mesa: Delete VAO _MaxElement code and index buffer bounds checking.

Fredrik's implementation of ARB_vertex_attrib_binding introduced new
gl_vertex_attrib_array and gl_vertex_buffer_binding structures, and
converted Mesa's older gl_client_array to be derived state.  Ultimately,
we'd like to drop gl_client_array and use those structures directly.

One hitch is that gl_client_array::_MaxElement doesn't correspond to
either structure (unlike every other field), so we'd have to figure out
where to store it.  The _MaxElement computation uses values from both
structures, so it doesn't really belong in either place.  We could put
it in the VAO, but we'd have to pass it around everywhere.

It turns out that it's only used when ctx->Const.CheckArrayBounds is
set, which is only set by the (rarely used) classic swrast driver.
It appears that drivers/x11 used to set it as well, which was intended
to avoid segmentation faults on out-of-bounds memory access in the X
server (probably for indirect GLX clients).  However, ajax deleted that
code in 2010 (commit 1ccef926be46dce3b6b5c76e812e2fae4e205ce7).

The bounds checking apparently doesn't actually work, either.  Non-VBO
attributes arbitrarily set _MaxElement to 2 * 1000 * 1000 * 1000.
vbo_save_draw and vbo_exec_draw remark /* ??? */ when setting it, and
the i965 code contains a comment noting that _MaxElement is often bogus.

Given that the code is complex, rarely used, and dubiously functional,
it doesn't seem worth maintaining going forward.  This patch drops it.

This will probably mean the classic swrast driver may begin crashing on
out of bounds vertex buffer access in some cases, but I believe that is
allowed by OpenGL (and probably happened for non-VBO accesses anyway).
There do not appear to be any Piglit regressions, either.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Brian Paul <brianp@vmware.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
Acked-by: Roland Scheidegger <sroland@vmware.com>

1 files changed, 0 insertions, 46 deletions

diff --git a/src/mesa/main/arrayobj.c b/src/mesa/main/arrayobj.c
index 1ea319a..0d77b11 100644
--- a/src/mesa/main/arrayobj.c
+++ b/src/mesa/main/arrayobj.c
@@ -291,52 +291,6 @@ remove_array_object( struct gl_context *ctx, struct gl_vertex_array_object *obj
 }
 
 
-
-/**
- * Helper for _mesa_update_vao_max_element().
- * \return  min(vao->_VertexAttrib[*]._MaxElement).
- */
-static GLuint
-compute_max_element(struct gl_vertex_array_object *vao, GLbitfield64 enabled)
-{
-   GLuint min = ~((GLuint)0);
-
-   while (enabled) {
-      struct gl_client_array *client_array;
-      GLint attrib = ffsll(enabled) - 1;
-      enabled ^= BITFIELD64_BIT(attrib);
-
-      client_array = &vao->_VertexAttrib[attrib];
-      assert(client_array->Enabled);
-      _mesa_update_array_max_element(client_array);
-      min = MIN2(min, client_array->_MaxElement);
-   }
-
-   return min;
-}
-
-
-/**
- * Examine vertex arrays to update the gl_vertex_array_object::_MaxElement field.
- */
-void
-_mesa_update_vao_max_element(struct gl_context *ctx,
-                                      struct gl_vertex_array_object *vao)
-{
-   GLbitfield64 enabled;
-
-   if (!ctx->VertexProgram._Current ||
-       ctx->VertexProgram._Current == ctx->VertexProgram._TnlProgram) {
-      enabled = _mesa_array_object_get_enabled_ff(vao);
-   } else {
-      enabled = _mesa_array_object_get_enabled_arb(vao);
-   }
-
-   /* _MaxElement is one past the last legal array element */
-   vao->_MaxElement = compute_max_element(vao, enabled);
-}
-
-
 /**
  * Updates the derived gl_client_arrays when a gl_vertex_attrib_array
  * or a gl_vertex_buffer_binding has changed.