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
34 static void
upload_clip_state(struct brw_context * brw)35 upload_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 uint32_t nonperspective_barycentric_enable_flag = 0;
42
43 /* CACHE_NEW_WM_PROG */
44 if (brw->wm.prog_data->barycentric_interp_modes &
45 BRW_WM_NONPERSPECTIVE_BARYCENTRIC_BITS) {
46 nonperspective_barycentric_enable_flag =
47 GEN6_CLIP_NON_PERSPECTIVE_BARYCENTRIC_ENABLE;
48 }
49
50 if (!ctx->Transform.DepthClamp)
51 depth_clamp = GEN6_CLIP_Z_TEST;
52
53 /* _NEW_LIGHT */
54 if (ctx->Light.ProvokingVertex == GL_FIRST_VERTEX_CONVENTION) {
55 provoking =
56 (0 << GEN6_CLIP_TRI_PROVOKE_SHIFT) |
57 (1 << GEN6_CLIP_TRIFAN_PROVOKE_SHIFT) |
58 (0 << GEN6_CLIP_LINE_PROVOKE_SHIFT);
59 } else {
60 provoking =
61 (2 << GEN6_CLIP_TRI_PROVOKE_SHIFT) |
62 (2 << GEN6_CLIP_TRIFAN_PROVOKE_SHIFT) |
63 (1 << GEN6_CLIP_LINE_PROVOKE_SHIFT);
64 }
65
66 /* _NEW_TRANSFORM */
67 userclip = ctx->Transform.ClipPlanesEnabled;
68
69 BEGIN_BATCH(4);
70 OUT_BATCH(_3DSTATE_CLIP << 16 | (4 - 2));
71 OUT_BATCH(GEN6_CLIP_STATISTICS_ENABLE);
72 OUT_BATCH(GEN6_CLIP_ENABLE |
73 GEN6_CLIP_API_OGL |
74 GEN6_CLIP_MODE_NORMAL |
75 nonperspective_barycentric_enable_flag |
76 GEN6_CLIP_XY_TEST |
77 userclip << GEN6_USER_CLIP_CLIP_DISTANCES_SHIFT |
78 depth_clamp |
79 provoking);
80 OUT_BATCH(U_FIXED(0.125, 3) << GEN6_CLIP_MIN_POINT_WIDTH_SHIFT |
81 U_FIXED(255.875, 3) << GEN6_CLIP_MAX_POINT_WIDTH_SHIFT |
82 GEN6_CLIP_FORCE_ZERO_RTAINDEX);
83 ADVANCE_BATCH();
84 }
85
86 const struct brw_tracked_state gen6_clip_state = {
87 .dirty = {
88 .mesa = _NEW_TRANSFORM | _NEW_LIGHT,
89 .brw = (BRW_NEW_CONTEXT),
90 .cache = CACHE_NEW_WM_PROG
91 },
92 .emit = upload_clip_state,
93 };
94