brw_clip_state.c revision 82eb7c235db9939d067c4d64e32df96caef939ab 
1/*
2 Copyright (C) Intel Corp.  2006.  All Rights Reserved.
3 Intel funded Tungsten Graphics (http://www.tungstengraphics.com) to
4 develop this 3D driver.
5
6 Permission is hereby granted, free of charge, to any person obtaining
7 a 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, sublicense, 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:
13
14 The above copyright notice and this permission notice (including the
15 next paragraph) shall be included in all copies or substantial
16 portions of the Software.
17
18 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
19 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
21 IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
22 LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
23 OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
24 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
25
26 **********************************************************************/
27 /*
28  * Authors:
29  *   Keith Whitwell <keith@tungstengraphics.com>
30  */
31
32#include "brw_context.h"
33#include "brw_state.h"
34#include "brw_defines.h"
35#include "main/macros.h"
36
37struct brw_clip_unit_key {
38   unsigned int total_grf;
39   unsigned int urb_entry_read_length;
40   unsigned int curb_entry_read_length;
41   unsigned int clip_mode;
42
43   unsigned int curbe_offset;
44
45   unsigned int nr_urb_entries, urb_size;
46};
47
48static void
49clip_unit_populate_key(struct brw_context *brw, struct brw_clip_unit_key *key)
50{
51   memset(key, 0, sizeof(*key));
52
53   /* CACHE_NEW_CLIP_PROG */
54   key->total_grf = brw->clip.prog_data->total_grf;
55   key->urb_entry_read_length = brw->clip.prog_data->urb_read_length;
56   key->curb_entry_read_length = brw->clip.prog_data->curb_read_length;
57   key->clip_mode = brw->clip.prog_data->clip_mode;
58
59   /* BRW_NEW_CURBE_OFFSETS */
60   key->curbe_offset = brw->curbe.clip_start;
61
62   /* BRW_NEW_URB_FENCE */
63   key->nr_urb_entries = brw->urb.nr_clip_entries;
64   key->urb_size = brw->urb.vsize;
65}
66
67static dri_bo *
68clip_unit_create_from_key(struct brw_context *brw,
69			  struct brw_clip_unit_key *key)
70{
71   struct brw_clip_unit_state clip;
72   dri_bo *bo;
73
74   memset(&clip, 0, sizeof(clip));
75
76   clip.thread0.grf_reg_count = ALIGN(key->total_grf, 16) / 16 - 1;
77   /* reloc */
78   clip.thread0.kernel_start_pointer = brw->clip.prog_bo->offset >> 6;
79
80   clip.thread1.floating_point_mode = BRW_FLOATING_POINT_NON_IEEE_754;
81   clip.thread1.single_program_flow = 1;
82
83   clip.thread3.urb_entry_read_length = key->urb_entry_read_length;
84   clip.thread3.const_urb_entry_read_length = key->curb_entry_read_length;
85   clip.thread3.const_urb_entry_read_offset = key->curbe_offset * 2;
86   clip.thread3.dispatch_grf_start_reg = 1;
87   clip.thread3.urb_entry_read_offset = 0;
88
89   clip.thread4.nr_urb_entries = key->nr_urb_entries;
90   clip.thread4.urb_entry_allocation_size = key->urb_size - 1;
91   /* If we have enough clip URB entries to run two threads, do so.
92    */
93   if (key->nr_urb_entries >= 10) {
94      /* Half of the URB entries go to each thread, and it has to be an
95       * even number.
96       */
97      assert(key->nr_urb_entries % 2 == 0);
98      clip.thread4.max_threads = 2 - 1;
99   } else {
100      assert(key->nr_urb_entries >= 5);
101      clip.thread4.max_threads = 1 - 1;
102   }
103
104   if (INTEL_DEBUG & DEBUG_SINGLE_THREAD)
105      clip.thread4.max_threads = 0;
106
107   if (INTEL_DEBUG & DEBUG_STATS)
108      clip.thread4.stats_enable = 1;
109
110   clip.clip5.userclip_enable_flags = 0x7f;
111   clip.clip5.userclip_must_clip = 1;
112   clip.clip5.guard_band_enable = 0;
113   clip.clip5.viewport_z_clip_enable = 1;
114   clip.clip5.viewport_xy_clip_enable = 1;
115   clip.clip5.vertex_position_space = BRW_CLIP_NDCSPACE;
116   clip.clip5.api_mode = BRW_CLIP_API_OGL;
117   clip.clip5.clip_mode = key->clip_mode;
118
119   if (BRW_IS_G4X(brw))
120      clip.clip5.negative_w_clip_test = 1;
121
122   clip.clip6.clipper_viewport_state_ptr = 0;
123   clip.viewport_xmin = -1;
124   clip.viewport_xmax = 1;
125   clip.viewport_ymin = -1;
126   clip.viewport_ymax = 1;
127
128   bo = brw_upload_cache(&brw->cache, BRW_CLIP_UNIT,
129			 key, sizeof(*key),
130			 &brw->clip.prog_bo, 1,
131			 &clip, sizeof(clip),
132			 NULL, NULL);
133
134   /* Emit clip program relocation */
135   assert(brw->clip.prog_bo);
136   dri_bo_emit_reloc(bo,
137		     I915_GEM_DOMAIN_INSTRUCTION,
138		     0,
139		     clip.thread0.grf_reg_count << 1,
140		     offsetof(struct brw_clip_unit_state, thread0),
141		     brw->clip.prog_bo);
142
143   return bo;
144}
145
146static void upload_clip_unit( struct brw_context *brw )
147{
148   struct brw_clip_unit_key key;
149
150   clip_unit_populate_key(brw, &key);
151
152   dri_bo_unreference(brw->clip.state_bo);
153   brw->clip.state_bo = brw_search_cache(&brw->cache, BRW_CLIP_UNIT,
154					 &key, sizeof(key),
155					 &brw->clip.prog_bo, 1,
156					 NULL);
157   if (brw->clip.state_bo == NULL) {
158      brw->clip.state_bo = clip_unit_create_from_key(brw, &key);
159   }
160}
161
162const struct brw_tracked_state brw_clip_unit = {
163   .dirty = {
164      .mesa  = 0,
165      .brw   = (BRW_NEW_CURBE_OFFSETS |
166		BRW_NEW_URB_FENCE),
167      .cache = CACHE_NEW_CLIP_PROG
168   },
169   .prepare = upload_clip_unit,
170};
171