gen6_clip_state.c revision 2595589f1df351895bc5b1a92f19e995a19da15b 
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 "intel_batchbuffer.h"
32
33static void
34upload_clip_state(struct brw_context *brw)
35{
36   struct intel_context *intel = &brw->intel;
37   struct gl_context *ctx = &intel->ctx;
38   uint32_t depth_clamp = 0;
39   uint32_t provoking;
40
41   if (!ctx->Transform.DepthClamp)
42      depth_clamp = GEN6_CLIP_Z_TEST;
43
44   if (ctx->Light.ProvokingVertex == GL_FIRST_VERTEX_CONVENTION) {
45      provoking = 0;
46   } else {
47      provoking =
48	 (2 << GEN6_CLIP_TRI_PROVOKE_SHIFT) |
49	 (2 << GEN6_CLIP_TRIFAN_PROVOKE_SHIFT) |
50	 (1 << GEN6_CLIP_LINE_PROVOKE_SHIFT);
51   }
52
53   BEGIN_BATCH(4);
54   OUT_BATCH(CMD_3D_CLIP_STATE << 16 | (4 - 2));
55   OUT_BATCH(GEN6_CLIP_STATISTICS_ENABLE);
56   OUT_BATCH(GEN6_CLIP_ENABLE |
57	     GEN6_CLIP_API_OGL |
58	     GEN6_CLIP_MODE_NORMAL |
59	     GEN6_CLIP_XY_TEST |
60	     depth_clamp |
61	     provoking);
62   OUT_BATCH(GEN6_CLIP_FORCE_ZERO_RTAINDEX);
63   ADVANCE_BATCH();
64}
65
66const struct brw_tracked_state gen6_clip_state = {
67   .dirty = {
68      .mesa  = _NEW_TRANSFORM,
69      .brw   = BRW_NEW_CONTEXT,
70      .cache = 0
71   },
72   .emit = upload_clip_state,
73};
74