2 * Copyright 2018-2019 Collabora Ltd.
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 * on the rights to use, copy, modify, merge, publish, distribute, sub
8 * license, and/or sell copies of the Software, and to permit persons to whom
9 * the Software is furnished to do so, subject to the following conditions:
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
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 NON-INFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHOR(S) AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
19 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
20 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
21 * USE OR OTHER DEALINGS IN THE SOFTWARE.
24 #include "nir_builder.h"
27 lower_pos_write(nir_builder
*b
, struct nir_instr
*instr
)
29 if (instr
->type
!= nir_instr_type_intrinsic
)
32 nir_intrinsic_instr
*intr
= nir_instr_as_intrinsic(instr
);
33 if (intr
->intrinsic
!= nir_intrinsic_store_deref
)
36 nir_variable
*var
= nir_intrinsic_get_var(intr
, 0);
37 if (var
->data
.mode
!= nir_var_shader_out
||
38 var
->data
.location
!= VARYING_SLOT_POS
)
41 b
->cursor
= nir_before_instr(&intr
->instr
);
43 nir_ssa_def
*pos
= nir_ssa_for_src(b
, intr
->src
[1], 4);
44 nir_ssa_def
*def
= nir_vec4(b
,
45 nir_channel(b
, pos
, 0),
46 nir_channel(b
, pos
, 1),
49 nir_channel(b
, pos
, 2),
50 nir_channel(b
, pos
, 3)),
52 nir_channel(b
, pos
, 3));
53 nir_instr_rewrite_src(&intr
->instr
, intr
->src
+ 1, nir_src_for_ssa(def
));
57 nir_lower_clip_halfz(nir_shader
*shader
)
59 if (shader
->info
.stage
!= MESA_SHADER_VERTEX
)
62 nir_foreach_function(function
, shader
) {
65 nir_builder_init(&b
, function
->impl
);
67 nir_foreach_block(block
, function
->impl
) {
68 nir_foreach_instr_safe(instr
, block
) {
69 lower_pos_write(&b
, instr
);
73 nir_metadata_preserve(function
->impl
, nir_metadata_block_index
|
74 nir_metadata_dominance
);