From 2daa4137b658569da542180442fc32ebc5608102 Mon Sep 17 00:00:00 2001
From: Brian Paul <brian.paul@tungstengraphics.com>
Date: Sun, 31 Oct 2004 00:17:42 +0000
Subject: Remove redundant error checking. Added _mesa_buffer_unmap(). Minor
 clean-ups.

---
 src/mesa/main/bufferobj.c | 70 ++++++++++++++++++++++++++++++++---------------
 src/mesa/main/bufferobj.h |  5 +++-
 2 files changed, 52 insertions(+), 23 deletions(-)

(limited to 'src/mesa/main')

diff --git a/src/mesa/main/bufferobj.c b/src/mesa/main/bufferobj.c
index 0d0e5f4bcf..c795d2f16a 100644
--- a/src/mesa/main/bufferobj.c
+++ b/src/mesa/main/bufferobj.c
@@ -1,6 +1,6 @@
 /*
  * Mesa 3-D graphics library
- * Version:  6.2
+ * Version:  6.3
  *
  * Copyright (C) 1999-2004  Brian Paul   All Rights Reserved.
  *
@@ -123,7 +123,8 @@ buffer_object_subdata_range_good( GLcontext * ctx, GLenum target,
       return NULL;
    }
 
-   if ( bufObj->Pointer != NULL ) {
+   if ( bufObj->Pointer ) {
+      /* Buffer is currently mapped */
       _mesa_error(ctx, GL_INVALID_OPERATION, "%s", str);
       return NULL;
    }
@@ -318,16 +319,16 @@ _mesa_buffer_get_subdata( GLcontext *ctx, GLenum target, GLintptrARB offset,
 
 
 /**
- * Maps the private data buffer into the processor's address space.
+ * Fallback function called via ctx->Driver.MapBuffer().
+ * Hardware drivers that really implement buffer objects should never use
+ * function.
  *
- * This function is intended to be called by \c dd_function_table::MapBuffer.
- * This function need not set GL error codes.  The input parameters will have
- * been tested before calling.
+ * The input parameters will have been already tested for errors.
  *
  * \param ctx     GL context.
  * \param target  Buffer object target on which to operate.
  * \param access  Information about how the buffer will be accessed.
- * \param bufObj  Object to be used.
+ * \param bufObj  Object to be mapped.
  * \return  A pointer to the object's internal data store that can be accessed
  *          by the processor
  *
@@ -335,10 +336,41 @@ _mesa_buffer_get_subdata( GLcontext *ctx, GLenum target, GLintptrARB offset,
  */
 void *
 _mesa_buffer_map( GLcontext *ctx, GLenum target, GLenum access,
-		  struct gl_buffer_object * bufObj )
+		  struct gl_buffer_object *bufObj )
+{
+   (void) ctx;
+   (void) target;
+   (void) access;
+   ASSERT(!bufObj->OnCard);
+   /* Just return a direct pointer to the data */
+   if (bufObj->Pointer) {
+      /* already mapped! */
+      return NULL;
+   }
+   bufObj->Pointer = bufObj->Data;
+   return bufObj->Pointer;
+}
+
+
+/**
+ * Fallback function called via ctx->Driver.MapBuffer().
+ * Hardware drivers that really implement buffer objects should never use
+ * function.
+ *
+ * The input parameters will have been already tested for errors.
+ *
+ * \sa glUnmapBufferARB, dd_function_table::UnmapBuffer
+ */
+GLboolean
+_mesa_buffer_unmap( GLcontext *ctx, GLenum target,
+                    struct gl_buffer_object *bufObj )
 {
-   (void) ctx; (void) target; (void) access;
-   return bufObj->Data;
+   (void) ctx;
+   (void) target;
+   ASSERT(!bufObj->OnCard);
+   /* XXX we might assert here that bufObj->Pointer is non-null */
+   bufObj->Pointer = NULL;
+   return GL_TRUE;
 }
 
 
@@ -383,6 +415,10 @@ _mesa_init_buffer_objects( GLcontext *ctx )
  * glGetTexImage, etc) we call this function to check that we're not
  * going to read out of bounds.
  *
+ * XXX This would also be a convenient time to check that the PBO isn't
+ * currently mapped.  Whoever calls this function should check for that.
+ * Remember, we can't use a PBO when it's mapped!
+ *
  * \param width  width of image to read/write
  * \param height  height of image to read/write
  * \param depth  depth of image to read/write
@@ -755,15 +791,10 @@ _mesa_BufferSubDataARB(GLenum target, GLintptrARB offset,
    bufObj = buffer_object_subdata_range_good( ctx, target, offset, size,
                                               "BufferSubDataARB" );
    if (!bufObj) {
-      _mesa_error(ctx, GL_INVALID_OPERATION, "glBufferSubDataARB" );
+      /* error already recorded */
       return;
    }
 
-   if (bufObj->Pointer) {
-      _mesa_error(ctx, GL_INVALID_OPERATION, "glBufferSubDataARB(buffer is mapped)" );
-      return;
-   }  
-
    ASSERT(ctx->Driver.BufferSubData);
    (*ctx->Driver.BufferSubData)( ctx, target, offset, size, data, bufObj );
 }
@@ -780,15 +811,10 @@ _mesa_GetBufferSubDataARB(GLenum target, GLintptrARB offset,
    bufObj = buffer_object_subdata_range_good( ctx, target, offset, size,
                                               "GetBufferSubDataARB" );
    if (!bufObj) {
-      _mesa_error(ctx, GL_INVALID_OPERATION, "glGetBufferSubDataARB" );
+      /* error already recorded */
       return;
    }
 
-   if (bufObj->Pointer) {
-      _mesa_error(ctx, GL_INVALID_OPERATION, "glGetBufferSubDataARB(buffer is mapped)" );
-      return;
-   }  
-
    ASSERT(ctx->Driver.GetBufferSubData);
    (*ctx->Driver.GetBufferSubData)( ctx, target, offset, size, data, bufObj );
 }
diff --git a/src/mesa/main/bufferobj.h b/src/mesa/main/bufferobj.h
index e6bd8b329a..635975d2f7 100644
--- a/src/mesa/main/bufferobj.h
+++ b/src/mesa/main/bufferobj.h
@@ -1,6 +1,6 @@
 /*
  * Mesa 3-D graphics library
- * Version:  6.1
+ * Version:  6.3
  *
  * Copyright (C) 1999-2004  Brian Paul   All Rights Reserved.
  *
@@ -73,6 +73,9 @@ extern void *
 _mesa_buffer_map( GLcontext *ctx, GLenum target, GLenum access,
 		  struct gl_buffer_object * bufObj );
 
+extern GLboolean
+_mesa_buffer_unmap( GLcontext *ctx, GLenum target,
+                    struct gl_buffer_object * bufObj );
 
 extern GLboolean
 _mesa_validate_pbo_access(const struct gl_pixelstore_attrib *pack,
-- 
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