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/**************************************************************************
*
* Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sub license, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portions
* of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
* IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
**************************************************************************/
/*
* Authors:
* Keith Whitwell <keith@tungstengraphics.com>
*/
#include "draw/draw_pt.h"
#include "draw/draw_private.h"
/* Neat get_elt func that also works for varrays drawing by encoding
* the start value into a pointer.
*/
static unsigned elt_uint( const void *elts, unsigned idx )
{
return *(((const uint *)elts) + idx);
}
static unsigned elt_ushort( const void *elts, unsigned idx )
{
return *(((const ushort *)elts) + idx);
}
static unsigned elt_ubyte( const void *elts, unsigned idx )
{
return *(((const ubyte *)elts) + idx);
}
static unsigned elt_vert( const void *elts, unsigned idx )
{
/* unsigned index is packed in the pointer */
return (unsigned)(uintptr_t)elts + idx;
}
pt_elt_func draw_pt_elt_func( struct draw_context *draw )
{
switch (draw->pt.user.eltSize) {
case 0: return &elt_vert;
case 1: return &elt_ubyte;
case 2: return &elt_ushort;
case 4: return &elt_uint;
default: return NULL;
}
}
const void *draw_pt_elt_ptr( struct draw_context *draw,
unsigned start )
{
const char *elts = draw->pt.user.elts;
switch (draw->pt.user.eltSize) {
case 0:
return (const void *)(((const ubyte *)NULL) + start);
case 1:
return (const void *)(((const ubyte *)elts) + start);
case 2:
return (const void *)(((const ushort *)elts) + start);
case 4:
return (const void *)(((const uint *)elts) + start);
default:
return NULL;
}
}
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