1 /**************************************************************************
2 *
3 * Copyright 2012 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 above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
16 * of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
21 * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
22 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
23 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
24 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
25 *
26 **************************************************************************/
27
28 #include "lp_bld_const.h"
29 #include "lp_bld_struct.h"
30 #include "lp_bld_format.h"
31 #include "lp_bld_debug.h"
32 #include "lp_bld_type.h"
33 #include "lp_bld_conv.h"
34 #include "lp_bld_pack.h"
35
36 #include "util/u_memory.h"
37 #include "util/u_format.h"
38 #include "pipe/p_state.h"
39
40 /**
41 * @brief lp_build_fetch_rgba_aos_array
42 *
43 * \param format_desc describes format of the image we're fetching from
44 * \param dst_type output type
45 * \param base_ptr address of the pixel block (or the texel if uncompressed)
46 * \param offset ptr offset
47 */
48 LLVMValueRef
lp_build_fetch_rgba_aos_array(struct gallivm_state * gallivm,const struct util_format_description * format_desc,struct lp_type dst_type,LLVMValueRef base_ptr,LLVMValueRef offset)49 lp_build_fetch_rgba_aos_array(struct gallivm_state *gallivm,
50 const struct util_format_description *format_desc,
51 struct lp_type dst_type,
52 LLVMValueRef base_ptr,
53 LLVMValueRef offset)
54 {
55 struct lp_build_context bld;
56 LLVMBuilderRef builder = gallivm->builder;
57 LLVMTypeRef src_vec_type;
58 LLVMValueRef ptr, res = NULL;
59 struct lp_type src_type;
60
61 memset(&src_type, 0, sizeof src_type);
62 src_type.floating = format_desc->channel[0].type == UTIL_FORMAT_TYPE_FLOAT;
63 src_type.fixed = format_desc->channel[0].type == UTIL_FORMAT_TYPE_FIXED;
64 src_type.sign = format_desc->channel[0].type != UTIL_FORMAT_TYPE_UNSIGNED;
65 src_type.norm = format_desc->channel[0].normalized;
66 src_type.width = format_desc->channel[0].size;
67 src_type.length = format_desc->nr_channels;
68
69 assert(src_type.length <= dst_type.length);
70
71 src_vec_type = lp_build_vec_type(gallivm, src_type);
72
73 /* Read whole vector from memory, unaligned */
74 if (!res) {
75 ptr = LLVMBuildGEP(builder, base_ptr, &offset, 1, "");
76 ptr = LLVMBuildPointerCast(builder, ptr, LLVMPointerType(src_vec_type, 0), "");
77 res = LLVMBuildLoad(builder, ptr, "");
78 lp_set_load_alignment(res, src_type.width / 8);
79 }
80
81 /* Truncate doubles to float */
82 if (src_type.floating && src_type.width == 64) {
83 src_type.width = 32;
84 src_vec_type = lp_build_vec_type(gallivm, src_type);
85
86 res = LLVMBuildFPTrunc(builder, res, src_vec_type, "");
87 }
88
89 /* Expand to correct length */
90 if (src_type.length < dst_type.length) {
91 res = lp_build_pad_vector(gallivm, res, src_type, dst_type.length);
92 src_type.length = dst_type.length;
93 }
94
95 /* Convert to correct format */
96 lp_build_conv(gallivm, src_type, dst_type, &res, 1, &res, 1);
97
98 /* Swizzle it */
99 lp_build_context_init(&bld, gallivm, dst_type);
100 return lp_build_format_swizzle_aos(format_desc, &bld, res);
101 }
102