1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
|
/**************************************************************************
*
* Copyright 2009 VMware, Inc.
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sub license, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portions
* of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
* IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
**************************************************************************/
#include "util/u_format.h"
#include "lp_bld.h"
LLVMValueRef
lp_build_unpack_rgba(LLVMBuilderRef builder,
enum pipe_format format,
LLVMValueRef packed)
{
const struct util_format_description *desc;
LLVMTypeRef type;
unsigned shift = 0;
unsigned i;
desc = util_format_description(format);
/* FIXME: Support more formats */
assert(desc->layout == UTIL_FORMAT_LAYOUT_ARITH);
assert(desc->block.width == 1);
assert(desc->block.height == 1);
assert(desc->block.bits <= 32);
type = LLVMIntType(desc->block.bits);
/* Do the intermediate integer computations with 32bit integers since it
* matches floating point size */
if (desc->block.bits < 32)
packed = LLVMBuildZExt(builder, packed, LLVMInt32Type(), "");
/* Broadcast the packed value to all four channels */
packed = LLVMBuildInsertElement(builder,
LLVMGetUndef(LLVMVectorType(LLVMInt32Type(), 4)),
packed,
LLVMConstNull(LLVMInt32Type()),
"");
packed = LLVMBuildShuffleVector(builder,
packed,
LLVMGetUndef(LLVMVectorType(LLVMInt32Type(), 4)),
LLVMConstNull(LLVMVectorType(LLVMInt32Type(), 4)),
"");
LLVMValueRef shifted, casted, scaled, masked, swizzled;
LLVMValueRef shifts[4];
LLVMValueRef masks[4];
LLVMValueRef scales[4];
bool normalized = FALSE;
int empty_channel = -1;
/* Initialize vector constants */
for (i = 0; i < 4; ++i) {
unsigned bits = desc->channel[i].size;
if (desc->channel[i].type == UTIL_FORMAT_TYPE_VOID) {
shifts[i] = LLVMGetUndef(LLVMInt32Type());
masks[i] = LLVMConstNull(LLVMInt32Type());
scales[i] = LLVMConstNull(LLVMFloatType());
empty_channel = i;
}
else {
unsigned mask = (1 << bits) - 1;
assert(desc->channel[i].type == UTIL_FORMAT_TYPE_UNSIGNED);
assert(bits < 32);
shifts[i] = LLVMConstInt(LLVMInt32Type(), shift, 0);
masks[i] = LLVMConstInt(LLVMInt32Type(), mask, 0);
if (desc->channel[i].normalized) {
scales[i] = LLVMConstReal(LLVMFloatType(), 1.0/mask);
normalized = TRUE;
}
else
scales[i] = LLVMConstReal(LLVMFloatType(), 1.0);
}
shift += bits;
}
shifted = LLVMBuildLShr(builder, packed, LLVMConstVector(shifts, 4), "");
masked = LLVMBuildAnd(builder, shifted, LLVMConstVector(masks, 4), "");
// UIToFP can't be expressed in SSE2
casted = LLVMBuildSIToFP(builder, masked, LLVMVectorType(LLVMFloatType(), 4), "");
if (normalized)
scaled = LLVMBuildMul(builder, casted, LLVMConstVector(scales, 4), "");
else
scaled = casted;
LLVMValueRef swizzles[4];
LLVMValueRef aux[4];
for (i = 0; i < 4; ++i)
aux[i] = LLVMGetUndef(LLVMFloatType());
for (i = 0; i < 4; ++i) {
enum util_format_swizzle swizzle = desc->swizzle[i];
switch (swizzle) {
case UTIL_FORMAT_SWIZZLE_X:
case UTIL_FORMAT_SWIZZLE_Y:
case UTIL_FORMAT_SWIZZLE_Z:
case UTIL_FORMAT_SWIZZLE_W:
swizzles[i] = LLVMConstInt(LLVMInt32Type(), swizzle, 0);
break;
case UTIL_FORMAT_SWIZZLE_0:
assert(empty_channel >= 0);
swizzles[i] = LLVMConstInt(LLVMInt32Type(), empty_channel, 0);
break;
case UTIL_FORMAT_SWIZZLE_1:
swizzles[i] = LLVMConstInt(LLVMInt32Type(), 4, 0);
aux[0] = LLVMConstReal(LLVMFloatType(), 1.0);
break;
case UTIL_FORMAT_SWIZZLE_NONE:
swizzles[i] = LLVMGetUndef(LLVMFloatType());
assert(0);
break;
}
}
swizzled = LLVMBuildShuffleVector(builder, scaled, LLVMConstVector(aux, 4), LLVMConstVector(swizzles, 4), "");
return swizzled;
}
|
