2 * Copyright (C) 2020 Google, Inc.
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:
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 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 FROM,
20 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
25 #include "nir_builder.h"
27 /* Lower mediump outputs to float16, int16, or uint16. */
30 nir_lower_mediump_outputs(nir_shader
*nir
)
32 nir_function_impl
*impl
= nir_shader_get_entrypoint(nir
);
35 /* Get rid of old derefs before we change the types of the variables */
39 nir_builder_init(&b
, impl
);
41 nir_foreach_block_safe (block
, impl
) {
42 nir_foreach_instr_safe (instr
, block
) {
43 if (instr
->type
!= nir_instr_type_intrinsic
)
46 nir_intrinsic_instr
*intr
= nir_instr_as_intrinsic(instr
);
47 if (intr
->intrinsic
!= nir_intrinsic_store_output
)
50 nir_foreach_shader_out_variable(var
, nir
) {
51 if (var
->data
.driver_location
!= nir_intrinsic_base(intr
))
52 continue; /* not found yet */
54 if (var
->data
.precision
!= GLSL_PRECISION_MEDIUM
&&
55 var
->data
.precision
!= GLSL_PRECISION_LOW
)
56 break; /* can't lower */
58 switch (glsl_get_base_type(var
->type
)) {
60 var
->type
= glsl_float16_type(var
->type
);
61 b
.cursor
= nir_before_instr(&intr
->instr
);
62 nir_instr_rewrite_src(&intr
->instr
, &intr
->src
[0],
63 nir_src_for_ssa(nir_f2f16(&b
, intr
->src
[0].ssa
)));
64 nir_intrinsic_set_type(intr
, nir_type_float16
);
68 var
->type
= glsl_int16_type(var
->type
);
69 b
.cursor
= nir_before_instr(&intr
->instr
);
70 nir_instr_rewrite_src(&intr
->instr
, &intr
->src
[0],
71 nir_src_for_ssa(nir_i2i16(&b
, intr
->src
[0].ssa
)));
72 nir_intrinsic_set_type(intr
, nir_type_int16
);
76 var
->type
= glsl_uint16_type(var
->type
);
77 b
.cursor
= nir_before_instr(&intr
->instr
);
78 nir_instr_rewrite_src(&intr
->instr
, &intr
->src
[0],
79 nir_src_for_ssa(nir_u2u16(&b
, intr
->src
[0].ssa
)));
80 nir_intrinsic_set_type(intr
, nir_type_uint16
);