From 3b4fbbc129c711a5aec8d653d5c6eb2e195f947c Mon Sep 17 00:00:00 2001
From: Brian Paul <brian.paul@tungstengraphics.com>
Date: Tue, 9 Jul 2002 01:22:50 +0000
Subject: Overhaul of glRead/DrawBuffer() code.  Now,
 swrast->Driver.SetBuffer() indicates the read AND draw color buffer for all
 software rasterization. Lots of related clean-ups.  See RELNOTES-4.1 for
 details.

---
 src/mesa/drivers/svga/svgamesa.c | 37 +++++++------------------------------
 1 file changed, 7 insertions(+), 30 deletions(-)

(limited to 'src/mesa/drivers/svga')

diff --git a/src/mesa/drivers/svga/svgamesa.c b/src/mesa/drivers/svga/svgamesa.c
index 5d2e3d55a2..270455ee69 100644
--- a/src/mesa/drivers/svga/svgamesa.c
+++ b/src/mesa/drivers/svga/svgamesa.c
@@ -1,4 +1,4 @@
-/* $Id: svgamesa.c,v 1.19 2002/06/15 02:38:17 brianp Exp $ */
+/* $Id: svgamesa.c,v 1.20 2002/07/09 01:22:51 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
@@ -217,34 +217,9 @@ static void get_buffer_size( GLframebuffer *buffer, GLuint *width, GLuint *heigh
    *height = SVGAMesa->height = vga_getydim();
 }
 
-static void set_draw_buffer( GLcontext *ctx, GLenum buffer )
-{
-   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
-   }
-   else if (buffer == GL_BACK_LEFT) {
-      SVGABuffer.DrawBuffer = SVGABuffer.BackBuffer;
-#if 0
-      /*    vga_waitretrace(); */
-      copy_buffer(SVGABuffer.BackBuffer);
-#endif
-   }
-   else {
-      /* nothing since we don't have any point/line/triangle functions. */
-   }
-}
 
-
-static void set_read_buffer( GLcontext *ctx, GLframebuffer *colorBuffer,
-                             GLenum buffer )
+static void set_buffer( GLcontext *ctx, GLframebuffer *colorBuffer,
+                        GLenum buffer )
 {
    /* We can ignore colorBuffer since we don't support a MakeCurrentRead()
     * function.
@@ -253,6 +228,7 @@ static void set_read_buffer( GLcontext *ctx, GLframebuffer *colorBuffer,
 
    if (buffer == GL_FRONT_LEFT) {
       SVGABuffer.ReadBuffer = SVGABuffer.FrontBuffer;
+      SVGABuffer.DrawBuffer = SVGABuffer.FrontBuffer;
 #if 0
       void * tmpptr;
       /*    vga_waitretrace(); */
@@ -264,6 +240,7 @@ static void set_read_buffer( GLcontext *ctx, GLframebuffer *colorBuffer,
    }
    else if (buffer == GL_BACK_LEFT) {
       SVGABuffer.ReadBuffer = SVGABuffer.BackBuffer;
+      SVGABuffer.DrawBuffer = SVGABuffer.BackBuffer;
 #if 0
       /*    vga_waitretrace(); */
       copy_buffer(SVGABuffer.BackBuffer);
@@ -285,7 +262,6 @@ static void svgamesa_update_state( GLcontext *ctx, GLuint new_state )
    ctx->Driver.UpdateState = svgamesa_update_state;
 
    ctx->Driver.GetBufferSize = get_buffer_size;
-   ctx->Driver.SetDrawBuffer = set_draw_buffer;
    ctx->Driver.ResizeBuffers = _swrast_alloc_buffers;
 
    /* Software rasterizer pixel paths:
@@ -295,10 +271,11 @@ static void svgamesa_update_state( GLcontext *ctx, GLuint new_state )
    ctx->Driver.CopyPixels = _swrast_CopyPixels;
    ctx->Driver.DrawPixels = _swrast_DrawPixels;
    ctx->Driver.ReadPixels = _swrast_ReadPixels;
+   ctx->Driver.DrawBuffer = _swrast_DrawBuffer;
 
    /* Fill in the swrast driver interface:
     */
-   swdd->SetReadBuffer = set_read_buffer;
+   swdd->SetBuffer = set_buffer;
 
    switch (SVGABuffer.Depth) {
     case  8: ctx->Driver.ClearIndex = __clear_index8;
-- 
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