Mesa (master): main: Add utility function _mesa_lookup_bufferobj_err.

[Laura Ekstrand]

Module: Mesa
Branch: master
Commit: 768ca8b83e45b1d23c0d3af0b79cc19c1b3b6988
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=768ca8b83e45b1d23c0d3af0b79cc19c1b3b6988

Author: Laura Ekstrand <laura at jlekstrand.net>
Date:   Fri Jan  9 16:16:48 2015 -0800

main: Add utility function _mesa_lookup_bufferobj_err.

This function is exposed to mesa driver internals so that texture buffer
objects and array objects can use it.

Reviewed-by: Anuj Phogat <anuj.phogat at gmail.com>

---

 src/mesa/main/bufferobj.c |   19 +++++++++++++++++++
 src/mesa/main/bufferobj.h |    4 ++++
 2 files changed, 23 insertions(+)

diff --git a/src/mesa/main/bufferobj.c b/src/mesa/main/bufferobj.c
index e1c5877..cef284f 100644
--- a/src/mesa/main/bufferobj.c
+++ b/src/mesa/main/bufferobj.c
@@ -1006,6 +1006,25 @@ _mesa_lookup_bufferobj_locked(struct gl_context *ctx, GLuint buffer)
       _mesa_HashLookupLocked(ctx->Shared->BufferObjects, buffer);
 }
 
+/**
+ * A convenience function for direct state access functions that throws
+ * GL_INVALID_OPERATION if buffer is not the name of a buffer object in the
+ * hash table.
+ */
+struct gl_buffer_object *
+_mesa_lookup_bufferobj_err(struct gl_context *ctx, GLuint buffer,
+                           const char *caller)
+{
+   struct gl_buffer_object *bufObj;
+
+   bufObj = _mesa_lookup_bufferobj(ctx, buffer);
+   if (!bufObj)
+      _mesa_error(ctx, GL_INVALID_OPERATION,
+                  "%s(non-generated buffer name %u)", caller, buffer);
+
+   return bufObj;
+}
+
 
 void
 _mesa_begin_bufferobj_lookups(struct gl_context *ctx)
diff --git a/src/mesa/main/bufferobj.h b/src/mesa/main/bufferobj.h
index fe294fc..8e53bfd 100644
--- a/src/mesa/main/bufferobj.h
+++ b/src/mesa/main/bufferobj.h
@@ -89,6 +89,10 @@ _mesa_lookup_bufferobj(struct gl_context *ctx, GLuint buffer);
 extern struct gl_buffer_object *
 _mesa_lookup_bufferobj_locked(struct gl_context *ctx, GLuint buffer);
 
+extern struct gl_buffer_object *
+_mesa_lookup_bufferobj_err(struct gl_context *ctx, GLuint buffer,
+                           const char *caller);
+
 extern void
 _mesa_begin_bufferobj_lookups(struct gl_context *ctx);