1 /**************************************************************************
3 * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sub license, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
21 * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
22 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
23 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
24 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
26 **************************************************************************/
28 /* Authors: Keith Whitwell <keith@tungstengraphics.com>
31 #include "main/imports.h"
32 #include "draw_private.h"
35 struct flatshade_stage {
36 struct draw_stage stage;
43 static INLINE struct flatshade_stage *flatshade_stage( struct draw_stage *stage )
45 return (struct flatshade_stage *)stage;
49 static void flatshade_begin( struct draw_stage *stage )
51 stage->next->begin( stage->next );
56 static INLINE void copy_attr( GLuint attr,
57 struct vertex_header *dst,
58 const struct vertex_header *src )
61 memcpy( dst->data[attr],
63 sizeof(src->data[0]) );
68 static INLINE void copy_colors( struct draw_stage *stage,
69 struct vertex_header *dst,
70 const struct vertex_header *src )
72 const struct flatshade_stage *flatshade = flatshade_stage(stage);
73 const GLuint *lookup = flatshade->lookup;
75 copy_attr( lookup[VF_ATTRIB_COLOR0], dst, src );
76 copy_attr( lookup[VF_ATTRIB_COLOR1], dst, src );
77 copy_attr( lookup[VF_ATTRIB_BFC0], dst, src );
78 copy_attr( lookup[VF_ATTRIB_BFC1], dst, src );
83 * Flatshade tri. Required for clipping and when unfilled tris are
84 * active, otherwise handled by hardware.
86 static void flatshade_tri( struct draw_stage *stage,
87 struct prim_header *header )
89 struct prim_header tmp;
91 tmp.det = header->det;
92 tmp.v[0] = dup_vert(stage, header->v[0], 0);
93 tmp.v[1] = dup_vert(stage, header->v[1], 1);
94 tmp.v[2] = header->v[2];
96 copy_colors(stage, tmp.v[0], tmp.v[2]);
97 copy_colors(stage, tmp.v[1], tmp.v[2]);
99 stage->next->tri( stage->next, &tmp );
104 * Flatshade line. Required for clipping.
106 static void flatshade_line( struct draw_stage *stage,
107 struct prim_header *header )
109 struct prim_header tmp;
111 tmp.v[0] = dup_vert(stage, header->v[0], 0);
112 tmp.v[1] = header->v[1];
114 copy_colors(stage, tmp.v[0], tmp.v[1]);
116 stage->next->line( stage->next, &tmp );
120 static void flatshade_point( struct draw_stage *stage,
121 struct prim_header *header )
123 stage->next->point( stage->next, header );
127 static void flatshade_end( struct draw_stage *stage )
129 stage->next->end( stage->next );
133 static void flatshade_reset_stipple_counter( struct draw_stage *stage )
135 stage->next->reset_stipple_counter( stage->next );
140 * Create flatshading drawing stage.
142 struct draw_stage *draw_flatshade_stage( struct draw_context *draw )
144 struct flatshade_stage *flatshade = CALLOC_STRUCT(flatshade_stage);
146 draw_alloc_tmps( &flatshade->stage, 2 );
148 flatshade->stage.draw = draw;
149 flatshade->stage.next = NULL;
150 flatshade->stage.begin = flatshade_begin;
151 flatshade->stage.point = flatshade_point;
152 flatshade->stage.line = flatshade_line;
153 flatshade->stage.tri = flatshade_tri;
154 flatshade->stage.end = flatshade_end;
155 flatshade->stage.reset_stipple_counter = flatshade_reset_stipple_counter;
157 flatshade->lookup = draw->vf_attr_to_slot;
159 return &flatshade->stage;