From 355467bed8cf34cf5967c7be3c5f1b87ff08f845 Mon Sep 17 00:00:00 2001
From: Brian Paul <brian.paul@tungstengraphics.com>
Date: Sun, 31 Oct 2004 15:39:04 +0000
Subject: Allow the software fallback glDrawPixels, glReadPixels, glBitmap
 commands to work with real, hardware-based PBOs in the future by
 mapping/unmapping the PBO buffer as needed.

---
 src/mesa/swrast/s_bitmap.c | 34 ++++++++++++++++++++++++++--------
 1 file changed, 26 insertions(+), 8 deletions(-)

(limited to 'src/mesa/swrast/s_bitmap.c')

diff --git a/src/mesa/swrast/s_bitmap.c b/src/mesa/swrast/s_bitmap.c
index 8bd9854f0c..be728911b6 100644
--- a/src/mesa/swrast/s_bitmap.c
+++ b/src/mesa/swrast/s_bitmap.c
@@ -1,6 +1,6 @@
 /*
  * Mesa 3-D graphics library
- * Version:  6.1
+ * Version:  6.3
  *
  * Copyright (C) 1999-2004  Brian Paul   All Rights Reserved.
  *
@@ -29,6 +29,7 @@
  */
 
 #include "glheader.h"
+#include "bufferobj.h"
 #include "image.h"
 #include "macros.h"
 #include "pixel.h"
@@ -54,13 +55,24 @@ _swrast_Bitmap( GLcontext *ctx, GLint px, GLint py,
 
    ASSERT(ctx->RenderMode == GL_RENDER);
 
-   bitmap = (const GLubyte *) _swrast_validate_pbo_access(unpack, width,
-                                        height, 1,
-                                        GL_COLOR_INDEX, GL_BITMAP,
-                                        (GLvoid *) bitmap);
-   if (!bitmap) {
-      /* XXX GL_INVALID_OPERATION? */
-      return;
+   if (unpack->BufferObj->Name) {
+      /* unpack from PBO */
+      GLubyte *buf;
+      if (!_mesa_validate_pbo_access(unpack, width, height, 1,
+                                     GL_COLOR_INDEX, GL_BITMAP,
+                                     (GLvoid *) bitmap)) {
+         _mesa_error(ctx, GL_INVALID_OPERATION,"glBitmap(invalid PBO access)");
+         return;
+      }
+      buf = (GLubyte *) ctx->Driver.MapBuffer(ctx, GL_PIXEL_UNPACK_BUFFER_EXT,
+                                              GL_READ_ONLY_ARB,
+                                              unpack->BufferObj);
+      if (!buf) {
+         /* buffer is already mapped - that's an error */
+         _mesa_error(ctx, GL_INVALID_OPERATION, "glBitmap(PBO is mapped)");
+         return;
+      }
+      bitmap = ADD_POINTERS(buf, bitmap);
    }
 
    RENDER_START(swrast,ctx);
@@ -153,6 +165,12 @@ _swrast_Bitmap( GLcontext *ctx, GLint px, GLint py,
    }
 
    RENDER_FINISH(swrast,ctx);
+
+   if (unpack->BufferObj->Name) {
+      /* done with PBO so unmap it now */
+      ctx->Driver.UnmapBuffer(ctx, GL_PIXEL_UNPACK_BUFFER_EXT,
+                              unpack->BufferObj);
+   }
 }
 
 
-- 
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