1 /**************************************************************************
3 * Copyright 2010 VMware, Inc.
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sub license, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
17 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
18 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
19 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
20 * USE OR OTHER DEALINGS IN THE SOFTWARE.
22 * The above copyright notice and this permission notice (including the
23 * next paragraph) shall be included in all copies or substantial portions
26 **************************************************************************/
29 #include "u_cpu_detect.h"
30 #include "lp_bld_type.h"
31 #include "lp_bld_arit.h"
32 #include "lp_bld_const.h"
33 #include "lp_bld_swizzle.h"
34 #include "lp_bld_quad.h"
37 static const unsigned char
39 LP_BLD_QUAD_TOP_LEFT
, LP_BLD_QUAD_TOP_LEFT
,
40 LP_BLD_QUAD_BOTTOM_LEFT
, LP_BLD_QUAD_BOTTOM_LEFT
43 static const unsigned char
45 LP_BLD_QUAD_TOP_RIGHT
, LP_BLD_QUAD_TOP_RIGHT
,
46 LP_BLD_QUAD_BOTTOM_RIGHT
, LP_BLD_QUAD_BOTTOM_RIGHT
49 static const unsigned char
51 LP_BLD_QUAD_TOP_LEFT
, LP_BLD_QUAD_TOP_RIGHT
,
52 LP_BLD_QUAD_TOP_LEFT
, LP_BLD_QUAD_TOP_RIGHT
55 static const unsigned char
57 LP_BLD_QUAD_BOTTOM_LEFT
, LP_BLD_QUAD_BOTTOM_RIGHT
,
58 LP_BLD_QUAD_BOTTOM_LEFT
, LP_BLD_QUAD_BOTTOM_RIGHT
63 lp_build_ddx(struct lp_build_context
*bld
,
66 LLVMValueRef a_left
= lp_build_swizzle_aos(bld
, a
, swizzle_left
);
67 LLVMValueRef a_right
= lp_build_swizzle_aos(bld
, a
, swizzle_right
);
68 return lp_build_sub(bld
, a_right
, a_left
);
73 lp_build_ddy(struct lp_build_context
*bld
,
76 LLVMValueRef a_top
= lp_build_swizzle_aos(bld
, a
, swizzle_top
);
77 LLVMValueRef a_bottom
= lp_build_swizzle_aos(bld
, a
, swizzle_bottom
);
78 return lp_build_sub(bld
, a_bottom
, a_top
);
82 * To be able to handle multiple quads at once in texture sampling and
83 * do lod calculations per quad, it is necessary to get the per-quad
84 * derivatives into the lp_build_rho function.
85 * For 8-wide vectors the packed derivative values for 3 coords would
86 * look like this, this scales to a arbitrary (multiple of 4) vector size:
87 * ds1dx ds1dy dt1dx dt1dy ds2dx ds2dy dt2dx dt2dy
88 * dr1dx dr1dy _____ _____ dr2dx dr2dy _____ _____
89 * The second vector will be unused for 1d and 2d textures.
92 lp_build_packed_ddx_ddy_onecoord(struct lp_build_context
*bld
,
95 struct gallivm_state
*gallivm
= bld
->gallivm
;
96 LLVMBuilderRef builder
= gallivm
->builder
;
97 LLVMValueRef vec1
, vec2
;
99 /* same packing as _twocoord, but can use aos swizzle helper */
102 * XXX could make swizzle1 a noop swizzle by using right top/bottom
105 static const unsigned char swizzle1
[] = {
106 LP_BLD_QUAD_TOP_LEFT
, LP_BLD_QUAD_TOP_LEFT
,
107 LP_BLD_SWIZZLE_DONTCARE
, LP_BLD_SWIZZLE_DONTCARE
109 static const unsigned char swizzle2
[] = {
110 LP_BLD_QUAD_TOP_RIGHT
, LP_BLD_QUAD_BOTTOM_LEFT
,
111 LP_BLD_SWIZZLE_DONTCARE
, LP_BLD_SWIZZLE_DONTCARE
114 vec1
= lp_build_swizzle_aos(bld
, a
, swizzle1
);
115 vec2
= lp_build_swizzle_aos(bld
, a
, swizzle2
);
117 if (bld
->type
.floating
)
118 return LLVMBuildFSub(builder
, vec2
, vec1
, "ddxddy");
120 return LLVMBuildSub(builder
, vec2
, vec1
, "ddxddy");
125 lp_build_packed_ddx_ddy_twocoord(struct lp_build_context
*bld
,
126 LLVMValueRef a
, LLVMValueRef b
)
128 struct gallivm_state
*gallivm
= bld
->gallivm
;
129 LLVMBuilderRef builder
= gallivm
->builder
;
130 LLVMValueRef shuffles1
[LP_MAX_VECTOR_LENGTH
/4];
131 LLVMValueRef shuffles2
[LP_MAX_VECTOR_LENGTH
/4];
132 LLVMValueRef vec1
, vec2
;
133 unsigned length
, num_quads
, i
;
135 /* XXX: do hsub version */
136 length
= bld
->type
.length
;
137 num_quads
= length
/ 4;
138 for (i
= 0; i
< num_quads
; i
++) {
140 unsigned s2
= 4 * i
+ length
;
141 shuffles1
[4*i
+ 0] = lp_build_const_int32(gallivm
, LP_BLD_QUAD_TOP_LEFT
+ s1
);
142 shuffles1
[4*i
+ 1] = lp_build_const_int32(gallivm
, LP_BLD_QUAD_TOP_LEFT
+ s1
);
143 shuffles1
[4*i
+ 2] = lp_build_const_int32(gallivm
, LP_BLD_QUAD_TOP_LEFT
+ s2
);
144 shuffles1
[4*i
+ 3] = lp_build_const_int32(gallivm
, LP_BLD_QUAD_TOP_LEFT
+ s2
);
145 shuffles2
[4*i
+ 0] = lp_build_const_int32(gallivm
, LP_BLD_QUAD_TOP_RIGHT
+ s1
);
146 shuffles2
[4*i
+ 1] = lp_build_const_int32(gallivm
, LP_BLD_QUAD_BOTTOM_LEFT
+ s1
);
147 shuffles2
[4*i
+ 2] = lp_build_const_int32(gallivm
, LP_BLD_QUAD_TOP_RIGHT
+ s2
);
148 shuffles2
[4*i
+ 3] = lp_build_const_int32(gallivm
, LP_BLD_QUAD_BOTTOM_LEFT
+ s2
);
150 vec1
= LLVMBuildShuffleVector(builder
, a
, b
,
151 LLVMConstVector(shuffles1
, length
), "");
152 vec2
= LLVMBuildShuffleVector(builder
, a
, b
,
153 LLVMConstVector(shuffles2
, length
), "");
154 if (bld
->type
.floating
)
155 return LLVMBuildFSub(builder
, vec2
, vec1
, "ddxddyddxddy");
157 return LLVMBuildSub(builder
, vec2
, vec1
, "ddxddyddxddy");