2 * Copyright © 2009 Intel Corporation
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
24 * Eric Anholt <eric@anholt.net>
28 #include "brw_context.h"
29 #include "brw_state.h"
30 #include "brw_defines.h"
32 #include "intel_batchbuffer.h"
35 brw_compute_userclip_flags(bool uses_clip_distance
,
36 GLbitfield clip_planes_enabled
)
38 if (uses_clip_distance
) {
39 /* When using gl_ClipDistance, it is up to the shader to decide which
40 * clip distance values to use.
42 return clip_planes_enabled
;
44 /* When using clipping planes, we compact the ones that are in use so
45 * that they are always numbered consecutively from zero, so we need to
46 * enable clipping planes 0 through n-1 in the hardware regardless of
47 * which planes the user has selected.
49 return (1 << _mesa_bitcount_64(clip_planes_enabled
)) - 1;
54 upload_clip_state(struct brw_context
*brw
)
56 struct intel_context
*intel
= &brw
->intel
;
57 struct gl_context
*ctx
= &intel
->ctx
;
58 uint32_t depth_clamp
= 0;
59 uint32_t provoking
, userclip
;
61 /* BRW_NEW_VERTEX_PROGRAM */
62 struct brw_vertex_program
*vp
=
63 (struct brw_vertex_program
*)brw
->vertex_program
;
65 if (!ctx
->Transform
.DepthClamp
)
66 depth_clamp
= GEN6_CLIP_Z_TEST
;
69 if (ctx
->Light
.ProvokingVertex
== GL_FIRST_VERTEX_CONVENTION
) {
71 (0 << GEN6_CLIP_TRI_PROVOKE_SHIFT
) |
72 (1 << GEN6_CLIP_TRIFAN_PROVOKE_SHIFT
) |
73 (0 << GEN6_CLIP_LINE_PROVOKE_SHIFT
);
76 (2 << GEN6_CLIP_TRI_PROVOKE_SHIFT
) |
77 (2 << GEN6_CLIP_TRIFAN_PROVOKE_SHIFT
) |
78 (1 << GEN6_CLIP_LINE_PROVOKE_SHIFT
);
82 userclip
= brw_compute_userclip_flags(vp
->program
.UsesClipDistance
,
83 ctx
->Transform
.ClipPlanesEnabled
);
86 OUT_BATCH(_3DSTATE_CLIP
<< 16 | (4 - 2));
87 OUT_BATCH(GEN6_CLIP_STATISTICS_ENABLE
);
88 OUT_BATCH(GEN6_CLIP_ENABLE
|
90 GEN6_CLIP_MODE_NORMAL
|
92 userclip
<< GEN6_USER_CLIP_CLIP_DISTANCES_SHIFT
|
95 OUT_BATCH(U_FIXED(0.125, 3) << GEN6_CLIP_MIN_POINT_WIDTH_SHIFT
|
96 U_FIXED(255.875, 3) << GEN6_CLIP_MAX_POINT_WIDTH_SHIFT
|
97 GEN6_CLIP_FORCE_ZERO_RTAINDEX
);
101 const struct brw_tracked_state gen6_clip_state
= {
103 .mesa
= _NEW_TRANSFORM
| _NEW_LIGHT
,
104 .brw
= BRW_NEW_CONTEXT
| BRW_NEW_VERTEX_PROGRAM
,
107 .emit
= upload_clip_state
,