "svgapix.h"
+#include "svgamesa16.h"
 
-GLshort * shortBuffer;
 
-int __svga_drawpixel16(int x, int y, unsigned long c)
+static void __svga_drawpixel16(int x, int y, unsigned long c)
 {
     unsigned long offset;
-
-    shortBuffer=(void *)SVGABuffer.BackBuffer;
+    GLshort *shortBuffer=(void *)SVGABuffer.DrawBuffer;
     y = SVGAInfo->height-y-1;
     offset = y * SVGAInfo->width + x;
     shortBuffer[offset]=c;
-    return 0;
 }
 
-unsigned long __svga_getpixel16(int x, int y)
+static unsigned long __svga_getpixel16(int x, int y)
 {
     unsigned long offset;
 
-    shortBuffer=(void *)SVGABuffer.BackBuffer;
+    GLshort *shortBuffer=(void *)SVGABuffer.ReadBuffer;
     y = SVGAInfo->height-y-1;
     offset = y * SVGAInfo->width + x;
     return shortBuffer[offset];
@@ -74,18 +72,38 @@ GLbitfield __clear16( GLcontext *ctx, GLbitfield mask, GLboolean all,
                       GLint x, GLint y, GLint width, GLint height )
 {
    int i,j;
-   
-   if (mask & GL_COLOR_BUFFER_BIT) {
-    if (all) {
-     shortBuffer=(void *)SVGABuffer.BackBuffer;
-     for (i=0;i<SVGABuffer.BufferSize / 2;i++) shortBuffer[i]=SVGAMesa->clear_hicolor;
-    } else {
-    for (i=x;i<width;i++)    
-     for (j=y;j<height;j++)    
-      __svga_drawpixel16(i,j,SVGAMesa->clear_hicolor);
-    }	
-   }        
-   return mask & (~GL_COLOR_BUFFER_BIT);
+
+   if (mask & DD_FRONT_LEFT_BIT) {
+      if (all) {
+         GLshort *shortBuffer=(void *)SVGABuffer.FrontBuffer;
+         for (i=0;i<SVGABuffer.BufferSize / 2;i++)
+            shortBuffer[i]=SVGAMesa->clear_hicolor;
+      }
+      else {
+         GLubyte *tmp = SVGABuffer.DrawBuffer;
+         SVGABuffer.DrawBuffer = SVGABuffer.FrontBuffer;
+         for (i=x;i<width;i++)    
+            for (j=y;j<height;j++)    
+               __svga_drawpixel16(i,j,SVGAMesa->clear_hicolor);
+         SVGABuffer.DrawBuffer = tmp;
+      }
+   }    
+   if (mask & DD_BACK_LEFT_BIT) {
+      if (all) {
+         GLshort *shortBuffer=(void *)SVGABuffer.BackBuffer;
+         for (i=0;i<SVGABuffer.BufferSize / 2;i++)
+            shortBuffer[i]=SVGAMesa->clear_hicolor;
+      }
+      else {
+         GLubyte *tmp = SVGABuffer.DrawBuffer;
+         SVGABuffer.DrawBuffer = SVGABuffer.BackBuffer;
+         for (i=x;i<width;i++)    
+            for (j=y;j<height;j++)    
+               __svga_drawpixel16(i,j,SVGAMesa->clear_hicolor);
+         SVGABuffer.DrawBuffer = tmp;
+      }
+   }    
+   return mask & (~(DD_FRONT_LEFT_BIT | DD_BACK_LEFT_BIT));
 }
 
 void __write_rgba_span16( const GLcontext *ctx, GLuint n, GLint x, GLint y,
diff --git a/src/mesa/drivers/svga/svgamesa24.c b/src/mesa/drivers/svga/svgamesa24.c
index c4b78079f48..152779bf127 100644
--- a/src/mesa/drivers/svga/svgamesa24.c
+++ b/src/mesa/drivers/svga/svgamesa24.c
@@ -1,8 +1,8 @@
-/* $Id: svgamesa24.c,v 1.3 2000/01/23 17:49:54 brianp Exp $ */
+/* $Id: svgamesa24.c,v 1.4 2000/01/25 00:03:02 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
- * Version:  3.2
+ * Version:  3.3
  * Copyright (C) 1995-2000  Brian Paul
  *
  * This library is free software; you can redistribute it and/or
@@ -30,11 +30,11 @@
 #ifdef SVGA
 
 #include "svgapix.h"
+#include "svgamesa24.h"
 
-_RGB * rgbBuffer;
 
 #if 0
-inline int RGB2BGR24(int c)
+static inline int RGB2BGR24(int c)
 {
 	asm("rorw  $8, %0\n"	 
 	    "rorl $16, %0\n"	 
@@ -44,7 +44,7 @@ inline int RGB2BGR24(int c)
     return c;
 }
 #else
-int RGB2BGR24(int c)
+static int RGB2BGR24(int c)
 {
    /* XXX this isn't right */
    return c;
@@ -53,26 +53,24 @@ int RGB2BGR24(int c)
 
 #endif
 
-int __svga_drawpixel24(int x, int y, GLubyte r, GLubyte g, GLubyte b)
+static void __svga_drawpixel24(int x, int y, GLubyte r, GLubyte g, GLubyte b)
 {
     unsigned long offset;
 
-    rgbBuffer=(void *)SVGABuffer.BackBuffer;
+    _RGB *rgbBuffer=(void *)SVGABuffer.DrawBuffer;
     y = SVGAInfo->height-y-1;
     offset = y * SVGAInfo->width + x;
 
     rgbBuffer[offset].r=r;
     rgbBuffer[offset].g=g;
     rgbBuffer[offset].b=b;
-
-    return 0;
 }
 
-unsigned long __svga_getpixel24(int x, int y)
+static unsigned long __svga_getpixel24(int x, int y)
 {
     unsigned long offset;
 
-    rgbBuffer=(void *)SVGABuffer.BackBuffer;
+    _RGB *rgbBuffer=(void *)SVGABuffer.ReadBuffer;
     y = SVGAInfo->height-y-1;
     offset = y * SVGAInfo->width + x;
     return rgbBuffer[offset].r<<16 | rgbBuffer[offset].g<<8 | rgbBuffer[offset].b;
@@ -103,24 +101,47 @@ GLbitfield __clear24( GLcontext *ctx, GLbitfield mask, GLboolean all,
 {
    int i,j;
    
-   if (mask & GL_COLOR_BUFFER_BIT) {
-    if (all) {
-     rgbBuffer=(void *)SVGABuffer.BackBuffer;
-     for (i=0;i<SVGABuffer.BufferSize / 3;i++)
-      {
-       rgbBuffer[i].r=SVGAMesa->clear_red;
-       rgbBuffer[i].g=SVGAMesa->clear_green;
-       rgbBuffer[i].b=SVGAMesa->clear_blue;
-      } 
-    } else {
-    for (i=x;i<width;i++)    
-     for (j=y;j<height;j++)    
-      __svga_drawpixel24( i, j, SVGAMesa->clear_red,
-                                SVGAMesa->clear_green,
-				SVGAMesa->clear_blue);
-    }	
+   if (mask & DD_FRONT_LEFT_BIT) {
+      if (all) {
+         _RGB *rgbBuffer=(void *)SVGABuffer.FrontBuffer;
+         for (i=0;i<SVGABuffer.BufferSize / 3;i++) {
+            rgbBuffer[i].r=SVGAMesa->clear_red;
+            rgbBuffer[i].g=SVGAMesa->clear_green;
+            rgbBuffer[i].b=SVGAMesa->clear_blue;
+         } 
+      }
+      else {
+         GLubyte *tmp = SVGABuffer.DrawBuffer;
+         SVGABuffer.DrawBuffer = SVGABuffer.FrontBuffer;
+         for (i=x;i<width;i++)    
+            for (j=y;j<height;j++)    
+               __svga_drawpixel24( i, j, SVGAMesa->clear_red,
+                                   SVGAMesa->clear_green,
+                                   SVGAMesa->clear_blue);
+         SVGABuffer.DrawBuffer = tmp;
+      }	
+   }
+   if (mask & DD_BACK_LEFT_BIT) {
+      if (all) {
+         _RGB *rgbBuffer=(void *)SVGABuffer.BackBuffer;
+         for (i=0;i<SVGABuffer.BufferSize / 3;i++) {
+            rgbBuffer[i].r=SVGAMesa->clear_red;
+            rgbBuffer[i].g=SVGAMesa->clear_green;
+            rgbBuffer[i].b=SVGAMesa->clear_blue;
+         } 
+      }
+      else {
+         GLubyte *tmp = SVGABuffer.DrawBuffer;
+         SVGABuffer.DrawBuffer = SVGABuffer.BackBuffer;
+         for (i=x;i<width;i++)    
+            for (j=y;j<height;j++)    
+               __svga_drawpixel24( i, j, SVGAMesa->clear_red,
+                                   SVGAMesa->clear_green,
+                                   SVGAMesa->clear_blue);
+         SVGABuffer.DrawBuffer = tmp;
+      }	
    }
-   return mask & (~GL_COLOR_BUFFER_BIT);
+   return mask & (~(DD_FRONT_LEFT_BIT | DD_BACK_LEFT_BIT));
 }
 
 void __write_rgba_span24( const GLcontext *ctx, GLuint n, GLint x, GLint y,
diff --git a/src/mesa/drivers/svga/svgamesa32.c b/src/mesa/drivers/svga/svgamesa32.c
index a67188f65c6..ad683ef08f6 100644
--- a/src/mesa/drivers/svga/svgamesa32.c
+++ b/src/mesa/drivers/svga/svgamesa32.c
@@ -1,8 +1,8 @@
-/* $Id: svgamesa32.c,v 1.3 2000/01/23 17:49:54 brianp Exp $ */
+/* $Id: svgamesa32.c,v 1.4 2000/01/25 00:03:02 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
- * Version:  3.2
+ * Version:  3.3
  * Copyright (C) 1995-2000  Brian Paul
  *
  * This library is free software; you can redistribute it and/or
@@ -30,11 +30,10 @@
 #ifdef SVGA
 
 #include "svgapix.h"
-
-GLint * intBuffer;
+#include "svgamesa32.h"
 
 #if 0
-inline int RGB2BGR32(int c)
+static inline int RGB2BGR32(int c)
 {
 	asm("rorw  $8, %0\n"	 
 	    "rorl $16, %0\n"	 
@@ -44,29 +43,28 @@ inline int RGB2BGR32(int c)
     return c;
 }
 #else
-int RGB2BGR32(int c)
+static int RGB2BGR32(int c)
 {
    /* XXX this isn't right */
    return c;
 }
 #endif
 
-int __svga_drawpixel32(int x, int y, unsigned long c)
+static void __svga_drawpixel32(int x, int y, unsigned long c)
 {
     unsigned long offset;
 
-    intBuffer=(void *)SVGABuffer.BackBuffer;
+    GLint *intBuffer=(void *)SVGABuffer.DrawBuffer;
     y = SVGAInfo->height-y-1;
     offset = y * SVGAInfo->width + x;
     intBuffer[offset]=c;
-    return 0;
 }
 
-unsigned long __svga_getpixel32(int x, int y)
+static unsigned long __svga_getpixel32(int x, int y)
 {
     unsigned long offset;
 
-    intBuffer=(void *)SVGABuffer.BackBuffer;
+    const GLint *intBuffer=(void *)SVGABuffer.ReadBuffer;
     y = SVGAInfo->height-y-1;
     offset = y * SVGAInfo->width + x;
     return intBuffer[offset];
@@ -94,17 +92,37 @@ GLbitfield __clear32( GLcontext *ctx, GLbitfield mask, GLboolean all,
 {
    int i,j;
    
-   if (mask & GL_COLOR_BUFFER_BIT) {
-    if (all) {
-     intBuffer=(void *)SVGABuffer.BackBuffer;
-     for (i=0;i<SVGABuffer.BufferSize / 4;i++) intBuffer[i]=SVGAMesa->clear_truecolor;
-    } else {
-    for (i=x;i<width;i++)    
-     for (j=y;j<height;j++)    
-      __svga_drawpixel32(i,j,SVGAMesa->clear_truecolor);
-    }	
+   if (mask & DD_FRONT_LEFT_BIT) {
+      if (all) {
+         GLint *intBuffer=(void *)SVGABuffer.FrontBuffer;
+         for (i=0;i<SVGABuffer.BufferSize / 4;i++)
+            intBuffer[i]=SVGAMesa->clear_truecolor;
+      }
+      else {
+         GLubyte *tmp = SVGABuffer.DrawBuffer;
+         SVGABuffer.DrawBuffer = SVGABuffer.FrontBuffer;
+         for (i=x;i<width;i++)    
+            for (j=y;j<height;j++)    
+               __svga_drawpixel32(i,j,SVGAMesa->clear_truecolor);
+         SVGABuffer.DrawBuffer = tmp;
+      }
+   }
+   if (mask & DD_BACK_LEFT_BIT) {
+      if (all) {
+         GLint *intBuffer=(void *)SVGABuffer.BackBuffer;
+         for (i=0;i<SVGABuffer.BufferSize / 4;i++)
+            intBuffer[i]=SVGAMesa->clear_truecolor;
+      }
+      else {
+         GLubyte *tmp = SVGABuffer.DrawBuffer;
+         SVGABuffer.DrawBuffer = SVGABuffer.BackBuffer;
+         for (i=x;i<width;i++)    
+            for (j=y;j<height;j++)    
+               __svga_drawpixel32(i,j,SVGAMesa->clear_truecolor);
+         SVGABuffer.DrawBuffer = tmp;
+      }
    }
-   return mask & (~GL_COLOR_BUFFER_BIT);
+   return mask & (~(DD_FRONT_LEFT_BIT | DD_BACK_LEFT_BIT));
 }
 
 void __write_rgba_span32( const GLcontext *ctx, GLuint n, GLint x, GLint y,
diff --git a/src/mesa/drivers/svga/svgamesa8.c b/src/mesa/drivers/svga/svgamesa8.c
index dc9df3f4128..048ad988597 100644
--- a/src/mesa/drivers/svga/svgamesa8.c
+++ b/src/mesa/drivers/svga/svgamesa8.c
@@ -1,8 +1,8 @@
-/* $Id: svgamesa8.c,v 1.3 2000/01/23 17:49:54 brianp Exp $ */
+/* $Id: svgamesa8.c,v 1.4 2000/01/25 00:03:02 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
- * Version:  3.2
+ * Version:  3.3
  * Copyright (C) 1995-2000  Brian Paul
  *
  * This library is free software; you can redistribute it and/or
@@ -31,25 +31,22 @@
 
 
 #include "svgapix.h"
+#include "svgamesa8.h"
 
-int __svga_drawpixel8(int x, int y, unsigned long c)
+static void __svga_drawpixel8(int x, int y, unsigned long c)
 {
     unsigned long offset;
-
     y = SVGAInfo->height-y-1;
     offset = y * SVGAInfo->linewidth + x;
-    SVGABuffer.BackBuffer[offset]=c;
-    
-    return 0;
+    SVGABuffer.DrawBuffer[offset]=c;
 }
 
-unsigned long __svga_getpixel8(int x, int y)
+static unsigned long __svga_getpixel8(int x, int y)
 {
     unsigned long offset;
-
     y = SVGAInfo->height-y-1;
     offset = y * SVGAInfo->linewidth + x;
-    return SVGABuffer.BackBuffer[offset];
+    return SVGABuffer.ReadBuffer[offset];
 }
 
 void __set_index8( GLcontext *ctx, GLuint index )
@@ -67,18 +64,33 @@ GLbitfield __clear8( GLcontext *ctx, GLbitfield mask, GLboolean all,
 {
    int i,j;
    
-   if (mask & GL_COLOR_BUFFER_BIT) {
-   
-    if (all) 
-    { 
-     memset(SVGABuffer.BackBuffer,SVGAMesa->clear_index,SVGABuffer.BufferSize);
-    } else {
-    for (i=x;i<width;i++)    
-     for (j=y;j<height;j++)    
-      __svga_drawpixel8(i,j,SVGAMesa->clear_index);
-    }
-   }    
-   return mask & (~GL_COLOR_BUFFER_BIT);
+   if (mask & DD_FRONT_LEFT_BIT) {
+      if (all) { 
+         memset(SVGABuffer.FrontBuffer, SVGAMesa->clear_index, SVGABuffer.BufferSize);
+      }
+      else {
+         GLubyte *tmp = SVGABuffer.DrawBuffer;
+         SVGABuffer.DrawBuffer = SVGABuffer.FrontBuffer;
+         for (i=x;i<width;i++)
+            for (j=y;j<height;j++)
+               __svga_drawpixel8(i,j,SVGAMesa->clear_index);
+         SVGABuffer.DrawBuffer = tmp;
+      }
+   }
+   if (mask & DD_BACK_LEFT_BIT) {
+      if (all) { 
+         memset(SVGABuffer.BackBuffer, SVGAMesa->clear_index, SVGABuffer.BufferSize);
+      }
+      else {
+         GLubyte *tmp = SVGABuffer.DrawBuffer;
+         SVGABuffer.DrawBuffer = SVGABuffer.BackBuffer;
+         for (i=x;i<width;i++)
+            for (j=y;j<height;j++)
+               __svga_drawpixel8(i,j,SVGAMesa->clear_index);
+         SVGABuffer.DrawBuffer = tmp;
+      }
+   }
+   return mask & (~(DD_FRONT_LEFT_BIT | DD_BACK_LEFT_BIT));
 }
 
 void __write_ci32_span8( const GLcontext *ctx, GLuint n, GLint x, GLint y,
diff --git a/src/mesa/drivers/svga/svgapix.h b/src/mesa/drivers/svga/svgapix.h
index 151975a909c..72d389e758d 100644
--- a/src/mesa/drivers/svga/svgapix.h
+++ b/src/mesa/drivers/svga/svgapix.h
@@ -1,8 +1,8 @@
-/* $Id: svgapix.h,v 1.2 2000/01/22 20:08:36 brianp Exp $ */
+/* $Id: svgapix.h,v 1.3 2000/01/25 00:03:02 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
- * Version:  3.2
+ * Version:  3.3
  * Copyright (C) 1995-2000  Brian Paul
  *
  * This library is free software; you can redistribute it and/or
@@ -62,6 +62,8 @@ struct svga_buffer {
    GLubyte   * FrontBuffer;
    GLubyte   * BackBuffer;
    GLubyte   * VideoRam;
+   GLubyte   * DrawBuffer;  /* == FrontBuffer or BackBuffer */
+   GLubyte   * ReadBuffer;  /* == FrontBuffer or BackBuffer */
 };
 
 extern struct svga_buffer SVGABuffer;