1 /*
2 * Copyright © 2017 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
24 #include "compiler/nir/nir_builder.h"
25
26 static inline nir_ssa_def *
blorp_nir_frag_coord(nir_builder * b)27 blorp_nir_frag_coord(nir_builder *b)
28 {
29 nir_variable *frag_coord =
30 nir_variable_create(b->shader, nir_var_shader_in,
31 glsl_vec4_type(), "gl_FragCoord");
32
33 frag_coord->data.location = VARYING_SLOT_POS;
34 frag_coord->data.origin_upper_left = true;
35
36 return nir_load_var(b, frag_coord);
37 }
38
39 static inline nir_ssa_def *
blorp_nir_txf_ms_mcs(nir_builder * b,nir_ssa_def * xy_pos,nir_ssa_def * layer)40 blorp_nir_txf_ms_mcs(nir_builder *b, nir_ssa_def *xy_pos, nir_ssa_def *layer)
41 {
42 nir_tex_instr *tex = nir_tex_instr_create(b->shader, 1);
43 tex->op = nir_texop_txf_ms_mcs;
44 tex->sampler_dim = GLSL_SAMPLER_DIM_MS;
45 tex->dest_type = nir_type_int;
46
47 nir_ssa_def *coord;
48 if (layer) {
49 tex->is_array = true;
50 tex->coord_components = 3;
51 coord = nir_vec3(b, nir_channel(b, xy_pos, 0),
52 nir_channel(b, xy_pos, 1),
53 layer);
54 } else {
55 tex->is_array = false;
56 tex->coord_components = 2;
57 coord = nir_channels(b, xy_pos, 0x3);
58 }
59 tex->src[0].src_type = nir_tex_src_coord;
60 tex->src[0].src = nir_src_for_ssa(coord);
61
62 /* Blorp only has one texture and it's bound at unit 0 */
63 tex->texture_index = 0;
64 tex->sampler_index = 0;
65
66 nir_ssa_dest_init(&tex->instr, &tex->dest, 4, 32, NULL);
67 nir_builder_instr_insert(b, &tex->instr);
68
69 return &tex->dest.ssa;
70 }
71
72 static inline nir_ssa_def *
blorp_nir_mcs_is_clear_color(nir_builder * b,nir_ssa_def * mcs,uint32_t samples)73 blorp_nir_mcs_is_clear_color(nir_builder *b,
74 nir_ssa_def *mcs,
75 uint32_t samples)
76 {
77 switch (samples) {
78 case 2:
79 /* Empirical evidence suggests that the value returned from the
80 * sampler is not always 0x3 for clear color so we need to mask it.
81 */
82 return nir_ieq(b, nir_iand(b, nir_channel(b, mcs, 0),
83 nir_imm_int(b, 0x3)),
84 nir_imm_int(b, 0x3));
85
86 case 4:
87 return nir_ieq(b, nir_channel(b, mcs, 0), nir_imm_int(b, 0xff));
88
89 case 8:
90 return nir_ieq(b, nir_channel(b, mcs, 0), nir_imm_int(b, ~0));
91
92 case 16:
93 /* For 16x MSAA, the MCS is actually an ivec2 */
94 return nir_iand(b, nir_ieq(b, nir_channel(b, mcs, 0),
95 nir_imm_int(b, ~0)),
96 nir_ieq(b, nir_channel(b, mcs, 1),
97 nir_imm_int(b, ~0)));
98
99 default:
100 unreachable("Invalid sample count");
101 }
102 }
103