227 lines
6.3 KiB
C
227 lines
6.3 KiB
C
/**************************************************************************
|
|
*
|
|
* 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 "util/u_memory.h"
|
|
#include "pipe/p_defines.h"
|
|
#include "draw_private.h"
|
|
#include "draw_pipe.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->flags & DRAW_PIPE_EDGE_FLAG_0) && v0->edgeflag) point( stage, v0 );
|
|
if ((header->flags & DRAW_PIPE_EDGE_FLAG_1) && v1->edgeflag) point( stage, v1 );
|
|
if ((header->flags & DRAW_PIPE_EDGE_FLAG_2) && v2->edgeflag) 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 (header->flags & DRAW_PIPE_RESET_STIPPLE)
|
|
stage->next->reset_stipple_counter( stage->next );
|
|
|
|
if ((header->flags & DRAW_PIPE_EDGE_FLAG_2) && v2->edgeflag) line( stage, v2, v0 );
|
|
if ((header->flags & DRAW_PIPE_EDGE_FLAG_0) && v0->edgeflag) line( stage, v0, v1 );
|
|
if ((header->flags & DRAW_PIPE_EDGE_FLAG_1) && v1->edgeflag) line( stage, v1, v2 );
|
|
}
|
|
|
|
|
|
/** For debugging */
|
|
static void
|
|
print_header_flags(unsigned flags)
|
|
{
|
|
debug_printf("header->flags = ");
|
|
if (flags & DRAW_PIPE_RESET_STIPPLE)
|
|
debug_printf("RESET_STIPPLE ");
|
|
if (flags & DRAW_PIPE_EDGE_FLAG_0)
|
|
debug_printf("EDGE_FLAG_0 ");
|
|
if (flags & DRAW_PIPE_EDGE_FLAG_1)
|
|
debug_printf("EDGE_FLAG_1 ");
|
|
if (flags & DRAW_PIPE_EDGE_FLAG_2)
|
|
debug_printf("EDGE_FLAG_2 ");
|
|
debug_printf("\n");
|
|
}
|
|
|
|
|
|
/* Unfilled tri:
|
|
*
|
|
* Note edgeflags in the vertex struct is not sufficient as we will
|
|
* need to manipulate them when decomposing primitives.
|
|
*
|
|
* We currently keep the vertex edgeflag and primitive edgeflag mask
|
|
* separate until the last possible moment.
|
|
*/
|
|
static void unfilled_tri( struct draw_stage *stage,
|
|
struct prim_header *header )
|
|
{
|
|
struct unfilled_stage *unfilled = unfilled_stage(stage);
|
|
unsigned cw = header->det >= 0.0;
|
|
unsigned mode = unfilled->mode[cw];
|
|
|
|
if (0)
|
|
print_header_flags(header->flags);
|
|
|
|
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:
|
|
assert(0);
|
|
}
|
|
}
|
|
|
|
|
|
static void unfilled_first_tri( struct draw_stage *stage,
|
|
struct prim_header *header )
|
|
{
|
|
struct unfilled_stage *unfilled = unfilled_stage(stage);
|
|
const struct pipe_rasterizer_state *rast = stage->draw->rasterizer;
|
|
|
|
unfilled->mode[0] = rast->front_ccw ? rast->fill_front : rast->fill_back;
|
|
unfilled->mode[1] = rast->front_ccw ? rast->fill_back : rast->fill_front;
|
|
|
|
stage->tri = unfilled_tri;
|
|
stage->tri( stage, 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);
|
|
if (unfilled == NULL)
|
|
goto fail;
|
|
|
|
unfilled->stage.draw = draw;
|
|
unfilled->stage.name = "unfilled";
|
|
unfilled->stage.next = NULL;
|
|
unfilled->stage.tmp = NULL;
|
|
unfilled->stage.point = draw_pipe_passthrough_point;
|
|
unfilled->stage.line = draw_pipe_passthrough_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;
|
|
|
|
if (!draw_alloc_temp_verts( &unfilled->stage, 0 ))
|
|
goto fail;
|
|
|
|
return &unfilled->stage;
|
|
|
|
fail:
|
|
if (unfilled)
|
|
unfilled->stage.destroy( &unfilled->stage );
|
|
|
|
return NULL;
|
|
}
|