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
33#include "main/mtypes.h"
34#include "brw_wm.h"
35
36
37#undef P			/* prompted depth */
38#undef C			/* computed */
39#undef N			/* non-promoted? */
40
41#define P 0
42#define C 1
43#define N 2
44
45const struct {
46   GLuint mode:2;
47   GLuint sd_present:1;
48   GLuint sd_to_rt:1;
49   GLuint dd_present:1;
50   GLuint ds_present:1;
51} wm_iz_table[IZ_BIT_MAX] =
52{
53 { P, 0, 0, 0, 0 },
54 { P, 0, 0, 0, 0 },
55 { P, 0, 0, 0, 0 },
56 { P, 0, 0, 0, 0 },
57 { P, 0, 0, 0, 0 },
58 { N, 1, 1, 0, 0 },
59 { N, 0, 1, 0, 0 },
60 { N, 0, 1, 0, 0 },
61 { P, 0, 0, 0, 0 },
62 { P, 0, 0, 0, 0 },
63 { C, 0, 1, 1, 0 },
64 { C, 0, 1, 1, 0 },
65 { P, 0, 0, 0, 0 },
66 { N, 1, 1, 0, 0 },
67 { C, 0, 1, 1, 0 },
68 { C, 0, 1, 1, 0 },
69 { P, 0, 0, 0, 0 },
70 { P, 0, 0, 0, 0 },
71 { P, 0, 0, 0, 0 },
72 { P, 0, 0, 0, 0 },
73 { P, 0, 0, 0, 0 },
74 { N, 1, 1, 0, 0 },
75 { N, 0, 1, 0, 0 },
76 { N, 0, 1, 0, 0 },
77 { P, 0, 0, 0, 0 },
78 { P, 0, 0, 0, 0 },
79 { C, 0, 1, 1, 0 },
80 { C, 0, 1, 1, 0 },
81 { P, 0, 0, 0, 0 },
82 { N, 1, 1, 0, 0 },
83 { C, 0, 1, 1, 0 },
84 { C, 0, 1, 1, 0 },
85 { P, 0, 0, 0, 0 },
86 { P, 0, 0, 0, 0 },
87 { P, 0, 0, 0, 0 },
88 { P, 0, 0, 0, 0 },
89 { P, 0, 0, 0, 0 },
90 { N, 1, 1, 0, 1 },
91 { N, 0, 1, 0, 1 },
92 { N, 0, 1, 0, 1 },
93 { P, 0, 0, 0, 0 },
94 { P, 0, 0, 0, 0 },
95 { C, 0, 1, 1, 1 },
96 { C, 0, 1, 1, 1 },
97 { P, 0, 0, 0, 0 },
98 { N, 1, 1, 0, 1 },
99 { C, 0, 1, 1, 1 },
100 { C, 0, 1, 1, 1 },
101 { P, 0, 0, 0, 0 },
102 { C, 0, 0, 0, 1 },
103 { P, 0, 0, 0, 0 },
104 { C, 0, 1, 0, 1 },
105 { P, 0, 0, 0, 0 },
106 { C, 1, 1, 0, 1 },
107 { C, 0, 1, 0, 1 },
108 { C, 0, 1, 0, 1 },
109 { P, 0, 0, 0, 0 },
110 { C, 1, 1, 1, 1 },
111 { C, 0, 1, 1, 1 },
112 { C, 0, 1, 1, 1 },
113 { P, 0, 0, 0, 0 },
114 { C, 1, 1, 1, 1 },
115 { C, 0, 1, 1, 1 },
116 { C, 0, 1, 1, 1 }
117};
118
119/**
120 * \param line_aa  AA_NEVER, AA_ALWAYS or AA_SOMETIMES
121 * \param lookup  bitmask of IZ_* flags
122 */
123void brw_wm_lookup_iz(struct intel_context *intel,
124		      struct brw_wm_compile *c)
125{
126   GLuint reg = 2;
127   bool kill_stats_promoted_workaround = false;
128   int lookup = c->key.iz_lookup;
129   bool uses_depth = (c->fp->program.Base.InputsRead &
130		      (1 << FRAG_ATTRIB_WPOS)) != 0;
131
132   assert (lookup < IZ_BIT_MAX);
133
134   /* Crazy workaround in the windowizer, which we need to track in
135    * our register allocation and render target writes.  See the "If
136    * statistics are enabled..." paragraph of 11.5.3.2: Early Depth
137    * Test Cases [Pre-DevGT] of the 3D Pipeline - Windower B-Spec.
138    */
139   if (c->key.stats_wm &&
140       (lookup & IZ_PS_KILL_ALPHATEST_BIT) &&
141       wm_iz_table[lookup].mode == P) {
142      kill_stats_promoted_workaround = true;
143   }
144
145   if (lookup & IZ_PS_COMPUTES_DEPTH_BIT)
146      c->computes_depth = 1;
147
148   if (wm_iz_table[lookup].sd_present || uses_depth ||
149       kill_stats_promoted_workaround) {
150      c->source_depth_reg = reg;
151      reg += 2;
152   }
153
154   if (wm_iz_table[lookup].sd_to_rt || kill_stats_promoted_workaround)
155      c->source_depth_to_render_target = 1;
156
157   if (wm_iz_table[lookup].ds_present || c->key.line_aa != AA_NEVER) {
158      c->aa_dest_stencil_reg = reg;
159      c->runtime_check_aads_emit = (!wm_iz_table[lookup].ds_present &&
160				    c->key.line_aa == AA_SOMETIMES);
161      reg++;
162   }
163
164   if (wm_iz_table[lookup].dd_present) {
165      c->dest_depth_reg = reg;
166      reg+=2;
167   }
168
169   c->nr_payload_regs = reg;
170}
171
172