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 "pipe/p_util.h"
32 #include "pipe/p_shader_tokens.h"
33 #include "draw_private.h"
36 /** subclass of draw_stage */
39 struct draw_stage stage
;
41 uint num_color_attribs
;
42 uint color_attribs
[4]; /* front/back primary/secondary colors */
46 static INLINE
struct flat_stage
*
47 flat_stage(struct draw_stage
*stage
)
49 return (struct flat_stage
*) stage
;
53 /** Copy all the color attributes from 'src' vertex to 'dst' vertex */
54 static INLINE
void copy_colors( struct draw_stage
*stage
,
55 struct vertex_header
*dst
,
56 const struct vertex_header
*src
)
58 const struct flat_stage
*flat
= flat_stage(stage
);
60 for (i
= 0; i
< flat
->num_color_attribs
; i
++) {
61 const uint attr
= flat
->color_attribs
[i
];
62 COPY_4FV(dst
->data
[attr
], src
->data
[attr
]);
67 /** Copy all the color attributes from src vertex to dst0 & dst1 vertices */
68 static INLINE
void copy_colors2( struct draw_stage
*stage
,
69 struct vertex_header
*dst0
,
70 struct vertex_header
*dst1
,
71 const struct vertex_header
*src
)
73 const struct flat_stage
*flat
= flat_stage(stage
);
75 for (i
= 0; i
< flat
->num_color_attribs
; i
++) {
76 const uint attr
= flat
->color_attribs
[i
];
77 COPY_4FV(dst0
->data
[attr
], src
->data
[attr
]);
78 COPY_4FV(dst1
->data
[attr
], src
->data
[attr
]);
84 * Flatshade tri. Required for clipping and when unfilled tris are
85 * active, otherwise handled by hardware.
87 static void flatshade_tri( struct draw_stage
*stage
,
88 struct prim_header
*header
)
90 struct prim_header tmp
;
92 tmp
.det
= header
->det
;
93 tmp
.edgeflags
= header
->edgeflags
;
94 tmp
.v
[0] = dup_vert(stage
, header
->v
[0], 0);
95 tmp
.v
[1] = dup_vert(stage
, header
->v
[1], 1);
96 tmp
.v
[2] = header
->v
[2];
98 copy_colors2(stage
, tmp
.v
[0], tmp
.v
[1], tmp
.v
[2]);
100 stage
->next
->tri( stage
->next
, &tmp
);
105 * Flatshade line. Required for clipping.
107 static void flatshade_line( struct draw_stage
*stage
,
108 struct prim_header
*header
)
110 struct prim_header tmp
;
112 tmp
.v
[0] = dup_vert(stage
, header
->v
[0], 0);
113 tmp
.v
[1] = header
->v
[1];
115 copy_colors(stage
, tmp
.v
[0], tmp
.v
[1]);
117 stage
->next
->line( stage
->next
, &tmp
);
121 static void flatshade_point( struct draw_stage
*stage
,
122 struct prim_header
*header
)
124 stage
->next
->point( stage
->next
, header
);
128 static void flatshade_init_state( struct draw_stage
*stage
)
130 struct flat_stage
*flat
= flat_stage(stage
);
131 const struct draw_vertex_shader
*vs
= stage
->draw
->vertex_shader
;
134 /* Find which vertex shader outputs are colors, make a list */
135 flat
->num_color_attribs
= 0;
136 for (i
= 0; i
< vs
->info
.num_outputs
; i
++) {
137 if (vs
->info
.output_semantic_name
[i
] == TGSI_SEMANTIC_COLOR
||
138 vs
->info
.output_semantic_name
[i
] == TGSI_SEMANTIC_BCOLOR
) {
139 flat
->color_attribs
[flat
->num_color_attribs
++] = i
;
143 stage
->line
= flatshade_line
;
144 stage
->tri
= flatshade_tri
;
147 static void flatshade_first_tri( struct draw_stage
*stage
,
148 struct prim_header
*header
)
150 flatshade_init_state( stage
);
151 stage
->tri( stage
, header
);
154 static void flatshade_first_line( struct draw_stage
*stage
,
155 struct prim_header
*header
)
157 flatshade_init_state( stage
);
158 stage
->line( stage
, header
);
162 static void flatshade_flush( struct draw_stage
*stage
,
165 stage
->tri
= flatshade_first_tri
;
166 stage
->line
= flatshade_first_line
;
167 stage
->next
->flush( stage
->next
, flags
);
171 static void flatshade_reset_stipple_counter( struct draw_stage
*stage
)
173 stage
->next
->reset_stipple_counter( stage
->next
);
177 static void flatshade_destroy( struct draw_stage
*stage
)
179 draw_free_temp_verts( stage
);
185 * Create flatshading drawing stage.
187 struct draw_stage
*draw_flatshade_stage( struct draw_context
*draw
)
189 struct flat_stage
*flatshade
= CALLOC_STRUCT(flat_stage
);
191 draw_alloc_temp_verts( &flatshade
->stage
, 2 );
193 flatshade
->stage
.draw
= draw
;
194 flatshade
->stage
.next
= NULL
;
195 flatshade
->stage
.point
= flatshade_point
;
196 flatshade
->stage
.line
= flatshade_first_line
;
197 flatshade
->stage
.tri
= flatshade_first_tri
;
198 flatshade
->stage
.flush
= flatshade_flush
;
199 flatshade
->stage
.reset_stipple_counter
= flatshade_reset_stipple_counter
;
200 flatshade
->stage
.destroy
= flatshade_destroy
;
202 return &flatshade
->stage
;