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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.
*
**************************************************************************/
/**
* \brief Drawing stage for handling glPolygonMode(line/point).
* Convert triangles to points or lines as needed.
*/
/* Authors: Keith Whitwell <keith@tungstengraphics.com>
*/
#include "pipe/p_util.h"
#include "pipe/p_defines.h"
#include "draw_private.h"
struct unfilled_stage {
struct draw_stage stage;
/** [0] = front face, [1] = back face.
* legal values: PIPE_POLYGON_MODE_FILL, PIPE_POLYGON_MODE_LINE,
* and PIPE_POLYGON_MODE_POINT,
*/
unsigned mode[2];
};
static INLINE struct unfilled_stage *unfilled_stage( struct draw_stage *stage )
{
return (struct unfilled_stage *)stage;
}
static void point( struct draw_stage *stage,
struct vertex_header *v0 )
{
struct prim_header tmp;
tmp.v[0] = v0;
stage->next->point( stage->next, &tmp );
}
static void line( struct draw_stage *stage,
struct vertex_header *v0,
struct vertex_header *v1 )
{
struct prim_header tmp;
tmp.v[0] = v0;
tmp.v[1] = v1;
stage->next->line( stage->next, &tmp );
}
static void points( struct draw_stage *stage,
struct prim_header *header )
{
struct vertex_header *v0 = header->v[0];
struct vertex_header *v1 = header->v[1];
struct vertex_header *v2 = header->v[2];
if (header->edgeflags & 0x1) point( stage, v0 );
if (header->edgeflags & 0x2) point( stage, v1 );
if (header->edgeflags & 0x4) point( stage, v2 );
}
static void lines( struct draw_stage *stage,
struct prim_header *header )
{
struct vertex_header *v0 = header->v[0];
struct vertex_header *v1 = header->v[1];
struct vertex_header *v2 = header->v[2];
#if 0
assert(((header->edgeflags & 0x1) >> 0) == header->v[0]->edgeflag);
assert(((header->edgeflags & 0x2) >> 1) == header->v[1]->edgeflag);
assert(((header->edgeflags & 0x4) >> 2) == header->v[2]->edgeflag);
#endif
if (header->edgeflags & 0x1) line( stage, v0, v1 );
if (header->edgeflags & 0x2) line( stage, v1, v2 );
if (header->edgeflags & 0x4) line( stage, v2, v0 );
}
/* Unfilled tri:
*
* Note edgeflags in the vertex struct is not sufficient as we will
* need to manipulate them when decomposing primitives???
*/
static void unfilled_tri( struct draw_stage *stage,
struct prim_header *header )
{
struct unfilled_stage *unfilled = unfilled_stage(stage);
unsigned mode = unfilled->mode[header->det >= 0.0];
switch (mode) {
case PIPE_POLYGON_MODE_FILL:
stage->next->tri( stage->next, header );
break;
case PIPE_POLYGON_MODE_LINE:
lines( stage, header );
break;
case PIPE_POLYGON_MODE_POINT:
points( stage, header );
break;
default:
abort();
}
}
static void unfilled_first_tri( struct draw_stage *stage,
struct prim_header *header )
{
struct unfilled_stage *unfilled = unfilled_stage(stage);
unfilled->mode[0] = stage->draw->rasterizer->fill_ccw; /* front */
unfilled->mode[1] = stage->draw->rasterizer->fill_cw; /* back */
stage->tri = unfilled_tri;
stage->tri( stage, header );
}
static void unfilled_line( struct draw_stage *stage,
struct prim_header *header )
{
stage->next->line( stage->next, header );
}
static void unfilled_point( struct draw_stage *stage,
struct prim_header *header )
{
stage->next->point( stage->next, header );
}
static void unfilled_flush( struct draw_stage *stage,
unsigned flags )
{
stage->next->flush( stage->next, flags );
stage->tri = unfilled_first_tri;
}
static void unfilled_reset_stipple_counter( struct draw_stage *stage )
{
stage->next->reset_stipple_counter( stage->next );
}
static void unfilled_destroy( struct draw_stage *stage )
{
draw_free_temp_verts( stage );
FREE( stage );
}
/**
* Create unfilled triangle stage.
*/
struct draw_stage *draw_unfilled_stage( struct draw_context *draw )
{
struct unfilled_stage *unfilled = CALLOC_STRUCT(unfilled_stage);
draw_alloc_temp_verts( &unfilled->stage, 0 );
unfilled->stage.draw = draw;
unfilled->stage.next = NULL;
unfilled->stage.tmp = NULL;
unfilled->stage.point = unfilled_point;
unfilled->stage.line = unfilled_line;
unfilled->stage.tri = unfilled_first_tri;
unfilled->stage.flush = unfilled_flush;
unfilled->stage.reset_stipple_counter = unfilled_reset_stipple_counter;
unfilled->stage.destroy = unfilled_destroy;
return &unfilled->stage;
}
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