gen6_clip_state.c revision 018ea68d8780ab5baeef0b8122b8410e5e55ae6d 
1/*
2 * Copyright © 2009 Intel Corporation
3 *
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:
10 *
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
13 * Software.
14 *
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
21 * IN THE SOFTWARE.
22 *
23 * Authors:
24 *    Eric Anholt <eric@anholt.net>
25 *
26 */
27
28#include "brw_context.h"
29#include "brw_state.h"
30#include "brw_defines.h"
31#include "brw_util.h"
32#include "intel_batchbuffer.h"
33
34static void
35upload_clip_state(struct brw_context *brw)
36{
37   struct intel_context *intel = &brw->intel;
38   struct gl_context *ctx = &intel->ctx;
39   uint32_t depth_clamp = 0;
40   uint32_t provoking, userclip;
41
42   if (!ctx->Transform.DepthClamp)
43      depth_clamp = GEN6_CLIP_Z_TEST;
44
45   /* _NEW_LIGHT */
46   if (ctx->Light.ProvokingVertex == GL_FIRST_VERTEX_CONVENTION) {
47      provoking =
48	 (0 << GEN6_CLIP_TRI_PROVOKE_SHIFT) |
49	 (1 << GEN6_CLIP_TRIFAN_PROVOKE_SHIFT) |
50	 (0 << GEN6_CLIP_LINE_PROVOKE_SHIFT);
51   } else {
52      provoking =
53	 (2 << GEN6_CLIP_TRI_PROVOKE_SHIFT) |
54	 (2 << GEN6_CLIP_TRIFAN_PROVOKE_SHIFT) |
55	 (1 << GEN6_CLIP_LINE_PROVOKE_SHIFT);
56   }
57
58   /* _NEW_TRANSFORM */
59   userclip = ctx->Transform.ClipPlanesEnabled;
60
61   BEGIN_BATCH(4);
62   OUT_BATCH(_3DSTATE_CLIP << 16 | (4 - 2));
63   OUT_BATCH(GEN6_CLIP_STATISTICS_ENABLE);
64   OUT_BATCH(GEN6_CLIP_ENABLE |
65	     GEN6_CLIP_API_OGL |
66	     GEN6_CLIP_MODE_NORMAL |
67	     GEN6_CLIP_XY_TEST |
68	     userclip << GEN6_USER_CLIP_CLIP_DISTANCES_SHIFT |
69	     depth_clamp |
70	     provoking);
71   OUT_BATCH(U_FIXED(0.125, 3) << GEN6_CLIP_MIN_POINT_WIDTH_SHIFT |
72             U_FIXED(255.875, 3) << GEN6_CLIP_MAX_POINT_WIDTH_SHIFT |
73             GEN6_CLIP_FORCE_ZERO_RTAINDEX);
74   ADVANCE_BATCH();
75}
76
77const struct brw_tracked_state gen6_clip_state = {
78   .dirty = {
79      .mesa  = _NEW_TRANSFORM | _NEW_LIGHT,
80      .brw   = BRW_NEW_CONTEXT,
81      .cache = 0
82   },
83   .emit = upload_clip_state,
84};
85