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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 "pipe/p_util.h"
#include "draw_private.h"
struct flatshade_stage {
struct draw_stage stage;
const unsigned *lookup;
};
static INLINE struct flatshade_stage *flatshade_stage( struct draw_stage *stage )
{
return (struct flatshade_stage *)stage;
}
static void flatshade_begin( struct draw_stage *stage )
{
stage->next->begin( stage->next );
}
static INLINE void copy_attr( unsigned attr,
struct vertex_header *dst,
const struct vertex_header *src )
{
if (attr) {
memcpy( dst->data[attr],
src->data[attr],
sizeof(src->data[0]) );
}
}
static INLINE void copy_colors( struct draw_stage *stage,
struct vertex_header *dst,
const struct vertex_header *src )
{
const struct flatshade_stage *flatshade = flatshade_stage(stage);
const unsigned *lookup = flatshade->lookup;
copy_attr( lookup[VF_ATTRIB_COLOR0], dst, src );
copy_attr( lookup[VF_ATTRIB_COLOR1], dst, src );
copy_attr( lookup[VF_ATTRIB_BFC0], dst, src );
copy_attr( lookup[VF_ATTRIB_BFC1], dst, src );
}
/**
* Flatshade tri. Required for clipping and when unfilled tris are
* active, otherwise handled by hardware.
*/
static void flatshade_tri( struct draw_stage *stage,
struct prim_header *header )
{
struct prim_header tmp;
tmp.det = header->det;
tmp.v[0] = dup_vert(stage, header->v[0], 0);
tmp.v[1] = dup_vert(stage, header->v[1], 1);
tmp.v[2] = header->v[2];
copy_colors(stage, tmp.v[0], tmp.v[2]);
copy_colors(stage, tmp.v[1], tmp.v[2]);
stage->next->tri( stage->next, &tmp );
}
/**
* Flatshade line. Required for clipping.
*/
static void flatshade_line( struct draw_stage *stage,
struct prim_header *header )
{
struct prim_header tmp;
tmp.v[0] = dup_vert(stage, header->v[0], 0);
tmp.v[1] = header->v[1];
copy_colors(stage, tmp.v[0], tmp.v[1]);
stage->next->line( stage->next, &tmp );
}
static void flatshade_point( struct draw_stage *stage,
struct prim_header *header )
{
stage->next->point( stage->next, header );
}
static void flatshade_end( struct draw_stage *stage )
{
stage->next->end( stage->next );
}
static void flatshade_reset_stipple_counter( struct draw_stage *stage )
{
stage->next->reset_stipple_counter( stage->next );
}
/**
* Create flatshading drawing stage.
*/
struct draw_stage *draw_flatshade_stage( struct draw_context *draw )
{
struct flatshade_stage *flatshade = CALLOC_STRUCT(flatshade_stage);
draw_alloc_tmps( &flatshade->stage, 2 );
flatshade->stage.draw = draw;
flatshade->stage.next = NULL;
flatshade->stage.begin = flatshade_begin;
flatshade->stage.point = flatshade_point;
flatshade->stage.line = flatshade_line;
flatshade->stage.tri = flatshade_tri;
flatshade->stage.end = flatshade_end;
flatshade->stage.reset_stipple_counter = flatshade_reset_stipple_counter;
flatshade->lookup = draw->vf_attr_to_slot;
return &flatshade->stage;
}
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