2 * Copyright © 2016 Intel Corporation
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
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
24 #include "compiler/nir/nir_builder.h"
28 * Prior to Haswell, the hardware can't natively support GL_FIXED or
29 * 2_10_10_10_REV vertex formats. This pass inserts extra shader code
30 * to produce the correct values.
33 struct attr_wa_state
{
36 const uint8_t *wa_flags
;
40 apply_attr_wa_block(nir_block
*block
, struct attr_wa_state
*state
)
42 nir_builder
*b
= &state
->builder
;
44 nir_foreach_instr_safe(instr
, block
) {
45 if (instr
->type
!= nir_instr_type_intrinsic
)
48 nir_intrinsic_instr
*intrin
= nir_instr_as_intrinsic(instr
);
49 if (intrin
->intrinsic
!= nir_intrinsic_load_input
)
52 uint8_t wa_flags
= state
->wa_flags
[intrin
->const_index
[0]];
56 b
->cursor
= nir_after_instr(instr
);
58 nir_ssa_def
*val
= &intrin
->dest
.ssa
;
60 /* Do GL_FIXED rescaling for GLES2.0. Our GL_FIXED attributes
61 * come in as floating point conversions of the integer values.
63 if (wa_flags
& BRW_ATTRIB_WA_COMPONENT_MASK
) {
65 nir_fmul(b
, val
, nir_imm_float(b
, 1.0f
/ 65536.0f
));
66 nir_ssa_def
*comps
[4];
67 for (int i
= 0; i
< val
->num_components
; i
++) {
68 bool rescale
= i
< (wa_flags
& BRW_ATTRIB_WA_COMPONENT_MASK
);
69 comps
[i
] = nir_channel(b
, rescale
? scaled
: val
, i
);
71 val
= nir_vec(b
, comps
, val
->num_components
);
74 /* Do sign recovery for 2101010 formats if required. */
75 if (wa_flags
& BRW_ATTRIB_WA_SIGN
) {
76 /* sign recovery shift: <22, 22, 22, 30> */
77 nir_ssa_def
*shift
= nir_imm_ivec4(b
, 22, 22, 22, 30);
78 val
= nir_ishr(b
, nir_ishl(b
, val
, shift
), shift
);
81 /* Apply BGRA swizzle if required. */
82 if (wa_flags
& BRW_ATTRIB_WA_BGRA
) {
83 val
= nir_swizzle(b
, val
, (unsigned[4]){2,1,0,3}, 4);
86 if (wa_flags
& BRW_ATTRIB_WA_NORMALIZE
) {
87 /* ES 3.0 has different rules for converting signed normalized
88 * fixed-point numbers than desktop GL.
90 if (wa_flags
& BRW_ATTRIB_WA_SIGN
) {
91 /* According to equation 2.2 of the ES 3.0 specification,
92 * signed normalization conversion is done by:
96 * OpenGL 4.2+ uses this equation as well. Since most contexts
97 * promote to the new higher version, and this is what Haswell+
98 * hardware does anyway, we just always use this formula.
100 nir_ssa_def
*es3_normalize_factor
=
101 nir_imm_vec4(b
, 1.0f
/ ((1 << 9) - 1), 1.0f
/ ((1 << 9) - 1),
102 1.0f
/ ((1 << 9) - 1), 1.0f
/ ((1 << 1) - 1));
104 nir_fmul(b
, nir_i2f32(b
, val
), es3_normalize_factor
),
105 nir_imm_float(b
, -1.0f
));
107 /* The following equation is from the OpenGL 3.2 specification:
109 * 2.1 unsigned normalization
112 nir_ssa_def
*normalize_factor
=
113 nir_imm_vec4(b
, 1.0f
/ ((1 << 10) - 1), 1.0f
/ ((1 << 10) - 1),
114 1.0f
/ ((1 << 10) - 1), 1.0f
/ ((1 << 2) - 1));
116 val
= nir_fmul(b
, nir_u2f32(b
, val
), normalize_factor
);
120 if (wa_flags
& BRW_ATTRIB_WA_SCALE
) {
121 val
= (wa_flags
& BRW_ATTRIB_WA_SIGN
) ? nir_i2f32(b
, val
)
125 nir_ssa_def_rewrite_uses_after(&intrin
->dest
.ssa
, nir_src_for_ssa(val
),
127 state
->impl_progress
= true;
134 brw_nir_apply_attribute_workarounds(nir_shader
*shader
,
135 const uint8_t *attrib_wa_flags
)
137 bool progress
= false;
138 struct attr_wa_state state
= {
139 .wa_flags
= attrib_wa_flags
,
142 nir_foreach_function(func
, shader
) {
146 nir_builder_init(&state
.builder
, func
->impl
);
147 state
.impl_progress
= false;
149 nir_foreach_block(block
, func
->impl
) {
150 apply_attr_wa_block(block
, &state
);
153 if (state
.impl_progress
) {
154 nir_metadata_preserve(func
->impl
, nir_metadata_block_index
|
155 nir_metadata_dominance
);