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
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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 **************************************************************************/
29 * \brief polygon stipple state
36 #include "st_context.h"
38 #include "pipe/p_context.h"
39 #include "pipe/p_defines.h"
43 * OpenGL's polygon stipple is indexed with window coordinates in which
44 * the origin (0,0) is the lower-left corner of the window.
45 * With Gallium, the origin is the upper-left corner of the window.
46 * To convert GL's polygon stipple to what gallium expects we need to
47 * invert the pattern vertically and rotate the stipple rows according
48 * to the window height.
51 invert_stipple(GLuint dest
[32], const GLuint src
[32], GLuint winHeight
)
55 for (i
= 0; i
< 32; i
++) {
56 dest
[i
] = src
[(winHeight
- 1 - i
) & 0x1f];
63 update_stipple( struct st_context
*st
)
65 const GLuint sz
= sizeof(st
->state
.poly_stipple
);
66 assert(sz
== sizeof(st
->ctx
->PolygonStipple
));
68 if (memcmp(st
->state
.poly_stipple
, st
->ctx
->PolygonStipple
, sz
)) {
69 /* state has changed */
70 struct pipe_poly_stipple newStipple
;
72 memcpy(st
->state
.poly_stipple
, st
->ctx
->PolygonStipple
, sz
);
74 invert_stipple(newStipple
.stipple
, st
->ctx
->PolygonStipple
,
75 st
->ctx
->DrawBuffer
->Height
);
77 st
->pipe
->set_polygon_stipple(st
->pipe
, &newStipple
);
82 /** Update the stipple when the pattern or window height changes */
83 const struct st_tracked_state st_update_polygon_stipple
= {
84 "st_update_polygon_stipple", /* name */
86 (_NEW_POLYGONSTIPPLE
|
87 _NEW_BUFFERS
), /* mesa */
90 update_stipple
/* update */