1 files changed, 31 insertions, 13 deletions

diff --git a/src/mesa/main/bufferobj.c b/src/mesa/main/bufferobj.c
index 5f8071f587f..5b6db78d821 100644
--- a/src/mesa/main/bufferobj.c
+++ b/src/mesa/main/bufferobj.c
@@ -49,13 +49,6 @@
 /*#define BOUNDS_CHECK*/
 
 
-#if FEATURE_OES_mapbuffer
-#define DEFAULT_ACCESS GL_MAP_WRITE_BIT
-#else
-#define DEFAULT_ACCESS (GL_MAP_READ_BIT | GL_MAP_WRITE_BIT)
-#endif
-
-
 /**
  * Used as a placeholder for buffer objects between glGenBuffers() and
  * glBindBuffer() so that glIsBuffer() can work correctly.
@@ -122,6 +115,30 @@ get_buffer(struct gl_context *ctx, GLenum target)
 }
 
 
+static inline GLenum
+default_access_mode(const struct gl_context *ctx)
+{
+   /* Table 2.6 on page 31 (page 44 of the PDF) of the OpenGL 1.5 spec says:
+    *
+    * Name           Type  Initial Value  Legal Values
+    * ...            ...   ...            ...
+    * BUFFER_ACCESS  enum  READ_WRITE     READ_ONLY, WRITE_ONLY
+    *                                     READ_WRITE
+    *
+    * However, table 6.8 in the GL_OES_mapbuffer extension says:
+    *
+    * Get Value         Type Get Command          Value          Description
+    * ---------         ---- -----------          -----          -----------
+    * BUFFER_ACCESS_OES Z1   GetBufferParameteriv WRITE_ONLY_OES buffer map flag
+    *
+    * The difference is because GL_OES_mapbuffer only supports mapping buffers
+    * write-only.
+    */
+   return (ctx->API == API_OPENGLES)
+      ? GL_MAP_WRITE_BIT : (GL_MAP_READ_BIT | GL_MAP_WRITE_BIT);
+}
+
+
 /**
  * Convert a GLbitfield describing the mapped buffer access flags
  * into one of GL_READ_WRITE, GL_READ_ONLY, or GL_WRITE_ONLY.
@@ -213,7 +230,7 @@ _mesa_new_buffer_object( struct gl_context *ctx, GLuint name, GLenum target )
    (void) ctx;
 
    obj = MALLOC_STRUCT(gl_buffer_object);
-   _mesa_initialize_buffer_object(obj, name, target);
+   _mesa_initialize_buffer_object(ctx, obj, name, target);
    return obj;
 }
 
@@ -311,7 +328,8 @@ _mesa_reference_buffer_object_(struct gl_context *ctx,
  * Initialize a buffer object to default values.
  */
 void
-_mesa_initialize_buffer_object( struct gl_buffer_object *obj,
+_mesa_initialize_buffer_object( struct gl_context *ctx,
+				struct gl_buffer_object *obj,
 				GLuint name, GLenum target )
 {
    (void) target;
@@ -321,7 +339,7 @@ _mesa_initialize_buffer_object( struct gl_buffer_object *obj,
    obj->RefCount = 1;
    obj->Name = name;
    obj->Usage = GL_STATIC_DRAW_ARB;
-   obj->AccessFlags = DEFAULT_ACCESS;
+   obj->AccessFlags = default_access_mode(ctx);
 }
 
 
@@ -740,7 +758,7 @@ _mesa_DeleteBuffersARB(GLsizei n, const GLuint *ids)
          if (_mesa_bufferobj_mapped(bufObj)) {
             /* if mapped, unmap it now */
             ctx->Driver.UnmapBuffer(ctx, bufObj);
-            bufObj->AccessFlags = DEFAULT_ACCESS;
+            bufObj->AccessFlags = default_access_mode(ctx);
             bufObj->Pointer = NULL;
          }
 
@@ -900,7 +918,7 @@ _mesa_BufferDataARB(GLenum target, GLsizeiptrARB size,
    if (_mesa_bufferobj_mapped(bufObj)) {
       /* Unmap the existing buffer.  We'll replace it now.  Not an error. */
       ctx->Driver.UnmapBuffer(ctx, bufObj);
-      bufObj->AccessFlags = DEFAULT_ACCESS;
+      bufObj->AccessFlags = default_access_mode(ctx);
       ASSERT(bufObj->Pointer == NULL);
    }  
 
@@ -1119,7 +1137,7 @@ _mesa_UnmapBufferARB(GLenum target)
 #endif
 
    status = ctx->Driver.UnmapBuffer( ctx, bufObj );
-   bufObj->AccessFlags = DEFAULT_ACCESS;
+   bufObj->AccessFlags = default_access_mode(ctx);
    ASSERT(bufObj->Pointer == NULL);
    ASSERT(bufObj->Offset == 0);
    ASSERT(bufObj->Length == 0);