1 /*
2  Copyright (C) Intel Corp.  2006.  All Rights Reserved.
3  Intel funded Tungsten Graphics 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 <keithw@vmware.com>
30   */
31 
32 
33 #include "brw_fs.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 
45 static const 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  */
123 void fs_visitor::setup_fs_payload_gen4()
124 {
125    assert(stage == MESA_SHADER_FRAGMENT);
126    struct brw_wm_prog_data *prog_data = brw_wm_prog_data(this->prog_data);
127    brw_wm_prog_key *key = (brw_wm_prog_key*) this->key;
128    GLuint reg = 2;
129    bool kill_stats_promoted_workaround = false;
130    int lookup = key->iz_lookup;
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 (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    prog_data->uses_src_depth =
146       (nir->info->inputs_read & (1 << VARYING_SLOT_POS)) != 0;
147    if (wm_iz_table[lookup].sd_present || prog_data->uses_src_depth ||
148        kill_stats_promoted_workaround) {
149       payload.source_depth_reg = reg;
150       reg += 2;
151    }
152 
153    if (wm_iz_table[lookup].sd_to_rt || kill_stats_promoted_workaround)
154       source_depth_to_render_target = true;
155 
156    if (wm_iz_table[lookup].ds_present || key->line_aa != AA_NEVER) {
157       payload.aa_dest_stencil_reg = reg;
158       runtime_check_aads_emit =
159          !wm_iz_table[lookup].ds_present && key->line_aa == AA_SOMETIMES;
160       reg++;
161    }
162 
163    if (wm_iz_table[lookup].dd_present) {
164       payload.dest_depth_reg = reg;
165       reg+=2;
166    }
167 
168    payload.num_regs = reg;
169 }
170 
171