improved error string

src/mesa/main/teximage.c

-/* $Id: teximage.c,v 1.111 2002/07/09 01:22:50 brianp Exp $ */
+/* $Id: teximage.c,v 1.112 2002/09/03 18:05:17 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
    teximage = _mesa_select_tex_image(ctx, texUnit, target, level);
    if (!teximage) {
       _mesa_error(ctx, GL_INVALID_OPERATION,
-                  "glCopyTexSubImage%dD(undefined texture)", dimensions);
+                  "glCopyTexSubImage%dD(undefined texture level: %d)",
+                  dimensions, level);
       return GL_TRUE;
    }
 
    GET_CURRENT_CONTEXT(ctx);
    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
 
+   internalFormat = GL_RGBA;
+
    if (is_color_format(internalFormat)) {
       _mesa_adjust_image_for_convolution(ctx, 2, &postConvWidth,
 					 &postConvHeight);

src/mesa/tnl/t_imm_api.c

-/* $Id: t_imm_api.c,v 1.30 2002/06/16 01:09:16 brianp Exp $ */
+/* $Id: t_imm_api.c,v 1.31 2002/09/03 18:05:52 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
    ASSERT (!ctx->CompileFlag);
 
    if (mode > GL_POLYGON) {
-      _mesa_error( ctx, GL_INVALID_ENUM, "_tnl_Begin" );
+      _mesa_error( ctx, GL_INVALID_ENUM, "_tnl_Begin(0x%x)", mode );
       return;
    }