/**************************************************************************
*
- * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
+ * Copyright 2007 VMware, Inc.
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* 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
+ * IN NO EVENT SHALL VMWARE 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>
+/* Authors: Keith Whitwell <keithw@vmware.com>
*/
#include "util/u_math.h"
struct twoside_stage {
struct draw_stage stage;
float sign; /**< +1 or -1 */
- uint attrib_front0, attrib_back0;
- uint attrib_front1, attrib_back1;
+ int attrib_front0, attrib_back0;
+ int attrib_front1, attrib_back1;
};
-static INLINE struct twoside_stage *twoside_stage( struct draw_stage *stage )
+static inline struct twoside_stage *twoside_stage( struct draw_stage *stage )
{
return (struct twoside_stage *)stage;
}
-
-
-
/**
* Copy back color(s) to front color(s).
*/
-static INLINE struct vertex_header *
+static inline struct vertex_header *
copy_bfc( struct twoside_stage *twoside,
const struct vertex_header *v,
unsigned idx )
{
struct vertex_header *tmp = dup_vert( &twoside->stage, v, idx );
-
- if (twoside->attrib_back0) {
+
+ if (twoside->attrib_back0 >= 0 && twoside->attrib_front0 >= 0) {
COPY_4FV(tmp->data[twoside->attrib_front0],
tmp->data[twoside->attrib_back0]);
}
- if (twoside->attrib_back1) {
+ if (twoside->attrib_back1 >= 0 && twoside->attrib_front1 >= 0) {
COPY_4FV(tmp->data[twoside->attrib_front1],
tmp->data[twoside->attrib_back1]);
}
const struct draw_vertex_shader *vs = stage->draw->vs.vertex_shader;
uint i;
- twoside->attrib_front0 = 0;
- twoside->attrib_front1 = 0;
- twoside->attrib_back0 = 0;
- twoside->attrib_back1 = 0;
+ twoside->attrib_front0 = -1;
+ twoside->attrib_front1 = -1;
+ twoside->attrib_back0 = -1;
+ twoside->attrib_back1 = -1;
/* Find which vertex shader outputs are front/back colors */
for (i = 0; i < vs->info.num_outputs; i++) {
}
}
- if (!twoside->attrib_back0)
- twoside->attrib_front0 = 0;
-
- if (!twoside->attrib_back1)
- twoside->attrib_front1 = 0;
-
/*
* We'll multiply the primitive's determinant by this sign to determine
* if the triangle is back-facing (negative).
struct draw_stage *draw_twoside_stage( struct draw_context *draw )
{
struct twoside_stage *twoside = CALLOC_STRUCT(twoside_stage);
- if (twoside == NULL)
+ if (!twoside)
goto fail;
twoside->stage.draw = draw;