1 /**************************************************************************
2 *
3 * Copyright 2010 VMware, Inc.
4 * All Rights Reserved.
5 *
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:
13 *
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.
21 *
22 * The above copyright notice and this permission notice (including the
23 * next paragraph) shall be included in all copies or substantial portions
24 * of the Software.
25 *
26 **************************************************************************/
27
28
29 #include "lp_bld_type.h"
30 #include "lp_bld_arit.h"
31 #include "lp_bld_const.h"
32 #include "lp_bld_swizzle.h"
33 #include "lp_bld_quad.h"
34 #include "lp_bld_pack.h"
35
36
37 static const unsigned char
38 swizzle_left[4] = {
39 LP_BLD_QUAD_TOP_LEFT, LP_BLD_QUAD_TOP_LEFT,
40 LP_BLD_QUAD_BOTTOM_LEFT, LP_BLD_QUAD_BOTTOM_LEFT
41 };
42
43 static const unsigned char
44 swizzle_right[4] = {
45 LP_BLD_QUAD_TOP_RIGHT, LP_BLD_QUAD_TOP_RIGHT,
46 LP_BLD_QUAD_BOTTOM_RIGHT, LP_BLD_QUAD_BOTTOM_RIGHT
47 };
48
49 static const unsigned char
50 swizzle_top[4] = {
51 LP_BLD_QUAD_TOP_LEFT, LP_BLD_QUAD_TOP_RIGHT,
52 LP_BLD_QUAD_TOP_LEFT, LP_BLD_QUAD_TOP_RIGHT
53 };
54
55 static const unsigned char
56 swizzle_bottom[4] = {
57 LP_BLD_QUAD_BOTTOM_LEFT, LP_BLD_QUAD_BOTTOM_RIGHT,
58 LP_BLD_QUAD_BOTTOM_LEFT, LP_BLD_QUAD_BOTTOM_RIGHT
59 };
60
61
62 LLVMValueRef
lp_build_ddx(struct lp_build_context * bld,LLVMValueRef a)63 lp_build_ddx(struct lp_build_context *bld,
64 LLVMValueRef a)
65 {
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);
69 }
70
71
72 LLVMValueRef
lp_build_ddy(struct lp_build_context * bld,LLVMValueRef a)73 lp_build_ddy(struct lp_build_context *bld,
74 LLVMValueRef a)
75 {
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);
79 }
80
81 /*
82 * Helper for building packed ddx/ddy vector for one coord (scalar per quad
83 * values). The vector will look like this (8-wide):
84 * dr1dx _____ -dr1dy _____ dr2dx _____ -dr2dy _____
85 * This only requires one shuffle instead of two for more straightforward packing.
86 */
87 LLVMValueRef
lp_build_packed_ddx_ddy_onecoord(struct lp_build_context * bld,LLVMValueRef a)88 lp_build_packed_ddx_ddy_onecoord(struct lp_build_context *bld,
89 LLVMValueRef a)
90 {
91 struct gallivm_state *gallivm = bld->gallivm;
92 LLVMBuilderRef builder = gallivm->builder;
93 LLVMValueRef vec1, vec2;
94
95 /* use aos swizzle helper */
96
97 static const unsigned char swizzle1[] = { /* no-op swizzle */
98 LP_BLD_QUAD_TOP_LEFT, LP_BLD_SWIZZLE_DONTCARE,
99 LP_BLD_QUAD_BOTTOM_LEFT, LP_BLD_SWIZZLE_DONTCARE
100 };
101 static const unsigned char swizzle2[] = {
102 LP_BLD_QUAD_TOP_RIGHT, LP_BLD_SWIZZLE_DONTCARE,
103 LP_BLD_QUAD_TOP_LEFT, LP_BLD_SWIZZLE_DONTCARE
104 };
105
106 vec1 = lp_build_swizzle_aos(bld, a, swizzle1);
107 vec2 = lp_build_swizzle_aos(bld, a, swizzle2);
108
109 if (bld->type.floating)
110 return LLVMBuildFSub(builder, vec2, vec1, "ddxddy");
111 else
112 return LLVMBuildSub(builder, vec2, vec1, "ddxddy");
113 }
114
115
116 /*
117 * Helper for building packed ddx/ddy vector for one coord (scalar per quad
118 * values). The vector will look like this (8-wide):
119 * ds1dx ds1dy dt1dx dt1dy ds2dx ds2dy dt2dx dt2dy
120 * This only needs 2 (v)shufps.
121 */
122 LLVMValueRef
lp_build_packed_ddx_ddy_twocoord(struct lp_build_context * bld,LLVMValueRef a,LLVMValueRef b)123 lp_build_packed_ddx_ddy_twocoord(struct lp_build_context *bld,
124 LLVMValueRef a, LLVMValueRef b)
125 {
126 struct gallivm_state *gallivm = bld->gallivm;
127 LLVMBuilderRef builder = gallivm->builder;
128 LLVMValueRef shuffles1[LP_MAX_VECTOR_LENGTH/4];
129 LLVMValueRef shuffles2[LP_MAX_VECTOR_LENGTH/4];
130 LLVMValueRef vec1, vec2;
131 unsigned length, num_quads, i;
132
133 /* XXX: do hsub version */
134 length = bld->type.length;
135 num_quads = length / 4;
136 for (i = 0; i < num_quads; i++) {
137 unsigned s1 = 4 * i;
138 unsigned s2 = 4 * i + length;
139 shuffles1[4*i + 0] = lp_build_const_int32(gallivm, LP_BLD_QUAD_TOP_LEFT + s1);
140 shuffles1[4*i + 1] = lp_build_const_int32(gallivm, LP_BLD_QUAD_TOP_LEFT + s1);
141 shuffles1[4*i + 2] = lp_build_const_int32(gallivm, LP_BLD_QUAD_TOP_LEFT + s2);
142 shuffles1[4*i + 3] = lp_build_const_int32(gallivm, LP_BLD_QUAD_TOP_LEFT + s2);
143 shuffles2[4*i + 0] = lp_build_const_int32(gallivm, LP_BLD_QUAD_TOP_RIGHT + s1);
144 shuffles2[4*i + 1] = lp_build_const_int32(gallivm, LP_BLD_QUAD_BOTTOM_LEFT + s1);
145 shuffles2[4*i + 2] = lp_build_const_int32(gallivm, LP_BLD_QUAD_TOP_RIGHT + s2);
146 shuffles2[4*i + 3] = lp_build_const_int32(gallivm, LP_BLD_QUAD_BOTTOM_LEFT + s2);
147 }
148 vec1 = LLVMBuildShuffleVector(builder, a, b,
149 LLVMConstVector(shuffles1, length), "");
150 vec2 = LLVMBuildShuffleVector(builder, a, b,
151 LLVMConstVector(shuffles2, length), "");
152 if (bld->type.floating)
153 return LLVMBuildFSub(builder, vec2, vec1, "ddxddyddxddy");
154 else
155 return LLVMBuildSub(builder, vec2, vec1, "ddxddyddxddy");
156 }
157
158
159 /**
160 * Twiddle from quad format to row format
161 *
162 * src0 src1
163 * ######### ######### #################
164 * # 0 | 1 # # 4 | 5 # # 0 | 1 | 4 | 5 # src0
165 * #---+---# #---+---# -> #################
166 * # 2 | 3 # # 6 | 7 # # 2 | 3 | 6 | 7 # src1
167 * ######### ######### #################
168 *
169 */
170 void
lp_bld_quad_twiddle(struct gallivm_state * gallivm,struct lp_type lp_dst_type,const LLVMValueRef * src,unsigned src_count,LLVMValueRef * dst)171 lp_bld_quad_twiddle(struct gallivm_state *gallivm,
172 struct lp_type lp_dst_type,
173 const LLVMValueRef* src,
174 unsigned src_count,
175 LLVMValueRef* dst)
176 {
177 LLVMBuilderRef builder = gallivm->builder;
178 LLVMTypeRef dst_type_ref;
179 LLVMTypeRef type2_ref;
180 struct lp_type type2;
181 unsigned i;
182
183 assert((src_count % 2) == 0);
184
185 /* Create a type with only 2 elements */
186 type2 = lp_dst_type;
187 type2.width = (lp_dst_type.width * lp_dst_type.length) / 2;
188 type2.length = 2;
189 type2.floating = 0;
190
191 type2_ref = lp_build_vec_type(gallivm, type2);
192 dst_type_ref = lp_build_vec_type(gallivm, lp_dst_type);
193
194 for (i = 0; i < src_count; i += 2) {
195 LLVMValueRef src0, src1;
196
197 src0 = LLVMBuildBitCast(builder, src[i + 0], type2_ref, "");
198 src1 = LLVMBuildBitCast(builder, src[i + 1], type2_ref, "");
199
200 dst[i + 0] = lp_build_interleave2(gallivm, type2, src0, src1, 0);
201 dst[i + 1] = lp_build_interleave2(gallivm, type2, src0, src1, 1);
202
203 dst[i + 0] = LLVMBuildBitCast(builder, dst[i + 0], dst_type_ref, "");
204 dst[i + 1] = LLVMBuildBitCast(builder, dst[i + 1], dst_type_ref, "");
205 }
206 }
207