replaced Driver.SetBuffer() with SetDrawBuffer() and SetReadBuffer()

src/mesa/drivers/glide/fxdd.c

@@ -242,8 +242,9 @@ static GLbitfield fxDDClear(GLcontext *ctx, GLbitfield mask, GLboolean all,
 }
 
 
-/*  Set the buffer used in double buffering */
-static GLboolean fxDDSetBuffer(GLcontext *ctx, GLenum mode )
+/* Set the buffer used for drawing */
+/* XXX support for separate read/draw buffers hasn't been tested */
+static GLboolean fxDDSetDrawBuffer(GLcontext *ctx, GLenum mode )
 {
   fxMesaContext fxMesa=(fxMesaContext)ctx->DriverCtx;
 
@@ -267,6 +268,29 @@ static GLboolean fxDDSetBuffer(GLcontext *ctx, GLenum mode )
 }
 
 
+/* Set the buffer used for reading */
+/* XXX support for separate read/draw buffers hasn't been tested */
+static void fxDDSetReadBuffer(GLcontext *ctx, GLframebuffer *buffer,
+                              GLenum mode )
+{
+  fxMesaContext fxMesa=(fxMesaContext)ctx->DriverCtx;
+  (void) buffer;
+
+  if (MESA_VERBOSE&VERBOSE_DRIVER) {
+    fprintf(stderr,"fxmesa: fxDDSetBuffer(%x)\n",mode);
+  }
+
+  if (mode == GL_FRONT_LEFT) {
+    fxMesa->currentFB = GR_BUFFER_FRONTBUFFER;
+    FX_grRenderBuffer(fxMesa->currentFB);
+  }
+  else if (mode == GL_BACK_LEFT) {
+    fxMesa->currentFB = GR_BUFFER_BACKBUFFER;
+    FX_grRenderBuffer(fxMesa->currentFB);
+  }
+}
+
+
 #ifdef XF86DRI
 static GLboolean inClipRects(fxMesaContext fxMesa, int px, int py)
 {
@@ -808,7 +832,8 @@ void fxSetupDDPointers(GLcontext *ctx)
   ctx->Driver.Index=NULL;
   ctx->Driver.Color=fxDDSetColor;
 
-  ctx->Driver.SetBuffer=fxDDSetBuffer;
+  ctx->Driver.SetDrawBuffer=fxDDSetDrawBuffer;
+  ctx->Driver.SetReadBuffer=fxDDSetReadBuffer;
   ctx->Driver.GetBufferSize=fxDDBufferSize;
 
   ctx->Driver.Bitmap=fxDDDrawBitMap;

src/mesa/drivers/osmesa/osmesa.c

@@ -1,4 +1,4 @@
-/* $Id: osmesa.c,v 1.3 1999/11/11 01:28:41 brianp Exp $ */
+/* $Id: osmesa.c,v 1.4 1999/11/25 17:37:00 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
@@ -541,7 +541,7 @@ GLboolean GLAPIENTRY OSMesaGetDepthBuffer( OSMesaContext c, GLint *width, GLint
 
 
 
-static GLboolean set_buffer( GLcontext *ctx, GLenum mode )
+static GLboolean set_draw_buffer( GLcontext *ctx, GLenum mode )
 {
    (void) ctx;
    if (mode==GL_FRONT_LEFT) {
@@ -553,6 +553,14 @@ static GLboolean set_buffer( GLcontext *ctx, GLenum mode )
 }
 
 
+static void set_read_buffer( GLcontext *ctx, GLframebuffer *buffer, GLenum mode )
+{
+   /* separate read buffer not supported */
+   ASSERT(buffer == ctx->DrawBuffer);
+   ASSERT(mode == GL_FRONT_LEFT);
+}
+
+
 static void clear_index( GLcontext *ctx, GLuint index )
 {
    OSMesaContext osmesa = (OSMesaContext) ctx->DriverCtx;
@@ -1539,7 +1547,8 @@ static void osmesa_update_state( GLcontext *ctx )
    ctx->Driver.GetString = get_string;
    ctx->Driver.UpdateState = osmesa_update_state;
 
-   ctx->Driver.SetBuffer = set_buffer;
+   ctx->Driver.SetDrawBuffer = set_draw_buffer;
+   ctx->Driver.SetReadBuffer = set_read_buffer;
    ctx->Driver.Color = set_color;
    ctx->Driver.Index = set_index;
    ctx->Driver.ClearIndex = clear_index;

src/mesa/main/accum.c

@@ -1,4 +1,4 @@
-/* $Id: accum.c,v 1.12 1999/11/24 18:48:30 brianp Exp $ */
+/* $Id: accum.c,v 1.13 1999/11/25 17:36:48 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
@@ -221,7 +221,8 @@ _mesa_Accum( GLenum op, GLfloat value )
 	 break;
 
       case GL_ACCUM:
-         (void) (*ctx->Driver.SetBuffer)( ctx, ctx->Pixel.DriverReadBuffer );
+         (*ctx->Driver.SetReadBuffer)( ctx, ctx->ReadBuffer,
+                                       ctx->Pixel.DriverReadBuffer );
 
          /* May have to leave optimized accum buffer mode */
          if (ctx->IntegerAccumScaler == 0.0 && value > 0.0 && value <= 1.0)
@@ -269,11 +270,14 @@ _mesa_Accum( GLenum op, GLfloat value )
                ypos++;
             }
          }
-         (void) (*ctx->Driver.SetBuffer)( ctx, ctx->Color.DriverDrawBuffer );
+         /* restore read buffer = draw buffer (the default) */
+         (*ctx->Driver.SetReadBuffer)( ctx, ctx->DrawBuffer,
+                                       ctx->Color.DriverDrawBuffer );
 	 break;
 
       case GL_LOAD:
-         (void) (*ctx->Driver.SetBuffer)( ctx, ctx->Pixel.DriverReadBuffer );
+         (*ctx->Driver.SetReadBuffer)( ctx, ctx->ReadBuffer,
+                                       ctx->Pixel.DriverReadBuffer );
 
          /* This is a change to go into optimized accum buffer mode */
          if (value > 0.0 && value <= 1.0) {
@@ -328,7 +332,10 @@ _mesa_Accum( GLenum op, GLfloat value )
                ypos++;
             }
          }
-         (void) (*ctx->Driver.SetBuffer)( ctx, ctx->Color.DriverDrawBuffer );
+
+         /* restore read buffer = draw buffer (the default) */
+         (*ctx->Driver.SetReadBuffer)( ctx, ctx->DrawBuffer,
+                                       ctx->Color.DriverDrawBuffer );
 	 break;
 
       case GL_RETURN:

src/mesa/main/dd.h

@@ -1,4 +1,4 @@
-/* $Id: dd.h,v 1.5 1999/11/22 21:54:14 brianp Exp $ */
+/* $Id: dd.h,v 1.6 1999/11/25 17:36:48 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
@@ -180,9 +180,9 @@ struct dd_function_table {
     * This color should also be used in the "mono" drawing functions.
     */
 
-   GLboolean (*SetBuffer)( GLcontext *ctx, GLenum buffer );
+   GLboolean (*SetDrawBuffer)( GLcontext *ctx, GLenum buffer );
    /*
-    * Selects the color buffer(s) for reading and writing.
+    * Specifies the current buffer for writing.
     * The following values must be accepted when applicable:
     *    GL_FRONT_LEFT - this buffer always exists
     *    GL_BACK_LEFT - when double buffering
@@ -200,6 +200,17 @@ struct dd_function_table {
     *    GL_NONE - disable buffer write in device driver.
     */
 
+   void (*SetReadBuffer)( GLcontext *ctx, GLframebuffer *colorBuffer,
+                          GLenum buffer );
+   /*
+    * Specifies the current buffer for reading.
+    * colorBuffer will be one of:
+    *    GL_FRONT_LEFT - this buffer always exists
+    *    GL_BACK_LEFT - when double buffering
+    *    GL_FRONT_RIGHT - when using stereo
+    *    GL_BACK_RIGHT - when using stereo and double buffering
+    */
+
    void (*GetBufferSize)( GLcontext *ctx, GLuint *width, GLuint *height );
    /*
     * Returns the width and height of the current color buffer.

src/mesa/main/teximage.c

@@ -1,4 +1,4 @@
-/* $Id: teximage.c,v 1.13 1999/11/24 18:48:31 brianp Exp $ */
+/* $Id: teximage.c,v 1.14 1999/11/25 17:36:48 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
@@ -1627,7 +1627,8 @@ read_color_image( GLcontext *ctx, GLint x, GLint y,
       return NULL;
 
    /* Select buffer to read from */
-   (void) (*ctx->Driver.SetBuffer)( ctx, ctx->Pixel.DriverReadBuffer );
+   (*ctx->Driver.SetReadBuffer)( ctx, ctx->ReadBuffer,
+                                 ctx->Pixel.DriverReadBuffer );
 
    dst = image;
    stride = width * 4 * sizeof(GLubyte);
@@ -1637,8 +1638,9 @@ read_color_image( GLcontext *ctx, GLint x, GLint y,
       dst += stride;
    }
 
-   /* Restore drawing buffer */
-   (void) (*ctx->Driver.SetBuffer)( ctx, ctx->Color.DriverDrawBuffer );
+   /* Read from draw buffer (the default) */
+   (*ctx->Driver.SetReadBuffer)( ctx, ctx->DrawBuffer,
+                                 ctx->Color.DriverDrawBuffer );
 
    return image;
 }
@@ -1728,7 +1730,8 @@ copy_tex_sub_image( GLcontext *ctx, struct gl_texture_image *dest,
    components = components_in_intformat( format );
 
    /* Select buffer to read from */
-   (void) (*ctx->Driver.SetBuffer)( ctx, ctx->Pixel.DriverReadBuffer );
+   (*ctx->Driver.SetReadBuffer)( ctx, ctx->ReadBuffer,
+                                 ctx->Pixel.DriverReadBuffer );
 
    for (i = 0;i < height; i++) {
       GLubyte rgba[MAX_WIDTH][4];
@@ -1740,8 +1743,9 @@ copy_tex_sub_image( GLcontext *ctx, struct gl_texture_image *dest,
                                     &packing, GL_TRUE);
    }
 
-   /* Restore drawing buffer */
-   (void) (*ctx->Driver.SetBuffer)( ctx, ctx->Color.DriverDrawBuffer );
+   /* Read from draw buffer (the default) */
+   (*ctx->Driver.SetReadBuffer)( ctx, ctx->DrawBuffer,
+                                 ctx->Color.DriverDrawBuffer );
 }